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Magnetic Amplifier Core With Low Remanence

IP.com Disclosure Number: IPCOM000062769D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Radcliffe, JK: AUTHOR

Abstract

The operation of a saturable reactor, which is configured as a magnetic amplifier, is confined exclusively in the right hand plane of its core's hysteresis loop, i.e., first and fourth quadrants, with or without offset. Control is achieved by closing a control switch (which may be a semiconductor switch such as a transistor or an SCR) to produce a shorted turn on the core at a selected time during the reset period of the magnetic amplifier cycle. This shorted turn traps the flux in the core, thus preventing full reset and confining the operation to the right hand plane. This permits a core material (e.g., a soft ferrite material) to be used which has a relatively low remanence characteristic (i.e., the squareness of its hysteresis loop is poor).

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Magnetic Amplifier Core With Low Remanence

The operation of a saturable reactor, which is configured as a magnetic amplifier, is confined exclusively in the right hand plane of its core's hysteresis loop, i.e., first and fourth quadrants, with or without offset. Control is achieved by closing a control switch (which may be a semiconductor switch such as a transistor or an SCR) to produce a shorted turn on the core at a selected time during the reset period of the magnetic amplifier cycle. This shorted turn traps the flux in the core, thus preventing full reset and confining the operation to the right hand plane. This permits a core material (e.g., a soft ferrite material) to be used which has a relatively low remanence characteristic (i.e., the squareness of its hysteresis loop is poor). As a result, greater design and construction flexibility is achieved along with a concomitant reduction in component and power supply levels for the reactor, i.e., amplifier.

Disclosed anonymously.

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