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Mosfet burst out at line voltage - what is the problem

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Nimish

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mosfet burst

I replaced mosfet irfp460 with irfbc30 having 600v 3.6A rating, 200nf with 1uf capacitor and diodes with mur160.I added TLP optos between MCU and IR2111.
I gave 24V dc to the power dc rail and connected 24V lamps in star .GND signal of logic circuit was connected to negative dc rail.The lamps glows well.

So I opted to give 325DC voltage to the power dc rail at this time there was no load.The mosfet bursts out.The ciruit works well with 24V DC and bursts out at line voltage so what is the problem.

Should I connect the logic ground to the power dc rail negative terminal. Are the voltage rating of the mosfet adequate.
 

Re: Mosfet burst out

Should I connect the logic ground to the power dc rail negative terminal. Are the voltage rating of the mosfet adequate.
Click to expand...
You should do according to IRF application circuit. In your circuit shown in the previous thread, the connection is actually missing. I wonder how it can work at all.

Generally, I would verify gate drive waveforms, before applying DC bus voltage to the circuit. Using a current limited suppply initially would be another option. However, it doesn't help with missing driver supply ground connection, cause the low side transistors are most likely immediately damaged by gate overvoltage.
 

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