EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Davis on March 16, 2016, 03:09:03 pm
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Hi everybody,
Recently, i am working on a DC-AC inverter design using an IPM Module (PS22A78--MITSUBISHI).
Unfortuately, during debugging test, all the lower bridges or all the IGBTS would be damaged unexcepted without any sign.
My scheme is as the same as the recommended circuit in the datasheet of PS22A78.
After a few days detection, i found that the control supply i designed had a little huge nosie about 3~4V voltage ripple as the attachments shows.
So i doubt the case over-voltage of the control supply might occur.
As the datasheet indicated, the IPM has a function of "under-voltage protection for control supply".
However there is no cautions about what if the case over-voltage of the control supply occurred.
So I don't know whether it is the root cause which is over-voltage happened that damage the IPM or not.
If u have any suggestions, pls feel free to let me know.
I'll preciate it if u could share any idea. Thank you a lot.