Fly-back transformer

Details Fly-back transformer Fly-back transformer

1994-07-25

1995-11-14

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

3153821, H01J 2970

Patent

active

054669944

ABSTRACT:
A fly-back transformer for generating a focus voltage to be applied to a cathode-ray tube, includes an iron core, a primary coil, a D.C. voltage generating circuit, and a superimposing circuit. The primary coil is wound on the iron core for receiving a pulse voltage generated during a fly-back period of a horizontal sweep signal for the cathode-ray tube. The D.C. voltage generating circuit includes at least one secondary coil wound on the iron core, for generating, in response to the pulse voltage, a D.C. voltage. The superimposing circuit generates a parabolic-wave voltage from a voltage taken out from one of the at least one secondary coil, and superimposes the parabolic-wave voltage on the D.C. voltage to generate the focus voltage. Alternatively, the superimposing circuit generates a parabolic-wave voltage from a voltage taken out by a third coil wound on the iron core, which has one end connected to an end of the at least one secondary coil.

REFERENCES:
patent: 4316128 (1982-02-01), Shiratsuchi
patent: 4886999 (1989-12-01), Yamane et al.

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