Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1976-07-02
1978-01-17
Farley, Richard A.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315403, 315408, 315410, H01J 2970
Patent
active
040694437
ABSTRACT:
A vertical-sweep generator for a deflection yoke of a cathode-ray tube in a television receiver comprises a monolithic integrated semiconductor chip including transistors and resistors defining, together with external circuit elements, a free-running multivibrator (O, O.sub.1), an associated synchronizing circuit (O.sub.2), and a ramp-current generator (RC, RC.sub.1) controlled by the multivibrator in order to regulate the yoke current by way of a power amplifier (PA) and a flyback circuit (FG). The multivibrator generates short switching pulses, of a duration equaling about one-fourth of the flyback period, whose disappearance coincides with the start of the ramp current; these switching pulses are triggered by externally applied synchronizing pulses and cause the blocking of a discharge loop for a sweep capacitor in series with the yoke, charged in the second half of the flyback period, whereby the discharge current flowing at the end of a sweep cycle is directed into a storage circuit (C109, C110) during the first half of the next flyback period preparatorily to a recharging of the sweep capacitor. Upon termination of the switching pulse, the blocking of the discharge loop is maintained during the remainder of the flyback period by a clamping circuit (PA.sub.2) responsive to a voltage differential between the storage circuit and the power supply.
REFERENCES:
patent: 3441791 (1969-04-01), Beck
patent: 3727096 (1973-04-01), Wilcox
patent: 3794877 (1974-02-01), Smith et al.
patent: 3979641 (1976-09-01), Arakawa et al.
Farley Richard A.
Ross Karl F.
SGS-ATES Componenti Elettronici S.p.A.
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