Power transistor driver circuit with current sensing and current

Details Power transistor driver circuit with current sensing and current Power transistor driver circuit with current sensing and current

1992-08-26

1994-06-28

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 93, 323276, 323277, 363 56, 307571, H02H 326, G05F 1573

Patent

active

053252586

ABSTRACT:
A circuit and method for driving a power transistor device. The circuit for driving a power transistor device has a driver having an input and an output, the output coupled to a control input of the power transistor device and the input coupled to a primary control voltage source for driving the power transistor device. A current sensing device is coupled to the power transistor device for providing a signal proportional to the current in the power transistor device. An amplifier is coupled to the current sensing device for providing a substantially linear control signal proportional to the current in the power transistor device, the linear control signal being provided to the input of the driver as a secondary drive signal for driving the power transistor device when a current level in the power transistor device greater than a threshold level is detected. A detector is provided for detecting when the current in the power transistor device is greater than the threshold level. The detector is coupled to the current sensing device and to a reference level source, and provides an overcurrent signal to the driver for switching the driver from being driven by the primary control voltage source to the secondary drive signal. The secondary drive signal drives the driver so as to reduce the current level in the power transistor device. The driven power transistor device is preferably a power MOSFET or IGBT.

REFERENCES:
patent: 4771357 (1988-09-01), Lorincz et al.
patent: 4896245 (1990-01-01), Qualich
patent: 4937697 (1990-06-01), Edwards et al.
patent: 4992683 (1991-02-01), Robin, Jr.
patent: 5032774 (1991-07-01), Juzswik
patent: 5192906 (1993-03-01), Nathan

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