Integrated start-up circuit with reduced power consumption

Details Integrated start-up circuit with reduced power consumption Integrated start-up circuit with reduced power consumption

2005-06-14

2005-06-14

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

With starting arrangement

C363S021100, C363S056010, C323S299000, C323S901000

Reexamination Certificate

active

06906934

ABSTRACT:
A switching power supply control-circuit according to the present invention uses bleeding resistors to charge a start-up capacitor and discharge an EMI filter. No extra discharge device is needed to accelerate the discharge of the input capacitor, since the start-up capacitor is charged up by the AC input source. A latch circuit of the power supply can be quickly reset after the AC input source is shut off. After the control-circuit begins to operate, the auxiliary winding of the transformer will power the control-circuit. To further reduce power consumption, the auxiliary winding generates a bias voltage to enable line-voltage detection. This allows the power supply to perform line-voltage detection and startup, without having to connect resistors or transistors to the input capacitor.

REFERENCES:
patent: 5200886 (1993-04-01), Schwarz et al.
patent: 5262933 (1993-11-01), Shyi-Hon
patent: 5452195 (1995-09-01), Lehr et al.
patent: 6002598 (1999-12-01), Seinen et al.
patent: 6069805 (2000-05-01), Anderson, Jr.
patent: 6295217 (2001-09-01), Yang et al.
patent: 6480402 (2002-11-01), Adragna et al.
patent: 6611439 (2003-08-01), Yang et al.

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