High speed deflection yoke driver circuit

Details High speed deflection yoke driver circuit High speed deflection yoke driver circuit

1978-05-24

1979-12-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

041807650

ABSTRACT:
A driver circuit (68) for a CRT magnetic deflection yoke (80) includes a current switching transistor (88) connected across a deflection voltage source (84) in series with the deflection yoke (80). The transistor switch (88) is periodically switched "on" and "off" to generate the proper current waveform in the deflection yoke. A clamping circuit (74) including several clamping diodes (90, 92) prevents the voltage across the current switching transistor (88) from dropping below a limiting voltage level. The transistor is thus held out of saturation. When the current switch is "on", a differential amplifier (78) controls base drive to the transistor (88) in accordance with the voltage drop across the clamping diodes (90, 92) in order to maintain the current through the clamping diodes (90, 92) at a low, substantially fixed level, independently of variations in deflection yoke current. Speed of operation is thus enhanced by reducing charge storage effects in the clamping diodes (90, 92).

REFERENCES:
patent: 3774068 (1973-11-01), Yasumatsuya
patent: 3786303 (1974-01-01), Hilburn
patent: 3921036 (1975-11-01), Morio et al.

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