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Power Supplies for LED Driving, 2nd Edition by Steve Winder

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Chapter 8

Nonisolated Power Factor Correction Circuits

Abstract

This chapter discusses the need for a good power factor and how it can be achieved by power factor correction or other means. A traditional boost converter type of power factor correction circuit, where the output is a fixed high voltage, is described first. This circuit could be used in combination with a buck constant current switching circuit to drive a string of light-emitting diodes. A more integrated boost stage and linear regulator, with a constant current output, is described. Other more exotic schemes are described, with one design example.

Keywords

power factor
power factor correction
PFC
boost
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