High voltage shutdown circuit with brightness tracking

Details High voltage shutdown circuit with brightness tracking High voltage shutdown circuit with brightness tracking

1988-07-22

1989-08-08

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

358243, 361 38, H04N 548

Patent

active

048558648

ABSTRACT:
A high voltage shutdown circuit that tracks with brightness changes in the CRT. An ABL (automatic brightness level) signal is applied to adjust the conduction point of a latch transistor that is connected in a trigger arrangement with a zener diode and driven by a sensing winding on a high voltage transformer. The ABL voltage is applied to an inverting transistor and an opposite polarity potential is developed across a capacitor connected in series with the latch transistor. Because of the loading on the high voltage generating means, the voltage across the sensing winding does not accurately reflect the actual high voltage at the CRT and the circuit prevents premature high voltage shutdown under high beam current conditions.

REFERENCES:
patent: 3804981 (1974-04-01), Avins
patent: 3873767 (1975-03-01), Okada et al.
patent: 3980822 (1976-09-01), Suzuki et al.

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