 |  | | | | 先排除死区不够导致直通引起的炸管，其他任何原因放后。
|
|
|
|
|
| | |  | | | | | | | | 炸管： 可分为多种情况： 死区 小直通炸管。 桥臂相位错误炸管， 开机过流炸管（输出端短路，变压器短路）， 过温炸管， 等等。
区分： 空载，上电瞬间炸管，原因有 桥臂直通， 和过流。 1 多半是电路桥臂相位错误直通， 2 变压器短路输出短路引起过流短路。3驱动信号不正常。
过温炸管：开机瞬间是不会炸的， 在负载情况下，几分钟以上时间后的事情。
调试检查步骤： 1 检查核对，桥臂驱动波形的信号， 相位，变压器电感量， PCB管脚 直观检测 是否正常。
2 对电流保护采样设置值降低，（初级电流保护或输出电流保护）2000W电路，初级必须有过流保护，取最小电流保护值，，
3 空载上电，检测波形， 观察空载损耗也是作为参考， 是否正常。不正常，及时关机， 回1步， 直到正常。
4， 开机正常后，检测输出电压，带1A 电流，2A 电流观察，计算效率， 正常情况下效率高才对。 带载到最小电流保护值时， 观察保护后的输出电压限流请况， 电流保护是否实现目的要求。。测试波形， 等等。
5上面都正常，才放开保护电流到额定值， 测试每段功率负载的工作情况。
|
|
|
| | | | | | | | | | | | | 驱动信号应该没有什么问题过热的可能性也没有（炸后立马断电用手去摸大概30度，用红外测的是35度左右）变压器次级短路的可能性也较低（有没有可能时磁饱和造成的？频率27.5-28.5K 输出串有1UF隔直电容）现在发现每次炸的时候DS波形很乱（这个和变压器的电感量有关？变压器的电感量主要影响什么？）！
|
|
|
|
| | | | | | |  | | | | | | | | | | 多谢前辈，DS波形和变压器输入波形上下跳动，稍微加大负载DS波形就很乱前辈推测可能为什么原因？
|
|
|
|
|
| | | | | | | | | | | | | 死区明确，排除直通风险。现怀疑副边BUCK电感有诈，饱和？高导磁芯？根本没有？抑或其附加电路引起短路？
|
|
|
| | | | | | | | | | | | | | | 就是普通全桥 输出变压器直接带负载没有其他附加电路
|
|
|
| | | | | | | | | | | | | | | 应该和磁芯关系不太大，就是全桥输出悬空不接变压器 也有炸管几率 经过反复测试发现只要DS波形出现严重震荡就会炸管（震荡和输入滤波电容值大小有一定关系）另外板子布局原因也可以排除
|
|
|
| | | | | | | | | | | | | | |
这是变压器次级波形（变压器空载）带载尖峰更大直至震荡导致上下管直通 |
|
|
| | | | | | | | | | | | | | | | | 普通全桥，副边整流后应该有Buck电感，直接带载就是短路，炸管很正常。问题就是它了
|
|
|
| | | | | | | | | | | | | | | | | | | 谢谢老师回答 副变没有整流 交流输出的，我这个副边电压波形怎么会有个尖呢？
|
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | 你这样不对，负载又是电感又是电容，成了个二阶谐振结构，很容易发飙炸管
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 超声波电源的基本思路是：电源变换器与超声波换能器固有频率谐振
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 一会电感，一会电容，一会超声波，一会纯阻，还是不知道你副边电路如何 |
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 现在副边电路就是输出变压器直接加在加热棒上（纯电阻）可是现在原边电压波形上下跳动
原边电压波形.rar
(1.58 MB, 下载次数: 0)
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
老师GS并联二极管为18V TVS 隔直电容为6UF 频率为28K
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 电路上保护环节都没有，反馈环是怎么样？ 难度就这样开环的吗？
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 还是没看见你说的副边电路，你说的电感呢？电容呢？超声波呢？纯阻呢？加热棒是啥？
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 等同于400W的纯电阻（加热棒） ，没敢用超声波直接测试（功率有2000W）用超声波测试的时候是要串电感的，这个超声波输出是不需要电容的，就这么一个简单回路就可以了，现在下管DS波形幅值上下跳！！加大负载波形很乱
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你既然非要这样调试，那么你可以原边直接用纯阻带载，把变压器（甚至C9也）拿掉调，如果还有异常，再议
|
|
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 接不接C7都试了一下波形一样，开关管开通速度也不快，G极电阻从3R到50R都试了一下影响不大，考虑是布线问题后来刮去PCB的铜换做铜条引出了还是这个样子，开关管也换了也不行，另外驱动波形不加强电也没有任何问题
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 现在把C7接到这里，每对管子都接一个，不惜代价接成最小回路：
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 怎么能彻底去掉这个上冲和下冲呢（那个电容从0.1-2.2UF都试了一遍波形基本差不多）？还有DS波形幅值为什么会上下波动呢？
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 容量474吧，不是加一个，两个桥都加，不是随便加，而是要焊在MOS根部，线还不能长，最短路径
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你好老师，加了以后波形有较大改善，但是不能空载启动了，空载启动瞬间就过流保护了(可能上下直通)，带载启动没有问题，这是为什么呢？
