Title:
GROUND FAULT DETECTION CIRCUIT AND GROUND FAULT DETECTION DEVICE
Document Type and Number:
Japanese Patent JP2022019097
Kind Code:
A
Abstract:
To notify the ground fault of a positive supply line and the ground fault of a negative supply line distinctively without erroneous operation, even when a plurality of DC voltage devices differing in generated voltage coexist.SOLUTION: Provided is a ground fault detection circuit 110 for individually detecting the ground fault of a positive supply line 231 and the ground fault of a negative supply line 232 connecting a DC voltage device 210 and a load 220. The ground fault detection circuit 110 comprises: a first current mirror circuit 130 whose reference potential is the positive supply line 231; a second current mirror circuit 140 whose reference potential is the negative supply line 232; a reference current line 150 shared by both current mirror circuits; a copy current line 160 shared by both current mirror circuits; a ground part 161 provided to the copy current line 160 between the two current mirror circuits; a reference current circuit for determining a reference current and interposedly connected to the reference current line 150 between the two current mirror circuits; and a ground potential circuit for determining the ground potential of the ground part 161 relative to the negative supply line 232 on the basis of the reference current.SELECTED DRAWING: Figure 1
Inventors:
TANAKA GENKI
Application Number:
JP2020122682A
Publication Date:
January 27, 2022
Filing Date:
July 17, 2020
Export Citation:
Assignee:
MURATA MACHINERY LTD
International Classes:
G01R31/52; G01R31/50; G01R31/56; G01R31/58; H02H3/16
Attorney, Agent or Firm:
Hiroi Arai