Coreless current sensor
AssigneeKinectrics Inc.
InventorEric George de Buda
Life of this patent
Estimating the term…
Abstract
A time varying current sensor is constructed using surface coils uniformly spaced around a central cavity adapted to receive the conductor through which the current to be measured flows. Accurate and uniform coil geometry is achieved using printed circuit board technology, thereby eliminating the high cost of precision toroidal coil winding. An optional hinge in the housing can allow the sensor to be easily installed on existing conductors without the need to disconnect and reconnect.
Claims24
A current sensor for measuring a time varying current flowing through a conductor, comprising:
- a plurality of discrete planar insulating substrates substantially equidistant from a central cavity for receiving the conductor, said planar substrates being spaced apart from each other and aligned with angularly spaced planes that are oriented in substantially axial and radial directions relative to the axis of said cavity, and with at least one surface coil having at least one complete turn defined on a single surface of each said substrate, said coils being electrically interconnected such that output voltages of said coils are combined and applied to output terminals of said sensor, wherein at least a plurality of the coils on separate substrates are interconnected with each other with twisted pair wire.
A current sensor for measuring a time varying current flowing through a conductor, comprising:
- a plurality of planar insulating substrate elements substantially equidistant from a central cavity for receiving the conductor, said substrate elements being spaced apart from each other and aligned with angularly spaced planes that are oriented in substantially axial and radial directions relative to the axis of said cavity, and with at least one surface coil having at least one complete turn defined on a single surface of each said substrate element, said coils being electrically interconnected such that output voltages of said coils are combined and applied to output terminals of said sensor, wherein at least a plurality of the substrate elements are integral with each other, being sections of a flexible substrate strip.
Dependencies are inferred from the claim text.