After the power supply common mode surge protection, the power supply output voltage rises instead of falling

东野a

After the power supply common mode surge protection, the power supply output voltage rises instead of falling [Copy link]

 

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A simple power supply mainly consists of a PFC boost after a rectifier bridge, and then a BUCK step-down output. During surge simulation, the output voltage of the front-stage protection circuit is several hundred V lower than the output voltage of the rear-stage circuit. The protection device has been placed before the rectifier bridge. Will the rear-stage PFC inductor and Y capacitor also resonate and boost the voltage?

okhxyyo

Has the landlord's problem been solved?

东野a

okhxyyo posted on 2022-11-4 16:04 Has the original poster's problem been solved?

Not yet.

qwqwqw2088

Will the post-stage PFC inductor and Y capacitor also resonate and boost the voltage? It's hard to say.

Have the protective devices been placed before the rectifier bridge?

The specific type of protective device placed

okhxyyo

I sent you a few heroes. I will reply to you when I have time.

东野a

qwqwqw2088 posted on 2022-11-4 16:30 Will the post-stage PFC inductor and Y capacitor also resonate and boost the voltage? It’s hard to say. Has the protective device been placed before the rectifier bridge? What kind of protective device is placed specifically...

The varistor and discharge tube were placed, and the primary protection that should have been placed before the common-mode inductor was placed after the common-mode inductor. I'm sorry I've been busy and my reply is slow.

东野a

okhxyyo posted on 2022-11-4 18:06 I sent it to a few heroes. I will get back to you when I have time

OK, thank you very much.

未成追忆

Waiting for someone to solve this problem.