Arrangement for generating a sawtooth current

Details Arrangement for generating a sawtooth current Arrangement for generating a sawtooth current

1988-11-02

1989-12-26

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

048900435

ABSTRACT:
A line deflection stage includes a line oscillator (LO), a driver (DR) and a line output transistor (TR1) the collector of which is connected through the parallel arrangement of a switching transistor (TR2) and a diode (D3) to a line deflection coil (Ly) and a scan capacitor (C.sub.s). The deflection coil (Ly) and scan capacitor (C.sub.s) are shunted by a diode (D2) while a flyback capacitor (C.sub.f) is connected across the emitter-collector path of transistor (TR1). The line oscillator (LO) output is also applied to an input of a flyback time controller (TC) which produces a pulse output under the control of a control input (C). This pulse output is amplified by a further transistor (TR3) and an associated transformer (T) and applied to the base of transistor (TR2) to cut this transistor off for a controlled part of the flyback period to prevent the flyback capacitor from immediately discharging and hence extend the flyback period.

REFERENCES:
patent: 4400652 (1983-08-01), Sunderland
patent: 4572994 (1986-02-01), Valkestijn et al.
patent: 4590408 (1986-05-01), Mays
patent: 4607195 (1986-08-01), Valkestijn et al.

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