I am switching a similar Kilo A pulse ( <160 uSec @ 120Hz, into a lead acid batt for desulfation) via an NFET bank on the ground rail, perhaps 35VDC peak into the 12V batt from low ESR caps. Spice says i will see a >1KA kickback for 1 uSec (rise & fall) at around 60V (NFet avalanche breakdown). IRLB3036pbf NFETS are used.
The 12V battery model is a 22nF series inductance with a 1.5 F parallel capacitance. Pulse circuit resistance is <15 milli ohms incl NFEts (.001), CAP ESR (.004) and wire losses (.004) and battery int resistance (.005).
The supply is from a rewound MOT delivering about 35VDC @ 10A.
However, the micro controller supply is from another winding, but I planned to ground reference the two supplies after each full wave bridge. I was wondering how best to to handle that spike returning to the pulse winding. Also I am wondering what it might do to the full wave bridge.
Have a look at the sim.