500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/41/1147740860.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">求助3845构成的高压开关电源效率如何提高(含详细电路参数)
在设计中需要用到20kv,0.5mA的高压恒流源,用uc3845和彩电的高压包设计了如下电路,初级线圈在FBT的磁心上绕4圈,电感为16~20uH,电压反馈利用FBT的一个绕组,升压部分用FBT的高压绕组,现在调试中当输入功率为12V×2A时,输出最大功率只有10W左右,功率场效应管发热严重(IRF460,500V,21A,内阻0.27欧)请教高手如何才能有效提高电路的效率500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/41/1147740860.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
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