Title:
過負荷電流保安装置
Document Type and Number:
Japanese Patent JP3959691
Kind Code:
B2
Abstract:
An overload-current security device has been constituted that comprises a current detection unit for detecting current fed from a power-supply source to a load, wherein the current detection unit comprises the following: a magnetism detection element incorporating a magnetic impedance (MI) effect, an AC-current supply means that adds AC current to the above detection element, a bias-current supply means that supplies bias current to the bias coils, a peak detection means that detects the peak of the varied impedance of the magnetism detection element as the variation in voltage, and switches that respectively select output signals from the peak detection means and are disposed in correspondence with individual phases. In the above current detection unit, holding means that serially hold the switch output and an amplifying means are disposed in common with each of the above component units, thereby enabling detection of the current for each phase and thus expanding the current detectable range and facilitating further lowering of the power consumption and cost.
Inventors:
Takahiro Kudo
Jun Tanaka
Ishikawa
Jun Tanaka
Ishikawa
Application Number:
JP2003535307A
Publication Date:
August 15, 2007
Filing Date:
October 08, 2002
Export Citation:
Assignee:
Fuji Electric Holdings Co., Ltd.
International Classes:
G01R19/165; G01R15/20; H02H1/00; H02H1/06; H02H3/08; H02H7/00; H02H7/085
Domestic Patent References:
| JP2000055996A | ||||
| JP9033257A | ||||
| JP63138258A | ||||
| JP2002247749A | ||||
| JP2002247750A | ||||
| JP2002247751A |
Attorney, Agent or Firm:
Iwao Yamaguchi
Yoshihide Komada
Kiyoshi Matsuzaki
Yoshihide Komada
Kiyoshi Matsuzaki
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