Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1986-07-31
1987-07-07
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 84, 361 91, 361111, 322 28, 318430, 318459, H02H 709, H02H 318
Patent
active
046791124
ABSTRACT:
A protection circuit for the power transistor of an automotive motor control circuit. The protection circuit comprises a protection transistor, a resistor, and a Zener diode. The emitter-collector circuit of the protection transistor is connected in series with the resistor across the primary conduction path of the power transistor, with the resistor connected across the conduction control terminals of the power transistor. The Zener diode is connected in series with the emitter-base circuit of the protection transistor across the motor, with the Zener diode poled to oppose current flow through the emitter-base circuit. Transient inductive voltage generated across the motor upon removal of an externally applied control signal exceeds the reverse breakdown threshold of the Zener diode and biases the protection transistor conductive. The protection transistor, in turn, directs current through the resistor to develop a bias voltage which biases the power transistor into a partially conductive state for slowly dissipating the inductive transient. Source voltage transients due to load dump conditions are ineffective to bias the power transistor conductive.
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Deboer Todd E.
General Motors Corporation
Navarre Mark A.
Pellinen A. D.
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