Operational amplifier circuit and arc fault circuit...

Details Operational amplifier circuit and arc fault circuit... Operational amplifier circuit and arc fault circuit...

2011-08-23

2011-08-23

Fureman, Jared (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S002000

Reexamination Certificate

active

08004802

ABSTRACT:
An operational amplifier circuit is for an arc fault circuit interrupter including a current sensor having a secondary and an envelope detector circuit having an input. The operational amplifier circuit includes a band pass filter having an input structured to be electrically interconnected with the secondary of the current sensor and an output; and a rectifier circuit. The rectifier circuit includes an operational amplifier having an input electrically interconnected with the output of the band pass filter and an output, a half-wave rectifier having an input electrically interconnected with the output of the operational amplifier, an output, and a forward voltage between the input and the output of the half-wave rectifier, the half-wave rectifier output being structured to be electrically interconnected with the input of the envelope detector circuit, and a voltage compensation circuit cooperating with the input and the output of the operational amplifier to compensate for the forward voltage.

REFERENCES:
patent: 6570392 (2003-05-01), Macbeth et al.
patent: 7830269 (2010-11-01), Cheng et al.
patent: 2008/0204949 (2008-08-01), Zhou et al.
Intersil Corporation, “EL5120, EL5220, EL5420”, 12MHz Rail-to-Rail Input-Output Op Amps, FN7186.4, Feb. 21, 2005, 12 pp.
National Semiconductor Corporation, “LMH6645/46/47 2.7V, 650μA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option”, 2005, 19 pp.

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