Recker039
Junior Member level 1

Hello everyone,
I have designed a contactor driver circuit that operates in two modes:
When operating at voltages between 110V and 180V, the MOSFET does not burn. However, above 180V, the MOSFET burns immediately when I switch on the circuit.
Some colleagues suggested:
Components used:
Thank you!
I have designed a contactor driver circuit that operates in two modes:
- It initially provides an inrush current (limited) to the contactor coil to engage it.
- Immediately after engagement, it supplies a constant holding current of approximately 50mA.
- For the 95A contactor, it engages with an initial current of 3.5A.
- For the 265A contactor, it requires approximately 6.5A to engage.
When operating at voltages between 110V and 180V, the MOSFET does not burn. However, above 180V, the MOSFET burns immediately when I switch on the circuit.
Some colleagues suggested:
- Increasing the gate resistance
- Adding an RCD snubber in parallel with the existing snubber
Components used:
- MOSFET: STP30N65M5
- IGBT (tested but same result): FGH60N60SMD
Thank you!