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专业知(zhī)识

电感在(zài)DC-DC升压电路的(de)工作原理

今天我们探讨(tǎo)电感实际电(diàn)路(lù)工(gōng)作(zuò)的(de)应用问题,在(zài)实际电路中主要是利(lì)用电感的通低频(pín)阻高频,通直流阻交流特(tè)性设计不同(tóng)电(diàn)路,下面我们来看一看电感在DC-DC的升压(yā)电路的(de)工作原理。

如图1所(suǒ)示是一(yī)种典型(xíng)的DC-DC的升压电路(lù),在(zài)手机应用电(diàn)路中,通常需要通(tōng)过升(shēng)压(yā)电路来驱动显示屏(píng)背光亮度,除了手机外还有电(diàn)视机和微波炉(lú),其次还有捕蝇器、电蚊拍等都需要将电源的电压进(jìn)行(háng)升(shēng)压。


1、开关S闭合:

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图1

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图2

如图1所示(shì),当(dāng)开关S闭合时,a、b、d构成闭合回(huí)路,电源E通过电感产生从小到(dào)大的电流i,此时t1(如图(tú)2中t1→t2)电流频率趋近高频,根据楞次定律(增反减同),电(diàn)感(gǎn)产生感(gǎn)应电(diàn)流(liú)方向与原电流i相(xiàng)反,感(gǎn)应电流阻碍i变化,电感感应电流方向为b→a,也就(jiù)是说电源电流i在电感上(shàng)转(zhuǎn)为磁能存(cún)储了下来,直到(dào)t2时电流(liú)i最大,阻(zǔ)碍力也是最大,电感(gǎn)存储的磁能也为最大。再接着t2过后电流倾向平缓,电(diàn)流频率趋近直(zhí)流,电感阻碍(ài)减弱,多余的电流通过开关(guān),组成闭(bì)合回路流(liú)向负极。

2、开关S断开:

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图3

图4

如图3所示,当开关S断开时,a、b、d构成不了(le)闭合回路,电源(yuán)E流过电(diàn)感(gǎn)电流(liú)瞬(shùn)间从大到大(dà)i,此时t3(如图4中t3→t4)电流频率(lǜ)趋近高频,根据楞次定律(lǜ)(增(zēng)反减同),电感产(chǎn)生感应(yīng)电流(liú)方向与原电(diàn)流i相(xiàng)同,感应(yīng)电流阻碍i变化,电(diàn)感感(gǎn)应电(diàn)流方(fāng)向为a→b,也就是说电源(yuán)电流i在电感上将已(yǐ)转的(de)磁能开始转(zhuǎn)换为电流,此时电流方向通过二(èr)极管a→b→c→d,即b点的电压为电感感应电动(dòng)势e加(jiā)上原电(diàn)源(yuán)的电压E,它们一起通过二极管D1向电容C充电存储下(xià)来(lái),并同时向负载输出(chū)电压U0,如果不考虑二极管的压降(jiàng),U0=E+e。其中(zhōng)感应电压大小(xiǎo)可(kě)以用(yòng)一个公式表示:

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该式(shì)表明感应电压大小与(yǔ)电(diàn)感(gǎn)大小、单位(wèi)时间电流变化率有关。

所以此(cǐ)时的电压U0高于电源电压(yā)E。直到t2时电流i最小,阻碍力也是最小,电感(gǎn)存储的磁能也基本快转换结束。

接(jiē)下(xià)来通过开关不断地闭合(hé)、断开,就可以不断地(dì)输出电(diàn)压U0,且(qiě)该电压U0高于电源电压E,从(cóng)而起(qǐ)到升压的目的。

3、开关换成场效(xiào)应管:

如果我(wǒ)们把开(kāi)关换成如图6所示的场(chǎng)效应(yīng)管(guǎn)Q1,场效应管(guǎn)栅极e控制信号能够有一种信号如图5这样的信号控制着开关(guān)的闭合、断开,即在t1时间开关闭(bì)合(hé),在(zài)t2时(shí)间开关断开,我们把这样(yàng)的信号叫做PWM脉冲(chōng)信号,就同样能输出(chū)高(gāo)压电压(yā)U0。

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图5

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图6

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更新时间:2025-07-17 07:36 来源:zhuhai.jywmgs.dezhou.rizhao.bynr.xinxiang.zz.pingliang.ww38.viennacitytours.com