Antiparallel-Connected Thyristor Scheme Suitable for Feeding Highly Inductive Reversing Load

A novel antiparallel-connected thyristor scheme for feeding highly inductive loads, such as the field of dc machines, alternators, is described. A simplified analysis of the power scheme is described and the choice of the circuit element values based on this analysis is also detailed. Transient analysis of the power circuit is carried out using a general-purpose power electronic converter simulation program, named ATOSEC I, and is compared with experimental waveforms. The suitability of the proposed scheme is demonstrated in the case of a reversible dc drive based on the familiar Ward-Leonard scheme. The performance specifications of an experimental reversible drive scheme are given.