Dynamic focus circuit

Details Dynamic focus circuit Dynamic focus circuit

H - Electricity

04

N

350/99

H04N 5/14 (2006.01) H04N 3/26 (2006.01)

Patent

CA 1233562

ABSTRACT A dynamic focus circuit for a television display picture tube provides a focus voltage having scan rate modulation. The parabolically shaped voltage which is produced across the S-shaping capacitor in a deflection system is coupled by a transformer having a primary winding coupled between the junction of the S-shaping capacitor and the deflection winding and a power supply point having substantially the same average DC potential. Therefore, substantially no DC current flows through the transformer primary winding, which permits a relatively small transformer to be used without saturation of the magnetic core and without the need for a coupling capacitor for DC isolation.

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