Title:
POWER SUPPLY EQUIPMENT
Document Type and Number:
Japanese Patent JP3410611
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide power supply equipment which prevents abnormal boosting of a voltage impressed on a components, prevents thereby breakdown of the component and enhances safety.
SOLUTION: An electrolytic capacitor C2 is connected between output terminals of a full-wave rectifier circuit DB with a high-speed diode D1 and a load circuit L interposed. A series circuit of a diode D2 and FET Q1 is connected to the opposite ends of the electrolytic capacitor C2. Besides, a choke coil L2 is connected between the node of the high-speed diode D1 and the load circuit L and the node of the diode D2 and the FET Q1. Since a booster chopper operation and a step-down chopper operation are conducted in combination only in the case when a voltage VL is equal to a difference between a voltage Vc2 and the absolute value &verbar VIN&verbar of a voltage VIN (VL=VC2-&verbar VIN&verbar ) at the time of ON/OFF of the FET Q), a period when the booster chopper operation is conducted is vanishes or becomes short in the case when the impedance of the load, circuit L is small, and thus abnormal boosting of the voltage Vc2 is prevented.
Inventors:
Hiroshi Iwahori
Application Number:
JP23825696A
Publication Date:
May 26, 2003
Filing Date:
September 09, 1996
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
H05B41/282; H02M3/155; H02M7/48; (IPC1-7): H02M3/155; H05B41/282
Domestic Patent References:
| JP59129583A | ||||
| JP6225538A | ||||
| JP374091A | ||||
| JP6245530A |
Attorney, Agent or Firm:
Keisei Nishikawa (1 person outside)
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