本發明涉及(ji)LED恒(heng)流驅動技術領域，尤其(qi)涉及(ji)一種LED恒(heng)流驅動系統及(ji)其(qi)恒(heng)流控制電路。

背景技術：

現在(zai)，能(neng)源問(wen)題(ti)與環保成(cheng)問(wen)題(ti)成(cheng)為人(ren)類面對(dui)的兩大主(zhu)要問(wen)題(ti)。LED具有高效、低耗、環保、體積(ji)小以及壽命(ming)長等諸多優點(dian)，在(zai)照(zhao)明領(ling)域日益受到重視。因為LED受其光學和電學特性的限制，必須要輔以專用恒流驅(qu)動電路才(cai)可正常工作(zuo)。

目前，在(zai)集成電(dian)路系(xi)統中(zhong)，LED驅動(dong)系(xi)統的調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)(fang)(fang)式(shi)有(you)PWM數(shu)字(zi)調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)(fang)(fang)式(shi)、純模擬電(dian)壓(ya)調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)(fang)(fang)式(shi)以及同(tong)時包括(kuo)PWM數(shu)字(zi)調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)和(he)(he)模擬調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)的方(fang)(fang)(fang)式(shi)。但是(shi)，同(tong)時包括(kuo)PWM數(shu)字(zi)調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)和(he)(he)模擬調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)的模式(shi)中(zhong)，PWM數(shu)字(zi)調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)和(he)(he)模擬調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)是(shi)獨(du)立工(gong)作模式(shi)。現有(you)調(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)(fang)(fang)式(shi)存在(zai)以下缺點：

1、調(diao)光(guang)(guang)方(fang)(fang)式(shi)單一(yi)，PWM數字調(diao)光(guang)(guang)方(fang)(fang)式(shi)和(he)模擬調(diao)光(guang)(guang)方(fang)(fang)式(shi)，控制模式(shi)只能選(xuan)擇其(qi)一(yi)，有(you)一(yi)定的局限性；

2、PWM調(diao)光方式只能(neng)調(diao)節(jie)輸出信號(hao)的頻(pin)率或占空比(bi)，雖然實現比(bi)較(jiao)簡單，但(dan)是受頻(pin)率限(xian)制，通(tong)常(chang)頻(pin)率過高或過低(di)時調(diao)光效(xiao)果(guo)較(jiao)差，線性度較(jiao)差；

3、模擬(ni)調(diao)(diao)光方式受參考電(dian)壓影響大，受溫度、工藝等(deng)因素(su)對參考電(dian)壓的影響，調(diao)(diao)光精度低(di)。

技術實現要素：

本發(fa)明(ming)提供一種LED恒流驅動系統及(ji)其恒流控制(zhi)電路(lu)，調節范圍更廣，調光精度高。

本(ben)發明采(cai)用以下技術方案：

第一方面(mian)，本發明提供(gong)一種(zhong)LED恒流驅動系(xi)統(tong)的恒流控制電路(lu)，包(bao)括(kuo)：

電(dian)(dian)(dian)(dian)壓(ya)(ya)控(kong)制電(dian)(dian)(dian)(dian)路(lu)，用(yong)于根據(ju)PWM控(kong)制信號(hao)和(he)(he)時鐘信號(hao)的控(kong)制，在第(di)一(yi)參(can)考電(dian)(dian)(dian)(dian)壓(ya)(ya)和(he)(he)第(di)二參(can)考電(dian)(dian)(dian)(dian)壓(ya)(ya)及負(fu)載(zai)采(cai)樣反饋(kui)(kui)電(dian)(dian)(dian)(dian)壓(ya)(ya)中選擇出參(can)考電(dian)(dian)(dian)(dian)壓(ya)(ya)和(he)(he)反饋(kui)(kui)電(dian)(dian)(dian)(dian)壓(ya)(ya)，將(jiang)所述(shu)參(can)考電(dian)(dian)(dian)(dian)壓(ya)(ya)和(he)(he)反饋(kui)(kui)電(dian)(dian)(dian)(dian)壓(ya)(ya)進行調制輸出調節電(dian)(dian)(dian)(dian)壓(ya)(ya)信號(hao)；

驅(qu)動信(xin)(xin)(xin)號(hao)(hao)(hao)生(sheng)成(cheng)電(dian)(dian)路(lu)，用(yong)于(yu)根據所(suo)(suo)述調節電(dian)(dian)壓信(xin)(xin)(xin)號(hao)(hao)(hao)和固定頻率的(de)(de)鋸(ju)齒(chi)波信(xin)(xin)(xin)號(hao)(hao)(hao)進(jin)行比較得到占空比變化的(de)(de)驅(qu)動信(xin)(xin)(xin)號(hao)(hao)(hao)，通過所(suo)(suo)述驅(qu)動信(xin)(xin)(xin)號(hao)(hao)(hao)來(lai)控(kong)制(zhi)負載(zai)的(de)(de)電(dian)(dian)壓，使(shi)負載(zai)的(de)(de)電(dian)(dian)流保(bao)持恒(heng)定。

示(shi)例性(xing)地，所述電(dian)壓控制(zhi)電(dian)路包括：

電(dian)(dian)壓選擇電(dian)(dian)路，用于根(gen)據PWM控制(zhi)信號(hao)和(he)(he)時鐘信號(hao)的控制(zhi)，在第一參(can)(can)考電(dian)(dian)壓和(he)(he)第二(er)參(can)(can)考電(dian)(dian)壓及負載采樣(yang)反饋(kui)(kui)電(dian)(dian)壓中選擇出參(can)(can)考電(dian)(dian)壓和(he)(he)反饋(kui)(kui)電(dian)(dian)壓；

調(diao)光控(kong)制(zhi)電路，用于根據(ju)PWM控(kong)制(zhi)信(xin)(xin)號和時鐘信(xin)(xin)號的控(kong)制(zhi)，對(dui)所述參考電壓(ya)和反饋(kui)電壓(ya)進行調(diao)制(zhi)，輸(shu)出調(diao)節電壓(ya)信(xin)(xin)號。

進一步地，所(suo)述(shu)電壓控制電路(lu)還包括低(di)通濾(lv)波器(qi)，所(suo)述(shu)低(di)通濾(lv)波器(qi)連(lian)接于(yu)所(suo)述(shu)調光控制電路(lu)的輸出側。

