Arrangement for varying the excitation of a deflection circuit i

Details Arrangement for varying the excitation of a deflection circuit i Arrangement for varying the excitation of a deflection circuit i

1975-12-17

1977-06-07

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315399, H01J 2970, H01J 2976

Patent

active

040285880

ABSTRACT:
An arrangement for varying the triggering phase of a thyristor or other controllable switch employed to vary the excitation of a sweep deflection circuit during changes in the circuit load is described. The output of a winding of the deflection transformer is converted to a constant-amplitude sawtooth voltage which has a DC component proportional to the amplitude of the then-occurring forward sweep portion of the sweep voltage. A zener diode or other comparison element coupled to the output of a variable voltage divider whose input is fed by the resulting sawtooth voltage generates a trigger pulse for the controllable switch at the instant, during each cycle of the sweep waveform, that the constant-amplitude sawtooth voltage exceeds a predetermined value.

REFERENCES:
patent: 3609219 (1971-09-01), Diehl
patent: 3789260 (1974-01-01), Ahrens

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