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Patent Searching and Data


Title:
MULTIPLE POWER SUPPLY, AND METHOD AND APPARATUS FOR OVERCURRENT PROTECTION OF MULTIPLE POWER SUPPLY
Document Type and Number:
WIPO Patent Application WO/2002/075909
Kind Code:
A1
Abstract:
A multiple power supply device is provided in which a switching circuit (12) controls input current (I) flowing to the primary of a transformer, and a plurality of output circuits (21-25) provided in the secondary of the transformer produce output. The multiple power supply device comprises a protection circuit (311) for stopping a switching circuit (12) in response to an input current (I) exceeding a maximum input level, a voltage detector circuit (313) for detecting the voltage of at least one output circuit (24) provided on the secondary side, a differentiator circuit connected to the voltage detector circuit (313) to detect the change in the voltage of other output circuits (21-23) provided on the secondary side (315), and a control circuit (312) for operating the protection circuit (311) if the voltage detected by the voltage detector circuit (313) is lower than a threshold.

Inventors:
TANAKA HIROYA (JP)
Application Number:
PCT/JP2001/002201
Publication Date:
September 26, 2002
Filing Date:
March 19, 2001
Export Citation:
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Assignee:
FUJITSU LTD (JP)
FUJITSU PERIPHERALS LTD (JP)
TANAKA HIROYA (JP)
International Classes:
H02M3/335; H02M1/00; (IPC1-7): H02M3/28
Foreign References:
JPH09121537A1997-05-06
JPH077870A1995-01-10
JPH08331843A1996-12-13
Attorney, Agent or Firm:
Kubo, Yukio (Nishinakajima 7-chome Yodogawa-ku Osaka-shi, Osaka, JP)
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