Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1981-02-02
1982-02-16
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315399, H01J 2970, H01J 2976
Patent
active
043161278
ABSTRACT:
Improvements to combined power supply and horizontal deflection devices in a television receiver.
According to the invention, the line transformer includes a winding W.sub.1 for maintaining an oscillation circuit including the deflector Ly of the cathode-ray tube and a winding W.sub.2 which may be connected to a power supply source E through a controlled switch I.sub.2 ; the winding W.sub.1 is not effectively put into service for the sweep until a switch I.sub.3 or I'.sub.3 using a diode D'.sub.3 with a relatively long recovery time and operating in phase opposition with respect to I.sub.2 is closed, so that the temporary short-circuit of winding W.sub.1 during a sweep trace is not felt by the power supply source E.
The invention mainly permits powering all the circuits of a television set from a single transformer, the line transformer.
REFERENCES:
Peruth and Schrenk, Pumpschaltungein Fortschrittliches Transistorkonzept fur Fernsehempfanger, Siemens Bauteile Report, vol. 12, 1979, No. 3.
Dietz and McNulty, Comparison of Transistor and SCR Deflection Circuits for Color Television, IEEE Transactions on Consumer Electronics, vol. CE-22, No. 4, Nov. 1976.
Blum Theodore M.
Videocolor (S.A.)
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