Current detector utilizing hall effect
First Claim
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1. An apparatus for detecting an electric current, comprising:
- (a) a metal-made baseplate having a known magnetic permeability and a known electrical conductivity;
(b) a magnetic layer formed on the baseplate, the magnetic layer being higher in magnetic permeability than the baseplate;
(c) semiconductor means mounted to the baseplate, the semiconductor means including a Hall-effect device for generating a voltage proportional to the strength of an applied magnetic field;
(d) an encapsulation of electrically insulating material enveloping the baseplate and the magnetic layer and the semiconductor means; and
(e) a conductor for carrying current to be detected, the conductor being disposed contiguous the Hall-effect device in order to cause the Hall-effect device to generate the Hall voltage in response to a magnetic field due to the current flowing through the conductor, and the conductor being disposed opposite the magnetic layer via the Hall-effect device.
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Abstract
A Hall-effect semiconductor device is formed on a metal-made baseplate, as of nickel-plated copper, via a magnetic layer of Permalloy or the like. Higher in magnetic permeability than the baseplate, the magnetic layer is designed to reduce the magnetic resistance of the flux path. A plastic encapsulation thoroughly encloses the semiconductor device, magnetic layer, and baseplate.
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Citations
6 Claims
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1. An apparatus for detecting an electric current, comprising:
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(a) a metal-made baseplate having a known magnetic permeability and a known electrical conductivity;
(b) a magnetic layer formed on the baseplate, the magnetic layer being higher in magnetic permeability than the baseplate;
(c) semiconductor means mounted to the baseplate, the semiconductor means including a Hall-effect device for generating a voltage proportional to the strength of an applied magnetic field;
(d) an encapsulation of electrically insulating material enveloping the baseplate and the magnetic layer and the semiconductor means; and
(e) a conductor for carrying current to be detected, the conductor being disposed contiguous the Hall-effect device in order to cause the Hall-effect device to generate the Hall voltage in response to a magnetic field due to the current flowing through the conductor, and the conductor being disposed opposite the magnetic layer via the Hall-effect device. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification