[求助]电路高手帮我看看这个问题
<P>本人没有做过实际电路. 现在有个产品要完成如下功能见图, 其中 TE为半导体制冷片, 大约5欧, 其工作要求纹波小于5%.实际工作时, 输入端频繁开断. 请各位行家帮我看看, 如何选择器件, 即整流桥的要求和电容的要求, 并推荐使用型号. 谢谢了.</P><img src="data/attachment/forum/dvbbs/2005-1/200519131048158.jpg" 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(\'data/attachment/forum/dvbbs/2005-1/200519131048158.jpg\');}" onmousewheel="return imgzoom(this);" alt="" /><P>电压是多少?或者电流是多少?如果电压真的是20V,那么电流为4A。纹波小于5%则电容不小。</P><P>假设纹波峰-峰值要求为2V,那么电容要求=4×0.01/2=0.02法拉=20000微法。若嫌电容大,则需要稳压电路。</P>
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