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/17/1083638606.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">如何获取补偿电路运放的负电源
3875控制的移相全桥电路,闭合仿真,如果加超前补偿,动态和稳态性能都有很好的改善,可在实际电路中,补偿环节的运放必须有负电源,若增加一个输出绕组实现负电源,无疑增加电路成本和复杂性,均流控制芯片UC3907内部也有类似的运放,但是却无需负电源,不知何故,下图为3907内部电路
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