Magnetic Amplifier Core With Low Remanence
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
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).