protecting from EMF? Answered
so i am working on some high power geophysical transmitters which are being damaged by back emf.
can anyone help me with what would be the best way to protect the instrument from this.
we are mainly blowing the switching IGBT's.
the transmitter is supplied DC from a 30kw powersupply, feeding a set of IGBT's which are switched at a selected frequency usually 0.5 to 2hz at 50% duty cycle into a loop of wire ranging in resistance but usually around 1 ohm. we run this at up to 150A at 150V and our loads can be very inductive, usually 300mx300m 25sqmm copper wire.
im thinking diodes or caps for a bit of protection.
im open to any ideas