Analysis of single reactor reversible output magnetic amplifier

Abstract

A single reactor in series with a symmetrical non-linear resistance and the load, oxcited by a.c. line voltage, gives bi-directional d.c. output across the load when polarized by a d.c. magnetizing force. Its simplicity, low drift and low quiescent power loss make the circuit interesting. The operating principle of the amplifier is somewhat different from that of the self-satnratiiig type. The main difference is the available flux re-setting time interval which is less than a half-cycle of the supply frequency. The transfer characteristic of such amplifiers depends mainly on the amount of flux re-set during the re-set interval. A new method of measurement of the flux re-setting characteristics of cores has been presented and with the characteristics thus obtained the analysis of the amplifier has been made with a non-idealized B—H loop. The normalized transfer characteristics for various available re-set intervals have been drawn, enabling one to determine the output voltage-input current relations of suc...