示例(li)性地(di)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)電(dian)(dian)壓(ya)選擇電(dian)(dian)路包(bao)括第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)傳輸(shu)(shu)(shu)門(men)、第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)傳輸(shu)(shu)(shu)門(men)、第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)、第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)、第(di)(di)(di)(di)(di)(di)(di)(di)三(san)MOS管(guan)(guan)(guan)(guan)(guan)和(he)(he)第(di)(di)(di)(di)(di)(di)(di)(di)四(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)輸(shu)(shu)(shu)出(chu)(chu)端(duan)(duan)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)輸(shu)(shu)(shu)出(chu)(chu)端(duan)(duan)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)輸(shu)(shu)(shu)入(ru)端(duan)(duan)連(lian)(lian)(lian)(lian)接(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)參考電(dian)(dian)壓(ya)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)控制(zhi)(zhi)端(duan)(duan)連(lian)(lian)(lian)(lian)接(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)PWM控制(zhi)(zhi)信(xin)號(hao)(hao)(hao)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)輸(shu)(shu)(shu)入(ru)端(duan)(duan)連(lian)(lian)(lian)(lian)接(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)參考電(dian)(dian)壓(ya)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)控制(zhi)(zhi)端(duan)(duan)連(lian)(lian)(lian)(lian)接(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)PWM控制(zhi)(zhi)信(xin)號(hao)(hao)(hao)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)輸(shu)(shu)(shu)出(chu)(chu)端(duan)(duan)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)傳輸(shu)(shu)(shu)門(men)的(de)(de)(de)輸(shu)(shu)(shu)出(chu)(chu)端(duan)(duan)的(de)(de)(de)連(lian)(lian)(lian)(lian)接(jie)(jie)點(dian)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)和(he)(he)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)的(de)(de)(de)連(lian)(lian)(lian)(lian)接(jie)(jie)點(dian)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)時(shi)(shi)(shi)(shi)鐘(zhong)信(xin)號(hao)(hao)(hao)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)三(san)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)三(san)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)(ji)與(yu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)時(shi)(shi)(shi)(shi)鐘(zhong)信(xin)號(hao)(hao)(hao)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)三(san)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)四(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)四(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)時(shi)(shi)(shi)(shi)鐘(zhong)信(xin)號(hao)(hao)(hao)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)四(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)柵(zha)(zha)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)于第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)時(shi)(shi)(shi)(shi)鐘(zhong)信(xin)號(hao)(hao)(hao)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)三(san)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)四(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)的(de)(de)(de)連(lian)(lian)(lian)(lian)接(jie)(jie)點(dian)與(yu)負載采樣(yang)反饋電(dian)(dian)壓(ya)提(ti)供端(duan)(duan)連(lian)(lian)(lian)(lian)接(jie)(jie)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)三(san)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)點(dian)引出(chu)(chu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)電(dian)(dian)壓(ya)輸(shu)(shu)(shu)出(chu)(chu)端(duan)(duan)，所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)四(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)與(yu)所(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)(lou)極(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)接(jie)(jie)點(dian)引出(chu)(chu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)電(dian)(dian)壓(ya)輸(shu)(shu)(shu)出(chu)(chu)端(duan)(duan)。

示(shi)例性地(di)，所(suo)(suo)(suo)述(shu)(shu)調(diao)光控制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)包括(kuo)(kuo)偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)、差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)、共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)、開關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)和尾(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)；所(suo)(suo)(suo)述(shu)(shu)偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)包括(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)、第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)和第(di)(di)(di)(di)(di)(di)(di)(di)三偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)；所(suo)(suo)(suo)述(shu)(shu)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)包括(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)和第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)；所(suo)(suo)(suo)述(shu)(shu)開關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)包括(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)開關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)和第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)開關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)，所(suo)(suo)(suo)述(shu)(shu)尾(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)包括(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)尾(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)和第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)尾(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)；所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)一(yi)(yi)(yi)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)提供(gong)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，另一(yi)(yi)(yi)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)輸(shu)(shu)(shu)(shu)(shu)出端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)輸(shu)(shu)(shu)(shu)(shu)出端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)輸(shu)(shu)(shu)(shu)(shu)出端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)尾(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)輸(shu)(shu)(shu)(shu)(shu)出端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)尾(wei)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)源(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)一(yi)(yi)(yi)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)于所(suo)(suo)(suo)述(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)提供(gong)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)，另一(yi)(yi)(yi)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)三連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)三偏置(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)一(yi)(yi)(yi)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)于所(suo)(suo)(suo)述(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)提供(gong)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)，另一(yi)(yi)(yi)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)(yi)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)，所(suo)(suo)(suo)述(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)共(gong)柵(zha)(zha)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)三連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)與(yu)(yu)(yu)所(suo)(suo)(suo)述(shu)(shu)差(cha)(cha)分(fen)(fen)(fen)(fen)輸(shu)(shu)(shu)(shu)(shu)入(ru)(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)的(de)(de)第(di)(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)(er)(er)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)端(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)(duan)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)述(shu)(shu)開關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)(lu)與(yu)(yu)(yu)時鐘信號連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)(jie)。

