Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2011-04-26
2011-04-26
Fureman, Jared J (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
Reexamination Certificate
active
07933103
ABSTRACT:
Disclosed is an overcurrent detection device for detecting an overcurrent in a load circuit which is arranged to control the driving and the stopping of a load1by a semiconductor switch (FET1) provided between a battery VB and the load1. An added voltage (V1−V3) is generated which is obtained by adding a voltage (V1−V2) generated across the both ends of the semiconductor switch (FET1) to a voltage (V3−V2) which is generated at the time of current change due to the inductance Lp of a copper foil wiring pattern3for coupling the semiconductor switch (FET1) and the load1. A comparator CMP1for comparing the added voltage with an overcurrent determination voltage (V1−V4) set in advance is provided. When the comparator CMP1detects that the added voltage exceeds the overcurrent determination voltage, it is determined that an overcurrent is generated.
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Japanese Patent Office Action dated Dec. 18, 2009 issued in application No. 2005-274369.
Bauer Scott
Fureman Jared J
Sughrue & Mion, PLLC
Yazaki -Corporation
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