New types of power supplies for ultrasonic processing equipment

A power supply with a thyristor-type high-frequency inverter was developed for high-power ultrasonic magnetostrictive processing equipment. It meets the basic five requirements of smooth current and voltage buildup, sufficiently long recovery time, absence of parasitic high-frequency switching cycles, symmetric load current, and wide load regulation within a given frequency range. It consists of two three phase banks of charging thyristors with series inductances, two three phase banks of discharging thyristors with series inductances, one bank of three commutating capacitors, and output transformer, and a pair of voltage limiting diodes. The performance of this inverter is evaluated for equivalent circuit diagrams for each characteristic period of the operating cycle of charging thyristors and discharging thyristors.