Phase controlled transistor power supply regulation

Summary form only given. This paper describes the use of transistors in phase regulated power supplies. This type of power supply, which has been implemented previously with thyratrans, theoretically entails no dissipation in the regulator circuits. The regulator transistors are operated as rectifying switches whose conduction phase with respect to the ac supply voltage can be controlled over a 90° range. With an inductance input filter, current flow occurs in each switch as square waves of a magnitude dependent on the conduction phase of the switches. Voltage regulation is obtained by feedback control of the conduction phase of the transistor switches to maintain a constant output voltage with variation in input voltage and load impedance. Because of the efficient switch properties of transistors, this type of power supply regulation results in extremely low transistor dissipation.