Full-wave bridge magnetic amplifiers with inductive loads

THERE are numerous articles treating magnetic amplifiers with inductive loads.1¿3 In the majority of these papers the inductive loads are considered without so-called free-wheeling or discharge paths. When single-ended d-c output circuits are considered in the literature, the conditions are first derived for which the circuit will be unstable with no discharge paths;1,3 then discharge paths are added to make the system stable. In the references cited, the discharge rectifiers are considered to have zero forward resistance, thereby achieving complete decoupling of the inductive load from the controlling reactors during the reset period.