电容电路简介

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                    <section><section powered-by="gulangu"><section><section><p><img src="image/20201019/c61af11b2d54465c37df0dd5cb7574bd_1.gif" /></p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>电容器主要特性与作用</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp;电容器主要特性是隔直通交，能存储电荷，主要作用有耦合、旁路、滤波、退耦、振荡、补偿等。</p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>容抗</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp;电容器能够通过交流电，但对交流电仍存在阻碍作用，用容抗表示，及XC=1/2πfc。</p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>电容串联电路</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/d6fbee33392f92047a00966be4a986d8_2.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>1、串联电容越多，总容量越小，即1/C=1/C1+C2</p><p>2、串联电容中，流过各电容器的电流相等。</p><p>3、小电容器上的压降大，大电容器上的压降小。</p></section></section></section><section powered-by="gulangu"><section><section> <section> <section powered-by="gulangu"><section><section><p>电容并联电路</p></section></section></section> </section> </section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/5cd15f552af9e1c8fa756edf46720657_3.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>1、并联电容C=C1+C2</p><p>2、电路中，D1为整流二极管，C1为大电解电容，用来滤波，C2容量远小于C1，用来高频滤波作用，理论上讲，C1的高频滤波效果优于C2，但是，由于C1的容量很大，在制造时要将两相互绝缘的极板卷绕起来，以减小大电容的体积。由于导体卷绕它存在一个电感L，所以大容量的等效电路是一个大电容的高频阻抗反而大，所以要加一个小电容C2来起高频滤波作用，因为小电容感抗很小，高频特性好。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/61e688b539ff310a021854b08a7c444a_4.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; 上电路中，采用两个滤波电容C1、C2容量相同且容量较大的原因：</p><p>一是可靠性增加了，如若电路中有一只滤波电容开路了，另一只仍能起作用，以维持电路继续工作；二是电解电容容量太大后，体积大、漏电也增大，用两只较小电容并联后代替一只大电容效果较好。</p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section> <section powered-by="gulangu"><section><section><p>欢</p></section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>迎</p></section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>关</p></section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>注</p></section></section></section> </section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section> <section powered-by="gulangu"><section><section><p><img src="image/20201019/096d89b1d4858d2a2f1cfa08cfd98d8e_5.jpg" /></p></section></section></section> </section><section> <section powered-by="gulangu"><section><section> </section></section></section> </section><section> <section powered-by="gulangu"><section><section><p>关注我们</p><p>一起涨姿势！</p></section></section></section> </section></section></section></section>