Abstract: A deflection circuit coupled to a deflection winding produces scanning current in the winding. A deflection rate voltage is developed at a first terminal of the deflection circuit. A source of operating voltage supplies energy to the deflection circuit, and a sensing circuit coupled to a source of voltage representative of an energy level in the deflection circuit produces an error signal for a control circuit that provides first and second control signals. A controllable switch coupled to the source of operating voltage and the first terminal provides operating current to the deflection circuit through the controllable switch. A first portion of the deflection rate voltage, under normal conditions, commutates off the controllable switch.

Abstract: A controllable switch is coupled to a source of energy and a first terminal of a deflection circuit. A second switch is coupled in parallel with the first switch. The controllable switch is poled to conduct forward operating current, while the second switch is poled to conduct return current to the source. A control circuit controls the duration of conduction of the controllable switch for providing a controlled amount of energy to the deflection circuit. The deflection rate voltage at the first terminal commutates off the controllable switch; the second switch then conducts the return current.

Abstract: A boosted B+ regulator in a horizontal deflection system adds a voltage derived from the deflection system to the line-rectified direct current voltage supplying the deflection system in such amount as to maintain a substantially constant boosted B+ supply voltage in the presence of variations of line voltage. Variations of the line-rectified voltage are sensed by a reference voltage network and added to a constant ramp voltage, the combination of voltages being applied to control the period of conduction of an active current conducting device which permits energy derived from the deflection system to be added to the line-rectified voltage supply for maintaining a regulated boosted supply voltage for the deflection system.In one embodiment the energy derived from the deflection system is half-wave rectified by the active current conducting device.