Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-05-18
1988-12-06
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315387, H01J 2956
Patent
active
047898119
ABSTRACT:
A line deflection circuit in a picture display device in which a bidirectional supply switch controlled at the line frequency, as inductance and a bidirectional deflection switch likewise controlled at the line frequency are arranged in series between the terminals of a supply voltage source. A line deflection resonant network is connected to the deflection switch. By means of a forward control of the period of conductance of the supply switch the amplitude of the line deflection current is changed at the field frequency and by means of a feedback control of the said period this amplitude is maintained constant during a time interval which is short with respect to the duration of a field period. The line amplitude is substantially independent of the value of the line frequency and the trace capacitor is switchable as a function of the line frequency.
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Blum Theodore M.
Cain David
Gadson Gregory P.
U.S. Philips Corporation
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