High frequency computer terminal power supply with isolation
US4398133A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 1981 |
| Grant date | Aug 9, 1983 |
| Priority date | — |
| Expiry date | Jan 26, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/1853
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.