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Power Converters with Digital Filter Feedback Control by Keng C. Wu

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Chapter 6

LED Driver

Abstract

Being intrinsically a semiconductor diode, LED is driven only in one direction by the DC source instead of AC. Existing AC supply must be processed to be suitable for driving LED. It turns out that while in theory, LEDs have the advantage of a long operation life, the power converters, often the AC–DC, actually have worse reliability and become the weakest link.

With that in mind, this chapter treats power converters specifically designed for driving LEDs in a single string or in an array form. The converter may look like it is in a forward, buck configuration, but it differs by regulating the output current rather than the output voltage.

LED loads also differ from resistive loads. This chapter treats the LED model ...

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