Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1983-12-27
1986-08-19
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315408, 315411, H01J 2974
Patent
active
046071954
ABSTRACT:
A power supply and scanning line deflection circuit for a picture display device. The power supply circuit comprises an inductance and a switch which switches at line frequency, the inductance forming part of a resonant network during the cut-off period of the switch. The line deflection circuit comprises another switch which also switches at line frequency and a line deflection coil which during the cut-off period of the switch, which substantially coincides with the retrace period, forms part of a resonant network which also comprises an inductance. A transformer winding is coupled to one of the inductances. During the cut-off period of the switch pulses are developed across this transformer winding which are rectified for generating a supply voltage for a variable load. To reduce the internal impedance of the voltage source thus formed, which may serve, for example as the high voltage supply, means are provided for connecting, at least during a portion of the scanning line retrace period, the transformer winding to the other inductance, such connection conducting substantially no current during the scanning line trace period.
REFERENCES:
patent: 3912972 (1975-12-01), Otten et al.
patent: 3950674 (1976-04-01), Joosten et al.
patent: 3999102 (1976-12-01), Gent et al.
patent: 4099101 (1978-07-01), Teuling
patent: 4182978 (1980-01-01), Boekhorst
Bergmans Christianus H. J.
Nooijen Fransiscus M. J.
Valkestijn Leonardus A. A.
Blum Theodore M.
Briody Thomas A.
Cain David
Eason Leroy
Streeter William J.
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