In the below mentioned circuit which is used for automotive EMR braking. We are facing freewheeling diode burn out (FR607 is currently being used).
We are still clueless about the cause. But as per design this is a 6 A rated diode with surge value of 300 A which according to my design team is well enough. But we suspect that this ampere rated diode is not OK. We need to find the maximum freeweeling current in this circuit. How to calculate this current value. The coil resistance is 0.8 amps. Load of the circuit is 30 amps and the supply is a 24 V DC battery source 200 Ah.