Method for coloring mixing of hid lamps operated at VHF frequencies using duty cycle modulation
US6498441B1 · kind B1 · utility
5Cited by
4References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 10, 2001 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | Aug 10, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of color mixing a very high frequency operated HID lamp which effectuates power modulation to the HID lamp at a frequency of the second longitudinal acoustic mode by modulating the duty cycle of a half bridge configured resonant inverter. The duty cycle is modulated with a modulation frequency which is substantially one-half the frequency of the second longitudinal acoustic mode of the HID lamp. In operation, exciting the second longitudinal acoustic mode of the HID lamp with the half bridge configured resonant inverter operated with a modulated duty cycle achieves color mixing along a vertical axis of the HID lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.