Title:
SWITCHING POWER SUPPLY CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2005/015724
Kind Code:
A1
Abstract:
A complex resonance type converter having a sync rectifier circuit exhibits a high power conversion efficiency, while having a reduced circuit scale because of its simplified circuit arrangement and being able to be manufactured at a low cost. In order to realize such a complex resonance type converter, a sync rectifier circuit of a winding voltage detection system is provided on the secondary side of the complex resonance type converter; the gap length of an insulating converter transformer (PIT) is set to the order of 1.5 mm; the coupling coefficient thereof is set to as small as the order of 0.8; and the turns number of a primary winding (N1) and those of secondary windings (N2A,N2B) are set such that the induced-voltage level per turn (T) of the secondary windings will be 2V/T. As a result, the magnetic flux density of the core of the insulating converter transformer (PIT) is below a predetermined value, so that the rectified current on the secondary winding side can be placed in a continuous mode even under a heavy-load condition.
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Inventors:
YASUMURA MASAYUKI (JP)
Application Number:
PCT/JP2004/011561
Publication Date:
February 17, 2005
Filing Date:
August 05, 2004
Export Citation:
Assignee:
SONY CORP (JP)
YASUMURA MASAYUKI (JP)
YASUMURA MASAYUKI (JP)
International Classes:
H01F3/14; H02M3/28; H01F27/32; H02M3/335; H02M3/337; H01F29/02; (IPC1-7): H02M3/28
Foreign References:
| JP2002262568A | 2002-09-13 | |||
| JP2002218748A | 2002-08-02 | |||
| JP2002095248A | 2002-03-29 |
Other References:
See also references of EP 1548922A4
Attorney, Agent or Firm:
Inamoto, Yoshio (11-18 Nishi-Shinjuku 7-chom, Shinjuku-ku Tokyo 23, JP)
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