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Title:
SWITCHING POWER SUPPLY APPARATUS
Document Type and Number:
WIPO Patent Application WO/2005/053140
Kind Code:
A1
Abstract:
The present invention realizes a small-sized transformer and a switch that exhibits a zero voltage switching, thereby achieving a size reduction, an enhanced efficiency and a noise reduction. There are included a series circuit connected across a DC power supply (Vdc1) and comprising a primary winding (5a) of a transformer (T) and a main switch (Q1); a rectifying/smoothing circuit for rectifying/smoothing a voltage developed across a secondary winding (5b) when the main switch (Q1) is turned on; a series circuit connected across the primary winding (5a) and comprising an auxiliary switch (Q2) and a clamp capacitor (C1); a series circuit connected across the primary winding (5a) and comprising an auxiliary reactor (Lx), a diode (Dx1) and a snubber capacitor (Cx); a series circuit connected across the auxiliary switch (Q2) and comprising a diode (Dx2) and the snubber capacitor (Cx); and a control circuit (10) for alternately turning on and off the main switch (Q1) and auxiliary switch (Q2). During on-state of the main switch (Q1), the snubber capacitor (Cx) is charged. During off-state of the main switch (Q1), the snubber capacitor (Cx) is discharged into the clamp capacitor (C1), thereby gentling the slope of a voltage rise of the main switch (Q1).

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Inventors:
TSURUYA MAMORU (JP)
Application Number:
PCT/JP2004/015713
Publication Date:
June 09, 2005
Filing Date:
October 22, 2004
Export Citation:
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Assignee:
SANKEN ELECTRIC CO LTD (JP)
TSURUYA MAMORU (JP)
International Classes:
H01F27/24; H01F27/28; H01F30/00; H02M3/28; H02M3/335; (IPC1-7): H02M3/28
Foreign References:
JPH09312973A1997-12-02
JPH11289763A1999-10-19
JP2000184710A2000-06-30
Attorney, Agent or Firm:
Miyoshi, Hidekazu (Toranomon 1-chome Minato-ku, Tokyo, JP)
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