Arrangement for digital brightness control of lamps
US4396871A · kind A · utility
Inventor
Key dates
| Filing date | Feb 19, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Feb 19, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/155
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an arrangement for digital brightness control of lamps or groups of lamps in control channels particularly for use in planetarium illumination comprising in each control channel a programmable counter, a bistable flip-flop, and a power control stage. Each control channel is connected to a mains synchronizing stage and to a pulse generator. The control channel produces a mains synchronous pulse sequence frequency the pulse width repitition ratio of which depends on the selected division ratio of the programmable counter. The inventional solution offers a simple digital and controllable circuit arrangement for control of thyristors or triacs or transistors which, in turn, control the brightness of lamps or lamp groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.