Resonant flyback boost circuit

Details Resonant flyback boost circuit Resonant flyback boost circuit

1983-07-07

1984-06-26

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315395, H01J 2970, H01J 2976

Patent

active

044568568

ABSTRACT:
A resonant flyback boost circuit (21) is used to enchance flyback performance by decreasing the time required for completing flyback on systems using a cathode ray tube and a magnetic deflection coil (11). The boost circuit (21) is parallelly connected across the yoke (11) in order to sense a voltage peak which occurs at the initiation of flyback. The voltage peak is used to initiate a control signal for allowing current to pass from a high voltage source (23) to a supplemental boost capacitor (33). When the potential across the supplemental boost capacitor (33) exceeds the potential across the yoke (11), current flows from the supplemental boost capacitor (33), to an isolating diode (40) to the yoke (11), thereby increasing the current flow through the yoke (11) during the allocated flyback period.
The boost circuit (21) reduces flyback time while maintaining a high input impendance when boost is not being applied. The circuit (21) can be connected to as few as three points, does not require a separate sync pulse and has minimal degrading effect on forward scanning and stroke writing modes of operation.

REFERENCES:
patent: 4164689 (1979-08-01), Zappala
patent: 4400652 (1983-08-01), Sunderland

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