Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1980-07-07
1981-12-08
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
043050239
ABSTRACT:
An inverter applies a square-wave exciting voltage of horizontal deflection frequency to the primary winding of a ferroresonant power transformer. A square-wave alternating polarity output voltage developed across a secondary winding of the ferroresonant transformer is half-wave rectified and applied to an input choke of a horizontal deflection circuit. The input choke is coupled to the series arrangement of a horizontal deflection winding and a trace capacitor. A pincushion correction circuit switching transistor applies a DC voltage to the input choke at a controlled instant within the nonconduction interval of the half-wave rectified output voltage. The peak-to-peak horizontal scanning current is a function of the average voltage developed across the trace capacitor. This average voltage equals the average value of the voltage applied to the input choke. By varying at a vertical rate in a parabolic manner the controlled instant at which the switching transistor applies the DC voltage to the input choke, the peak-to-peak horizontal scanning current is modulated at a vertical rate in a parabolic manner to provide side pincushion correction.
REFERENCES:
patent: 4088931 (1978-05-01), Haferl
patent: 4118655 (1978-10-01), Wolber
patent: 4140949 (1979-02-01), Terry
patent: 4169989 (1979-10-01), Zappala
patent: 4182978 (1980-01-01), Boekhorst
Blum Theodore M.
Laks Joseph
Meagher William H.
Rasmussen Paul J.
RCA Corporation
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