Industry Patents
Patent: 7358686
Method and Device for Driving a Gas Discharge Lamp
(Click image for PDF of full patent)
| Patent Number: |
7358686 |
| Title: |
Method and Device for Driving a Gas Discharge Lamp |
| Abstract: |
A method for dimming a gas discharge lamp, such as an HID lamp including
an MH lamp, includes operating the lamp at nominal power with commutating
DC current having a current magnitude I.sub.L=.alpha.I.sub.nom, .alpha.
being equal to 1 or less than 1. The current magnitude I.sub.L is
reduced, but the lamp still is operated at commutating DC current, until
.alpha. reaches a predetermined value .beta.. Then, the lamp is operated
at DC current, and the current magnitude is reduced further, thus
achieving a lower dimming level.
|
| Country of Issue: |
US |
| First Named Inventor: |
Deurloo |
| Assignee: |
Philips |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 37/02 |
| US Classification: |
315/291 |
| Issue Date: |
04-15-2008 |
| Filing Date: |
11-14-2002 |
| Application : |
10/496708 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7358686 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7358686 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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