SINGLE WOUND CURRENT TRANSFORMER IMPEDANCE MEASUREMENT CIRCUIT
First Claim
1. A single wound single current transformer impedance measurement circuit for determining a circuit element parameter, comprising:
- a transconductance amplifier having first and second input terminals and first and second output terminals;
a first detector having first and second input terminals and an output terminal, the first input terminal of the first detector coupled to the first output terminal of the transconductance amplifier and the second input terminal of the first detector coupled for receiving a first electrical signal; and
a second detector having first and second input terminals and an output terminal, the first input terminal of the second detector coupled to the second output terminal of the transconductance amplifier.
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Accused Products
Abstract
A single wound single current transformer impedance measurement circuit for determining a circuit element parameter in a ground fault circuit interrupter circuit. The circuit includes a transconductance amplifier having first and second input terminals and first and second output terminals. In an embodiment, a first detector has input terminal coupled to the first output terminal of the transconductance amplifier and another input terminal coupled for receiving a first electrical signal. A second detector has a terminal coupled to the second output terminal of the transconductance amplifier and an input terminal coupled for receiving the first electrical signal. Alternatively, the second detector has an input terminal coupled to the first output terminal of the transconductance amplifier and another input terminal coupled for receiving the first electrical signal.
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Citations
20 Claims
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1. A single wound single current transformer impedance measurement circuit for determining a circuit element parameter, comprising:
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a transconductance amplifier having first and second input terminals and first and second output terminals; a first detector having first and second input terminals and an output terminal, the first input terminal of the first detector coupled to the first output terminal of the transconductance amplifier and the second input terminal of the first detector coupled for receiving a first electrical signal; and a second detector having first and second input terminals and an output terminal, the first input terminal of the second detector coupled to the second output terminal of the transconductance amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A single wound single current transformer impedance measurement circuit for determining a circuit element parameter, comprising:
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a transconductance amplifier having first and second inputs and first and second outputs, the first output of the transconductance amplifier coupled to a first node; a first switch having a control terminal and first and second conduction terminals, the first conduction terminal of the first switch coupled to the first output of the transconductance amplifier; a second switch having a control terminal and first and second conduction terminals, the first conduction terminal of the second switch coupled to the second output of the transconductance amplifier, the second conduction terminal of the second switch coupled to the second conduction terminal of the first switch; an inverter having an input and an output, the input of the inverter coupled to the control terminal of the second switch and the output of the inverter coupled to the control terminal of the first switch; and a first operational amplifier having first and second inputs and an output, the output of the first operational amplifier coupled to a second node and to the second input of the first operational amplifier. - View Dependent Claims (15, 16, 17, 18)
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19. A single wound single current transformer impedance measurement circuit for determining a circuit element parameter, comprising:
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a transconductance amplifier having first and second input terminals and first and second output terminals; a first detector having first and second input terminals and an output terminal, the first input terminal coupled to the first output terminal of the transconductance amplifier and the second input terminal coupled for receiving a first electrical signal; and a second detector having first and second input terminals and an output terminal, the first input terminal coupled to the first output terminal of the transconductance amplifier. - View Dependent Claims (20)
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Specification