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SSTC MOSFET over heating? Answered

The following images shows my SSTC work, it is based on steve wards mini SSTC. But the problem is that the MOSFETs seem to heat up in like 3-4 sec of running. Input voltage is 220v AC(rectified and filtered later using a SMPS line filter).

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and turned off just as fast. Losses occur at both the leading AND trailing edges...

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iceng

3 years ago

I think I see your heatsinks in the second to last pic,

Are you using heatsink thermal transfer grease

to pass the FET heat to the Al ??

Otherwise the heatsink does not work