Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1992-07-20
1995-05-16
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315389, G09G 104, H01J 2970
Patent
active
054163897
ABSTRACT:
A device for controlling the linearity of a horizontal deflection stage comprising a deflection yoke supplied with a yoke current controlled by a switch and series-connected to a capacitor for varying the yoke voltage according to the phase of the yoke current; the device comprising a circuit for detecting and generating a real signal proportional to the yoke current, a ramp generator for generating an ideal ramp signal having rising portions defining a given S-shaped wave:form, and an error amplifier for receiving the real and ideal ramp signals and generating an error signal for driving a power transistor having its emitter and collector terminals connected parallel to the capacitor for modifying the voltage in the capacitor so that the yoke current assumes the required waveform.
REFERENCES:
patent: 3796911 (1974-03-01), Ensor et al.
patent: 3996611 (1976-12-01), Toone
patent: 4188567 (1980-02-01), Monroe
patent: 4297620 (1981-10-01), Quan
patent: 4302708 (1981-11-01), Spilsbury
patent: 4423358 (1983-12-01), den Hollander
patent: 4868464 (1989-09-01), Watanabe et al.
patent: 5970894 (1976-07-01), Yasuda et al.
Gornati Silvano
Merlo Mauro
Issing Gregory C.
SGS--Thomson Microelectronics S.r.l.
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