Ground fault detector

Patent metadata

Field	Value
Publication number	US-9103892-B2
Application number	US-201213612951-A
Country	US
Kind code	B2
Filing date	Sep 13, 2012
Priority date	Oct 26, 2011
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

A ground fault detector which does not need complicated circuitry and can detect a ground fault with high accuracy in conformity to a capacitance of a common mode capacitor is presented. Upon judging the ground fault on the basis of a threshold for a high-tension power supply system which is electrically isolated and mounted in a vehicle, a controller in a ground fault detector alters the threshold in conformity to a capacitance of a common mode capacitor of which value is different between a first state that a system main relay is ON and a second state that the system main relay is OFF, thereby judges the ground fault on the basis of the altered threshold. Thus the ground fault detector can adequately detect the ground fault in conformity to the capacitance of the common mode capacitor. Thus the detector can detect the ground fault with accuracy without complicated circuitry.

First claim

The invention claimed is:

1. A ground fault detection system for judging a ground fault, on the basis of a threshold for judging a ground fault, for a high-tension power supply system which is mounted in a vehicle in an electrically insulated state, the ground fault detection system including:
a judging means to alter the threshold on the basis of a state of the vehicle and judge the ground fault on the basis of the altered threshold; and
a plurality of vehicle equipment which a…

Assignees

• Shimizu Takumi
• Denso Corp

Inventors

• Shimizu Takumi

Classifications

• G01R31/006

  Physics · mapped topic

• G01R31/385 Primary

  Physics · mapped topic

• G01R31/025

  Physics · mapped topic

• G01R31/3627 Primary

  Physics · mapped topic

• G01R31/52

  Physics · mapped topic