In the circuit below L1 is a shunt coil rated at 115 VDC with DC resistance of 300 ohms. I need to use the same coil in an application with wide voltage 130-1000VDC from a bridge rectifier. I will apply a 30 ms pulse to the MOSFET. This means the coil won't see the high voltage for a long time. My thought is that if the pulse is that quickly the coil wouldn't get damaged. I'm thinking now how I choose the rating of the FET and what additional protection I would need to add. What do you think of adding a resistor in series with the coil to share the voltage stress and choose a 800V FET with a TVS diode to clamp some overvoltage between drain and source?
I'd appreciate your suggestions. I'll work on the math to calculate FET peak power.
Possible MOSFET: IPN80R2K0P7ATMA1