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Title:
POWER SUPPLY CIRCUIT AND POWER SUPPLY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2008/023679
Kind Code:
A1
Abstract:
To provide a power supply circuit which can be applied worldwide without using a high withstand voltage switching element and can supply a load device with stable power. A charging section (14) is arranged between a turn-off capacitor (C4) and a load coil (L2). The charging section (14) has the anode connected to the positive terminal of a feedback coil (L3) and the cathode connected to the cathode of a zener diode (Z1). Thus, when a voltage of a commercial power supply (E) is high, the charging section (14) operates, the turn-off capacitor (C4) is quickly charged, an on-period of a transistor (Q1) is shortened, and an excessive voltage is prevented from being applied between the drain and the source of the transistor (Q1). At the same time, an output characteristic indicating relationship between the voltage of the commercial power supply (E) and a current flowing in the load device is permitted to be flat.

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Inventors:
KITAMURA, Hiroyasu (1048, Oaza-Kadoma, Kadoma-sh, Osaka 86, 5718686, JP)
北村 浩康 (〒86 大阪府門真市大字門真１０４８番地松下電工株式会社内 Osaka, 5718686, JP)
YAMASHITA, Mikihiro (1048, Oaza-Kadoma, Kadoma-sh, Osaka 86, 5718686, JP)
Application Number:
JP2007/066150
Publication Date:
February 28, 2008
Filing Date:
August 21, 2007
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS, LTD. (1048, Oaza-Kadoma Kadoma-sh, Osaka 86, 5718686, JP)
松下電工株式会社 (〒86 大阪府門真市大字門真１０４８番地 Osaka, 5718686, JP)
KITAMURA, Hiroyasu (1048, Oaza-Kadoma, Kadoma-sh, Osaka 86, 5718686, JP)
北村 浩康 (〒86 大阪府門真市大字門真１０４８番地松下電工株式会社内 Osaka, 5718686, JP)
International Classes:
H02M3/28; H02M3/338
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (Nichimen Building 2nd Floor, 2-2 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 5300005, JP)
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