Vertical deflection circuit

Details Vertical deflection circuit Vertical deflection circuit

1991-02-19

1992-02-18

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315403, G09G 104, H01J 2970

Patent

active

050897551

ABSTRACT:
A vertical amplifier of a vertical deflection circuit has an output transistor operating as a conductive switch that couples a boosted supply voltage to a vertical deflection winding during vertical retrace. A feedback network that bypasses the deflection winding is coupled between an output terminal and an input terminal of the amplifier to provide a phase lead. A clamping diode is coupled to the feedback network. The clamping diode reduces a magnitude of a feedback signal, during vertical retrace, in a manner to delay an instant in which the output transistor begins operating as an amplifier stage. The lengthening of vertical retrace due to the feedback signal is thereby reduced.

REFERENCES:
patent: 4795949 (1989-01-01), Wilber
patent: 4884012 (1989-11-01), Leonardi
A Data Sheet for Integrated Circuit TDA8178 made by SGB-Thomson Microelectronics, dated Jun. 1989.
A Preliminary Data Sheet for Integrated Circuit (IC) TDA8170, dated Apr. 1986.
Schemiatic diagram, pp. 289-290 of a manual of a CTC 131 television receiver chassis produced by RCA Corporation.

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