tomp wrote:
Rich: Here is the schematic of the soft start I have been using for 25 years. Some of the components may have been replaced by newer versions, but the concept is still the same. It first checks the line voltage to make sure it is not too low or high and then starts a phase control circuit to gradually increase the phase angle and thus the power. Once at full phase angle, the phase control circuit is bypassed and turned off to eliminate switching noise.
Tom,
Was going to look at this soon. I am sure it will need it.
Did find some GaN FET's to use as a sub for the Power MOSFET. Have two here to try in the circuit. About the same price and lower losses in the device. Heatsink will be tiny as they can run up to 200C and very efficient.