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12V监控电源带载掉压,空载正常,换了全套滤波和整流还是不行,

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本帖最后由 u1615278 于 2026-11-10 15:08 编辑

12V 5A的监控电源板,带载能力极差。空载测输出12.1V,接上一个12V小灯泡(大概2A),电压直接掉到 9.5V。如果再带个摄像头,直接断电保护。
我已经换了以下元件,还是不行:

主开关管(10N60)换了新的。

次级整流肖特基管(SB2040)换了。

输出端四个25V 470uF滤波电容全换了高频低阻的。

前级300V大电容测了,容量正常。

吸收回路(RCD)的二极管和瓷片电容(102/1kV)也都换了。
现在测主控芯片(OB2269)的VCC供电,带载时一直在9V-12V之间跳变,好像是在打嗝保护。请问大佬们,这是不是变压器内部匝间短路了?或者光耦(817)和431反馈环路有暗病
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