Switching power supply circuit providing reduced power loss upon

Details Switching power supply circuit providing reduced power loss upon Switching power supply circuit providing reduced power loss upon

1993-06-08

1994-08-23

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 15, H02M 3335, H02M 322, H02J 100

Patent

active

053412796

ABSTRACT:
A switching power supply circuit includes a DC/DC converter, a control circuit, a first auxiliary power supply circuit, and a second auxiliary power supply circuit. The DC/DC converter has a transistor for switching a DC input voltage. The control circuit controls the ON/OFF time of the transistor to keep a DC output voltage from the DC/DC converter constant. The first auxiliary power supply circuit supplies power to the control circuit during a normal switching operation period of the transistor. The second auxiliary power supply circuit supplies power to the control circuit when a DC input voltage is applied to the switching power supply circuit. The second auxiliary power supply circuit is controlled by an output voltage from the first auxiliary power supply circuit to stop the supply of power.

REFERENCES:
patent: 5034871 (1991-07-01), Okamoto et al.
patent: 5267136 (1993-11-01), Suga et al.

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