具體地(di)，所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)流(liu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)五(wu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)六(liu)(liu)(liu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)，所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)流(liu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)七(qi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)八MOS管(guan)(guan)(guan)(guan)(guan)(guan)，所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)三偏置(zhi)電(dian)(dian)(dian)(dian)(dian)流(liu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)九(jiu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)差分輸入電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)共(gong)柵(zha)(zha)(zha)(zha)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)三MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)共(gong)柵(zha)(zha)(zha)(zha)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)四(si)(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)開關電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)五(wu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)六(liu)(liu)(liu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)開關電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)七(qi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)八MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)尾(wei)電(dian)(dian)(dian)(dian)(dian)流(liu)源(yuan)(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)九(jiu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)尾(wei)電(dian)(dian)(dian)(dian)(dian)流(liu)源(yuan)(yuan)(yuan)(yuan)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包(bao)(bao)(bao)(bao)(bao)(bao)(bao)括(kuo)(kuo)(kuo)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)五(wu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)提供端(duan)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)六(liu)(liu)(liu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)六(liu)(liu)(liu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)九(jiu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)電(dian)(dian)(dian)(dian)(dian)壓輸出(chu)端(duan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)九(jiu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)接(jie)(jie)(jie)(jie)(jie)(jie)地(di)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)四(si)(si)(si)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)電(dian)(dian)(dian)(dian)(dian)壓輸出(chu)端(duan)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)接(jie)(jie)(jie)(jie)(jie)(jie)地(di)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)四(si)(si)(si)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)七(qi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)提供端(duan)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)八MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)八MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)三MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)三MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)五(wu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)六(liu)(liu)(liu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)第(di)(di)(di)(di)(di)(di)(di)三偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)五(wu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)時(shi)(shi)鐘信(xin)號(hao)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)六(liu)(liu)(liu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)時(shi)(shi)鐘信(xin)號(hao)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)九(jiu)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)(yuan)提供端(duan)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)四(si)(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)四(si)(si)(si)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)七(qi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)和(he)(he)(he)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)八MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)三偏置(zhi)電(dian)(dian)(dian)(dian)(dian)壓連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)七(qi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)一(yi)(yi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)二(er)(er)(er)(er)時(shi)(shi)鐘信(xin)號(hao)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)八MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)源(yuan)(yuan)(yuan)(yuan)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)與(yu)(yu)(yu)(yu)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)二(er)(er)(er)(er)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)，其(qi)(qi)(qi)(qi)(qi)(qi)(qi)柵(zha)(zha)(zha)(zha)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)連(lian)(lian)(lian)(lian)(lian)(lian)(lian)接(jie)(jie)(jie)(jie)(jie)(jie)所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)一(yi)(yi)時(shi)(shi)鐘信(xin)號(hao)；所(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)(suo)述(shu)(shu)(shu)(shu)(shu)(shu)(shu)第(di)(di)(di)(di)(di)(di)(di)十(shi)(shi)(shi)(shi)(shi)MOS管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)漏(lou)(lou)極(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)(ji)引出(chu)調節電(dian)(dian)(dian)(dian)(dian)壓信(xin)號(hao)輸出(chu)端(duan)。

示例(li)性地，所述驅動信號生(sheng)成電路(lu)包括振蕩器電路(lu)、斜坡(po)補償電路(lu)和(he)PWM比較電路(lu)，

所述振蕩器電路，用(yong)于為(wei)LED恒流驅動系統提供工(gong)作頻(pin)(pin)率(lv)，并為(wei)所述斜坡補償電路提供固定頻(pin)(pin)率(lv)的鋸(ju)齒波；

所述斜坡補(bu)償電路(lu)，用于將(jiang)LED恒流驅動系統(tong)的電感電流采樣信號和所述振蕩器電路(lu)輸(shu)出的鋸齒(chi)波進行疊加；

所述(shu)PWM比(bi)較電路(lu)，用于將所述(shu)電壓(ya)控制電路(lu)輸(shu)出的所述(shu)調節電壓(ya)信(xin)號(hao)同經過所述(shu)斜坡(po)補償電路(lu)輸(shu)出的信(xin)號(hao)進行(xing)比(bi)較，輸(shu)出占空比(bi)可(ke)變(bian)的方波信(xin)號(hao)來控制負(fu)載的電壓(ya)，使負(fu)載的電流保持恒定。

進一步地，所述恒(heng)流控制電(dian)路還包括：

參考電(dian)源(yuan)電(dian)路(lu)，用于為LED恒流驅動系(xi)統提(ti)供電(dian)源(yuan)，并為所(suo)述電(dian)壓(ya)選擇電(dian)路(lu)提(ti)供所(suo)述第一參考電(dian)壓(ya)和(he)所(suo)述第二參考電(dian)壓(ya)；

驅(qu)動電(dian)路，用于將所述PWM比(bi)較電(dian)路輸出的方波(bo)信號進行放大。

第二(er)方面，本(ben)發(fa)明提(ti)供一種LED恒流驅動系(xi)統，包(bao)括上述所述的恒流控制電路。

進一(yi)步地，還包括升壓(ya)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)，所(suo)(suo)述(shu)(shu)(shu)升壓(ya)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)包括第二(er)(er)十(shi)一(yi)MOS管(guan)、電(dian)(dian)(dian)(dian)(dian)(dian)感、續(xu)流(liu)(liu)二(er)(er)極(ji)管(guan)和充電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)容，所(suo)(suo)述(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)感一(yi)端(duan)連(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)(dian)源VIN，另一(yi)端(duan)連(lian)接(jie)所(suo)(suo)述(shu)(shu)(shu)續(xu)流(liu)(liu)二(er)(er)極(ji)管(guan)的(de)(de)(de)正(zheng)(zheng)極(ji)，所(suo)(suo)述(shu)(shu)(shu)續(xu)流(liu)(liu)二(er)(er)極(ji)管(guan)的(de)(de)(de)負(fu)(fu)極(ji)連(lian)接(jie)負(fu)(fu)載(zai)的(de)(de)(de)輸入端(duan)；所(suo)(suo)述(shu)(shu)(shu)第二(er)(er)十(shi)一(yi)MOS管(guan)的(de)(de)(de)漏(lou)極(ji)與所(suo)(suo)述(shu)(shu)(shu)續(xu)流(liu)(liu)二(er)(er)極(ji)管(guan)的(de)(de)(de)正(zheng)(zheng)極(ji)連(lian)接(jie)，其源極(ji)通(tong)過第一(yi)電(dian)(dian)(dian)(dian)(dian)(dian)阻接(jie)地，其柵極(ji)與所(suo)(suo)述(shu)(shu)(shu)恒流(liu)(liu)控制電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)的(de)(de)(de)輸出(chu)(chu)端(duan)連(lian)接(jie)；所(suo)(suo)述(shu)(shu)(shu)充電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)容一(yi)端(duan)與所(suo)(suo)述(shu)(shu)(shu)續(xu)流(liu)(liu)二(er)(er)極(ji)管(guan)的(de)(de)(de)負(fu)(fu)極(ji)連(lian)接(jie)，另一(yi)端(duan)接(jie)地；負(fu)(fu)載(zai)的(de)(de)(de)輸出(chu)(chu)端(duan)通(tong)過第二(er)(er)電(dian)(dian)(dian)(dian)(dian)(dian)阻接(jie)地所(suo)(suo)述(shu)(shu)(shu)恒流(liu)(liu)控制電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)通(tong)過負(fu)(fu)載(zai)的(de)(de)(de)輸出(chu)(chu)端(duan)采集負(fu)(fu)載(zai)采樣(yang)反饋(kui)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)。

