Electric-wire protection device

Patent metadata

Field	Value
Publication number	US-10707675-B2
Application number	US-201815911445-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 13, 2017
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

An electric-wire protection device includes a voltage adjustment unit that adjusts the voltage to a load, and a controller that includes a temperature calculation unit that calculates temperature information on an electric wire from a value of current, and makes the voltage adjustment unit into a shut-off state based on the temperature information. The temperature information is calculated from an amount of temperature changes based on the current value and a predetermined initial value. The controller shifts into a sleep state when a sleep condition is satisfied that includes a condition that the temperature information is lower than the initial value. The initial value when the controller returns from the sleep state is based on a convergence value of temperature in conducting energization on the electric wire at a maximum value of steady-state current.

First claim

What is claimed is:

1. An electric-wire protection device comprising:
a voltage adjustment unit configured to adjust voltage from a power source side and supply the resulting voltage to a load; and
a controller that includes a temperature calculation unit configured to calculate temperature information on an electric wire that couples the power source and the load from a value of current flowing through the voltage adjustment unit, and makes the voltage adjustment unit into a shut-off state in which the power source and the load are shut off based on the temperature information, wherein
the temperature information is calculated from an amount of temperature changes based on the value of current and a predetermined initial value of the temperature information,
the controller is configured to shift into a sleep state when a sleep condition is satisfied, the sleep condition including a condition that the temperature information is a value on a lower temperature side than the initial value, and
the initial value when the controller returns from the sleep state is a value based on a convergence value of temperature of the electric wire in conducting energization on the electric wire at a maximum value of steady-state current.

2. The electric-wire protection device according to claim 1 , wherein
the controller makes the voltage adjustment unit into the shut-off state when the temperature information becomes a value on a higher temperature side than a predetermined threshold, and
the initial value when the controller returns from the sleep state is a value on a lower temperature side than the threshold.

Assignees

• Yazaki Corp
• Honda Motor Co Ltd

Inventors

• Kikuchi Takashi
• Ueta Keisuke
• Nagakura Syunsuke
• Miyakawa Takahiro
• Nishino Tomoya
• Ujigawa Noboru
• Kawamata Seiju
• Tsukioka Masataka
• Ezoe Rikuya

Classifications

• H02H7/226 Primary

  for wires or cables, e.g. heating wires · CPC title

• H02H6/00

  Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images · CPC title

• G01R19/0092

  Measuring current only · CPC title

• H02H3/08

  responsive to excess current (responsive to abnormal temperature caused by excess current H02H5/04) · CPC title

• H02H5/04 Primary

  responsive to abnormal temperature {(specially adapted for electric machines H02H7/0852)} · CPC title