Error signal cancellation for top/bottom pincushion correction c

Details Error signal cancellation for top/bottom pincushion correction c Error signal cancellation for top/bottom pincushion correction c

1987-01-06

1988-05-31

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315389, 315403, H01J 2956, H01J 2970, H01J 2972

Patent

active

047483849

ABSTRACT:
A top/bottom pincushion correction transformer injects a horizontal rate correction signal in series with a vertical yoke that is driven from a vertical amplifier that has a non-inverting and an inverting terminal. A feedback arrangement includes a voltage sensing resistor for supplying a voltage indicative of the current flow in the yoke to the non-inverting terminal of the amplifier. The primary winding of a pincushion transformer is connected in series with a current limiting resistor and their junction is connected by a bridging resistor to the voltage sensing resistor. The voltage developed across the voltage developing resistor is of opposite polarity to the voltage developed across the current limiting resistor for offsetting the same.

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