OPERATIONAL AMPLIFIER CIRCUIT AND ARC FAULT CIRCUIT INTERRUPTER INCLUDING THE SAME
First Claim
1. An operational amplifier circuit for an arc fault circuit interrupter comprising a current sensor including a secondary and a processor including a number of inputs, said operational amplifier circuit comprising:
- a band pass filter comprising an input structured to be electrically interconnected with the secondary of said current sensor and an output;
a rectifier circuit comprising;
an operational amplifier comprising an input electrically interconnected with the output of said band pass filter and an output,a half-wave rectifier comprising an input electrically interconnected with the output of said operational amplifier, an output, and a forward voltage between the input and the output of said half-wave rectifier, anda voltage compensation circuit cooperating with the input and the output of said operational amplifier to compensate for said forward voltage; and
an envelope detector circuit comprising an input electrically interconnected with the output of said half-wave rectifier and an output structured to be input by one of the number of inputs of said processor.
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Accused Products
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.
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Citations
22 Claims
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1. An operational amplifier circuit for an arc fault circuit interrupter comprising a current sensor including a secondary and a processor including a number of inputs, said operational amplifier circuit comprising:
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a band pass filter comprising an input structured to be electrically interconnected with the secondary of said current sensor and an output; a rectifier circuit comprising; an operational amplifier comprising an input electrically interconnected with the output of said band pass filter and an output, a half-wave rectifier comprising an input electrically interconnected with the output of said operational amplifier, an output, and a forward voltage between the input and the output of said half-wave rectifier, and a voltage compensation circuit cooperating with the input and the output of said operational amplifier to compensate for said forward voltage; and an envelope detector circuit comprising an input electrically interconnected with the output of said half-wave rectifier and an output structured to be input by one of the number of inputs of said processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An arc fault circuit interrupter comprising:
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separable contacts; an operating mechanism structured to open and close said separable contacts; an arc fault detector structured to determine an arc fault trip condition operatively associated with said separable contacts, said arc fault detector comprising; a current sensor structured to sense a current flowing through said separable contacts, said current sensor including a secondary, a processor including a number of inputs and an output, a band pass filter comprising an input electrically interconnected with the secondary of said current sensor and an output, a rectifier circuit comprising; an operational amplifier comprising an input electrically interconnected with the output of said band pass filter and an output, a half-wave rectifier comprising an input electrically interconnected with the output of said operational amplifier, an output, and a forward voltage between the input and the output of said half-wave rectifier, and a voltage compensation circuit cooperating with the input and the output of said operational amplifier to compensate for said forward voltage, and an envelope detector circuit comprising an input electrically interconnected with the output of said half-wave rectifier and an output electrically interconnected to one of the number of inputs of said processor; and a trip mechanism cooperating with the output of said processor and said operating mechanism to trip open said separable contacts responsive to said determined arc fault trip condition. - View Dependent Claims (18, 19, 20, 21)
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22. An operational amplifier circuit for an arc fault circuit interrupter comprising a current sensor including a secondary and an envelope detector circuit comprising an input, said operational amplifier circuit comprising:
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a band pass filter comprising an input structured to be electrically interconnected with the secondary of said current sensor and an output; and a rectifier circuit comprising; an operational amplifier comprising an input electrically interconnected with the output of said band pass filter and an output, a half-wave rectifier comprising an input electrically interconnected with the output of said operational amplifier, an output, and a forward voltage between the input and the output of said half-wave rectifier, the output of said half-wave rectifier being structured to be electrically interconnected with the input of said envelope detector circuit, and a voltage compensation circuit cooperating with the input and the output of said operational amplifier to compensate for said forward voltage.
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Specification