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发表于 2005-3-14 19:44
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测试用的变压器是
前一阵子定做的100W R牛,有组8V 5A的输出,是打算给MJ的电子管灯丝供电用的,手头上正好有一个8.2欧50W的线绕电阻,估计了一下10V/8.2O ,大致有个1.2A的负载电流也可以说明问题了。又拿了2个16000U/50V AEROM的大水塘,进行C 、 C+C 、 CLC滤波效果的对比。
首先用的是一个16000U做滤波,这时候测量不接负载的电压是11.8V左右
<img src="attachments/dvbbs/2005-3/2005314194129382.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(\'attachments/dvbbs/2005-3/2005314194129382.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
接上负载后电压下降为9.5V,在负载两端接上示波器,测量链波,100MV/DIV档
<img src="attachments/dvbbs/2005-3/2005314194359.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(\'attachments/dvbbs/2005-3/2005314194359.jpg\');}" onmousewheel="return imgzoom(this);" alt="" />
这时候看到的波形有幅度500MVPP左右的链波 |
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