Apparatus and method for supplying power to gas discharge lamp systems
US4087722A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1976 |
| Grant date | May 2, 1978 |
| Priority date | — |
| Expiry date | Jul 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosed invention includes apparatus and method for full wave rectification of commerical alternating current of conventional or standard low frequency (e.g., 50-60 hz.) and for generating substantially square wave pulses of high frequency for transformation to voltage suitable for illumination of gas discharge lamps. The apparatus includes electronic means for rectification and silicone control rectifiers and stearing diodes, plus RC devices, for setting up a primary wave or pulse oscillation to produce a desired form of wave pulses at a suitable high frequency. Apparatus also includes variable potentiometer means for varying the lighting intensity by changing width or duty cycle of power pulses as applied to the primary of the light-operating transformer without substantially changing their frequency. Means which can be on or off also are included to periodically turn off the transformer power for "flashing" or periodic lighting and extinguishing of the lamps when such operation is needed. A unijunction and transistor combination can be switched on to periodically inhibit flow of power to the transformer and thereby produce the flashing action.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.