Reversing Thyristor Armature Dual Converter with Logic Crossover Control

Several techniques are available for the design of reversible armature power supplies. The approach described in this paper results in a very high performance system and retains the high conversion efficiency of a single converter bridge. A unique firing circuit and regulator design allows the transfer characteristics of the two converter bridges to be coincident. Logic circuitry is used to select the operating bridge dependent on system requirements Performance characteristics are discussed with particular reference to test results obtained from a 100-hp reversing screw-down supply.