Title:
直流給電装置
Document Type and Number:
Japanese Patent JP5600546
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a DC power supply device with a grounding detection function capable of exactly and simply detecting which of a positive side power supply line or a negative side power supply line grounding is generated without being influenced by AC components.SOLUTION: A DC power supply device is provided with a voltage ratio calculation circuit and a grounding discrimination circuit. The voltage ratio calculation circuit calculates voltage ratio (Vb/Va) or (Vc/Va) between detected voltage Va between a positive side power supply line and a negative side power supply line and detected voltage Vb or Vc between the power supply line and a grounding potential part of one potential. The grounding discrimination circuit outputs a first grounding detection signal by considering that there is a possibility of generation of the grounding between the positive side power supply line and the grounding potential part when the voltage ratio (Vb/Va) or (Vc/Va) is equal to or more than a grounding determination reference signal X1 or equal to or less than Y1, or outputs a second grounding detection signal by considering that there is a possibility of generation of the grounding between the negative side power supply line and the grounding potential part when the voltage ratio (Vb/Va) or (Vc/Va) is equal to or less than a grounding determination reference signal X2 or equal to or more than Y2.
Inventors:
Kubota 優介
茂籠 潔
Fukui 昭圭
Matsumoto Dawn
茂籠 潔
Fukui 昭圭
Matsumoto Dawn
Application Number:
JP2010225760A
Publication Date:
October 01, 2014
Filing Date:
October 05, 2010
Export Citation:
Assignee:
Origin Electric Co., Ltd.
NTT Facilities, Inc.
NTT Facilities, Inc.
International Classes:
G01R31/02; H02H3/16
Attorney, Agent or Firm:
Shigenori Tada
Masahiro Terada
Masahiro Terada