Vertical deflection circuit
AssigneeRCA Corporation
InventorJohn Charles Peer
Life of this patent
Estimating the term…
Abstract
A push-pull amplifier, which is supplied with a first voltage, provides deflection current to a vertical deflection winding during a trace period of each deflection cycle. The amplifier is switched off by an input waveform to initiate the retrace interval. A voltage developed across the winding to oppose a change in deflection current activates switching means to couple the winding to a second voltage source during retrace. The voltage applied to the winding during retrace is of greater magnitude than the first voltage. The switching means bypasses the winding current away from the main conducting paths of the amplifier during retrace.
Claims9
A deflection circuit comprising:
- a deflection winding;
- a deflection amplifier with an output terminal coupled to said winding for providing current to said winding;
- a first voltage source coupled to said amplifier for providing an operating voltage to said amplifier;
- a source of input signals coupled to an input terminal of said amplifier for defining trace and retrace intervals during each deflection cycle, said signals turning off said amplifier at the end of the trace interval thereby causing a voltage to be developed across said winding opposing a change in current in said winding;
- a second voltage source;
- and
- switching means coupled to said input terminal and said output terminal of said amplifier and said second voltage source and being responsive to the voltages at said input and output terminals for coupling a greater magnitude voltage across said winding during said retrace interval and bypassing current away from said amplifier during said retrace interval.
Dependencies are inferred from the claim text.