Current sensor and current sensor manufacturing method
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Accused Products
Abstract
A low-cost, current sensor suitable for mass production and a manufacturing method thereof are provided. The current sensor is small with high sensitivity and can be packaged in a standard assembly line which is normally used when an integrated circuit is manufactured. Further, it is possible to obtain a sufficient shielding effect against a disturbance flux without degrading the detecting sensitivity of a flux. A first magnetic material 50 is bonded to the lower part of a current conductor 22C. The first magnetic material 50 has the function of converging and amplifying a flux 3 generated by the current to be measured. A second magnetic material 51 is bonded above a magnetic sensor chip 20. The second magnetic material 51 has a shielding function against a disturbance flux entering from the outside.
44 Citations
20 Claims
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1-11. -11. (Canceled).
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12. A current sensor comprising
a housing of molded plastics, a metallic current conductor through which a current to be measured flows, a magnetic field sensor chip containing at least one magnetic field detection element, the magnetic field sensor chip placed on a side of the current conductor, a flux concentrator placed on the magnetic field sensor chip for urging a flux generated by the current flowing through the current conductor to pass through the at least one magnetic field detection element, and input and output terminals an end of each of which is electrically connected to a terminal of the magnetic field sensor chip, wherein a portion of the current conductor carrying the magnetic field sensor chip lies in a first plane and the ends of the input and output terminals electrically connected to the terminals of the magnetic field sensor chip lie in a second plane oriented substantially parallel to the first plane, wherein a distance between the first and second plane substantially disappears or is substantially the same as a thickness of the magnetic field sensor chip.
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17. A method of manufacturing a current sensor, comprising the steps of:
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forming a thin plate-like metal into a leadframe containing a current conductor and input and output terminals, placing a magnetic field sensor chip containing at least one magnetic field detection element on a side of the current conductor, connecting electrical terminals of the magnetic field sensor chip to the input and output terminals, forming a plastic housing by molding the current conductor, the magnetic field sensor chip and the input and output terminals, and separating the current conductor and the input and output terminals from each other. - View Dependent Claims (18, 19, 20)
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Specification