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My original post still seems correct, they are for suppressing transients from the diodes and have little to do with the MOSFETS.But normally we have snubber connected across drain and source, right? How they are working in the attached image? Are they enough for these 4 mosfet's?
That isn't what the schematic shows and I can't see a sensible way of configuring it that way.Actually the transformer primary has 3 terminals, One terminal is connected to the +ve side of battery,the other two terminals are connected to the mosfet which are switching according to the PWM they get.
--> overvoltage spikes.I don't know the reason.
What are the current and voltages involved?
Alternatively you may connect the snubbers across each MOSFETOn the power bus of the MOSFETs
Should i use larger value of Capacitor maybe 1uF?Presently the bridge is switching against 0.47 uF capacitor C5 which is an incredible bad idea. If this is the real circuit, it's not surprising that the MOSFETs fail frequently.
Look sharp, it's just a regular bridge rectifier.The transformer must be center trapped else there is no return path for the current.