Victor Company of Japan, Limited

Shunji Onodera

Hideo Hishiki

Shinichi Ito

A flyback power supply for use with a cathode-ray tube includes a flyback transformer which comprises a core having two spaced core legs, and two core units supported respectively on the core legs. Each of the coil units includes a low-voltage coil bobbin fitted over one of the core legs, a low-voltage coil wound around the low voltage coil bobbin, a high-voltage coil bobbin disposed around the low-voltage coil bobbin, and a high-voltage coil which comprises a plurality of coil layers wound successively around the high-voltage coil bobbin with insulating layers interposed between the coil layers, the low-voltage coils of the coil units being connected parallel to each other. Diodes are connected in series with the coil layers, respectively of the high-voltage coil of each of the coil units such that voltages produced across the coil layers will be in phase with each other. The high-voltage coils of the coil units are connected in series with each other, whereby voltages produced across the high-voltage coils are added and rectified.

Flyback power supply

In a high voltage DC generator, the primary winding of a flyback transformer is responsive to an input pulse for inducing a high-voltage potential in the secondary winding. A first pair of first and second diodes are connected in series from one of the secondary windings to a first output terminal. A second pair of first and second diodes are connected in series from the other terminal of the secondary winding to a second output terminal. Two capacitors are cross-coupled between the terminals of the secondary winding and the junctions of the diodes of each pair. The first diodes of each pair are turned on in response to the input pulse and the second diodes of each pair are turned on in response to the cessation of the pulse. A ringing reduction circuit comprises a resistive element, a capacitive element and a diode element, the diode and capacitive elements being arranged such that when the first or second diodes of both pairs are conductive the diode element turns on the charge the capacitive element, the resistive element being in circuit with the capacitive element to pass a current in response to the cessation of the pulse to dissipate ringing energy during the trace period.

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Iwai, Japan

Shunji Onodera