The lightning protection board of the power supply is burned, how to analyze it

Knight97538 · Published on 2022-11-22 08:58

The lightning protection board of the power supply is burned, how to analyze it [Copy link]

The copper foil of the lightning circuit board of a high-power power supply exploded and fell off. It is used in a dust-proof site, and the environment is relatively harsh. The user input power is a generator, and the input voltage is unstable. Is it caused by excessive du/dt?
Listen to the discussion and analysis of the teachers

zhangdaoyu · Published on 2022-11-22 12:07

Is this a solder pad that has fallen off? The board is too dirty to tell which part has the problem.

Gen_X · Published on 2022-11-22 16:03

It looks like the pad has burned off from the photo. If so, it should be that the pad functions as a via lead. For vias that may have large currents or large pulses, multiple vias should be used to increase the current passing through, especially for pads that do not contain components. The pad holes have no solder and components, and the current passing through is very limited, making them easy to burn off.

Knight97538 · Published on 2022-11-22 21:10

zhangdaoyu posted on 2022-11-22 12:07 Is this a solder pad that has fallen off? The board is too dirty, so I can't tell which part has a problem

There are a lot of dirt and dust, which is somewhat related to this

Thanks for the analysis

Knight97538 · Published on 2022-11-22 21:12

zhangdaoyu posted on 2022-11-22 12:07 Is this a solder pad that has fallen off? The board is too dirty, so I can't tell which part has a problem

Is the safety distance shortened for internal dust?

吾妻思萌 · Published on 2022-11-23 15:15

Creepage short circuit? Should I blow the fuse? If the board is burned, I'm afraid I'll have to replace it.

Knight97538 · Published on 2022-11-24 08:29

Azuma Simeng posted on 2022-11-23 15:15 Creepage short circuit? Should I burn the fuse? If the board is burned, I'm afraid I have to replace it~

You don't quite understand

Blown fuse?

吾妻思萌 · Published on 2022-11-24 09:03

Azuma Simeng posted on 2022-11-23 15:15 Creepage short circuit? Should I burn the fuse? If the board is burned, I'm afraid I have to replace it~
You don't quite understand what you said, burn the fuse?

Is there no fuse on this board?

The lightning protection board of the power supply is burned, how to analyze it [Copy link]

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