High frequency computer terminal power supply with isolation

Details High frequency computer terminal power supply with isolation High frequency computer terminal power supply with isolation

1981-01-26

1983-08-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Power supply from deflection circuit source

358190, H01J 2970

Patent

active

043981330

ABSTRACT:
A power supply for use in a computer terminal capable of providing a plurality of direct voltage signals to the computer terminal logic system while isolating this logic circuitry from the line voltage is disclosed. A high frequency power supply transformer and associated circuitry provides the various direct voltage signals to the computer terminal logic system and provides isolation between the line input and logic circuitry. Parallel isolation is provided by a horizontal sync coupling circuit which is driven by the logic system and which, in turn, synchronizes the horizontal deflection system. The direct voltage signals provided to the logic supply system are both scan- and pulse-derived from the horizontal sweep signal permitting various computer terminal systems to be operated by display-derived power output signals.

REFERENCES:
patent: 3641267 (1972-02-01), Cavallari
patent: 4245180 (1981-01-01), Rilly et al.
patent: 4301394 (1981-11-01), Dietz
patent: 4321512 (1982-03-01), Alvord et al.

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