D类功放制作

yygbs

这3D特效可以去拍电影了

sofar

初步布好线，只差DSP数字电源控制板了。

sofar

继续布线数字电源控制板，即将完成。

默默沉默的默

D类要做好很难吧？

sofar

做好声难，第一版已经正常工作了很久了，频率在550K左右，和我的常规功放比，高音差一些，低音绝对好过常规甲乙类。
功率很大，震坏了我其中的一个音箱。布局布线，要特别注意EMC的问题，EMC做得好，频率容易上去，也成功了一半。

ping3357

实测参数怎么样呢，比如失真度、信噪比、频响等指标。

kangchu888

4020h 并管 2092 驱动能力没问题？

sofar

DSP数字电源控制板完成，PCB设计工作全部完成，发出制版。

农民烧友.

楼主在玩3D秀这么久都不见板子真是急死人

sofar

农民烧友. 发表于 2017-5-28 11:40
楼主在玩3D秀这么久都不见板子真是急死人

第一版不是有成品板子么？

sofar

D类功放和开关电源布线要求较高，不要着急！

sofar

板子终于制作回来了，晚上开始调试。

iWoofer

你这个3D是用Altium做的吗？看起来高逼格。

sofar

iWoofer 发表于 2017-6-30 17:39
你这个3D是用Altium做的吗？看起来高逼格。

是的，很简单

iWoofer

sofar, it's simple if you've a step models for all your parts. Do you make step models by yourself?  
Bing translator: 目前, 这很简单, 如果你有一个步骤模型的所有部分。你自己做阶梯模型吗？

iWoofer

BTW, you've choose bad way to transfer a heat from to-220. At least need to add holes for a screw, between the to-220 pairs. In terms of EMI it's better to keep GND layer with minimum cuts. Also is very important to keep as small as possible a fast current's contours. This two simple rules are golden for the SMPS industry and will save a lot of EMC lab time. Please take a look for an example (attached jpg) of near ideal 2 layers layout for a driver-to-220_mosfets PCB area. All mounting holes should be GND tied directly or thru mlcc, if required (in case of audio just connect it to GND).
Bing translator: 顺便提一下, 你选择了不好的方式来转移 to-220 的热量。至少需要增加螺丝孔, 在 to-220 对之间。在 emi 方面, 最好是保持最低限度的接地层。同样重要的是保持尽可能小的快速电流的轮廓。这两个简单的规则是黄金的开关电源行业, 将节省大量的 emc 实验室时间。请看看一个接近理想的2层布局的 driver-to-220_mosfets pcb 地区的例子。所有安装孔应直接或通过 mlcc, 如果需要 (在音频的情况下, 只是连接到接地)。


补充内容 (2017-6-30 20:50):
PS: I'm sorry, seems I can not attach picture yet, because I've not enough posts.

iWoofer

Sorry again, I very new here, finally I've got a way to attach picture (super low quality, cause 150KB limit). And again nothing! What kinda forum is it?? )))

sofar

iWoofer 发表于 2017-6-30 21:14
Sorry again, I very new here, finally I've got a way to attach picture (super low quality, cause 15 ...

你是来秀E文的？

iWoofer

sofar, please don't be angry, man, I'm not chinese, I'm russian engineer, 9+ years work in china as SMPS/class D designer ;) I can help a lot you and others members, 100% for free, but I've no idea how to use this strange forum yet. My chinese wife is busy so far, when she has time, I'll upload the picture. Actually you may get a clue without picture as well, your to-220 will never parallel enough to the heatsink, hence the thermal interface is poor. Try this link please
I talking about Q11 & Q12 area, this PCBA (or rather almost the same) got CE certification by the first tempt.

audio3721

d类做好了声音不必模拟差，但确实难度大，像2092这类芯片，不解决对于负载阻抗敏感的问题，也是绝难出好声音的，用方波测试空载，8，4欧姆负载，便容易看出问题，希望你能成功。