图解十步教你把普通开关电源模块改可调压电源
作者: kangdage
昨天文字说明了下如何改可调,今天有翻到两个电源模块,准备改了做可调电源用。
拍的不是很仔细,大家将就着看。
第一次发图文,又不懂的大家尽管提。
今天翻出来的两个电源模块,现场拆回来的旧的,很脏但没坏。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
懒得画了,从网上找到的电路图。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
以上电路基本和手里的模块电路相同,大家可以参考下,对比手上的模块。
可以看出这个电路比atx的简洁,没有需要大面积拆除的部分。
有我们需要的恒流恒压控制环路,不需要刻画pcb。
整体改造顺利的话半天就可搞定。
首先先肢解模块,我拆的比较彻底实际只要能取出电路就可以了。
因为是就模块,需要清洗和涂硅脂,所以就拆散了。
第一个模块是带风扇的,风扇已经废了。
开上盖。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
俯视内部,灰尘遍布。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
取出电路板后的躯壳。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
取出的电路板,大家拆到这里就好了。
模块的特征已经很明显,两个功率管,两个高压电容,一个主变,还有一个驱动变压器,当然还有tl494。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
电路板反面。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
后面,注意保护绝缘垫。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
接线端子,最左侧的电位器是微调输出的。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
功率三极管,两个。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
主变,肖特基,滤波电感,输出电容。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
再拆另一个,先拆掉右边的那颗螺丝。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
端子排旁边还有一颗。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
向左一推,就能拿下来了。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
这个相对干净些,同样的两个高压电容,两个功率管,一个控制变压器,tl494芯片。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
拆下外壳外边剩余的螺丝。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
即可取出电路板。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
看到额外的散热片了没,比带风扇的那个强。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
同样端子排旁边有个微调电位器。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
右下角的就是tl494,除此之外没有别的芯片。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
固定功率管的螺丝,拆。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
背面还带绝缘膜,不错!
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
去掉看看。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
再近点看看,大面积的铺铜是功率输出部分。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
拆除散热片。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
功率管近照。左边是高压电容,图中间是控制变压器,右边是tl494。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
高压电容和电压转换开关,不出国的话直接把开关拆掉就好。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
输入滤波部分。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
tl494特写。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
肖特基特写。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
暂时用不到的外壳和螺丝,堆一起。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
杂乱的工作台,必须收拾下了,没有地方下手了。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
先去给电路板洗澡,回来再收拾战场。
洗完澡的电路板,干净多了。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
等待电路板干燥的时候收拾下战场。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
干净多了吧!
顺便晒晒家当。
万用表,没有一个好表笔。在厂里用,不想掏自己钱买。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
利利普示波器,注意看波形。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
这里干扰很大,旁边就是高压室,毛刺很多。
红丝的是一通道,探头已短接,毛刺是平板电源的,为此测试时要关掉它。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
平板和可调电源,还有元件库。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
看我的元件库,纸隔板胡的,分类存放。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
里面用自封袋储存。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
食堂的盒饭,赞一个,只要五块钱。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
第一步:去掉自启动电阻。
为什么要去掉自启动电阻呢?
因为这个电源上电时,高压部分会产生微弱的自激震荡,次级感应出一定能量。
达到tl494启动门限时,tl494接管控制为它激可控,使输出受控。
这个震荡对我们来说无用,且有害。
在tl494未启动之前或是关闭后,电源处于非控自激状态,输出不受控制。
图中红圈标记的就是。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
在电源里找到功率三极管的c极(一般为中间脚),会看到连接有一个二极管一个电阻。
这个电阻一般就为启动电阻,它直接或间接连到三极管b极。
有的地方是一个电阻,有的用两个电阻串联,以分摊功耗和压降。
对应模块到里面。
拆启动电阻前元件面,图中1/2w的电阻就是。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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背面pcb走线。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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拆出来的电阻和拆除后的电路板。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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另一个模块拆前元件面。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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背面pcb走线。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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拆出的电阻和拆除后的电路板。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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2014-6-21 19:45 上传
这个电阻一般为300k,如果有两个就是150k每个。
拆除后加电,模块不能启动就对了。
第二步:拆除tl494原供电电路。
启动电路拆除后原供电电路也就没用了,拆之。
如果不拆也可以工作,只是tl494工作电压变化,可能会有参数变化。
原供电电路为了保证启动顺利和可靠控制选取的工作电压一般较高,约20v左右且随负载变化。
红圈内的二极管既是。
黄圈内的电阻有的是在电容和二极管之间,需要拆除。
有的是在图中位置,需要用导线短接。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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对应线路板二极管一般在主变附近,只连接辅助绕组和一个低压电容的小肖特基。
元件面,输出电抗旁边的二极管就是。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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电路板背面连线,这一个辅助绕组没有走主变接线柱。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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拆除后。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
拆除的东西放到原位。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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拆除的电阻需短接。
另一个模块元件面,隐藏在主变下面。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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背面走线。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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换个方向看。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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拆除后,这个电路原电阻位就是短接线。
![图解十步开关电源模块改可调](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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拆除的原件放回原处。
![图解十步教你把普通开关电源模块改可调压电源](https://i0.wp.com/www.yleee.com.cn/shop/wp-content/themes/sage/themer/assets/images/lazy.png?ssl=1)
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