Switched mode power supply integrated circuit with start-up self

Details Switched mode power supply integrated circuit with start-up self Switched mode power supply integrated circuit with start-up self

1992-09-01

1994-02-08

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

With starting arrangement

363 21, 363147, 323901, H02M 75375

Patent

active

052853691

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 regulator with power either temporarily or continuously to operate a pulse width modulator in the chip that controls the switching of the MOSFET.

REFERENCES:
patent: 4318168 (1982-03-01), Faxon
patent: 4845605 (1989-07-01), Steigerwald
patent: 5140510 (1992-08-01), Myers

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