Electric lamp and discharge devices: systems – Cathode ray tube circuits
Patent
1980-01-21
1981-07-28
Dixon, Harold A.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
315375, 358 72, 358 73, H01J 2334, H04N 927
Patent
active
042812720
ABSTRACT:
An efficient switching power supply provides power for penetration phosphor cathode ray tube color displays employing rapidly selectable high voltages for anode or acceleration electrodes. The apparatus employs a serially connected command decoder, a voltage regulator, a power oscillator, and a voltage multiplier along with an output voltage divider for supplying a fed back voltage to the regulator for comparison purposes. Positive transitions of the high voltage output are directly accomplished in the power oscillator-voltage multiplier serving as a unidirectional voltage to unidirectional voltage converter. The apparatus is further supplied with a signal lever detector responsive to the voltage regulator and employing a switching oscillator to control the conductivity state of a pull down switch coupled in shunt with respect to the anode voltage line. Negative transitions of the high voltage output are controlled by turning off the power oscillator and by pulling the output voltage down by making the pull down switch conductive.
REFERENCES:
patent: 3939377 (1976-02-01), Ignasiak
patent: 3946267 (1976-03-01), Lustig et al.
patent: 4071640 (1978-01-01), Ignasiak
patent: 4104564 (1978-08-01), Cohen et al.
patent: 4203055 (1980-05-01), Chambers et al.
Dixon Harold A.
Sperry Corporation
Terry Howard P.
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