Static amplidyne: A new high-capacity push ¿ Pull power amplifier I ¿ Resistive-inductive loads

A high-capacity static power amplifier with reversible d-c output is described. The circuit consists of six silicon-controlled rectifiers fed from a 3-phase 4-wire a-c supply. The gates are driven by differentially controlled half-wave magnetic amplifiers energized from the line to neutral voltages. The steady-state and the transient operations with resistive and inductive loads are described and static transfer characteristics are calculated for typical loads. A mechanism for the commutation of high inductive loads during output reversal transients is described. This mechanism eliminates altogether line-to-line short circuits and results in extremely fast speed of response.