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Browse Prior Art Database

Current Sensing Device

IP.com Disclosure Number: IPCOM000090002D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Taylor, R: AUTHOR

Abstract

This device senses the current in a wire conductor without physically contacting the conductor. The device consists of two U-shaped ferrite cores which can be clamped around the wire. A small strain gauge is mounted in one of the gaps between the cores.

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Current Sensing Device

This device senses the current in a wire conductor without physically contacting the conductor. The device consists of two U-shaped ferrite cores which can be clamped around the wire. A small strain gauge is mounted in one of the gaps between the cores.

When the wire is carrying current, a magnetic field is produced surrounding the wire and is concentrated in the cores and creates a force. The movement of the gap is limited to the travel of the strain gauge which is practically zero and, therefore, linear force versus current is provided. The change of resistance of the strain gauge is representative of the current value.

The device can be used to measure direct current and alternating currents of low frequency. When measuring direct current, the device is immune to polarity.

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