Synchronous rectifier control using load condition...

Details Synchronous rectifier control using load condition... Synchronous rectifier control using load condition...

2011-05-03

2011-05-03

Sterrett, Jeffrey L (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021140, C363S089000

Reexamination Certificate

active

07936575

ABSTRACT:
In accordance with an embodiment of the present invention, a method of operating a switched power supply is disclosed. The method comprises determining a current load on a secondary side of a transformer by measuring a ratio between a secondary side current conduction time and a primary switching period of the power supply and comparing the current load with a predetermined threshold. A synchronous rectification (SR) MOSFET coupled to the secondary side of the transformer is disabled if the current load is less than the preset threshold.

REFERENCES:
patent: 7636249 (2009-12-01), Hu
patent: 7688602 (2010-03-01), Hu
patent: 2009/0231895 (2009-09-01), Hu
patent: 2009/0268494 (2009-10-01), Hu
patent: 2009/0316441 (2009-12-01), Hu
patent: 2010/0124086 (2010-05-01), Chen
“Synchronous Rectifier Smart Driver for Flyback,” STSR30, STMicroelectronics, 2004, http://www.st.com.

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