Current sensor and current detection unit using the same
First Claim
1. A current sensor using a magnetic detection device having a magnetic body adapted to allow high frequency currents to directly flow through it and change its magnetic permeability in response to the external magnetic field, said sensor comprising:
- parallel electric wire sections of a pair of electric wires arranged in parallel wit each other and adapted to flow respective electric currents of the same intensity in directions opposite to each other,wherein said magnetic detection device has a magnetic field detecting direction rectangular relative to a prolonged line connecting centers of said parallel electric wire sections and is adapted to detect the difference between the magnetic field formed by the parallel electric wire section located close to the magnetic detection device and the magnetic field formed by the parallel electric wire section located remote from the magnetic detection device and directed oppositely relative to the former magnetic field in order to detect the intensity of the electric currents flowing through said parallel electric wire sections,wherein the parallel electric wire section locate close to said magnetic detection device and the parallel electric wire section located remote from said magnetic detection device are coupled at respective one ends thereof within the sensor.
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Accused Products
Abstract
A current sensor does not have large dimensions but is adapted to highly sensitively detect an electric current and can be manufactured with ease at low cost. The current sensor comprises parallel electric wire sections of a pair of electric wires arranged in parallel with each other and adapted to flow respective electric currents of the same intensity in directions opposite to each other and a magnetic detection device arranged on a prolonged line connecting the center axes of the parallel electric wire sections. The magnetic detection device has a magnetic field detecting direction rectangular relative to said prolonged line and is adapted to detect the difference between the magnetic field formed by the parallel electric wire section located close to the magnetic detection device and the magnetic field formed by the parallel electric wire section located remote from the magnetic detection device and directed oppositely relative to the former magnetic field in order to detect the intensity of the electric currents flowing through said parallel electric wire sections.
14 Citations
13 Claims
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1. A current sensor using a magnetic detection device having a magnetic body adapted to allow high frequency currents to directly flow through it and change its magnetic permeability in response to the external magnetic field, said sensor comprising:
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parallel electric wire sections of a pair of electric wires arranged in parallel wit each other and adapted to flow respective electric currents of the same intensity in directions opposite to each other, wherein said magnetic detection device has a magnetic field detecting direction rectangular relative to a prolonged line connecting centers of said parallel electric wire sections and is adapted to detect the difference between the magnetic field formed by the parallel electric wire section located close to the magnetic detection device and the magnetic field formed by the parallel electric wire section located remote from the magnetic detection device and directed oppositely relative to the former magnetic field in order to detect the intensity of the electric currents flowing through said parallel electric wire sections, wherein the parallel electric wire section locate close to said magnetic detection device and the parallel electric wire section located remote from said magnetic detection device are coupled at respective one ends thereof within the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 13)
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7. A current detection unit comprising:
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a current sensor including; parallel electric wire sections of a pair of electric wires arranged in parallel with each other and adapted to flow respective electric currants of the same intensity in directions opposite to each other; and a magnetic detection device having a magnetic body adapted to allow high frequency currents to directly flow through it and change its magnetic permeability in response to the external magnetic field, said magnetic detection device having a magnetic field detecting direction rectangular relative to a prolonged line connecting centers of said parallel electric wire sections and being adapted to detect the difference between the magnetic field formed by the parallel electric wire section located close to the magnetic detection device and the magnetic field formed by the parallel electric wire section located remote from the magnetic detection device and directed oppositely relative to the former magnetic field in order to detect the intensity of the electric currents flowing through said parallel electric wire sections; a circuit substrate carrying said magnetic detection device and said parallel electric wire sections thereon, said circuit substrate being provided at a part thereof with a through hole or notch, free ends of said parallel electric wire sections being exposed to the outside through said through hole or notch; and a detection circuit arranged on said circuit substrate to detect the output of the current detection unit by way of said magnetic detection device, wherein the parallel electric wire section locate close to said magnetic detection device and the parallel electric wire section located remote from said magnetic detection device are coupled at respective one ends thereof within the sensor. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification