Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1992-09-01
1994-01-25
DeBoer, Todd
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 86, 323274, 363 56, H02H 7122
Patent
active
052821072
ABSTRACT:
An embodiment of the present invention is a switching power supply that includes a full-wave bridge rectifier to rectify incoming AC line voltage, a transformer having a primary winding and two secondary windings and a switched mode power supply chip that includes an integrated high voltage power MOSFET with a low voltage tap in the drift region. The MOSFET controls power switching of the primary winding of the transformer and has a high voltage present during initial power-up. This high voltage is dropped across the JFET part of the MOSFET and supplies a safe operating area protection circuit with a low voltage signal that will shut-off the MOSFET if the current passing through the MOSFET produces a voltage drop at the tap that exceeds a predetermined maximum.
REFERENCES:
patent: 4893158 (1990-01-01), Mihara et al.
patent: 5086364 (1992-02-01), Leipold et al.
patent: 5164659 (1992-11-01), Schultz et al.
DeBoer Todd
Power Integrations, Inc.
Schatzel Thomas E.
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