本發明提供的技(ji)術方(fang)案(an)帶來如(ru)下有益(yi)效果：

電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)控(kong)制(zhi)(zhi)(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)根(gen)據PWM控(kong)制(zhi)(zhi)(zhi)信號(hao)和時鐘信號(hao)的控(kong)制(zhi)(zhi)(zhi)，在(zai)第(di)一參(can)考電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)和第(di)二(er)參(can)考電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)及負(fu)(fu)(fu)載采(cai)(cai)樣(yang)反(fan)(fan)饋(kui)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)中選擇出參(can)考電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)和反(fan)(fan)饋(kui)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，將所(suo)述參(can)考電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)和反(fan)(fan)饋(kui)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)進行調(diao)(diao)制(zhi)(zhi)(zhi)輸出調(diao)(diao)節電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)信號(hao)，驅(qu)(qu)動(dong)信號(hao)生成電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)根(gen)據所(suo)述調(diao)(diao)節電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)信號(hao)和固定(ding)頻(pin)率(lv)的鋸齒波(bo)信號(hao)進行比(bi)較(jiao)得(de)到(dao)占(zhan)空比(bi)變(bian)化的驅(qu)(qu)動(dong)信號(hao)，通過(guo)所(suo)述驅(qu)(qu)動(dong)信號(hao)來控(kong)制(zhi)(zhi)(zhi)負(fu)(fu)(fu)載的電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，使負(fu)(fu)(fu)載的電(dian)(dian)(dian)(dian)(dian)(dian)流保(bao)持(chi)恒定(ding)，克(ke)服了(le)傳統PWM調(diao)(diao)光(guang)(guang)受頻(pin)率(lv)限制(zhi)(zhi)(zhi)的問題(ti)，也解(jie)決了(le)模擬(ni)調(diao)(diao)光(guang)(guang)精度低的問題(ti)，本發明負(fu)(fu)(fu)載采(cai)(cai)樣(yang)反(fan)(fan)饋(kui)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為直流電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)信號(hao)，外(wai)部PWM調(diao)(diao)光(guang)(guang)信號(hao)的變(bian)化直接體現為負(fu)(fu)(fu)載采(cai)(cai)樣(yang)反(fan)(fan)饋(kui)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)值的變(bian)化，不(bu)受頻(pin)率(lv)限制(zhi)(zhi)(zhi)，調(diao)(diao)節范圍更廣(guang)，調(diao)(diao)光(guang)(guang)精度高。

附圖說明

為(wei)了(le)更清楚地(di)說明本(ben)(ben)(ben)發(fa)明實(shi)(shi)施例中的技術(shu)方案(an)，下面將(jiang)對本(ben)(ben)(ben)發(fa)明實(shi)(shi)施例描(miao)(miao)述中所需要使用的附圖(tu)作簡單的介(jie)紹，顯而易見地(di)，下面描(miao)(miao)述中的附圖(tu)僅(jin)僅(jin)是本(ben)(ben)(ben)發(fa)明的一(yi)些實(shi)(shi)施例，對于本(ben)(ben)(ben)領域普通技術(shu)人員(yuan)來講，在不付出創(chuang)造性勞動的前提下，還(huan)可以根據本(ben)(ben)(ben)發(fa)明實(shi)(shi)施例的內容和這些附圖(tu)獲得(de)其他的附圖(tu)。

圖1是本發明(ming)提供的LED恒(heng)流驅動系統的恒(heng)流控制(zhi)電路(lu)的結(jie)構方框圖。

圖2是本發明提供的電壓選擇電路的電路原理圖。

圖3是本(ben)發明(ming)提供的調光控制電路(lu)(lu)的電路(lu)(lu)原理(li)圖。

圖4是本發明提(ti)供的調(diao)光控制(zhi)電路在PWM調(diao)光模式(shi)時的電路示意(yi)圖。

圖5是本發(fa)明提(ti)供的調(diao)光(guang)控制(zhi)電路(lu)在無PWM調(diao)光(guang)模式時的電路(lu)示意(yi)圖。

圖(tu)6是本發明(ming)提供的LED恒流驅動系(xi)統的結構(gou)方塊圖(tu)。

具體實施方式

為使本(ben)發(fa)明解決的技術(shu)問題、采用的技術(shu)方案和達到的技術(shu)效果更加清楚，下面將結合附(fu)圖對本(ben)發(fa)明實施(shi)(shi)例(li)的技術(shu)方案作進一步的詳細描(miao)述(shu)，顯然，所(suo)描(miao)述(shu)的實施(shi)(shi)例(li)僅僅是本(ben)發(fa)明一部(bu)分實施(shi)(shi)例(li)，而不是全部(bu)的實施(shi)(shi)例(li)。基于本(ben)發(fa)明中(zhong)的實施(shi)(shi)例(li)，本(ben)領域技術(shu)人員在沒有(you)做出創(chuang)造(zao)性(xing)勞動前提下所(suo)獲(huo)得的所(suo)有(you)其他實施(shi)(shi)例(li)，都屬于本(ben)發(fa)明保護的范圍。

圖(tu)(tu)1是本(ben)發明提供的LED恒(heng)流(liu)驅動(dong)系統(tong)的恒(heng)流(liu)控(kong)制(zhi)電路的結構方(fang)框圖(tu)(tu)。參考圖(tu)(tu)1所示，該LED恒(heng)流(liu)驅動(dong)系統(tong)的恒(heng)流(liu)控(kong)制(zhi)電路1，包括電壓控(kong)制(zhi)電路10和驅動(dong)信號(hao)生成電路11，

所述電壓控制電路10，用于根據PWM控制信號V_DIM和時鐘信號V_OSC的控制，在第一參考電壓V_REF和第二參考電壓0V及負載采樣反饋電壓V_FB中選擇出參考電壓和反饋電壓，將所述參考電壓和反饋電壓進行調制輸出調節電壓信號V_Q；PWM控制信號V_DIM為外部PWM調光信號，當沒有外部PWM調光時，PWM控制信號V_DIM設置為高電平；

