Deterioration detecting apparatus and deterioration detecting method

Patent metadata

Field	Value
Publication number	US-9864013-B2
Application number	US-201615053242-A
Country	US
Kind code	B2
Filing date	Feb 25, 2016
Priority date	Feb 27, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A deterioration detecting apparatus includes: a capacitor that is connected to an insulated electric power source, and is charged and discharged; a voltage detecting unit that detects a voltage of the capacitor; and a deterioration detecting unit that detects a deterioration in an insulating resistor of the electric power source on the basis of the voltage of the capacitor charged through a charging path for detecting a deterioration in the insulating resistor of the electric power source, and the voltage of the capacitor during discharging.

First claim

What is claimed is:

1. A deterioration detecting apparatus comprising:
a capacitor that is connected to an insulated electric power source, and is charged and discharged;
a voltage detecting unit that detects a voltage of the capacitor; and
a deterioration detecting unit that detects a deterioration in an insulating resistor of the electric power source on the basis of the voltage of the capacitor charged through a charging path for detecting the deterioration in the insulating resistor of the electric power source, and the voltage of the capacitor during discharging, wherein the deterioration detecting unit:
includes a discharge rate calculating unit that calculates a discharge rate of the capacitor on the basis of the voltage of the capacitor charged, and the voltage of the capacitor discharged for a predetermined time after charging of the capacitor;
detects the deterioration in the insulating resistor of the electric power source on the basis of the voltage of the charged capacitor and the discharge rate; and
in a case where the voltage of the charged capacitor is equal to or greater than a predetermined threshold value, and the discharge rate is within a predetermined range, the deterioration detecting unit detects the deterioration in the insulating resistor of the electric power source.

2. The deterioration detecting apparatus according to claim 1 , wherein:
in a case where the voltage of the charged capacitor is less than a predetermined threshold value, and the discharge rate is out of the predetermined range, the deterioration detecting unit detects a deterioration in elements including the capacitor positioned on a discharging path, and determines that there is no deterioration in the insulating resistor of the electric power source.

3. The deterioration detecting apparatus according to claim 1 , wherein:
in a case where the voltage of the charged capacitor is equal to or greater than a predetermined threshold value, and the discharge rate is out of a predetermined range, the deterioration detecting unit:
corrects the voltage of the capacitor detected by the voltage detecting unit, or the threshold value, and
uses the corrected capacitor voltage or the corrected threshold value to detect the deterioration in the insulating resistor of the electric power source.

4. A deterioration detecting apparatus comprising:
a capacitor that is connected to an insulated electric power source, and is charged and discharged;
a voltage detecting unit that detects a voltage of the capacitor; and
a deterioration detecting unit that detects a deterioration in an insulating resistor of the electric power source on the basis of the voltage of the capacitor charged through a charging path for detecting the deterioration in the insulating resistor of the electric power source, and the voltage of the capacitor during discharging, wherein the deterioration detecting unit:
includes a discharge rate calculating unit that calculates a discharge rate of the capacitor on the basis of the voltage of the capacitor charged, and the voltage of the capacitor discharged for a predetermined time after charging of the capacitor;
detects the deterioration in the insulating resistor of the electric power source on the basis of the voltage of the charged capacitor and the discharge rate; and
in a case where the voltage of the charged capacitor is equal to or greater than a predetermined threshold value, and the discharge rate is out of a predetermined range, the deterioration detecting unit:
corrects the voltage of the capacitor detected by the voltage detecting unit, or the threshold value, and
uses the corrected capacitor voltage or the corrected threshold value to detect the deterioration in the insulating resistor of the electric power source.

5. A deterioration detecting method comprising:
detecting a voltage of a capacitor which is connected to an insulated electric power source and is charged and discharged;
calculating a discharge rate of the capacitor on the basis of the voltage of the capacitor charged, and the voltage of the capacitor discharged for a predetermined time after charging of the capacitor; and
detecting a deterioration in an insulating resistor of the electric power source on the basis of the voltage of the capacitor charged through a charging path for detecting the deterioration in the insulating resistor of the electric power source, and the voltage of the capacitor during discharging, wherein
in the detecting, the deterioration in the insulating resistor of the electric power source is detected on the basis of the voltage of the charged capacitor and the discharge rate, and
in a case where the voltage of the charged capacitor is equal to or greater than a predetermined threshold value, and the discharge rate is within a predetermined range, the deterioration in the insulating resistor of the electric power source is detected in the detecting.

Assignees

• Fujitsu Ten Ltd

Inventors

• Kawanaka Shota

Classifications

• G01R31/64

  Testing of capacitors · CPC title

• G01R27/025

  Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters · CPC title

• G01R31/385 Primary

  Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382) · CPC title

• G01R31/3627 Primary

  Physics · mapped topic

• G01R31/028

  Physics · mapped topic