Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1979-11-30
1980-12-16
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315400, 315411, H01J 2970
Patent
active
042400120
ABSTRACT:
A trace switch including a horizontal output transistor is coupled across the series arrangement of a horizontal deflection winding and trace capacitor. The trace capacitor is charged from a source of unregulated DC input voltage through the primary winding of a flyback transformer. The emitter of the horizontal output transistor is coupled to ground through a first winding of a second transformer. A second capacitor is coupled between ground and the series arrangement of the deflection winding and trace capacitor. The average trace voltage across the trace capacitor is constrained to assume the difference in voltage between the unregulated input voltage and the voltage developed across the second capacitor. The charge/discharge cycle of the second capacitor is controlled by the current flowing in the second transformer. When the horizontal output transistor becomes cut off at the beginning of retrace, current ceases to flow in the first winding of the second transformer and begins to flow in a second winding of the transformer through a diode, returning current to the unregulated voltage source. At a controlled subsequent instant, a controllable switch such as an SCR is turned on and directs current in the second winding away from the source. The average voltage across the second capacitor and thus the average trace voltage may be regulated by varying the turn-on instant of the controllable switch.
REFERENCES:
patent: 3881135 (1975-04-01), Dietz
patent: 3970780 (1976-07-01), Minoura
patent: 4146823 (1979-03-01), Dietz
patent: 4156834 (1979-05-01), Farina
Hubler Malcolm F.
Laks Joseph J.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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