PROTECTION DEVICE - FURUKAWA ELECTRIC CO LTD

Title:

PROTECTION DEVICE

Document Type and Number:

Japanese Patent JP2023147410

Kind Code:

A

Abstract:

To suppress cost and to protect a wire from a temperature rise of the wire.SOLUTION: A protection device is a protection circuit which cuts off current flowing from a switch installed between a power supply and a load to the load via the wire, and includes: a current measurement part for measuring current flowing in a shunt resistor connected in series with the wire; and a determination part for turning the switch on or off on the basis of current measured by the current measurement part. The shunt resistor has the same temperature at energization as the wire when temperature characteristics are approximately the same as the wire and an environment temperature is equal to the environment temperature of the wire. The determination part turns off the switch when a current value measured by the current measurement part is equal to or higher than a threshold which is previously determined from an environment temperature upper limit of the wire, a wire limit temperature of the wire and the temperature characteristics of the shunt resistor.SELECTED DRAWING: Figure 1

More Like This:

WO/2015/059735

POWER SUPPLY APPARATUS

Inventors:

YASUI TAKAHIRO
USAMI TAKEHIRO
HIRAYAMA HIROKI

Application Number:

JP2022054886A

Publication Date:

October 13, 2023

Filing Date:

March 30, 2022

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