Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1977-11-23
1979-08-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315399, H01J 2970, H01J 2976
Patent
active
041646894
ABSTRACT:
The invention is concerned with a circuit arrangement for driving a saw-tooth current in a coil primarily intended for use as a line output stage for a television receiver. The circuit arrangement comprises a parallel resonant circuit which incorporates a line deflection coil, a diode connected in parallel with the coil to conduct the deflection current during a first portion of each operating cycle, a second diode and a thyristor connected in series with one another in parallel with the coil, the thyristor being fired by pilot pulses to conduct the deflection current in a second portion of each cycle immediately following the first portion, a series resonant circuit including a capacitor connected in parallel with a thyristor for quenching the thyristor at the end of the second portion of each cycle and a third diode connected in series with the capacitor in a circuit branch connected in parallel with the second diode and serving to transfer energy from the series resonant to the parallel resonant circuit. The circuit offers the advantage that it may readily be adapted to permit modulation of the deflection current and to provide auxiliary voltages unaffected by such modulation.
REFERENCES:
patent: 3495126 (1970-02-01), Dietz
Blum Theodore M.
Indesit Industria Elettrodomestici Italiana S.p.A.
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