Industry Patents
Patent: 6870324
Method For Color Mixing With Arc Stability and Straightening of HID Lamps Operated at High Frequencies Using Duty Cycle Modulation
(Click image for PDF of full patent)
| Patent Number: |
6870324 |
| Title: |
Method For Color Mixing With Arc Stability and Straightening of HID Lamps Operated at High Frequencies Using Duty Cycle Modulation |
| Abstract: |
A method of color mixing with arc stability and arc straightening of HID
lamps operated at high frequencies which modulates a duty cycle of a half
bridge configured resonant inverter at a frequency which is substantially
one-half the frequency of a second longitudinal acoustic mode of the HID
lamp. The method also sweeps the switching frequency in a high frequency
range of such resonant inverter. The duty cycle modulation effectuates
power modulation to create a fixed frequency power component which is
substantially equal to the frequency of the second longitudinal acoustic
mode. The sweeping switching frequency of the half bridge configured
resonant inverter drives the HID lamp in a manner which effectuates arc
stability and arc straightening.
|
| Country of Issue: |
US |
| First Named Inventor: |
Shen |
| Assignee: |
Philips |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 37/02 |
| US Classification: |
315/223 |
| Issue Date: |
03-22-2005 |
| Filing Date: |
08-15-2001 |
| Application : |
09/930730 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
6870324 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6870324 at Google Patents |
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after the patent has issued - they take a while to get new patents in their systems.
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