Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-04-27
1991-03-12
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315403, H01J 2970, H01J 2972
Patent
active
049995499
ABSTRACT:
A deflection system comprises: a signal generator, an amplifier stage, a negative feedback path and a vertical rate waveform generator. The signal generator is coupled to a source of flyback pulses for developing from energy in the flyback pulses a horizontal rate drive signal having a predetermined and substantially constant DC voltage reference level. The amplifier has a first input coupled for receiving the horizontal rate drive signal and an output coupled to a deflection coil. The amplifier output has a DC voltage reference level corresponding to the DC reference level of the horizonatl rate drive signal. A DC feedback signal on the negative feedback path is related to deflection current. The feedback path is coupled between the coil and a second input of the amplifier. The vertical rate waveform is also coupled to the second input of the amplifier for modulating the horizontal rate drive signal. The output of the amplifier is a pulse width modulated control signal for a switching element, for example a silicon controlled rectifier. In a switched mode vertical deflection system, the horizontal rate drive signal and the vertical rate waveform are ramp signals and the flyback pulses are horizontal flyback pulses. The signal generator is DC coupled between the source of flyback pulses and the amplifier. The signal generator comprises a Zener diode, a capacitor and a resistor connected in parallel.
REFERENCES:
patent: 4048544 (1977-09-01), Haferl
patent: 4081721 (1978-03-01), Haferl
patent: 4234826 (1980-11-01), Dietz
patent: 4544864 (1985-10-01), Haferl
patent: 4795949 (1989-01-01), Wilber
patent: 4916371 (1990-04-01), Coccetti et al.
Blum Theodore M.
Fried Harvey D.
Laks Joseph J.
RCA Licensing Corporation
Tripoli Joseph S.
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