Industry Patents
Patent: 8207691
Methods and Apparatus for Operating Groups of High-Power LEDs
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| Patent Number: |
8207691 |
| Title: |
Methods and Apparatus for Operating Groups of High-Power LEDs |
| Abstract: |
The object of the invention is to implement an energy-efficient, compact
and cost-effective solution for driving a number of high-power LED groups
for lighting applications, by using a single switching power supply
together with LEDs connected in series and/or in parallel and pulse
width-controlled switches in parallel across the individually
controllable LED groups. If the switch of an LED group is ON, the LED
group will not light up. If the switch is in the OFF position, the full
current of the power supply will pass through the corresponding LED
group. Another aspect of the invention is the restriction within the
drive protocol, according to which but a single switch is actuated at any
one time within a particular time interval. This aspect guarantees a
minimum time interval between each individual actuation event. Another
aspect is the derating of the power supply in those phases where not a
single LED group is ON. In the event of all the switches being closed
(all LED groups OFF) the power supply can be derated (or turned off). A
further aspect is the use of an elevated current setting of the power
supply with the simultaneous restriction of the ON cycle by means of
pulse width modulation. The power supply is set to the maximum
instantaneous peak current of the LED, while maximum pulse width drive
guarantees a maximum of the average LED current, cycle time being left
over as a result, thus enabling more LEDs to be driven at a given supply
voltage.
|
| Country of Issue: |
US |
| First Named Inventor: |
Slot, Cremer |
| Assignee: |
EldoLAB |
| Continuation or Divisional of: |
|
| International Classification: |
H05B 37/02 |
| US Classification: |
315/360 |
| Issue Date: |
06-26-2012 |
| Filing Date: |
04-07-2006 |
| Application : |
11/910755 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
8207691 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
8207691 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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