PROTECTIVE DEVICE FOR LOAD CIRCUIT

申请公布号：JP2010011695(A)

申请号：JP20080170710

申请日期：2008.06.30

申请公布日期：2010.01.14

申请人：

YAZAKI CORP

发明人：NAKAMURA YOSHIHIDE

分类号：H02H3/08;B60R16/02;G01R19/165;G01R31/02;H02H6/00

主分类号：H02H3/08

摘要：<P>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. <P>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. <P>COPYRIGHT: (C)2010,JPO&INPIT

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