High voltage shutdown circuit responsive to excessive beam curre

Details High voltage shutdown circuit responsive to excessive beam curre High voltage shutdown circuit responsive to excessive beam curre

1976-04-12

1977-08-30

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315 85, 315128, 315308, 325362, 328 8, 361 91, H02H 720

Patent

active

040457427

ABSTRACT:
A television receiver includes a conventional tri-color cathode ray tube display system having horizontal and vertical scansion systems. Conventional signal receiving and processing circuitry recovers picture, sound and scansion synchronizing information. A high voltage shutdown circuit is responsive to excesses of either high voltage or CRT beam current. The former being detected by a resistance divider coupled between high voltage and ground while the latter is sensed by a resistor placed in series with the secondary winding of the horizontal deflection transformer. A PNP, NPN transistor pair configured to form a switch analogous to a silicon controlled rectifier responds to detected excesses of beam current or high voltage and loads down the operating supply to the horizontal scansion oscillator to terminate high voltage generation. The transistor pair accommodates a degenerating network to reject false triggering.

REFERENCES:
patent: 3546536 (1970-12-01), Umin
patent: 3813580 (1974-05-01), Norman
Martin, CRT Screen Protection System, IBM Technical Disclosure Bulletin, vol. 12, No. 11, Apr. 1970, pp. 1738-1740.

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