Control electrode disable circuit for power transistor

Details Control electrode disable circuit for power transistor Control electrode disable circuit for power transistor

1992-12-14

1995-05-23

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

363 42, 363 50, H02H 700

Patent

active

054186730

ABSTRACT:
Power transistors used as high-side power switches are typically subjected to a variety of potentially destructive conditions, such as loss of bias current or loss of a ground connection in associated control circuitry. In order to protect the power transistor upon occurrence of such a potentially destructive condition, a control electrode disable circuit is provided to ensure that the power transistor will be turned off upon the occurrence of such a condition, or when the control circuits are deliberately turned off or placed in a standby mode. Turn-off of the power transistor is ensured by shunting a disable transistor across the input of the power transistor, and providing a disable circuit for activating the disable transistor in the event of loss of bias or loss of ground in the control circuitry. Reliable activation of the disable transistor is ensured by a bootstrap capacitor circuit in the disable circuit.

REFERENCES:
patent: 4492883 (1985-01-01), Janutka
patent: 4720641 (1988-01-01), Faini
patent: 4727469 (1988-02-01), Cini et al.
patent: 4890020 (1989-12-01), Bird
patent: 5200879 (1993-04-01), Sasagawa et al.
"Design of a 60V 10-A Intelligent Power Switch Using Standard Cells" Wong et al; IEEE Journal of Solid-State Circuits, vol. 27, No. 3, Mar. 1992.

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