Title:
SWITCHING POWER SUPPLY UNIT
Document Type and Number:
Japanese Patent JP3475904
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the efficiency of an RCC-type switching power supply unit by reducing its oscillation frequency in standby state.
SOLUTION: In the RCC-type switching power supply unit, MOSFET 4 is connected with the primary side of a transformer 1, and the MOSFET 4 is brought into self-excited oscillation by the output voltage of a bias winding 8. A rectifying and smoothing circuit 10 is connected with the bias winding 8. The power supply unit is provided with a mode selection circuit 11 that is turned on or off depending on whether the rectifying and smoothing voltage is not less than a certain voltage, and a turn-on delay circuit 12 that, when the mode selection circuit detects the smoothing output voltage being less than the certain voltage, delays the output voltage of the bias winding 8 and outputs it to the control terminal of the MOSFET 4.
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| JPS58151867 | BIDIRECTIONAL 4-QUADRANT POWER CONVERTER |
Inventors:
Teruo Nishida
Hiroshi Takemura
Hiroshi Takemura
Application Number:
JP2000115690A
Publication Date:
December 10, 2003
Filing Date:
April 17, 2000
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H02M3/28; H02M3/338; H02J1/00; (IPC1-7): H02M3/28; H02J1/00; H02M3/338
Domestic Patent References:
| JP11313483A | ||||
| JP11235036A | ||||
| JP2000245149A | ||||
| JP200145759A | ||||
| JP2001268905A | ||||
| JP6261190U |
Attorney, Agent or Firm:
Hisao Komori