驅動信號生成電路11，用于根據所述調節電壓信號V_Q和固定頻率的鋸齒波信號V_W進行比較得到占空比變化的驅動信號V_D，通過所述驅動信號V_D來控制(zhi)負(fu)載的電(dian)壓，使負(fu)載的電(dian)流保持恒定。

本實(shi)施(shi)例(li)中，負載(zai)優選為LED燈串(chuan)，在其他(ta)實(shi)施(shi)例(li)中也可以為其他(ta)恒流驅動的(de)電子系統。

本發明提供的LED恒流驅動系統的恒流控制電路電壓控制電路根據PWM控制信號V_DIM和時鐘信號V_OSC的控制，在第一參考電壓V_REF和第二參考電壓0V及負載采樣反饋電壓V_FB中選擇出參考電壓和反饋電壓，將所述參考電壓和反饋電壓進行調制輸出調節電壓信號V_Q，驅動信號生成電路根據所述調節電壓信號V_Q和固定頻率的鋸齒波信號V_W進行比較得到占空比變化的驅動信號V_D，通過所述驅動信號V_D來控制負載的電壓，使負載的電流保持恒定，克服了傳統PWM調光受頻率限制的問題，也解決了模擬調光精度低的問題，本發明負載采樣反饋電壓V_FB為直流電壓信號，外部PWM調光信號的變化直接體現為負載采樣反饋電壓V_FB的(de)電壓(ya)值的(de)變(bian)化，不受(shou)頻率限制，調節(jie)范(fan)圍更廣，調光(guang)精度高。

所述電壓控制電路10包括電壓選擇電路100和調光控制電路101。所述電壓選擇電路100用于根據PWM控制信號V_DIM和時鐘信號V_OSC的控制，在第一參考電壓V_REF和第二參考電壓0V及負載采樣反饋電壓V_FB中選擇出參考電壓和反饋電壓；參考電壓為第一參考電壓V_REF和第二參考電壓0V中的任意一個，反饋電壓為負載采樣反饋電壓V_FB。所述調光控制電路101用于根據PWM控制信號V_DIM和時鐘信號V_OSC的控制，對所述參考電壓和反饋電壓進行調制，輸出調節電壓信號V_Q。

優選地(di)，所述電(dian)(dian)(dian)(dian)壓控制電(dian)(dian)(dian)(dian)路(lu)10還(huan)包括(kuo)低(di)(di)通濾(lv)波器102，所述低(di)(di)通濾(lv)波器102連接(jie)于所述調光(guang)控制電(dian)(dian)(dian)(dian)路(lu)101的輸出側。該(gai)低(di)(di)通濾(lv)波器可以(yi)防止系統啟動階段的浪涌(yong)電(dian)(dian)(dian)(dian)流，在此設置大電(dian)(dian)(dian)(dian)容，保證(zheng)系統穩定，并(bing)將調光(guang)控制電(dian)(dian)(dian)(dian)路(lu)的輸出信(xin)號過(guo)濾(lv)成直(zhi)流平均電(dian)(dian)(dian)(dian)壓。

結合圖1所示，所述驅動信號生成電路11包括振蕩器電路110、斜坡補償電路111和PWM比較電路112，所述振蕩器電路110用于為LED恒流驅動系統提供工作頻率，并為所述斜坡補償電路111提供固定頻率的鋸齒波；所述斜坡補償電路111用于將LED恒流驅動系統的電感電流采樣信號V_ISW和所(suo)(suo)述振(zhen)蕩器(qi)電(dian)(dian)(dian)(dian)路110輸出的鋸齒(chi)波(bo)進行疊(die)加；所(suo)(suo)述PWM比較電(dian)(dian)(dian)(dian)路112用于將所(suo)(suo)述電(dian)(dian)(dian)(dian)壓(ya)(ya)控制電(dian)(dian)(dian)(dian)路10輸出的所(suo)(suo)述調節電(dian)(dian)(dian)(dian)壓(ya)(ya)信號(hao)同經過所(suo)(suo)述斜坡補償電(dian)(dian)(dian)(dian)路111輸出的信號(hao)進行比較，輸出占空比可變的方波(bo)信號(hao)來控制負載2的電(dian)(dian)(dian)(dian)壓(ya)(ya)，使負載2的電(dian)(dian)(dian)(dian)流保持恒定。

進(jin)一步地，所述恒(heng)流控制電路1還包括(kuo)：

參考電源電路12，用于為LED恒流驅動系統提供電源，并為所述電壓選擇電路100提供所述第一參考電壓V_REF和所述(shu)第(di)二參考電壓0V；

驅動(dong)電路(lu)13，用于將(jiang)所述PWM比較電路(lu)112輸出的(de)方(fang)波信(xin)號進(jin)行放大。將(jiang)方(fang)波信(xin)號進(jin)行放大可以提高LED恒(heng)流驅動(dong)系(xi)統的(de)帶載能力。

圖2是本發明提供的電壓選擇電路的電路原理圖。結合圖1、圖2所示，本實施例中，所述電壓選擇電路100包括第一傳輸門TG1、第二傳輸門TG2、第一MOS管NM31、第二MOS管NM32、第三MOS管NM33和第四MOS管NM34；所述第一傳輸門TG1的輸出端與所述第二傳輸門TG2的輸出端連接，所述第一傳輸門TG1的輸入端連接第一參考電壓V_REF，所述第一傳輸門TG1的控制端連接第一PWM控制信號V_DH，所述第二傳輸門TG2的輸入端連接第二參考電壓0V，所述第二傳輸門TG2的控制端連接第二PWM控制信號V_DL，所述第一傳輸門TG1的輸出端與所述第二傳輸門TG2的輸出端的連接點與所述第一MOS管NM31的漏極和第二MOS管NM32的源極的連接點連接，所述第一MOS管NM31的柵極連接第一時鐘信號V_OH，所述第一MOS管NM31的源極與所述第三MOS管NM33的源極連接，所述第三MOS管NM33的柵極與第二時鐘信號V_OL提供端連接，所述第三MOS管NM33的漏極與所述第四MOS管NM34的源極連接，所述第四MOS管NM34的柵極連接第一時鐘信號V_OH，所述第四MOS管NM34的漏極與所述第二MOS管NM32的漏極連接，所述第二MOS管NM32的柵極連接于第二時鐘信號V_OL提供端，所述第三MOS管NM33的漏極與所述第四MOS管NM34的源極的連接點與負載采樣反饋電壓V_FB提供端連接，所述第一MOS管NM31的源極與所述第三MOS管NM33的源極連接點引出第一電壓輸出端V₁，所述第四MOS管NM34的漏極與所述第二MOS管NM32的漏極連接點引出第二電壓輸出端V₂。本實施例中，第一PWM控制信號V_DH為PWM控制信號V_DIM的電平，第一PWM控制信號V_DH通過非門處理得到第二PWM控制信號V_DL；第一時鐘信號V_OH為時鐘信號V_OSC的電平，第一時鐘信號V_OH通過非門處理得到第二時鐘信號V_OL。

