System and method for improving efficiency of a power factor...

Electricity: power supply or regulation systems – Output level responsive – Zero switching

Reexamination Certificate

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C363S021030

Reexamination Certificate

active

07994758

ABSTRACT:
A power supply device comprises a driver circuit, a transistor switch, and a first transistor. The driver circuit is configured to provide a stable driving signal and a floating driving signal. The transistor switch has a first terminal, a second terminal connected to a first terminal of the driver circuit, and a third terminal connected to a second terminal of the driver circuit, and is configured to prevent a reverse current based on the floating driving signal. The first transistor has a first current electrode connected to the first terminal of the transistor switch, a second current electrode connected to the first voltage reference, and a control electrode connected to the third terminal of the driver circuit, and is configured to activate and deactivate based on the stable driving signal, and further configured to regulate an input voltage to a substantially constant direct current output voltage.

REFERENCES:
patent: 6680629 (2004-01-01), Rankin et al.
patent: 7093048 (2006-08-01), Bobbitt et al.
patent: 2007/0085515 (2007-04-01), Nishida
patent: 2007/0257647 (2007-11-01), Chen et al.
patent: 2009/0128111 (2009-05-01), Chang Chien
patent: 2009/0302814 (2009-12-01), Kapels et al.
U.S. Appl. No. 11/970,977, filed Jan. 8, 2008.

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