Start-up apparatus for power converters

Details Start-up apparatus for power converters Start-up apparatus for power converters

2007-08-14

2007-08-14

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S020000, C363S049000, C323S901000

Reexamination Certificate

active

11226272

ABSTRACT:
A start-up apparatus for a power supply is presented. A charging path from an input voltage to a holding capacitor is cut off after the power converter starts up. The start-up apparatus includes a transistor having a drain supplied with the input voltage, and a source connected to the holding capacitor and an input of a start-up control unit. An output of the start-up control unit controls a switch and the transistor. The holding capacitor starts to be charged as the transistor is turned on. Once a voltage across the holding capacitor exceeds a start-up voltage, an internal control circuit is powered via the switch. Meanwhile, the transistor is turned off and the charging path is cut off. Furthermore, the start-up apparatus provides a hysteresis threshold voltage range for controlling the power converter.

REFERENCES:
patent: 5602724 (1997-02-01), Balakrishnan
patent: 6865093 (2005-03-01), Disney
patent: 7061780 (2006-06-01), Yang et al.
patent: 7075802 (2006-07-01), Yamashita
patent: 7102900 (2006-09-01), Disney
patent: 7116564 (2006-10-01), Takahashi

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