Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1979-07-25
1981-07-07
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970, H01J 2976
Patent
active
042777305
ABSTRACT:
A flyback generator for a television receiver, in a sweep system driving the vertical-deflection yoke of a cathode-ray tube, comprises a storage capacitor with a low-voltage side grounded through a charging transistor and a high-voltage side connected through an isolating diode to the live terminal of a d-c supply. The charging transistor conducts during scanning but is cut off during flyback by the operation of a first switching transistor while a second switching transistor connects the low-voltage side of the charged storage capacitor to the live supply terminal whereby its high-voltage side is carried to a voltage V.sub.f equaling twice the supply voltage V.sub.s, less any voltage drop across the charging transistor. This high-voltage side is connected to the yoke through an output stage of a power amplifier saturated during flyback. The coupling between the first switching transistor and the charging transistor comprises a voltage-regulating network including a Zener diode connected across the supply; when the supply voltage V.sub.s rises above a threshold V.sub.t established by the Zener diode, a branch current mirroring the Zener current reduces the conductivity of the charging transistor to generate during scanning a voltage V.sub.s =2(V.sub.s -V.sub.t) thereacross which results in a partial discharge of the storage capacitor; thus, the maximum V.sub.F of the flyback voltage V.sub.f, occurring upon switchover, is twice the threshold voltage V.sub.t.
REFERENCES:
A. Romano, A Monolithic Integrated Circuit for Vertical Deflection in Television Receivers, Presented 1973, Published 1975 by Transactions CE.
Blum Theodore M.
Ross Karl F.
SGS-ATES Componenti Elettronici S.p.A
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