Reversible-polarity D-C power amplifier using magnetic-amplifier-controlled switched transistors

This paper describes, analyzes, and presents performance data on a reversible-polarity d-c power amplifier suitable for reversing drive of d-c motors in sizes up to 1 horsepower (limited only by presently available components) as well as for a wide range of additional applications including servomechanisms. Full-load and light-load efficiencies, output impedance, power gain, and other characteristics compare favorably with those of the rotating-amplifier-type motor-generator sets. The system under discussion, being completely static, can be expected to show significant advantages in reliability and ability to withstand a wide range of adverse environments. Limitations on size are practical rather than theoretical and may be expected to become less stringent as transistor technology improves and as further developments occur in areas such as switched silicon diodes.