Electric lamp and discharge devices: systems – Cathode ray tube circuits – Power supply from deflection circuit source
Patent
1994-03-17
1995-11-14
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Power supply from deflection circuit source
315408, 315387, H01J 2970, G09G 104
Patent
active
054669936
ABSTRACT:
A deflection apparatus for a raster scanned cathode ray tube display, the apparatus comprising: a ramp generator having a flyback circuit including a first inductor connected in series with a first transistor switch, the first transistor switch being responsive to a line drive signal to alternately open and close a current path through the first inductor between a first voltage level and a second voltage level lower than the first voltage level to generate a raster scan current signal in a deflection coil of the display, the amplitude of the raster scan current signal being determined as a function of the first voltage level and the frequency of the line drive switching signal, and a boost circuit connected to the flyback circuit, the boost circuit comprising a second inductor connected in series with a second transistor switch, the second transistor switch being responsive to a pulse signal synchronized to the line drive signal to alternately open and close a current path through the second inductor between the second voltage level and a third voltage level higher than the second voltage level to generate the first voltage level, the first voltage level being determined as a function of the third voltage level and the width of the pulses of the pulse signal; and a regulator connected to the flyback circuit and the boost circuit for varying the width of the pulses of the pulse signal as a function of the amplitude of the line scan signal to maintain a constant raster line width as the frequency of the line drive signal is varied.
REFERENCES:
patent: 4368409 (1983-01-01), Sivanesan et al.
patent: 4954758 (1990-09-01), Rusk
patent: 4956586 (1990-09-01), Gipson et al.
patent: 5276604 (1994-01-01), Messman
patent: 5278764 (1994-01-01), Matsumoto
Dillon Andrew J.
International Business Machines - Corporation
Issing Gregory C.
McKinley Martin J.
Yudell Craig J.
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