A latched up IGBT can be turned off by

A latched-up IGBT cannot be turned off by simply removing the gate voltage. When an IGBT enters into latch-up, it essentially acts like a short circuit between the collector and emitter terminals due to the parasitic thyristor structure inherent in its design being turned on. This condition can lead to high current flow and potential damage to the device if not promptly addressed.

To turn off a latched-up IGBT, the excessive current flowing through the device needs to be reduced below the holding current of the parasitic thyristor. This can often mean interrupting the power supply to reduce the current to a level where the device can safely return to its non-conducting state. In some cases, where applicable, an external circuit breaker or fast-acting fuse in the circuit can help protect the IGBT by cutting off the supply when excessive currents are detected.

In practical applications, it’s essential to design the circuitry and select appropriate IGBTs to minimize the risk of latch-up. This involves understanding the switching conditions, thermal management practices, and potentially using circuit protection devices or strategies to mitigate risks.