Electric current sensing device of the magnetic field compensation type
First Claim
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1. An electric current sensing device for measuring an electric current flowing in a primary conductor and/or for producing an image thereof, comprising:
- magnetic circuit means capable of being magnetically coupled with said primary conductor, said magnetic circuit means comprising at least one air gap and at least one measuring coil magnetically coupled with said magnetic circuit means, said measuring coil comprising first and second ends, said first and second ends comprising first and second nodes;
magnetic field detector means disposed in said air gap;
electric current control means including a current source and a current control circuit,said current control circuit having first and second current supply terminals,said current control circuit further having a control input and a measuring current supply output, said control input being connected to said magnetic field detector means and said measuring current supply output being connected to said first node of said measuring coil; and
electric current output means, comprising at least one of measuring means and display means, connected to said second node of said measuring coil;
a printed circuit board;
said electric current control circuit comprising a printed circuit formed on said printed circuit board;
said measuring coil, said magnetic field detector means, said current output means, and said current source being connected to said printed circuit;
said printed circuit having first conductive portions directly connected to said first node, and second conductive portions directly connected to said control input;
said first and second portions being arranged at a substantial distance from each other;
said printed circuit board having an aperture for receiving said primary conductor, said aperture being surrounded on at least one face of said printed circuit board, along the major part of the perimeter of said aperture, by conductive portions at a constant potential.
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Abstract
An electric current sensing device for measuring a primary current of relatively high intensity. The device includes a magnetic circuit that is coupled with a primary conductor and with a measuring coil that is connected to a current source through an associated control circuit. The magnetic circuit includes an air gap which accommodates a magnetic field detector that is electrically connected to an input of the control circuit for controlling a magnetic field compensating current that is supplied to the measuring coil. The device also includes a printed circuit that is arranged to both minimize electromagnetic interference between the measuring current circuit and the control circuit input, and improves heat dissipation of the printed circuit, thus optimizing the size ratio of the maximum primary current to the bulk of the device and improving performance of the same.
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Citations
2 Claims
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1. An electric current sensing device for measuring an electric current flowing in a primary conductor and/or for producing an image thereof, comprising:
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magnetic circuit means capable of being magnetically coupled with said primary conductor, said magnetic circuit means comprising at least one air gap and at least one measuring coil magnetically coupled with said magnetic circuit means, said measuring coil comprising first and second ends, said first and second ends comprising first and second nodes; magnetic field detector means disposed in said air gap; electric current control means including a current source and a current control circuit, said current control circuit having first and second current supply terminals, said current control circuit further having a control input and a measuring current supply output, said control input being connected to said magnetic field detector means and said measuring current supply output being connected to said first node of said measuring coil; and electric current output means, comprising at least one of measuring means and display means, connected to said second node of said measuring coil; a printed circuit board; said electric current control circuit comprising a printed circuit formed on said printed circuit board; said measuring coil, said magnetic field detector means, said current output means, and said current source being connected to said printed circuit; said printed circuit having first conductive portions directly connected to said first node, and second conductive portions directly connected to said control input; said first and second portions being arranged at a substantial distance from each other; said printed circuit board having an aperture for receiving said primary conductor, said aperture being surrounded on at least one face of said printed circuit board, along the major part of the perimeter of said aperture, by conductive portions at a constant potential. - View Dependent Claims (2)
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Specification
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Current AssigneeLiaisons Electroniques-Mecaniques LEM SA (Werner O. Weber)
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Original AssigneeLiaisons Electroniques-Mecaniques LEM SA (Werner O. Weber)
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InventorsChuat, Rene, Cattaneo, Pierre
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Primary Examiner(s)Eisenzopf, Reinhard J.
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Assistant Examiner(s)Nguyen, Vinh P.
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Application NumberUS07/373,667Time in Patent Office369 DaysField of Search324/117 R, 324/117 H, 324/251, 324/252, 324/127, 338/32 H, 307/309, 307/494, 307/495, 307/270, 307/296, 307/297, 336/200, 336/205US Class Current324/117.00RCPC Class CodesG01R 15/207 Constructional details inde...