該電壓選擇電路100通過PWM控制信號V_DIM和時鐘信號V_OSC控制完成電壓信號傳輸。PWM控制信號V_DIM和時鐘信號V_OSC均為方波信號，通常f_OSC>>f_DIM。電壓信號為雙輸入雙輸出，輸入端分別是內部參考電源提供的參考電壓V_REF/0V和負載采樣反饋電壓V_FB，兩輸出端信號分別是第一電壓輸出端V₁和第二電壓輸出端V₂。當第一PWM控制信號V_DH為高電平時，第一傳輸門TG1導通，第二傳輸門TG2關斷，第一參考電壓V_REF通過第一傳輸門TG1傳至開關陣列，反之，當V_DH為低電平時，第二傳輸門TG2導通，第一傳輸門TG1關斷，第二參考電壓0V通過第二傳輸門TG2傳至開關陣列；當第一時鐘信號V_OH為高電平時，第一MOS管NM31和第四MOS管NM34開啟，第二MOS管NM32和第三MOS管NM33關斷，第一電壓輸出端V₁端輸出為第一參考電壓V_REF或第二參考電壓0V(具體由PWM控制信號V_DIM決定)，第二電壓輸出端V₂端輸出為V_FB，反之，當第一時鐘信號V_OH為低電平時，第二MOS管NM32和第三MOS管NM33開啟，第一MOS管NM31和第四MOS管NM34關斷，第一電壓輸出端V₁輸出為負載采樣反饋電壓V_FB，第二電壓輸出端V₂輸出為第一參考電壓V_REF或第二參考電壓0V(具體由PWM控制信號V_DIM決定)。電(dian)壓(ya)選(xuan)擇(ze)電(dian)路100的具體傳(chuan)輸控制(zhi)功能見表1。

表1：電壓選擇電路(lu)的(de)傳輸控制功能

圖3是本發明提供的調光控制電路的電路原理圖。結合圖1、圖3所示，所述調光控制電路101包括偏置電流電路1010、差分輸入電路1011、共柵電路1012、開關電路1013和尾電流源電路1014；所述偏置電流電路1010包括第一偏置電流電路10100、第二偏置電流電路10101和第三偏置電流電路10102；所述共柵電路1012包括第一共柵電路和第二共柵電路；所述開關電路1013包括第一開關電路和第二開關電路，所述尾電流源電路1014包括第一尾電流源電路和第二尾電流源電路；所述第一偏置電流電路10100一端與電源提供端VCC連接，另一端與所述差分輸入電路1011連接；所述差分輸入電路1011的第一輸入端與所述第一電壓輸出端V₁連接，所述差分輸入電路1011的第二輸入端與第二電壓輸出端V₂連接，所述差分輸入電路1011的第一輸出端與所述第一尾電流源電路連接，所述差分輸入電路1011的第二輸出端與所述第二尾電流源電路連接；所述第二偏置電流電路10101一端連接于所述電源提供端VCC，另一端與所述第一共柵電路的第一連接端連接，所述第一共柵電路的第二連接端與所述差分輸入電路1011的第二連接端連接，所述第一共柵電路的第三連接端與所述差分輸入電路1011的第一連接端連接；所述第三偏置電流電路10102一端連接于所述電源提供端VCC，另一端與所述第二共柵電路的第一連接端連接，所述第二共柵電路的第二連接端與所述差分輸入電路1011的第一連接端連接，所述第二共柵電路的第三連接端與所述差分輸入電路1011的第二連接端連接；所述開關電路1013與時鐘信號V_OSC連接。具體地，所述第一偏置電流電路10100包括第五MOS管PM23和第六MOS管PM24，所述第二偏置電流電路10101包括第七MOS管PM25和第八MOS管PM26，所述第三偏置電流電路10102包括第九MOS管PM27和第十MOS管PM28；所述差分輸入電路1011包括第十一MOS管PM21和第十二MOS管PM22；所述第一共柵電路包括第十三MOS管NM21；所述第二共柵電路包括第十四MOS管NM22；所述第一開關電路包括第十五MOS管NM23和第十六MOS管NM24；所述第二開關電路包括第十七MOS管NM25和第十八MOS管NM26；所述第一尾電流源電路包括第十九MOS管NM27；所述第二尾電流源電路包括第二十MOS管NM28；所述第五MOS管PM23的源極連接所述電源提供端VCC，其漏極與所述第六MOS管PM24的源極連接，其柵極連接第一偏置電壓Vb1；所述第六MOS管PM24的漏極連接所述第十一MOS管PM21和第十二MOS管PM22的源極，其柵極連接第二偏置電壓Vb2；所述第十一MOS管PM21的漏極與所述第十九MOS管NM27的漏極連接，其柵極連接所述第一電壓輸出端V₁；所述第十九MOS管NM27的源極接地，其柵極連接第四偏置電壓Vb4；所述第十二MOS管PM22的漏極與所述第二十MOS管NM28的漏極連接，其柵極連接所述第二電壓輸出端V₂；所述第二十MOS管NM28的源極接地，其柵極連接所述第四偏置電壓Vb4；所述第七MOS管PM25的源極連接所述電源提供端VCC，其漏極與所述第八MOS管PM26的源極連接，其柵極連接所述第一偏置電壓Vb1；所述第八MOS管PM26的漏極與所述第十三MOS管NM21的漏極連接，其柵極連接所述第二偏置電壓Vb2；所述第十三MOS管NM21的源極連接所述第十五MOS管NM23和第十六MOS管NM24的漏極，其柵極連接第三偏置電壓Vb3；所述第十五MOS管NM23的源極連接所述第十二MOS管PM22的漏極，其柵極與所述第二時鐘信號V_OL連接；所述第十六MOS管NM24的源極與所述第十一MOS管PM21的漏極連接，其柵極連接所述第一時鐘信號V_OH；所述第九MOS管PM27的源極連接所述電源提供端VCC，其漏極與所述第十MOS管PM28的源極連接，其柵極與所述第一偏置電壓Vb1連接；所述第十MOS管PM28的漏極與所述第十四MOS管NM22的漏極連接，其柵極與所述第二偏置電壓Vb2連接；所述第十四MOS管NM22的源極與所述第十七MOS管NM25和第十八MOS管NM26的漏極連接，其柵極與所述第三偏置電壓Vb3連接；所述第十七MOS管NM25的源極與所述第十一MOS管PM21的漏極連接，其柵極與所述第二時鐘信號V_OL連接；所述第十八MOS管NM26的源極與所述第十二MOS管PM22的漏極連接，其柵極連接所述第一時鐘信號V_OH；所述第(di)十MOS管的漏極引出調(diao)節電壓信號輸出端。

