Method and apparatus for using lighting to perform facility-wide power factor correction dimming and remote functions and to communicate with a building control system over a power line communications method(s) which can be programmed after manufacture
US7531922B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2006 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | May 23, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/185
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electronic lighting ballast in a facility intentionally presents a non-unity power factor load to an inductive or capacitive power supply, such a capability being used to correct the power factor for a larger facility employing different types of loads. Electronic lighting ballast is also used to intentionally generate specified harmonics of a certain phase and amplitude to a power source, and further, the method, apparatus and system uses such a capability to cancel undesirable harmonics generated by other equipment in a larger facility. A method of employing a communications protocol between an electronic ballast and a facility control or monitoring system, such that the system can communicate with many adjustable ballast's in a facility, and direct the ballast's, collectively or individually, to change their power factor or light output status or harmonic characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.