Circuit arrangement for protecting a CRT and associated circuitry from damage due to arcing
US4706154A · kind A · utility
0Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1985 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Nov 15, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A silicon controlled rectifier (SCR) is connected between a selected electrode of a CRT and a reference potential level that is negative relative to the selected CRT electrode. The SCR remains non-conductive so long as the voltage between the selected electrode and the reference potential level remains below the breakdown voltage of the SCR and the SCR's dv/dt rating is not exceeded. If the voltage between the electrode and the reference potential level increases at a rate that exceeds the threshold rate for the SCR, the SCR turns on and shorts the selected electrode to the reference potential level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.