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    • 5. 发明专利
    • Protection apparatus of the load circuit
    • JP5271619B2
    • 2013-08-21
    • JP2008170710
    • 2008-06-30
    • 矢崎総業株式会社
    • 吉秀 中村
    • H02H3/08B60R16/02G01R19/165G01R31/02H02H6/00
    • PROBLEM TO BE SOLVED: To provide a protective device for a load circuit, which detects the temperature rise of an electric wire and reliably interrupts the load circuit when a chattering short-circuit or a rare short-circuit occurs. SOLUTION: When a current flowing through the electric wire 7 is normal, the rising temperature of the electric wire is calculated by using an algorithm of (A-1) if the saturation temperature of the electric wire 7 by a detecting current is higher than the estimated temperature of the electric wire 7. The falling temperature of the electric wire is calculated by using the algorithm of (B-1) when the saturation temperature of the electric wire 7 by the detecting current is lower than the estimated temperature of the electric wire 7. When the current flowing through the electric wire 7 is an overcurrent, the rising temperature of the electric wire is calculated by using the algorithm of (A-2) if the saturation temperature of the electric wire 7 by the detecting current is higher than the estimated temperature of the electric wire 7. The falling temperature of the electric wire is calculated by using the algorithm of (B-2) if the saturation temperature of the electric wire 7 by the detecting current is lower than the estimated temperature of the electric wire 7. When the temperature of the electric wire reaches a threshold temperature, the load circuit is interrupted. COPYRIGHT: (C)2010,JPO&INPIT