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 输入串个2KW的电炉，然后空载启动观察8楼死区（从启动第一个波形开始的）波形有没有异常，
可以从芯片发波、驱动输出、驱动变压器输入、驱动变压器输出（下管）、VGS（下管）、VDS（下管）逐个观察，
异常是指电压（有否超过20V）和死区（有否消失），并观察C6\C12对异常的影响，必要时修改驱动电路。
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 版主老师请看 换了驱动变压器的电容 2UF换成1UF 对波形影响不大
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | （从启动第一个波形开始的）波形，你不是空载开机炸机吗？ |
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 不炸的时候就是这个波形 我在做测试 看看炸的时候能不能捕捉到波形 但是加大负载就开始震荡什么原因呢，
|
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 先解决空载启动炸机的问题，需要完成抓启动第一个波形，按62楼做，其余问题再议
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 发现新问题，烧管子的时候肯能先烧的驱动
这个是烧管子的波形 |
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Vgs电压超过20V，时间超过50u，（即使是串电炉）炸机是必然的。应该是电路问题。在每个MOS的GS都放一个15V齐纳再测。
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你好 老师，GS有18V双向TVS,带轻载的时候就没有问题 为什么空载（带变压器空载GS和DS有很大尖峰开机几次就烧了，不带变压器全桥完全空载开机一次马上驱动烧了）不行呢
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 原来以为烧掉的驱动在断电后重新上电 驱动居然没有问题，可以用 但是功率管不串电炉的话肯定烧毁，原来烧掉的功率管都是GDS直通
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 大概率是VGS过压引起的烧毁，TVS用15V的吧，同时取消四只驱动二极管，适当加大驱动电阻（33R吧），继续完成62楼的测试，才能知道为什么
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你好 老师，现在TVS换做13V的了二极管也去了，电阻换做33R可是空载开机还是不行，分析可能的原因是：：DS剧烈震荡耦合至GS进而耦合至驱动变压器原边导致MCU和DDS（3895时钟端由DDS控制频率）工作不稳定，现在测得每次炸管时都是由于DDS突然停止输出（3895以600HZ输出频率）导致，现在主要需解决问题是DS震荡问题发现负载大小对DS波形影响非常大这是为什么？另外我的负载时从100W升到2000W在降到100W来回扫动工作的，
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 从之前的调试看，你的PCB很烂，单片机很敏感，被干扰是必然的，这是根本原因，看来这个板是调试不出来了。
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 主要原因是空载尖峰很大导致，为什么加一个小负载尖峰就会减小或消失但是负载加大DS波形非常不对称，这是为什么呢？我知道原理了才好改嘛
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | VDS问题45楼已经解决，现在是85楼，这40楼你是瞎忙了
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 不是呀老师，加上电容尖峰去掉了但是去掉尖峰后剩余的部分怎么办呀？而且电流越大振荡越厉害
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 这个震荡是变压器漏感和MOS的寄生电容引起的吗？老师
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 这不确定，也不重要，它在死区里，不出力，也可能是你在DS上乱加东西引起的
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 没有乱加东西呀，就每个桥臂并了个电容 现在200W就成这样了 我的要求功率2000W呢
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 嗯嗯 按照45楼的示意图并的， 为什么电流越大 震荡越厉害呢？
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 不是震荡啊？？那我明天直接上2000W负载试一下 再次感谢老师
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 太莫名其妙了 今天上午测试 突然GS短路了（还是接的200W电阻负载） 按理说接了13V 双向TVS啊（驱动电阻5.1R GS并了102电容） 怎么还会击穿GS啊 MOS管是GS短路DS没有问题！！！！！！！！！开关电源太难弄了 你们都是怎么做到现在这个程度的啊 ， 太难了
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 因为你驱动芯片VCC电压太高，也不稳，还因为你单片机电压不稳，或者受干扰，欠压复位，引起驱动发飙。
说了33R你5.1，TVS也扛不住，说了不能乱接东西你并个102，完全是乱搞，肯定还有更多蛮干的事，不炸机才怪
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 版主老师 说的是， 驱动芯片VCC电压才12V呀，单片机供电也稳定 切用模块电源供电的 示波器也量不出来干扰纹波呀
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 嗯嗯，只是稍微加大负载波形就那样了（切越大越厉害一直不敢上2000W负载 只是用100-400W的电阻丝试） 看着害怕啊，不是震荡那时什么呢？老师
