Simplified vertical deflection circuit

Details Simplified vertical deflection circuit Simplified vertical deflection circuit

1979-11-19

1981-07-07

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315403, 315389, H01J 2954

Patent

active

042777291

ABSTRACT:
A simplified bootstrap deflection circuit includes a sawtooth capacitor with one end grounded. First and second serially connected resistors provide charging current to form a ramp voltage across the capacitor. The noninverting input of an amplifier is coupled to receive the ramp. The amplifier output is coupled to a deflection winding and current sensing resistor. A feedback path couples the current sensing resistor to the inverting input terminal. A resistor is coupled to the inverting input terminal and to a reference potential. A bootstrap capacitor couples sawtooth feedback voltage at the inverting input terminal to the junction of the first and second capacitors for producing a constant voltage across the second resistor for linearizing the ramp. The feedback path includes a series variable resistor which acts as a centering control.

REFERENCES:
patent: 3646393 (1972-02-01), Tarr
patent: 3890542 (1975-06-01), Zimmermann
patent: 3988638 (1976-10-01), Nillesen
patent: 4188567 (1980-02-01), Monroe

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