H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/102
H04N 3/233 (2006.01) H04N 5/63 (2006.01)
Patent
CA 1326538
ABSTRACT A deflection switch of a horizontal deflection circuit is coupled to a retrace resonant circuit that includes a horizontal deflection winding and a first retrace capacitance. A flyback transformer primary winding is coupled to a junction terminal of the deflection switch and the retrace resonant circuit. An East-West modulation current is generated by a bidirectional second switch having a conduction time that is phase modulated during horizontal retrace at a vertical rate in a parabolic manner. The second switch is coupled in series with the deflection switch during the entire trace interval. To prevent an over-current condition when the current in the second switch exceeds a predetrermined first level, the second switch is turned off and interrupts the flow of current through the deflection switch. Additionally, a diode is coupled between an intermediate terminal of the transformer primary winding and a junction terminal of the deflection and the second switches for preventing an overvoltage condition from developing across the second switch.
592536
Craig Wilson And Company
Rca Licensing Corporation
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