Browse Prior Art Database

Bridge Circuit

IP.com Disclosure Number: IPCOM000095271D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Anderson, JL: AUTHOR

Abstract

Orthogonal rotation of magnetization in transformer links in the legs of a bridge can control their impedance. Thus, the direction of current across a conductor balanced across the bridge is controlled.

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Bridge Circuit

Orthogonal rotation of magnetization in transformer links in the legs of a bridge can control their impedance. Thus, the direction of current across a conductor balanced across the bridge is controlled.

The bridge circuit includes four conductive legs 1...4, coated on all surfaces with retentive magnetic material and the to be selected conductor 5. Each leg
1...4 includes at least one enlarged area 11...14 with a central aperture, which area is referred to as a chain link. The impedance of each chain link 11...14 varies as a function of the direction of magnetization in the region of its central aperture. Imbalance between impedances of the various legs of the bridge thus controls the division of current across conductor 5. For example, if links 11 and 13 are in a state in which their impedance significantly exceeds that of the other two legs, the direction of current across conductor 5 is that shown by the arrows.

The links are so constructed that the axis of magnetization parallel to a field created by passing current through the associated leg is preferred over the axis of magnetization parallel to a field created by passing current through a control conductor threading the link. Control currents selectively applied to links 11...14 hold their related legs in the nonpreferred axis magnetization condition. During application of the drive field, the region about the links, due to flux rotation toward the preferred axis, acquires an inductance whic...