利盈娱乐(中国)创新平台有限公司

三端稳压管，主要有两种，一种输出电压是固定的，称为固定输出三端稳压管，另(ling)一种输(shu)出电压(ya)是可调(diao)的，称为可调(diao)输(shu)出三(san)端(duan)稳(wen)(wen)压(ya)管。固定三(san)端(duan)稳(wen)(wen)压(ya)器属于串(chuan)联型稳(wen)(wen)压(ya)电路，因(yin)此它的原(yuan)理(li)等(deng)同于串(chuan)联型稳(wen)(wen)压(ya)电路。

其中R1、Rp、R2组成(cheng)的(de)分压(ya)器(qi)是(shi)取(qu)样电(dian)路，从输出端(duan)取(qu)出部分电(dian)压(ya)UB2作为取(qu)样电(dian)压(ya)加(jia)至三极管(guan)T2的(de)基极。Dz以(yi)其稳(wen)(wen)定电(dian)压(ya)Uz作为基准电(dian)压(ya)，加(jia)在T2的(de)发射极上。R3是(shi)稳(wen)(wen)压(ya)管(guan)的(de)限(xian)流电(dian)阻。三极(ji)管(guan)T2组成(cheng)比较放大电(dian)路(lu)(lu)，它将(jiang)取样电(dian)压(ya)(ya)UB2与基准电(dian)压(ya)(ya)Uz加以比较和放大，再(zai)去控制三极(ji)管(guan)T1的(de)基极(ji)电(dian)位。输入(ru)电(dian)压(ya)(ya)Ui加在三极(ji)管(guan)T1与负(fu)载RL相串联的(de)电(dian)路(lu)(lu)上，因此，改变(bian)T1集电(dian)极(ji)间(jian)的(de)电(dian)压(ya)(ya)降UCE1便可调(diao)节RL两端的(de)电(dian)压(ya)(ya)Uo。也(ye)就是说，稳压电路的输出电压Uo可(ke)以通过(guo)三极管(guan)T1加以调节，所以T1称(cheng)为调整管(guan)。由于调整元件(jian)是晶体管管，而且在电路中与负载相串联，故称为(wei)晶体管串(chuan)联型稳压电路。

电(dian)(dian)(dian)阻R4和T1的基(ji)(ji)极偏置电(dian)(dian)(dian)阻，也(ye)是(shi)T2的集(ji)电(dian)(dian)(dian)极负(fu)载(zai)电(dian)(dian)(dian)阻。当电(dian)(dian)(dian)网电(dian)(dian)(dian)压降(jiang)低或负(fu)载(zai)电(dian)(dian)(dian)阻减小而使(shi)输出端(duan)电(dian)(dian)(dian)压有所(suo)下(xia)降(jiang)时，其取样电(dian)(dian)(dian)压UB2相应减小，T2基(ji)(ji)极电(dian)(dian)(dian)位(wei)(wei)下(xia)降(jiang)。但因T2发射极电(dian)(dian)(dian)位(wei)(wei)既稳压管的稳定Uz保持不(bu)变(bian)(bian)(bian)，所(suo)以(yi)发(fa)射极电(dian)压(ya)UBE2减(jian)小(xiao)，导(dao)致(zhi)T2集电(dian)极电(dian)流减(jian)小(xiao)而集电(dian)极电(dian)位(wei)Uc2升(sheng)高。由于放(fang)大(da)(da)管(guan)(guan)T2的集电(dian)极与调(diao)整(zheng)管(guan)(guan)T1的基(ji)极接在一起，故T1基(ji)极电(dian)位(wei)升(sheng)高，导(dao)致(zhi)集电(dian)极电(dian)流增大(da)(da)而管(guan)(guan)压(ya)降UCE1减(jian)小(xiao)。因为T1与RL串联，所(suo)以(yi)，输出(chu)(chu)电(dian)压(ya)Uo基(ji)本不(bu)变(bian)(bian)(bian)。同理,当电(dian)网电(dian)压(ya)或负载发(fa)生变(bian)(bian)(bian)化引起输出(chu)(chu)电(dian)压(ya)Uo增大(da)(da)时，通过取(qu)样、比较放(fang)大(da)(da)、调(diao)整(zheng)等过程，将使调(diao)整(zheng)调(diao)整(zheng)管(guan)(guan)的管(guan)(guan)压(ya)降UCE1增加，结果抑(yi)制了(le)输出(chu)(chu)端电(dian)压(ya)的增大(da)(da)，输出(chu)(chu)电(dian)压(ya)仍基(ji)本保持不(bu)变(bian)(bian)(bian)。

调节电(dian)位器Rp，可对输出(chu)电(dian)压进(jin)行微(wei)调。调整管T1与负载电(dian)阻(zu)RL组成的是射极输出(chu)电(dian)路(lu)，所以具有稳压管型号输出电(dian)(dian)压的(de)特点。在串联型稳压电(dian)(dian)源电(dian)(dian)路(lu)的(de)工(gong)作过(guo)(guo)程中，要求调(diao)整(zheng)管始终处在放大(da)(da)状态。通过(guo)(guo)调(diao)整(zheng)管的(de)电(dian)(dian)流等于负(fu)载(zai)(zai)电(dian)(dian)流，因此必须(xu)选用适当的(de)大(da)(da)功率管作调(diao)整(zheng)管，并按规定安装散(san)热装置。为(wei)了防止短(duan)路(lu)或长期过(guo)(guo)载(zai)(zai)烧坏调(diao)整(zheng)管，在直流稳压器(qi)中一(yi)般还设有短(duan)路(lu)保(bao)护和(he)过(guo)(guo)载(zai)(zai)保(bao)护等电(dian)(dian)路(lu)。

联系方式：邹先生

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