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How to use the two varistors in the power surge control circuit to prevent surges?

Hardware design
11월 19, 2020 by Yasmin 425

I would like to ask everyone, should the Rv2 in the picture of the brother be placed behind or in front of the rectifier, so that the anti-surge effect is good? In the figure, RV1 uses the same specifications (diameter, voltage) in parallel.

Anti-surge requirements of 1500V don't know if it can pass?

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Anahi 게시 날짜 November 19, 2020

This is of course put in front.

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Cyrus 게시 날짜 November 19, 2020

Place the varistor on the front and the AC terminal;


Can it pass 1500V, and can't rely entirely on varistor;

In addition, the 7D511 used is a bit larger, and the varistor at the back should be smaller than the previous one;

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Yasmine 게시 날짜 November 19, 2020

The varistor RV2 should be placed in front of the rectifier bridge. The selection of varistor MOV1 is 14D511K, and MOV2 can be 7D511K.

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Leyla 게시 날짜 November 19, 2020

It is best to put it in front of the input terminal.

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Lilia 게시 날짜 November 19, 2020

Is the surge test level 1500V? I only know that there are 500V, 1000V, 2000V, 4000V, or higher (manufacturer self-determined), of course these are all differential modes. If your circuit is grounded, you should also consider a common-mode surge test for grounding.

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