Electronic ballast with adaptive lamp preheat and ignition
US7239094B2 · kind B2 · utility
13Cited by
20References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Dec 3, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast includes a microcontroller with software to provide an adaptive lamp preheat and ignition operation. The microcontroller commands a test frequency from the inverter and detects the frequency response of the resonant output circuit by measuring the voltage across the resonant capacitor. The measured voltages are compared to one or more reference voltages as the frequency is varied to select the optimal inverter frequency. An algorithm or look-up table is used to set the inverter frequencies for the lamp preheat and ignition phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.