Title:
SWITCHING POWER SOURCE DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/034325
Kind Code:
A1
Abstract:
A switching power source device includes: a synchronization/rectification MOS-FET (9) connected between a secondary winding (6) of a transformer (2) and output terminals (7, 8); a reactor (11) connected in parallel to the secondary winding (6) of the transformer (2) and accumulating energy when a main MOS-FET (4) is ON; and a synchronization/rectification control circuit (12) connected to the reactor (11) and a control terminal of the synchronization/rectification MOS-FET (9). The synchronization/rectification control circuit (12) turns the synchronization/rectification MOS-FET (9) OFF so as to accumulate energy in the reactor (11) and turns it ON so as to release the accumulated energy. When the release is complete, the MOS-FET (9) is switched from ON to OFF. Since the synchronization/rectification MOS-FET (9) is controlled to turn ON and OFF in accordance with the energy accumulation period and release period of the reactor (11), it is possible to effectively perform synchronization/rectification operation and suppress power loss even when the input voltage (E) and the output voltage (VO) are varied.
Inventors:
KYONO YOICHI (JP)
Application Number:
PCT/JP2004/009115
Publication Date:
April 14, 2005
Filing Date:
June 28, 2004
Export Citation:
Assignee:
SANKEN ELECTRIC CO LTD (JP)
KYONO YOICHI (JP)
KYONO YOICHI (JP)
International Classes:
H02M3/335; (IPC1-7): H02M3/28
Foreign References:
| JPH07245943A | 1995-09-19 | |||
| JPH09215325A | 1997-08-15 | |||
| JPH08317639A | 1996-11-29 | |||
| JPH09312972A | 1997-12-02 |
Attorney, Agent or Firm:
Shimizu, Keiichi (3rd Floor YK Nakameguro Building, 1-5,
Nakameguro 3-chom, Meguro-ku Tokyo 61, JP)
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