Apparatus for protecting a transistor in the event of a shorted

Details Apparatus for protecting a transistor in the event of a shorted Apparatus for protecting a transistor in the event of a shorted

1987-12-21

1989-03-28

Leung, Philip H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 91, 361 93, 330298, 330207P, H02H 387

Patent

active

048169633

ABSTRACT:
A transistor is protected from excessive power dissipation in the event of a shorted load condition by alternately turning the transistor off for a relatively long period of time during which a capacitor is discharged through a resistor network and turning the transistor on for a relatively short period of time during which the capacitor is charged through a diode by the voltage developed across a resistor connected in circuit with the transistor.

REFERENCES:
patent: 4497010 (1985-01-01), Funahashi
patent: 4581551 (1986-04-01), Campbell, Jr.
patent: 4651252 (1987-03-01), Babinski
patent: 4669026 (1987-05-01), Wedlar
patent: 4736267 (1988-04-01), Karlman et al.

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