該調光控制電路基本結構為高精度寬擺幅的折疊共源共柵運放，其中，第五MOS管PM23、第六MOS管PM24、第七MOS管PM25、第八MOS管PM26、第九MOS管PM27、第十MOS管PM28、十一MOS管PM21、第十二MOS管PM22均選用P型MOS管；第十三MOS管NM21、第十四MOS管NM22、第十五MOS管NM23、第十六MOS管NM24、第十七MOS管NM25、第十八MOS管NM26、第十九MOS管NM27和第二十MOS管NM28均選用N型MOS管。第一偏置電流電路10100為差分輸入電路1011提供偏置電流；第十三MOS管NM21和第十四MOS管NM22為共柵管，與差分對管第五MOS管PM23和第六MOS管PM24構成折疊共源共柵結構；第九MOS管PM27、第十MOS管PM28平衡輸出級電流；兩路輸出級的電流偏置分別為第七MOS管PM25和第八MOS管PM26及第九MOS管PM27和第十MOS管PM28，考慮匹配因素，第七MOS管PM25和第九MOS管PM27偏置電壓同第五MOS管PM23均為第一偏置電壓Vb1，第八MOS管PM26P和第十MOS管M28偏置電壓同第六MOS管PM24均為第二偏置電壓Vb2；此電路特別之處在于，差分對管和共柵極輸出之間接入四個開關管第十五MOS管NM23、第十六MOS管NM24、第十七MOS管NM25和第十八MOS管NM26，第十五MOS管NM23和第十六MOS管NM24開啟和關斷分別由VOL和VOH控制，NM25和NM26連接NM22，開啟和關斷也分別由第二時鐘信號V_OL和第一時鐘信號V_OH控制。當第一時鐘信號V_OH為高電平時，NM24和NM26開啟，NM23和NM25關斷，此時V1作為運放的正相端，V2作為運放的反相端；反之，當VOH為低電平時，第十五MOS管NM23和第十七MOS管NM25開啟，第十六MOS管NM24和第十八MOS管NM26關斷，此時第一電壓輸出端V₁作為運放的反相端，第二電壓輸出端V₂作為運放的正相端。該運放隨第一時鐘信號V_OH和第二時鐘信號V_OL變換，輸入端可隨之變換。第一電壓輸出端V₁、第二電壓輸出端V₂同調光控制電路的調節電壓信號輸出端V₀輸出的電壓信號，結合PWM控制信號V_DIM和時鐘信號V_OSC的(de)(de)信(xin)號控(kong)制，輸出信(xin)號的(de)(de)關系見表2。

表2：調(diao)光(guang)控(kong)制(zhi)(zhi)電路(lu)輸入、輸出與(yu)控(kong)制(zhi)(zhi)信號的關系(xi)

需要說明的是，整個圖3所示(shi)的調光控制電路可以用運放(fang)來表示(shi)，表2中(zhong)INP表示(shi)運放(fang)的正相輸入端，INN表示(shi)運放(fang)的反(fan)向(xiang)輸入端。

圖4是本發明提供的調光控制電路在PWM調光模式時的電路示意圖。圖5是本發明提供的調光控制電路在無PWM調光模式時的電路示意圖。結合圖1、圖2、圖3、圖4和圖5以及表1和表2所示，本實施例中，當第一PWM控制信號V_DH為高電平時，無論第一時鐘信號V_OH如何變化，運放正相輸入端均為第一參考電壓V_REF，反相輸入端均為VFB，反之當VDH為低電平時，無論VOH如何變化，運放正相端均為第二參考電壓0V，反相輸入端均為負載采樣反饋電壓V_FB。根(gen)據應用需(xu)求，系(xi)統可分為有外(wai)部PWM調(diao)(diao)光模式和無PWM調(diao)(diao)光模式，兩種(zhong)模式下運放處于完(wan)全不同的工作狀(zhuang)態。

當有外部PWM控制信號V_DIM輸入時，此時運放成為高精度的比較器，正相輸入端在第一參考電壓V_REF和第二參考電壓0V之間不斷切換，反相輸入端始終連接負載采樣反饋電壓V_FB，輸出端V₀為方波信號。當正向輸入端輸入為第一參考電壓V_REF，輸出端V₀為高電平HV，當正向輸入端輸入為第二參考電壓0V時，輸出端V₀為低電平HL。輸出端V₀直接連接低通濾波器102，低通濾波器102實現RC濾波，可將輸出端V₀輸出的方波信號濾平取平均值V_Q，可知PWM控制信號V_DIM的占空比將直接影響V_Q值，二者嚴格遵循線性關系，從PWM控制信號V_DIM方波直接轉化為V_Q直流電壓信號，可認為外部PWM信號轉模擬調光的方式，當PWM控制信號V_DIM占空比增大或減小時，V_Q將隨之增大或減小，V_Q再同經過斜(xie)坡(po)補償后的電感(gan)電流鋸齒波(bo)信(xin)號經過PWM比較電路112，輸出(chu)占空比可調的方波(bo)信(xin)號，經驅動(dong)電路13驅動(dong)外(wai)部MOS管(guan)后影響到(dao)系統輸出(chu)，整個系統在不斷(duan)的動(dong)態調整中達到(dao)穩態，由此，實現調光(guang)功能。

