500 watt smps based inverter

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not able to find that
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this because they are absent ) but then there is TVS (supressors) and chains through which voltage spikes are connected on a + rail.
Certainly, it is possible to use snubbers or that anything else, if You want.
But without oscilloscope or/and detailed scheme possible else to singe much more fets until find reason of the origin to faults.
 
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For snubber, you can start with a set of values and then adjust the values by observing the waveforms using oscilloscope. Trial and error method.

Here's a snubber configuration commonly used (even in commercial inverters):



Hope this helps.
Tahmid.
 
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