Self-Shielded Di/Dt Transformer for a Meter
First Claim
1. A sensor for use in metering, comprising:
- a) a core around which are wound first and second windings;
b) an integrating amplifier circuit having a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding, the integrating amplifier circuit configured to generate a phase shift from an input current received at the first input and the current provided to the second winding; and
c) a DC stabilization circuit including a first resistive path coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit, and a second resistive path coupled between the first winding and the first input of the integrating amplifier circuit.
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Accused Products
Abstract
A sensor includes a core, first and second windings, an integrating amplifier circuit and a DC stabilization circuit. The first and second windings are wrapped around the core. The integrating amplifier circuit has a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding. The integrating amplifier circuit is configured to generate a phase shift from an input current received at the first input and the current provided to the second winding. The DC stabilization circuit includes a first resistive path coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit, and a second resistive path coupled between the first winding and the first input of the integrating amplifier circuit.
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Citations
20 Claims
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1. A sensor for use in metering, comprising:
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a) a core around which are wound first and second windings; b) an integrating amplifier circuit having a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding, the integrating amplifier circuit configured to generate a phase shift from an input current received at the first input and the current provided to the second winding; and c) a DC stabilization circuit including a first resistive path coupled between the output of the integrating amplifier circuit and the first input of the integrating amplifier circuit, and a second resistive path coupled between the first winding and the first input of the integrating amplifier circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A sensor, comprising:
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a) a non-magnetic core around which are wound first and second windings, the second winding operably coupled to influence the first winding; b) an integrating amplifier circuit having a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding, the integrating amplifier circuit configured to generate a phase shift from an input current received at the first input and the current provided to the second winding; and c) a sense resistor operably coupled to receive a measurement output current from the second winding and to convert the measurement output current to a measurement voltage. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An arrangement for use in an electricity meter, comprising:
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a) a current coil configured to provide current from a utility power line to a load; b) a core around which are wound first and second windings, the second winding operably coupled to influence the first winding, wherein the current coil, the core and at least one of the first and second windings form a transformer; c) an integrating amplifier circuit having a first input coupled to receive a sensed current from the first winding, and an output operably coupled to provide a current the second winding, the integrating amplifier circuit including an integrating feedback path coupled to receive the current and generate a feedback signal therefrom, the integrating feedback path configured to provide the feedback signal to the first input; and c) a sense resistor operably coupled to receive a measurement output current from the second winding and to convert the measurement output current to a measurement voltage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification