Switching power source device of the type capable of...

Details Switching power source device of the type capable of... Switching power source device of the type capable of...

2004-06-28

2008-05-13

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S089000, C363S127000

Reexamination Certificate

active

07372710

ABSTRACT:
A switching power source device is provided which comprises a secondary MOS-FET9connected between a secondary winding6of a transformer2, a reactor11connected in parallel to secondary winding6of transformer2for accumulating energy during the on-period of primary MOS-FET4, and a secondary control circuit12connected to reactor11and a control terminal of secondary MOS-FET9. Secondary control circuit12serves to turn secondary MOS-FET9off to accumulate energy in reactor11, turn secondary MOS-FET9on to discharge energy accumulated in reactor11, and turn secondary MOS-FET9off upon completion of energy release from reactor11.As secondary control circuit12turns secondary MOS-FET9on and off in response to the periods for accumulating and discharging energy in reactor11, the device can perform the efficient synchronous rectification operation of secondary MOS-FET9even under the fluctuating condition of input and output voltages E, VOand control of power loss in output voltage VOproduced from secondary winding6of transformer2.

REFERENCES:
patent: 6791849 (2004-09-01), Nakayama
patent: 7212416 (2007-05-01), Kyono
patent: 2003/0193820 (2003-10-01), Nakayama
patent: 7-245943 (1995-09-01), None
patent: 8-317639 (1996-11-01), None
patent: 9-215325 (1997-08-01), None
patent: 9-312972 (1997-12-01), None

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