초록 ▼

A simple, off-chip circuit and method for endowing high efficiency IGBTs with short-circuit capability, that is essentially transparent to the user. The invention involves adding an external common emitter resistor to reduce the effective gain of an IGBT under short circuit. Under normal operating c

A simple, off-chip circuit and method for endowing high efficiency IGBTs with short-circuit capability, that is essentially transparent to the user. The invention involves adding an external common emitter resistor to reduce the effective gain of an IGBT under short circuit. Under normal operating conditions, the voltage across the resistor is small, such that the modifying effect on the normal operating gate-emitter voltage is almost negligible.

대표청구항 ▼

[ What is claimed is:] [1.] A circuit for protecting a high efficiency IGBT in a motor controller circuit, said motor controller circuit including a three-phase inverter for motor control with six high efficiency IGBTs, three of said IGBTs on a high side and three of said IGBTs on a low side, said c

[ What is claimed is:] [1.] A circuit for protecting a high efficiency IGBT in a motor controller circuit, said motor controller circuit including a three-phase inverter for motor control with six high efficiency IGBTs, three of said IGBTs on a high side and three of said IGBTs on a low side, said circuit comprising a common emitter resistor provided in series with each emitter of three of said high efficiency IGBTs for (i) increasing the short-circuit capability of the IGBTs by reducing the effective gain of the IGBTs under short circuit conditions; and (ii) not being used to produce a sensed voltage for a current control circuit.