Insulating state detection unit having failure detector

Patent metadata

Field	Value
Publication number	US-9018959-B2
Application number	US-201213445133-A
Country	US
Kind code	B2
Filing date	Apr 12, 2012
Priority date	Apr 14, 2011
Publication date	Apr 28, 2015
Grant date	Apr 28, 2015

Abstract

An insulating state detection unit is configured to perform failure detection for switches, which connect a flying capacitor to a sample hold circuit for acquiring a charge voltage and a ground potential, by using a failure determination threshold value according to a variable value. That is to say, the insulating state detection unit is configured to decide the failure determination threshold value by taking, as a reference, a charge voltage of a capacitor of the sample hold circuit charged with electric charge amount corresponding to a charge voltage of the flying capacitor when the flying capacitor is charged with electric charge amount corresponding to an output voltage of a DC power supply.

First claim

What is claimed is:

1. An insulating state detection unit comprising:
a flying capacitor arranged to be chargeable with an electric charge amount corresponding to an output voltage of a DC power supply insulated from a ground potential;
a voltmeter for measuring a charge voltage of the flying capacitor;
a first switch disposed between a first end of the flying capacitor and the voltmeter for connecting or disconnecting the first end of the flying capacitor to or from the voltm…

Assignees

• Kawamura Yoshihiro
• Yazaki Corp

Inventors

• Kawamura Yoshihiro

Classifications

• G01R31/025 Primary

  Physics · mapped topic

• G01R31/52 Primary

  Physics · mapped topic