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 什么都不是，不该担心的事。应该担心的是你的驱动电压为啥飙到20V以上，导通时间为啥飙到50uS以上，单片机为啥会复位，空载为啥会炸机，Vds波形没有振荡的部分为啥不是矩形？最高电平为啥才60V？还不对称？
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 是的，电压没有动过，一直150V测试的， 不敢加到220
这次测的变压器次级波形 加负载到200W死区那个尖就大了许多，
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 我是问：空载时调压器还是150V？这很可能是空载炸机的原因
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 是啊 空载调压器是150V 一直都是150V测试的 带载和空载都是150V？这有什么问题吗？
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 哦哦 多谢 多谢 明天我用万用表测一下看看空载电压多少
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 黄色是啥？如果是Vgs，100多V了，一定会炸机
消除那些波动很容易，你把死区减少到接近0，它就没有了，但更容易炸机
|
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你把线路板从新画一次吧，这块板调不出来的。我特意用3895芯片搞了一下，负载500W。波形是这样的，黄色是电流波形，青色是主变电压波形。
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你的 波形为什么这么好 有没有加吸收电路呢？多谢万工
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 多谢 万工了， 你的波形为什么这么好，有没有加吸收电路？也是变压器驱动吗？ |
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
带载后就没有这些尖峰了 但是带载越大刚才和您说的那个死区的尖越大 |
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 你好 老师现在主要问题 就是死区那个震荡了 那个震荡耦合至G极有可能导致误开通，经过测试这个震荡可能是输出变压器和某个电容震荡 （不是DS电容我测试时在功率管DS并联电容频率不变只有改变变压器电感量时频率会变）
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 负载应该是：他激式超声波换能器，容抗负载。 要与开关电源的输出高频变压器的输出阻抗进行匹配。 之间要串联阻抗匹配网络才可以，L，C，R网络。
反馈环可以在输出阻抗匹配L上用电流互感器取电流信号进行功率电流限制。
楼主的电路图不全。
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 这个我知道 要串联匹配电感的 其他不需要 你说的匹配LCR的可能是焊接电路那个确实要匹配的 我这个不需要匹配电容只要串联电感就可以了，
老师我现在问的是开关电源的问题 现在的电路就是上图那个样子 变压器输出副边只加了一个阻性负载（400W）DS波形就变动很乱减小负载波形会变好但是幅值上下波动，起初怀疑输入滤波电容小 现在加到1500UF还是这个样子
|
|
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | 哦 现在老烧输出变压器测的桥臂（输出一端隔直电容一端变压器）怎么回事呢？漏感太大？
|
|
|
| | | | | | | | | 4US 时什么概念， 不能这样认知， 1个开关周期时多少US ，死区占多少占空比。 一般死区设置为10%时间。我一直怀疑3895移相芯片不适合做硬开关全桥， 芯片内部 机制不一样。494, 3525 这些老式芯片都非常成熟，为什么不用。
|
|
|
|
|
|
| | | | | | | | | | | | | | | | | 这个不常用， 你可以打个试试。同步时钟，就是在时钟脚输入时钟频率， PWM输出一致频率。超声波电源，也要电流限制环路。 还可以补偿超声波震子的频率漂移，就是通过这个时钟脚做文章。
|
|
|
| | | | | | | | | | | | | | | | | | | 嗯嗯 谢谢前辈 现在DS波形还是搞不定
按照 nc965版主的建议每个桥臂都并了个2.2NF的电容 但是没有任何改变，如果不加高压驱动波形是正常的，不太可能是驱动引起的
|
|
|
| | | | | | | | | | | | | | | | | | | | | 你先把输出接整流滤波，像往常的开关电源一样，调试看看。区分开路是前 还是后的问题。从波形上看，现在应该是最大占空比的开环状态。
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | 现在把这个电容增大到0.1UF-2UF波形就成了第50楼的波形了 前辈你看怎么去掉这个上冲和下冲呢 还有DS波形幅值为什么会上波动呢？ |
|
|
| | | | | | | | | | | | | | | | | | | | | 驱动波形有振铃，是探棒没测好，还是驱动到MOSFET管之间的线没处理好？还有电流波形还是要看看的。
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | 驱动到MOS的线很短基本就是驱动电阻挨着G极引脚，会不会是DS震荡耦合过来的 现在每个桥臂并联了0.1U的电容波形如50楼！麻烦看一下有没有办法彻底去掉这个上冲和下冲
|
|
|
| | | | | | | | | | | | | | | | | | | | | | | | | 是3895芯片？不知道在硬开关能不能用。3846,3525用得熟。关键要看看电流波形，就知道是怎么回事。（GS并联二极管为18V TVS）是双向的吗？ |
|
|
|
|
|
|
|
| | | | | | | | | 做口罩焊接机呀？ 要不换成纯电阻负载试试看波形是什么样子的 电路都没有参数值得呀 |
|
|
|
|
|
收藏
分享
津公网安备 12010402000296号