krunal2411
Newbie level 3
Hello all,
Good day!
I am new to this forum thus please pardon me if I make any mistake while asking my question.
I have been trying to make a small VFD (variable frequency drive).
I have used STGP19NC60KD IGBTs for the purpose and using IRS2109S for driving the gate.
I am driving the IGBT with a PWM frequency of 8KHz.
It works well when no load is connected and I can see the required output.
When I connected a motor, the motor ran for 5 seconds, and then the first set of IGBT(high & low side) which is used for driving phase R got burnt, and its driver IC is also damaged.
When I checked at IGBT terminals, I see that its gate and collector is short-circuited.
I replaced the IGBT and again tried, but it still burnt the same IGBT.
In first attempt, it burnt both high and low side IGBTs and all the resistors and zener diode.
In the second attempt, it burnt High side IGBT only and driver IC.
Also all the resistor on both high/low sides and zener diode were also damaged.
I have tried searching a lot but couldn't find anyone with the same problem.
I see that Collector-Emitter or Drain-Source short circuit is a common problem, but in my case, gate-Collector is short circuit and I can't find any explanation for it.
I have also attached the schematic of one of the IGBT path.
I really appreciate any help to show me the direction of the problem.
Thanking You all.
Good day!
I am new to this forum thus please pardon me if I make any mistake while asking my question.
I have been trying to make a small VFD (variable frequency drive).
I have used STGP19NC60KD IGBTs for the purpose and using IRS2109S for driving the gate.
I am driving the IGBT with a PWM frequency of 8KHz.
It works well when no load is connected and I can see the required output.
When I connected a motor, the motor ran for 5 seconds, and then the first set of IGBT(high & low side) which is used for driving phase R got burnt, and its driver IC is also damaged.
When I checked at IGBT terminals, I see that its gate and collector is short-circuited.
I replaced the IGBT and again tried, but it still burnt the same IGBT.
In first attempt, it burnt both high and low side IGBTs and all the resistors and zener diode.
In the second attempt, it burnt High side IGBT only and driver IC.
Also all the resistor on both high/low sides and zener diode were also damaged.
I have tried searching a lot but couldn't find anyone with the same problem.
I see that Collector-Emitter or Drain-Source short circuit is a common problem, but in my case, gate-Collector is short circuit and I can't find any explanation for it.
I have also attached the schematic of one of the IGBT path.
I really appreciate any help to show me the direction of the problem.
Thanking You all.