Current detector and current measuring apparatus including such detector with temperature compensation
First Claim
1. A residual current detection device comprising a plurality of resistive shunts for connection in respective ones of a plurality of lines through which current can flow to and from a load, and detector means sensitive to the voltage developed across each of the shunts to detect any imbalance between the currents flowing through the shunts, the detector means comprising a converter in the form of an integrated circuit mounted on and electrically connected to each of the resistive shunts and temperature compensation means, including a temperature sensor provided on or within a corresponding one of said resistive shunts or in said integrated circuit, for facilitating compensation for fluctuations in shunt resistance with variations in temperature.
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Accused Products
Abstract
A current sensing device and a residual current detection device are described having a temperature compensation capability so that residual current can be directly measured to a high degree of precision in the background of a high load current. The residual current device comprises a plurality of resistive shunts for connection in respective ones of a plurality of lines through which current can flow to and from a load, and a detector means sensitive to the voltage developed across each of the shunts to detect any imbalance between the currents flowing through the shunts.
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Citations
21 Claims
- 1. A residual current detection device comprising a plurality of resistive shunts for connection in respective ones of a plurality of lines through which current can flow to and from a load, and detector means sensitive to the voltage developed across each of the shunts to detect any imbalance between the currents flowing through the shunts, the detector means comprising a converter in the form of an integrated circuit mounted on and electrically connected to each of the resistive shunts and temperature compensation means, including a temperature sensor provided on or within a corresponding one of said resistive shunts or in said integrated circuit, for facilitating compensation for fluctuations in shunt resistance with variations in temperature.
- 11. A current sensor comprising a rigid metallic link member having two end portions of conductive material and an intermediate portion interconnecting the end portions, said intermediate portion being formed of a resistive material, and an integrated circuit analog to digital converter mounted on said intermediate portion, said converter having analog input terminals electrically connected to respective ones of said two end portions and digital output terminals for connection to a processing apparatus, wherein a temperature sensor is provided on or within said intermediate portion or in the integrated circuit analog to digital converter mounted onto said intermediate portion.
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19. A current measurement apparatus comprising:
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at least one current sensor comprising;
a rigid metallic link member having two end portions of conductive material and an intermediate portion interconnecting the end portions, said intermediate portion being formed of a resistive material, and an integrated circuit analog to digital converter mounted on said intermediate portion, said converter having analog input terminals electrically connected to respective ones of said two end portions and digital output terminals, wherein a temperature sensor is provided in the integrated circuit analog to digital converter mounted onto said intermediate portion; and
a processor circuit connected to the digital output terminals of each of said at least one current sensor to receive and process digital signals received from said at least one current sensor, in order to determine whether a current imbalance exists. - View Dependent Claims (20, 21)
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Specification