H02M 3/33553

Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only {of the forward type with automatic control of the output voltage or current with galvanic isolation between input and output of both the power stage and the feedback loop}