Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1995-06-06
1997-06-03
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 93, 361 98, 257355, H02H 300
Patent
active
056360975
ABSTRACT:
A circuit is provided for protecting against an increase in collector current for an integrated circuit containing a power switching device. The power device drives an inductive load connected to a power supply, and is connected to a control circuit for switching the power device on and off. The protection circuit contains a clamping circuit for deactivating the control circuit and switching the power device off when the current flowing through the power device reaches a preset maximum value. In addition, a circuit is provided for inhibiting the operation of the clamping circuit for a preset time interval after the power device has been switched on, and for keeping the clamping circuit in operation during voltage undershoots caused by the inductive load following the switching of the powered device off.
REFERENCES:
patent: 4562454 (1985-12-01), Schultz et al.
patent: 4721869 (1988-01-01), Okado
patent: 4937697 (1990-06-01), Edwards et al.
Siemens forshungs-Und Entwicklungsberichte, vol. 17, 1988 Berlin Germany, pp. 27-34, G. Miller, APorst, H. Strack, "SIRET .RTM., a 1000v Bipolar Transistor with no Two-Dimensional Parasitic Effects".
Palara Sergio
Sueri Stefano
Consorzio Per la Ricerca Sulla Microelettronica
Gaffin Jeffrey A.
Medley Sally C.
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