Automatic energy control lighting system with automatically variable dc source
US4009387A · kind A · utility
47Cited by
5References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1976 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Jul 19, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/3922
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automatically variable d.c. voltage source supplies a control signal to a dimmer circuit that controls the brightness of a high intensity gas discharge lamp in response to a varying d.c. voltage. The automatically variable d.c. voltage source produces a varying d.c. voltage at its output which is functionally related to the difference between a voltage from a stable reference voltage source and a voltage produced by a photocell circuit which is responsive to the light level of an area illuminated by the lamp controlled by the dimmer circuit. The variable d.c. source includes circuitry for indicating relamping conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.