# US 2016/0252587 A1 · Deterioration detecting apparatus and deterioration detecting method

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- Number: US 2016/0252587 A1
- Document ID: US20160252587A1
- Status: Published application
- Kind: A1
- Application number: 15/053,242
- Filed: 2016-02-25
- Published: 2016-09-01
- Earliest claimed: 2015-02-27
- Assignees: Fujitsu Ten Limited
- Applicants: Fujitsu Ten Limited
- Inventors: Shota KAWANAKA
- Web page: https://patentgrep.com/patent/US20160252587A1

## CPC

- G01R 31/385: Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382)
- G01R 27/025: {Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters}
- G01R 31/64: Testing of capacitors
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## 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.

## Claims

### Claim 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 a deterioration in the insulating resistor of the electric power source, and the voltage of the capacitor during discharging.

### Claim 2 (depends on 1)

The deterioration detecting apparatus according to claim 1, 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, and
the deterioration detecting unit detects a deterioration in the insulating resistor of the electric power source on the basis of the voltage of the charged capacitor and the discharge rate.

### Claim 3 (depends on 2)

The deterioration detecting apparatus according to claim 2, 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 within a predetermined range, the deterioration detecting unit detects the deterioration in the insulating resistor of the electric power source.

### Claim 4 (depends on 2)

The deterioration detecting apparatus according to claim 2, 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.

### Claim 5 (depends on 2)

The deterioration detecting apparatus according to claim 2, 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.

### Claim 6 (depends on 2)

The deterioration detecting apparatus according to claim 2, 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 does not detect the deterioration in the insulating resistor of the electric power source.

### Claim 7

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; 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 a deterioration in the insulating resistor of the electric power source, and the voltage of the capacitor during discharging.