A high-gain push-pull magnetic amplifier with limited circulating currents

This paper describes a high-gain phase-sensitive magnetic amplifier,1,2 which simultaneously possesses the high-gain property of the self-saturating (100% positive feedback) amplifiers and the limited circulating current property of the low-gain zero feedback amplifiers. These features are obtained by using feedback windings to obtain the self-saturating large-gain property. However, these windings are arranged so that the feedback is positive only when load currents flow, and is zero when circulating currents flow. The circuit is analyzed and its various modes of operation are described. The theory is verified with numerous experimental results.