Lighting & Illumination
May 2012
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Figure 1: Lighting controls for next generation lighting.
A significant percentage of a building's energy consumption is due to its lighting.
Historically, lighting was a coarsely controlled power load, managed manually with a simple on-off switch. With
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Date:
05/21/2012
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Figure 1: Incandescent light bulbs (blue curves) are purely resistive, LEDs (red curves) are not.
LEDs are gaining significant traction in the lighting market due to their long operating lifetime, low running cost, and ease of control for specific applications.
However, in order to realize
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Date:
05/20/2012
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Figure 1: The LT3791 Driving a 3 A LED Array at up to 100 W
Incandescent light bulbs waste 90% of the energy they consume in the form of heat.
The light outputs from HB (high-brightness) LEDs have already exceeded the critical milestone of 100 lm/W. In fact,
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Date:
05/20/2012
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Figure 1: Resonant driver for high-power LED-lighting applications.
Solid-state lighting applications such as streetlights and industrial lighting demand drivers that offer better efficiency than the traditional flyback topology in the 50—250 W power range.
As
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Date:
05/19/2012
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Figure 1: One-Stage Approach: The driver converts an AC-rectified line voltage to the necessary DC current through a flyback transformer and filter. Unfortunately, the rectified voltage contains ripple at twice the line frequency (100 or 120 Hz).
The SSL (solid-state lighting) industry is in a state of excitement mixed with trepidation.
With the obvious need for lighting more efficient than traditional incandescents, key market drivers
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Date:
05/19/2012
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