Single controllable switch, push-pull inverter for a television receiver

Abstract

A scan synchronized push-pull power supply for a television receiver has a source of direct voltage coupled to the primary winding of a power transformer. A first controllable switch of the power supply includes a main current path and a control terminal for controlling conduction in the main path. A second switch of the power supply includes a main current path with first and second terminals thereof. The main paths of the two switches are coupled to the primary winding in a push-pull arrangement. A deflection rate signal that is synchronized with scanning current generation is applied to the control terminal of the first switch to alternately switch conduction of its main current path between conductive and nonconductive states during each deflection cycle in synchronism with the scanning current generation. The switching of the main current path of the first switch to either the conductive or nonconductive state produces a change of voltage between two main path terminals of the second switch so as to switch the conduction state of the second switch to the one that is opposite that of the first switch. The switching action of the two switches results in the development of alternating polarity voltages across the primary and secondary windings of the power transformer.