當無外部PWM控制信號V_DIM時，V_DIM將始終置為高電平，運放的正相輸入端始終為第一參考電壓V_REF，反相輸入端負載采樣反饋電壓V_FB經過系統調節最終達到平衡狀態，系統穩定時V_FB＝V_REF，輸出端為固定靜態電壓V_Q。此時系統為單一電壓環路，同理，V_Q再同經過斜坡補償后的電感電流鋸齒波信號經過PWM比較電路112，輸出占空比可調的方波信號，經驅動電路13驅動外部MOS管后影響到系統輸出，負載采樣反饋電壓V_FB的實時變(bian)化(hua)反饋至運放(fang)，經系(xi)統調節達(da)到穩態(tai)。

需要說明的是，本發明提到的第一PWM控制信號V_DH為PWM控制信號V_DIM的電平，第一PWM控制信號V_DH通過非門處理得到第二PWM控制信號V_DL；第一時鐘信號V_OH為時鐘信號V_OSC的電平，第一時鐘信號V_OH通過非門處理得到第二時鐘信號V_OL。第一參考電壓V_REF或第二參(can)考電壓0V。

圖(tu)6是(shi)本發明提(ti)供的LED恒(heng)(heng)流(liu)驅(qu)動(dong)(dong)系統(tong)的結構方(fang)塊圖(tu)。參考圖(tu)6所示，該LED恒(heng)(heng)流(liu)驅(qu)動(dong)(dong)系統(tong)包括上述所述的恒(heng)(heng)流(liu)控制電路1。

進一步地，LED恒流驅動系統還包括升壓電路3，所述升壓電路3包括第二十一MOS管NM51、電感L51、續流二極管D51和充電電容C51，所述電感L51一端連接電源VIN，另一端連接所述續流二極管D51的正極，所述續流二極管D51的負極連接負載2的輸入端；所述第二十一MOS管NM51的漏極與所述續流二極管D51的正極連接，其源極通過第一電阻R51接地，其柵極與所述恒流控制電路1的輸出端連接；所述充電電容C51一端與所述續流二極管D51的負極連接，另一端接地；負載2的輸出端通過第二電阻R52接地，所述恒流控制電路1通過負載2的輸出端采集負載采樣反饋電壓V_FB。

本(ben)發明(ming)(ming)提供的(de)(de)LED恒(heng)流(liu)驅動系統及其恒(heng)流(liu)控制電(dian)路融合了(le)PWM調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)和模(mo)(mo)擬(ni)(ni)(ni)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)，現(xian)有技術(shu)通(tong)(tong)常(chang)單(dan)一方(fang)式(shi)(shi)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)，外部(bu)PWM調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)時不能同時進行模(mo)(mo)擬(ni)(ni)(ni)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)，本(ben)發明(ming)(ming)可將(jiang)PWM調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)和模(mo)(mo)擬(ni)(ni)(ni)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)融合為一種(zhong)新型的(de)(de)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)式(shi)(shi)；本(ben)發明(ming)(ming)實現(xian)了(le)外部(bu)PWM調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)轉模(mo)(mo)擬(ni)(ni)(ni)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)的(de)(de)控制，現(xian)有技術(shu)PWM調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)式(shi)(shi)通(tong)(tong)常(chang)只單(dan)純控制輸(shu)出信號(hao)的(de)(de)占(zhan)空(kong)比或(huo)頻(pin)率(lv)，缺點(dian)是(shi)會受到頻(pin)率(lv)限(xian)制，而且線性度較(jiao)差，模(mo)(mo)擬(ni)(ni)(ni)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)式(shi)(shi)通(tong)(tong)常(chang)通(tong)(tong)過(guo)改變設(she)定的(de)(de)直(zhi)流(liu)參(can)考電(dian)壓(ya)，采樣(yang)(yang)信號(hao)隨之(zhi)跟隨調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)整的(de)(de)方(fang)案(an)，缺點(dian)是(shi)精(jing)度較(jiao)差，本(ben)發明(ming)(ming)直(zhi)接摒棄了(le)兩種(zhong)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)方(fang)式(shi)(shi)的(de)(de)缺點(dian)，對(dui)外加PWM調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)信號(hao)的(de)(de)頻(pin)率(lv)無(wu)需(xu)限(xian)制，系統輸(shu)出線性跟隨PWM信號(hao)的(de)(de)占(zhan)空(kong)比，無(wu)需(xu)通(tong)(tong)過(guo)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)節參(can)考電(dian)壓(ya)值來進行模(mo)(mo)擬(ni)(ni)(ni)調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)，調(diao)(diao)(diao)(diao)(diao)(diao)(diao)(diao)光(guang)(guang)(guang)(guang)精(jing)度也得到了(le)較(jiao)大的(de)(de)提升；本(ben)發明(ming)(ming)采取單(dan)電(dian)壓(ya)環路控制，直(zhi)接利用(yong)采樣(yang)(yang)電(dian)阻(zu)進行采樣(yang)(yang)，可以在應用(yong)中(zhong)節約(yue)外部(bu)恒(heng)流(liu)管(guan)，為外部(bu)PCB板節省了(le)成(cheng)本(ben)，可作為降(jiang)成(cheng)本(ben)方(fang)案(an)應用(yong)。

以(yi)上(shang)(shang)內容(rong)僅為本(ben)(ben)發(fa)明的(de)(de)較(jiao)佳(jia)實施例，對于(yu)本(ben)(ben)領(ling)域(yu)的(de)(de)普通技術(shu)人員(yuan)，依據(ju)本(ben)(ben)發(fa)明的(de)(de)思(si)想，在(zai)具體實施方式(shi)及應用范圍上(shang)(shang)均會有(you)改變之處(chu)，本(ben)(ben)說(shuo)明書內容(rong)不應理解為對本(ben)(ben)發(fa)明的(de)(de)限制。