充电mos管,mos管双向充电电路原理图-KIA MOS管

MOS管实现双向充电

MOS管实(shi)现双向充电(dian)的原理是通过控制两个背靠背连接的MOS管的栅极信号(hao)，使(shi)得电(dian)流可以在(zai)两个方向上流动。

当控制(zhi)输出为(wei)高电平时(shi)，一(yi)个(ge)(ge)MOS管导通，允许电流从(cong)(cong)一(yi)个(ge)(ge)方(fang)向(xiang)(xiang)(xiang)(xiang)流动(dong)；当控制(zhi)输出为(wei)低电平时(shi)，另一(yi)个(ge)(ge)MOS管导通，允许电流从(cong)(cong)相(xiang)反(fan)方(fang)向(xiang)(xiang)(xiang)(xiang)流动(dong)。这种设计使(shi)得(de)电流可以(yi)在两个(ge)(ge)方(fang)向(xiang)(xiang)(xiang)(xiang)上自由流动(dong)，从(cong)(cong)而实现双(shuang)向(xiang)(xiang)(xiang)(xiang)充电功能。

电路结构：

双向(xiang)(xiang)充电(dian)(dian)电(dian)(dian)路通常由两(liang)个背靠背连(lian)接(jie)的MOS管（Q1和(he)Q2）组成。Q1和(he)Q2的源极(ji)和(he)漏极(ji)相连(lian)，栅极(ji)分别(bie)由不同的控(kong)制(zhi)信号控(kong)制(zhi)。当(dang)控(kong)制(zhi)输出(chu)为高电(dian)(dian)平时，Q1导通，允许电(dian)(dian)流(liu)从VIN流(liu)向(xiang)(xiang)VOUT；当(dang)控(kong)制(zhi)输出(chu)为低(di)电(dian)(dian)平时，Q2导通，允许电(dian)(dian)流(liu)从VOUT流(liu)向(xiang)(xiang)VIN。

工作原理：

正向充电(dian)(dian)(dian)：当(dang)控制输出为高(gao)电(dian)(dian)(dian)平(ping)时，Q1的栅源(yuan)电(dian)(dian)(dian)压Vgs大于阈值电(dian)(dian)(dian)压Vth，Q1导(dao)(dao)(dao)通。此(ci)时，A点电(dian)(dian)(dian)位降低，B点电(dian)(dian)(dian)压为VIN减去二极管导(dao)(dao)(dao)通电(dian)(dian)(dian)压，Q2的栅源(yuan)电(dian)(dian)(dian)压Vgs小(xiao)于阈值电(dian)(dian)(dian)压Vth，Q2不导(dao)(dao)(dao)通。因此(ci)，电(dian)(dian)(dian)流从VIN经过Q1流向VOUT。

反向充电(dian)(dian)(dian)(dian)：当(dang)控(kong)制输(shu)出为(wei)低电(dian)(dian)(dian)(dian)平时，Q2的(de)栅源电(dian)(dian)(dian)(dian)压Vgs大于阈(yu)(yu)值(zhi)电(dian)(dian)(dian)(dian)压Vth，Q2导(dao)通。此(ci)时，B点(dian)电(dian)(dian)(dian)(dian)位升高，A点(dian)电(dian)(dian)(dian)(dian)压为(wei)VIN减去二(er)极管导(dao)通电(dian)(dian)(dian)(dian)压的(de)负值(zhi)，Q1的(de)栅源电(dian)(dian)(dian)(dian)压Vgs小于阈(yu)(yu)值(zhi)电(dian)(dian)(dian)(dian)压Vth，Q1不导(dao)通。因此(ci)，电(dian)(dian)(dian)(dian)流(liu)(liu)从(cong)VOUT经过Q2流(liu)(liu)向VIN。

mos管双向充电电路

当控(kong)制输出(chu)为低电(dian)平时，Q1的栅源电(dian)压(ya)Vgs=0，Q1不(bu)导通Q2的栅源之间电(dian)压(ya)相(xiang)等，不(bu)导通，VOUT没有输出(chu)。

当(dang)控(kong)制(zhi)输出为(wei)高电(dian)(dian)(dian)(dian)平时(shi)，Q1导(dao)通(tong)。A点(dian)(dian)(dian)电(dian)(dian)(dian)(dian)位变为(wei)低，B点(dian)(dian)(dian)电(dian)(dian)(dian)(dian)压(ya)(ya)为(wei)VIN-二极管Q导(dao)通(tong)电(dian)(dian)(dian)(dian)压(ya)(ya)，对于Q2来说Vgs=0-（VIN-0.7)=0.7-VIN<Vgs(th)，导(dao)通(tong)，B点(dian)(dian)(dian)电(dian)(dian)(dian)(dian)压(ya)(ya)变为(wei)VIN，此时(shi)对于Q3来说，栅(zha)源电(dian)(dian)(dian)(dian)压(ya)(ya)Vgs=0-VIN=-VIN<Vgs（th)，导(dao)通(tong)，VIN到VOUT的输出。反之从(cong)VOUT到VIN也(ye)一(yi)样这(zhei)个电(dian)(dian)(dian)(dian)路为(wei)共控(kong)制(zhi)端(duan)的对称双向充电(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)路。

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