Lamp control circuit
US4101808A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1975 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Sep 30, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/902
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to a lamp control circuit for maintaining the light output intensity of an incandescent lamp or banks of lamps constant. The lamp control circuit comprises a pair of input terminals adapted for connection to an illumination power source having one of the input terminals coupled to one side of the incandescent lamp to be controlled, and switching means coupled to the other side of the controlled lamp and to the other input terminal so that when the switching means is closed the illuminating power from the power source is applied to the controlled lamp and when the switch is open the illuminating power to the controlled lamp is terminated. The lamp control circuit additionally includes an illumination power sampling means which includes a second incandescent lamp which is coupled between the one input terminal and the switching means for sampling the illumination power and converting the sampled illumination power to light energy having an intensity related to the amount of the illuminating power received by the controlled lamp. A light sensitive detector is associated with the second incandescent lamp and is coupled to the switching means for controlling the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.