Deflection supply voltage feedback control in conjunction with frequency change
US7030575B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2003 |
| Grant date | Apr 18, 2006 |
| Priority date | — |
| Expiry date | Apr 16, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/27
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video display includes a scanner operable at a first frequency and a higher second frequency. A switch mode power supply drives a transformer with three secondaries. First and second rectifiers & filters are associated with the first and second secondaries. A rectifier is coupled to the third secondary and by way of a switch to the first filter. Feedback from the first filter controls the SMPS. In a first operating mode, the scanner is operated at the first frequency, the switch is open, the scanner supply is a first voltage from the first filter, and ancillary equipment is supplied with a third voltage by the second filter. In a second operating mode, the scanner is operated at the second frequency, the switch is closed, the scanner supply is a second voltage, higher than the first, from the first filter, and ancillary equipment is supplied with the same third voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.