RCC SWITCHING POWER SUPPLY - SHINDENGEN ELECTRIC MFG

Title:

RCC SWITCHING POWER SUPPLY

Document Type and Number:

WIPO Patent Application WO/1997/045948

Kind Code:

A1

Abstract:

A RCC switching power is turned on/off repeatedly by a main switching means (9) to supply a switching current to a primary winding (31) and an energy is transferred from the primary side to the secondary side by flyback operation. A circuit composed of a series connection of a snubber capacitor (7) in a snubber circuit (5a to 5c) and an auxiliary switching means (3) is connected in parallel to the primary winding (31). When the auxiliary switching means (3) is closed by an auxiliary winding (4) while the main switching means (9) is opened, the auxiliary switching means (3) performs a third quadrant operation in which the snubber capacitor (7) is charged by the energy stored in the leakage inductance component of the primary winding (31) and then performs a first quadrant operation in which the snubber capacitor (7) is discharged to supply a current to the primary winding (31). By the current, the energy is transferred to the secondary winding side (32) or a smoothing capacitor (21) on the primary side is charged and the energy is transferred to a primary side rectifying/smoothing means (18). As a surge voltage is not applied to the main switching means (9) and the energy stored in the leakage inductance component is not wasted, a low noise and high efficiency RCC switching power supply (2a to 2c) is obtained.

Inventors:

SHIMAMURA TAKASHI (JP)

Application Number:

PCT/JP1997/001235

Publication Date:

December 04, 1997

Filing Date:

April 10, 1997

Export Citation:

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Assignee:

SHINDENGEN ELECTRIC MFG (JP)
SHIMAMURA TAKASHI (JP)

International Classes:

H02M1/00; H02M3/28; H02M3/335; H02M3/338; (IPC1-7): H02M3/338

Foreign References:

JPH04101663A	1992-04-03
JPH0583934A	1993-04-02
JPH04344167A	1992-11-30
JPH0670491U	1994-09-30

Other References: