Motor controller with bi-modal turnoff circuits

Details Motor controller with bi-modal turnoff circuits Motor controller with bi-modal turnoff circuits

1991-09-06

1992-12-22

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 98, H02H 7122

Patent

active

051738481

ABSTRACT:
The motor controller of the present invention includes a power bus, an insulated gate bipolar power transistor and a control circuit. The direct current power bus provided a source and sink of current to be conducted to and from a controller motor. The insulated gate bipolar power transistor selectively conducts transistor current to and from the motor. The control circuit among other things determines power gate timing of the power transistor and the manner in which the insulated gate bipolar transistor conducts and ceases to conduct transistor current to or from the motor. The control circuitry includes a current bias circuit for selectively supplying a turn on voltage and turn off voltage to the power transistor, a slow resistor connects the bias circuit turn off voltage to the power gate of the power transistor to cause the power transistor to slowly cease conducting, a switchable FET for selectively conducting the bias circuit turn off voltage to the power gate through a fast mode circuit which bypasses the slow resistor, and a sensing selection circuit for sensing whether the power transistor is conducting transistor current at a normal level and if the transistor current is normal causing the switchable FET to conduct the turn off voltage and turn off the power gate through the fast mode circuit bypassing the slow resistor.

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