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Title:
ELECTRIC WIRE PROTECTION DEVICE
Document Type and Number:
Japanese Patent JP2015019544
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an electric wire protection device capable of protecting an electric wire without turning off a load even when an overcurrent flows, an electric wire temperature rises, and it is necessary to cut off a current.SOLUTION: A electric wire protection device, which protects an electric wire 16 on the basis of a smoke temperature of the electric wire 16, includes: calculation means 14 for periodically calculating a temperature of the electric wire 16 on the basis of a value of a current flowing to the electric wire 16 detected by a current sensor (9) and a temperature in the vicinity of the electric wire 16 detected by a temperature sensor 7; and a switch 9 that is interposed to the electric wire 16 and turns on/off a current. The calculation means 14 includes: means 14 for, on the basis of the periodically calculated temperature of the electric wire, predicting a time until the electric wire 16 reaches the smoke temperature; means 14 for determining whether the predicted time is shorter than a prescribed time or not; and means 5 for, when a result of the determination is affirmative, PWM-controlling the switch 9 such that the value of the current flowing to the electric wire 16 is reduced to a prescribed curent value.

Inventors:
MEZAKI GENTA
FURUTO TAKESHI
Application Number:
JP2013146764A
Publication Date:
January 29, 2015
Filing Date:
July 12, 2013
Export Citation:
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Assignee:
AUTO NETWORK GIJUTSU KENKYUSHO
SUMITOMO WIRING SYSTEMS
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
H02H7/00; B60R16/02; H02H5/04; H02H6/00
Attorney, Agent or Firm:
Takao Kono