Apparatus and method for regulating constant output voltage...

Details Apparatus and method for regulating constant output voltage... Apparatus and method for regulating constant output voltage...

2008-09-16

2010-12-28

Nguyen, Matthew V (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S056010

Reexamination Certificate

active

07859862

ABSTRACT:
A voltage detector circuitry extracts a signal on primary side of a transformer in a flyback converter, which is proportional to the output voltage of the converter without voltage drop on the rectifier diode and leakage inductance effect on the transformer, and good output regulation is achieved without opto-coupler. To accurately detect the output voltage on the primary side, the knee point of the voltage on an auxiliary winding of the transformer is detected. A current limit proportional to the input voltage of the converter is produced from the voltage on an auxiliary winding for stabilizing the output current in constant current mode.

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patent: 6456020 (2002-09-01), Park
patent: 6944034 (2005-09-01), Shteynberg et al.
patent: 7746673 (2010-06-01), Grant et al.
patent: 2007/0121351 (2007-05-01), Zhang et al.
patent: 2010/0157636 (2010-06-01), Li et al.

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