Overcurrent detecting device

Details Overcurrent detecting device Overcurrent detecting device

2007-04-10

2007-04-10

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C361S018000, C361S098000, C324S354000, C324S522000

Reexamination Certificate

active

11318928

ABSTRACT:
An overcurrent detecting device for detecting an overcurrent in a load circuit, includes a DC power supply, a load, a semiconductor switch that controls ON/OFF of the load, a driver circuit that outputs a driving signal to the semiconductor switch, a reference voltage generating circuit that generates a reference voltage from the DC power supply, a voltage drop generating circuit that includes a resistor for generating a voltage drop and generates a voltage drop in the resistor for generating a voltage drop, a decision voltage generating circuit that generates, as a decision voltage, a voltage corresponding to a voltage obtained by adding a voltage drop generated when the semiconductor switch is turned ON and a voltage drop generated in the resistor for generating a voltage drop, and a comparing circuit that compares the decision voltage with the reference voltage and outputs a disconnecting command signal of the semiconductor switch to the driver circuit when the decision voltage is greater than the reference voltage.

REFERENCES:
patent: 4937697 (1990-06-01), Edwards et al.
patent: 6867576 (2005-03-01), Dubhashi
patent: 9-218701 (1997-08-01), None
patent: 2000-312142 (2000-11-01), None
patent: 2001-298849 (2001-10-01), None

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