Industry Patents
Patent: 5945786
Discharge Lamp Igniter with Reduced Noise Output
(Click image for PDF of full patent)
| Patent Number: |
5945786 |
| Title: |
Discharge Lamp Igniter with Reduced Noise Output |
| Abstract: |
A gas discharge lamp is provided having a ballast control element and
suppressible igniter. The igniter is chosen to superimpose an ignition
pulse onto the initial AC ballast cycle or cycles provided to the lamp.
The secondary coil of the igniter transformer is initially shorted until
sufficient voltage is applied to the igniter. This causes a switch
arranged across the secondary coil to open. A voltage detector coupled to
a primary winding of the igniter transformer senses the amount of voltage
applied from the ballast. Once that amount has been detected, the
secondary winding is no longer shorted and the igniter can initially
ignite the lamp during a peak of the initial cycle or cycles from the
ballast. After the lamp has been initially ionized/discharged, or after a
pre-defined set of discharges, the switch remains closed for the duration
of each and every ballast cycle. Thus, the igniter is suppressed from the
ballast output, and the ballast alone provides lamp discharge.
|
| Country of Issue: |
US |
| First Named Inventor: |
Jurek |
| Assignee: |
High End Systems |
| Continuation or Divisional of: |
|
| International Classification: |
H02H 7/04 |
| US Classification: |
315/276 |
| Issue Date: |
08-31-1999 |
| Filing Date: |
06-02-1997 |
| Application : |
08/867542 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
5945786 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
5945786 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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