return back after I run the motor on, by convert it from series to separately excited by applying about 1.5V to it's Rf and variable voltage at Ra and it's working well.
now I build a driver for a gate of MOSFET from 5V to 12V and generate PWM to this driver to control the speed of motor by changing the voltage at Ra. the mosfet driver will switching 110 Volt to Ra, when I applied 12V or 24V no problem but when I applied 110V to MOSFET(IRF640) It's damaged and it's the second one I don't know why since this mosfet is capable to handle 200V , 18A.
So I need to make 110V driver can handle this voltage and current , anyone can helo me ? I attached the schematic
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