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Topic Title: H bridge problem
Topic Summary: High voltage H bridge problem
Created On: 27 April 2010 07:55 PM
Status: Read Only
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 27 April 2010 07:55 PM
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zhassan11

Posts: 10
Joined: 23 February 2010

Dear all

I designed DC to AC converter (12v DC to 700v AC) the H bridge has four 1kv mosfet. the output is 700v 15mA.

The problem that i have is when i apply load across the H bridge 1kV spike will appear on top of the 700v.

the 1kv is not more than 5us, so the vcc will be over 1700 volts.

I am wondering whether anyone knows how i can get rid of this 1kv extra?

and will the 5us 1kv will damage the mosfet?

i am thinking this 5us 1kv has a very small amount of energy and i dont think this will effect the mosfet. am i right or wrong any suggestions?

thanks,
Zahra
 28 April 2010 10:12 AM
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westonpa

Posts: 1771
Joined: 10 October 2007

http://www.richieburnett.co.uk/mosfail.html

Design in some suppression.

Regards.
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