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简单点,以П型滤波器为例
П型滤波器如图所示<img src="attachments/dvbbs/2005-4/200541023925155.gif" border="0" onload="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onmouseover="if(this.width>screen.width*0.7) {this.resized=true; this.width=screen.width*0.7; this.style.cursor=\'hand\'; this.alt=\'Click here to open new window\nCTRL+Mouse wheel to zoom in/out\';}" onclick="if(!this.resized) {return true;} else {window.open(\'attachments/dvbbs/2005-4/200541023925155.gif\');}" onmousewheel="return imgzoom(this);" alt="" />
滤波系数Q=Q1×Q2,其中Q1是C1滤波系数,Q2是电感L和C2组成的Г滤波器系数
一般取C1=C2=C
Q=未滤波系数/滤波后系数
对于全波整流电路,未滤波系数=0.67,滤波后系数根据电路要求取
假设取0.001,则Q=0.67/0.001=670
其中Q1=2.2·f·C·RL,Q2=400000LC
所以Q=8.8×100000×f×RL×LC×C
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