Static control for a mechanically regulated D-C supply

CONVENTIONAL automatic voltage control for a regulating transformer is not designed to detect and correct for fluctuations directly in a d-c line, yet close control of the voltage across the 40-kv rectifier output was required recently for a radar pulsing station. The problem was solved with the design of a new d-c sensing control using two high-gain transistor-magnetic bistable amplifiers and a varistor detector. The low-voltage tap on a bleeder-resistance bank across the 40-kv line is the link that made possible this method of voltage sensing.