Circuit for overvoltage protection

Details Circuit for overvoltage protection Circuit for overvoltage protection

1990-02-26

1992-07-14

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 18, 307 64, H02H 902

Patent

active

051308835

ABSTRACT:
In a circuit for overvoltage protection of a low voltage device (11) arranged to control a load (12) an energy storage capacitor (17) is connected to charge from supply (+V) while the device is controlled from a control circuit (100). During overvoltage, the controller is disconnected by switch means (15) and capacitor connected by switch means (16, 18) across the device to maintain it in an on state so that overvoltage device damage is prevented. The circuit is suited to transitory overvoltage conditions such as automotive load dump and to integration with the controlled device.

REFERENCES:
patent: 3609504 (1971-09-01), Barker et al.
patent: 3746962 (1973-07-01), Wright
patent: 3801895 (1974-04-01), Kanngiesser
patent: 4495536 (1985-01-01), Bynum
patent: 4679112 (1987-07-01), Craig
patent: 4703388 (1987-10-01), Ruhnau
patent: 4787008 (1988-11-01), Graff et al.
patent: 4860152 (1989-08-01), Osborn
patent: 4893211 (1990-01-01), Bynum et al.
patent: 5010439 (1991-04-01), Zisa et al.
Motorola Technical Developments, vol. 9, Aug. 1989, "High Side Driver FET Load-Dump Protection" by John Qualich, pp. 62 and 63.

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