A power control system having a range power control and a power distribution control circuit cascaded with the range power control The power distribution control circuit distributes power from the range power control to a plurality of loads equal to a predetermined value The range power control comprises a full wave bridge rectifier having a pair of fixed diodes and pair of silicon controlled rectifiers The bridge circuit provides phase controlled full wave rectified power output The power distribution control includes an independent section and a dependent section, each section having a load Changes in power output of the independent section load in turn varies the power output of the dependent section load resulting in a constant power distribution between the loads A delay network is used to couple the independent section to the dependent section

Power control system

For controlling the current in an inductive load, the gate current used to fire thyristors in a rectifier is controlled to reach zero at exactly the same time, within a given half-wave, as the current in the inductive load which receives the voltage from the rectifier, keeping gate voltage on as long as thyristor current is on. A discontinuous thyristor converter current signal is detected and used to generate an enable signal in conjunction with a thyristor gate voltage. The enable signal, in synchronism with a power supply line voltage, provides a pair of channeling signals which then, depending upon whether the field current is positive or negative, activate the gate voltages of the thyristors such that the gate voltages end exactly at that time, within a given half-wave, where the generator field current becomes discontinuous.

Shaw William

Papers

Current and voltage regulating circuit