Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2007-10-02
2007-10-02
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
Reexamination Certificate
active
11083699
ABSTRACT:
A semiconductor IC has a current detection resistor and a comparison circuit for comparing the voltage drop across the current detection resistor with a threshold voltage to detect a possibly large magnitude of current passing through the current detection resistor. The semiconductor IC has a current terminal for externally inputting current to the current detection resistor, a highly resistive current-limiting resistor connected between the current detection resistor and one input end of the comparison circuit, and a measurement terminal connected to the node of the input terminal of the comparison circuit and the current limiting resistor. Thus, the magnitude of the current flowing through the measurement resistor is correctly measured without being influenced by the parasitic resistances of the terminals or of the test probe used. The threshold level of detection current is regulated based on the measured level the detection current without flowing therethrough a large amount of current nor implementing any additional device.
REFERENCES:
patent: 6150714 (2000-11-01), Andreycak et al.
patent: 6326771 (2001-12-01), Popescu-Stanesti
patent: 6492845 (2002-12-01), Ge et al.
patent: 6946862 (2005-09-01), Kosuga
patent: 2001-053120 (2001-02-01), None
Bauer Scott
Hogan & Hartson LLP
Jackson Stephen W.
Rohm & Co., Ltd.
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