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IGBT Overcurrent Detector

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Alexsgarage

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IGBTs can be damaged by overcurrent conditions such as: ground fault and line-to-line short. To prevent these from damaging the IGBT there is an overcurrent protection circuit that shuts down the transistor if such fault conditions occur.

How are these devices designed?
How can I integrate one of these devices into my IGBT driver circuit?

My IGBTs (HGTG30N60B3D) can withstand a short circuit for about 10 µs, so the device will have to have a fast response time.
The IGBTs will be used to switch 120V, to protect the overcurrent detector diodes will clamp the voltage within safe limits.

Any help will be greatly appreciated, thanks in advance.
 

tcmtech

Banned
Most Helpful Member
I think you are most likely looking for one of these or one of its many cousins.
 

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Alexsgarage

New Member
Yes, that would work nicely, but I have already designed gate drive circuits and bought the components to build them, I am looking for a circuit that can just be added on to my existing drivers without much modification. Something that could monitor current at the collector and emitter leads of the IGBT and send a signal up to the shutdown pin on my SG3524 PWM in the event of an overcurrent condition.
 

smanches

New Member
Put a sense resistor after the source of the IGBT, and measure the voltage drop across it. This is how most of the overcurrent protection schemes work.
 
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