Low power stand-by for switched-mode power supply circuit with b

Details Low power stand-by for switched-mode power supply circuit with b Low power stand-by for switched-mode power supply circuit with b

1997-07-31

1998-09-22

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 19, 363 49, H02M 3335

Patent

active

058123830

ABSTRACT:
A switched-mode power supply circuit having an operating mode and a stand-by mode. The switched-mode power supply circuit includes a transformer and a controllable switch connected to a primary winding of the transformer for switchably connecting the primary winding to a source of d.c. voltage. In the stand-by mode, the switched-mode power supply circuit is arranged to switchable connect the primary winding to the d.c. voltage source in bursts which occur at a low frequency. Between each of the bursts, an auxiliary capacitor, which is ordinarily charged by an auxiliary winding during switching of the controllable switch, is now charged by a start-up current source contained in a controller for controlling the controllable switch.

REFERENCES:
patent: 4688159 (1987-08-01), Marinus
patent: 5353215 (1994-10-01), Dinwiddie et al.
patent: 5453921 (1995-09-01), Shutts
patent: 5689407 (1997-11-01), Marinus et al.
"Mixed Frequency Mode Green PWM Controller", No. MC44603, Motorola Semiconductor Technical Data, pp. 1-30, Feb. 28, 1995.

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