Television receiver power supply regulation responding to beam c

Details Television receiver power supply regulation responding to beam c Television receiver power supply regulation responding to beam c

1983-03-30

1985-06-25

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

315411, H04N 318

Patent

active

045257396

ABSTRACT:
The raster scanned by a television receiver deflection circuit is subject to an increase in size resulting from a decrease in high voltage level caused by increasing electron beam current. The receiver comprises a switched mode power supply producing a voltage supply that is used to power the deflection circuit and generate the high voltage. The voltage supply level incorporates an ac ripple component caused by loading on the supply due to increasing beam current. A peak detector senses the peak level of the voltage supply and applies it to a regulator control circuit which maintains the peak level of the supply voltage constant. Increasing beam current loads the supply, decreasing the average dc voltage level applied to the deflection circuit, thereby decreasing the electron beam scan to compensate for a reduction in high voltage level.

REFERENCES:
patent: 4104567 (1978-08-01), Peer et al.
patent: 4118739 (1978-10-01), Umehara
patent: 4298829 (1981-11-01), Luz
patent: 4302803 (1981-11-01), Shelly
U.S. patent application Ser. No. 445,776, Filed Nov. 30, 1982, J. E. Hicks, "Shutdown Circuit for a Switching Regulator in a Remote Controlled Television Receiver", Assigned to RCA.

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