Power supply protection circuit

Details Power supply protection circuit Power supply protection circuit

1988-11-21

1990-04-10

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

315371, 358190, H01J 2970, H01J 2956, H04N 563

Patent

active

049163663

ABSTRACT:
A horizontal deflection circuit includes a flyback transformer. A secondary winding of the flyback transformer is coupled in series with a diode switch to produce a trace rectified supply voltage that energizes a vertical deflection amplifier. The diode switch also provides switching operation in an East-West diode modulator. During, for example, service mode operation, when the vertical raster is collapsed, the trace current in the secondary winding is substantially reduced. The reduced trace current is sensed for producing a control signal that causes the peak current supplied by the diode switch to the diode modulator to be smaller than the trace current in the secondary winding. This ensures that the diode switch remains conductive throughout horizontal trace, thereby, preventing an undesirable increase in the supply voltage from occuring.

REFERENCES:
patent: 4084115 (1978-04-01), Peer
patent: 4544864 (1985-10-01), Haferl
patent: 4672642 (1987-06-01), Willis et al.
A Publication entitled RCA Engineer published Jun. 25, 1980, pp. 40 and 41.
Television Service Data for RCA Television Chasis CTC 101 published 1979, the cover page and schematic pp. 42-43.

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