Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1997-12-08
2000-02-01
Paladini, Albert W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 915, 361101, H02H 504
Patent
active
060210370
ABSTRACT:
A device (1) for supplying electric power to a load (4) connected to the device (1) in a power-on mode comprises a driver stage (7), a control unit (9), adapted to supply turn-on pulses to the driver stage (7), and an output stage (12) with a switching transistor (1) which can be driven into its conductive state for a time interval (T.sub.EIN) by the driver stage (7) in the power-on mode when turn-on pulses occur, and which can be driven into its non-conductive state after expiry of the time interval (T.sub.EIN), the driver stage (7) being also adapted to monitor the operating temperature (T.sub.S) of the switching transistor (11) and to activate a power-off mode when the operating temperature (T.sub.S) of the switching transistor (11) exceeds a first limit temperature (T.sub.G1), in which power-off mode the switching transistor (11) is permanently driven into its non-conductive state by the driver stage (7) in spite of the occurrence of turn-on pulses (I.sub.S), the driver state (7) further comprising a sensing transistor (21), a sensing resistor (22), a turn-on transistor (23), a turn-on resistor (24) for monitoring the operating temperature (T.sub.S) of the switching transistor (11), as well as a zener diode (29) and a turn-off stage (32) for obtaining a short switching time of the switching transistor (11), the sensing transistor (21) being arranged so as a to be substantially uninfluenced by the operating temperature (T.sub.S) of the switching transistor (11).
REFERENCES:
patent: 3558987 (1971-01-01), Lewis
patent: 4360852 (1982-11-01), Gilmore
patent: 5099381 (1992-03-01), Wilcox
patent: 5198956 (1993-03-01), Dvorak
patent: 5424897 (1995-06-01), Mietus et al.
Biren Steven R.
Huynh Kim
Paladini Albert W.
U.S. Philips Corporation
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