SWITCHING POWER SUPPLY APPARATUS - SANKEN ELECTRIC CO LTD

Title:

SWITCHING POWER SUPPLY APPARATUS

Document Type and Number:

WIPO Patent Application WO/2005/034324

Kind Code:

A1

Abstract:

A switching power supply apparatus has a main switch (Q1) connected to a DC power supply (1) via a primary winding (N1). A smoothing capacitor (C₀) is connected to a secondary winding (N2) via a sync rectifying element (Q2), which comprising a parallel circuit of a sync rectifying semiconductor switch (8) and a diode (D0). In order to render the sync rectifying semiconductor switch (8) ON during ON-state of the diode (D0), there are provided an ON-period deciding capacitor (C1), a charging diode (D1), a resistor (R1), a discharging resistor (R2), switch state signal detecting means (11), and logic circuit means (20). The logic circuit means (20) can precisely establish the ON-period of the sync rectifying semiconductor switch (8).

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Inventors:

KYONO YOICHI (JP)

Application Number:

PCT/JP2004/014075

Publication Date:

April 14, 2005

Filing Date:

September 27, 2004

Export Citation:

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Assignee:

SANKEN ELECTRIC CO LTD (JP)
KYONO YOICHI (JP)

International Classes:

H02M3/335; (IPC1-7): H02M3/28

Foreign References:

JP2001346379A	2001-12-14
JPH09163736A	1997-06-20
JP2000023456A	2000-01-21
JPH11341799A	1999-12-10
JPH11332226A	1999-11-30

Attorney, Agent or Firm:

Takano, Noritsugu (5-8 Hyakunincho 2-chom, Shinjuku-ku Tokyo 73, JP)

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