Deflection coil driver apparatus

Details Deflection coil driver apparatus Deflection coil driver apparatus

1980-03-04

1982-02-02

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315397, 315403, H01J 2970

Patent

active

043141846

ABSTRACT:
A deflection coil driver includes a current driver stage comprising three power transistors, a first power transistor being caused to turn on via a class B transistor stage when an input signal of a first polarity is input to the class B stage, second and third power transistors being caused to turn on via said class B stage when the input signal has an opposite polarity. When turned on, the first power transistor couples current from a positive voltage source to the deflection coil, the second power transistor couples current from a negative voltage source to said coil, and the third power transistor couples said coil to ground. A transistor switch determines whether the second or the third power transistor is on, as a function of the voltage across the deflection coil. The current through the coil is also sensed and provides negative feedback to an input amplifier to ensure that the shape of such current matches the shape of the input signal.

REFERENCES:
patent: 3983452 (1976-09-01), Bazin
patent: 4218638 (1980-08-01), Breithaupt

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