【DIY大赛】+ 反激 + 再次挑战小型高效（已上传AD9原文件）

阅读： 21230 |  回复： 175 楼层直达

挑战小型高效率适配器，这次必须做好，各位前辈多多指教！

11楼已上传PCB原文件，需要的可以下载自行改善，如有更好建议，请多多指教！

沙发被秒抢了

原理图：

设计要求：
输入： AC 90V~264V  47Hz~63Hz
输出： DC  20V  3.25A     OCP：1.05%~1.2%
外形： PCB：73mm*39mm*24mm    外壳：待定
效率： >94% (输入230V时满载)，平均效率 >92.5%(输入230V时)
纹波：<50mV
待机功耗：<0.1W
安规认证

方案如原理 图示，采用准谐振的方式 。 原理图输出极的参数为12V的，做20V需要部分调整。调试后再更新

pcb接近完成，PCB增大了一点

更改部分参数后是否可以输入直流36V——120V？

理论上可以。要调试看看

PCB

底层

继续

直接上传PCB原文件吧，需要的可以下来自行改善。 AD文件，09以上可以打开。

PCB原文件

我等着看菜色,好的话下来玩一个

应该满足不了你，这对你来说只是小菜一碟，

无毒无广告，只加了一句我比较喜欢的话

不知道楼主是用什么样的外壳来做这个电源，应该是金属外壳吧，不然散热应该不够吧？还有设计90-260V大电容的尺寸温度应该受不了，EMC只有一级共模比较难处理吧。

做笔记本桌面式适配器，不用金属外壳的。

温度是绝对可以的，12V输出的已经做成功，EMC余量不大。

那种ABS材质的外壳就可以，温度不会多高

用 PC+abs材质的，外壳就不省那一点了

不知道你说的温度绝对可以为何如此肯定，实际测试的？裸板？带外壳？环境温度多少？一个贴片MOS，你说自己用吧

当然是已经经过验证的了。塑料密封外壳，里面垫一块0.8mm厚的铝片。0-35度的工作环境温度无任何问题。

有何不妥？

铝片多大，怎么垫的，这样安规能过吗？可操作性怎么样，环境温度35度有点低了吧。这种桌面式的客户一般大多都要求使用端子，感觉你做的这个没什么意义，自己玩玩还可以

铝片大半个外壳大，外壳上几个凸点固定。垫上绝缘材料。工艺不复杂。没有十全十美的产品，权衡取舍吧！！

就是自己玩的东西，这不就是DIY吗？什么都按常规做那不如直接拿个产品来算了。

并且没有试过不要那么肯定的否定。

这个设计即使不用金属外壳，底部也是要加铝板散热的。

直接做铝基板可以吗？

那里能看到pcb文件？

看帖11楼，11楼，11楼，最后说一次了，11楼

我AD6.9啊，怎么来个这么高级的跟不上节奏

AD6.9可以打开PCB文件的，我还用99SE，比AD6.9好要老。99SE用惯了。

文件呢？

好吧，11楼

Mark一下，学习学习。

前辈，我怎么没看到PCB附件呢

这个。。。。。。

学习中

你好，为什么我看不到附件？奇怪了。

这共模放电针路太远了 

嗯，请教一下这个放电针怎么设计？怎么选择距离还有用多少个针？

看丝印就可以看出楼主是一个细心之人！

希望不会虚有其表

这个高效率电源，能达到多大的效率？

暂时目标效率板端 >94% (输入230V时满载)，试过才知道，

之前做过12V的最佳效率达到93%

电路图太模糊了；

高清啊。

参数都看得清楚了

版主，12V4A同步MOS有没高性价比的可推荐下，另1792多少￥一颗啊

赛威有颗SF6909，外围只需一颗VCC电容

用XDPS21061吧体积比这做的更小

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大神，PCB文件在哪啊？

11帖，附件

大哥，这个是哪款IC的，可否发个变压器参数参考下？谢谢。2065746683@qq.com

IC请看原理图，变压器请静待后续测试

您好，请教您一个问题，用L6562A+NCP1377B做了一个150W电源，变压器吸收RCD部分很烫，怎么解决？

上图，参数

回复23帖

回复24帖

啥也没有呢

可以减小电容，测一下峰值，权衡取舍

102也试过了，还是很热，有150°

波形怎么样？

电阻值加大呢

总阻值有150K,200K都试过还是很热，你说的波形是什么波形？

頂頂頂。。。。。。。

VDS波形

漏感占比多大？RCD吸收这部分占地方很小？都用贴片的？  耐压多少？

看看能不能把变压器的漏感做小一点

加有源吸收

开始插件

感觉好小啊，如果没有同步整流效率能达到多少

不用同步整流看用什么肖特基，输出12V  65W的话有同步整流跟没有相差2%~3%，用一般的肖特基。

20V输出的话待测。

准谐振的电源是不是PFC会比较高啊。您这电源PFC测得多少啊

不知道你从哪里得出的这个结论。

功率因数定义为 有功功率 / 视在功率，看不出有什么关系。

还有 PFC 是指“功率因数校正”，测试的是 PF值 ，这个要弄清楚。

谢谢版主，我看了下确实没关系

效率多高？

版主能告知一下变压器参数不？啥型号的变压器。

学习学习，学习学习。

PQ2620，参数待调试

什么是准谐振啊？没听说过呢。

这个做的和手机充电器差不多

多谢分享！

输出毛刺大不大，QR波波看看

这是前面一版的波形式

谢谢楼主，板端的输出纹波和毛刺呢？

暂时没有保存有波形，纹波加上杂信没有超过100mV

过冲有点大，在R20并一组RC吸收电路过冲会好点。comp端能有一组RC电路最好了。

求电路原理和PCB，感谢老铁

如资料上所说，准谐振（Quasi-resonant ）有两个作用：

一、减小开关损耗
二、改善EMI

QR的反激相对于普通DCM反激，是因为实现了谷底导通，减小了开通损耗，效率有所提升，减小DV/DT，EMI也更好处理。如上面53楼的实测波形：

黄色VDS波形，满载情况下在第一个谷底开通。

但谷底导通并不是零电位导通，所以效率的提升也有限度，Vor越大，越能发挥QR的优势，但低压输入限制了Vor的选取，。

如下图：Vr 即是Vor，可以看出当以 Vin为中间点，第一个振幅就为 Vor ,所以 Vor 越大，谷底点越低，开通的电压越低，损耗小。

低的输入电压限制了Vor的加大，所以很多QR的方案前面都有使用PFC电路，这样更能发挥QR的优势。

能仔细说说PFC电路为什么能更好的发挥QR的原因吗谢谢

上面说了，低压输入限制了Vor的增大，如果有PFC，把输入电压设置在380~400V左右，这样Vor就可以尽量取大点，这样谷底值更小，导通损耗就小。