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/70/1399561225268101.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">附图,请教BUCK电感电流问题.谢谢.
采用3525控制BUCK经典电路,交流220V经整流桥输入,功率目前用400欧电阻,占空比约0.7,Vgs、Gds、二极管电压波形、电感电压波形在0.2-0.9占空比下都正常.但是电感电流出现问题.图中黄色上是用互感器测的电感电流波形;蓝色下是在电感一侧串联了5欧/10W电阻所的波形.电感为5mH左右,可见在mosfet管动作转换时刻,有毛刺尖峰,调节占空比、改变电感值,都没有明显效果,而且最终输出还有100Hz左右10V峰峰值的偏差,不知道哪位高手能指点一二.多谢
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/70/1399561225268101.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">
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