Industry Patents
Patent: 7990673
Safety Loop for a Light Fixture
(Click image for PDF of full patent)
| Patent Number: |
7990673 |
| Title: |
Safety Loop for a Light Fixture |
| Abstract: |
A light fixture and a method for control of a light fixture is supervised
by at least one thermoswitch which protects the light source by
disconnecting the power supply to the light source at elevated
temperature. To achieve a safety circuit in a light fixture without
switching the supply circuit to a light source, the at least one
thermoswitch is connected to a low voltage safety loop, which safety loop
is connected to a current source that generates a constant current in the
safety loop. The safety loop is supervised by a current measuring device.
Hereby, it is achieved that the switching, if temperature rises, is
achieved by switching contacts that only carry a very limited current.
This will increase the life time of the thermoswitch and very small
switches can be used.
|
| Country of Issue: |
US |
| First Named Inventor: |
Vinther |
| Assignee: |
Martin Professional |
| Continuation or Divisional of: |
|
| International Classification: |
H02H 5/04 |
| US Classification: |
361/103 |
| Issue Date: |
08-02-2011 |
| Filing Date: |
04-23-2008 |
| Application : |
12/107833 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7990673 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7990673 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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