Short circuit detection device and short circuit detection method

Patent metadata

Field	Value
Publication number	US-12487293-B2
Application number	US-202218568074-A
Country	US
Kind code	B2
Filing date	Jun 14, 2022
Priority date	Jun 14, 2021
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

A short circuit detection device for detecting a short circuit occurring in a detection target measures an electrostatic capacitance value of the detection target and determines, on the basis of the measured electrostatic capacitance value, a current value of a current to be supplied to the detection target. Furthermore, the short circuit detection device supplies the current having the determined current value to the detection target and detects a short circuit in the detection target while the current is being supplied to the detection target.

First claim

The invention claimed is:

1 . A short circuit detection device for detecting a short circuit occurring in a detection target, the short circuit detection device comprising:
a capacitance measurement circuit configured to measure an electrostatic capacitance value of the detection target; a current determinator configured to determine a current value of a current to be supplied to the detection target, on the basis of the electrostatic capacitance value measured by the capacitance measurement circuit; a current supply circuit configured to supply the current having the current value determined by the current determinator to the detection target; and a detection circuit configured to detect a short circuit in the detection target while the current is being supplied to the detection target by the current supply circuit.

2 . The short circuit detection device according to claim 1 , comprising:
a memory configured to store in advance a detection time for detecting a short circuit in the detection target by the detection circuit, wherein the current determinator determines the current value of the current to be supplied to the detection target, on the basis of the detection time stored in the memory and the electrostatic capacitance value measured by the capacitance measurement circuit.

3 . The short circuit detection device according to claim 1 , comprising:
a memory configured to store a set current value set in advance, wherein the current determinator determines the current value of the current to be supplied to the detection target, on the basis of the set current value stored in the memory and the electrostatic capacitance value measured by the capacitance measurement circuit, and when the set current value is equal to or less than the determined current value, detects a short circuit in the detection target while a current having the set current value is being supplied to the detection target.

4 . The short circuit detection device according to claim 1 , wherein
the current determinator increases the current value of the current supplied to the detection target as the electrostatic capacitance value increases, and decreases the current value of the current supplied to the detection target as the electrostatic capacitance value decreases.

5 . The short circuit detection device according to claim 1 , wherein
the current determinator controls the current supply circuit such that a value obtained by dividing the electrostatic capacitance value by the current value of the current supplied to the detection target is constant.

6 . The short circuit detection device according to claim 1 , comprising:
a memory configured to store in advance an upper limit current value indicating an upper limit of the current to be supplied to the detection target, wherein the current determinator determines the current value of the current to be supplied to the detection target, on the basis of the upper limit current value stored in the memory and the electrostatic capacitance value measured by the capacitance measurement circuit, and when the determined current value exceeds the upper limit current value, detects a short circuit in the detection target while a current having the upper limit current value is being supplied to the detection target.

7 . A short circuit detection method of detecting a short circuit occurring in a detection target, the short circuit detection method comprising:
measuring, by a capacitance measurement circuit, an electrostatic capacitance value of the detection target; determining, by a current determinator, a current value of a current to be supplied to the detection target, on the basis of the electrostatic capacitance value measured by the capacitance measurement circuit; supplying, by a current supply circuit, the current having the current value determined by the current determinator to the detection target; and detecting, by a detection circuit, a short circuit in the detection target while the current is being supplied to the detection target by the current supply circuit.

Assignees

• Hioki Electric Works

Inventors

• Nishimura Kota
• Iijima Junji

Classifications

• G01R19/16571

  comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current (G01R19/16514, G01R19/16519, G01R19/16528, G01R19/16533, G01R19/1659 take precedence; measuring currents by using elements sensitive to the magnetic field generated G01R15/14; measuring earth resistance G01R27/18; testing for leakage or short circuits in electrical apparatus G01R31/52) · CPC title

• G01R15/165

  measuring electrostatic potential, e.g. with electrostatic voltmeters or electrometers, when the design of the sensor is essential (electrometers with passively moving electrodes G01R5/28; measuring electrostatic fields G01R29/12; measuring charge G01R29/24; measuring in circuits with high internal resistance G01R19/0023) · CPC title

• G01R31/3865

  related to manufacture, e.g. testing after manufacture · CPC title

• G01R31/389

  Measuring internal impedance, internal conductance or related variables · CPC title

• G01R31/50

  Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections (testing of sparking plugs H01T13/58) · CPC title