Title:
LOW POWER STAND-BY FOR SWITCHED-MODE POWER SUPPLY CIRCUIT WITH BURST MODE OPERATION
Document Type and Number:
WIPO Patent Application WO1999007062
Kind Code:
A3
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 switchably 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.
Inventors:
MAJID NAVEED
MOBERS TOM
SEINEN ERWIN G R
MOBERS TOM
SEINEN ERWIN G R
Application Number:
PCT/IB1998/001138
Publication Date:
April 29, 1999
Filing Date:
July 27, 1998
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS SVENSKA AB (SE)
PHILIPS SVENSKA AB (SE)
International Classes:
H02M3/28; H02M3/335; (IPC1-7): H02M3/10; H02M3/156
Domestic Patent References:
| WO1996031940A1 | 1996-10-10 |
Foreign References:
| EP0744819A1 | 1996-11-27 | |||
| US4688159A | 1987-08-18 |
Download PDF: