Electronics > Repair

300W inverter repair - problem with H-bridge

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fzabkar:
Here is a similar circuit:

https://elektrotanya.com/vector_vec034d_300w_power_inverter.pdf/download.html#dl

The diodes are 1N4007 and 1N4148.

shakalnokturn:
Thanks fzabkar, I don't see need for any zener here, the bootstrap is supplied from 12V so negative voltage protection.

As for the oscillations and probing method, are you battery powering the inverter for these tests or using a SMPS?
Depending on your setup the oscillations may be the scope's or test SMPS's leakage current and in some cases a good way to pop IRF840's...

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