Abstract

The importance of power-factor correction and the related line-harmonics reduction is increasing as the amount of line-fed electronic equipment grows and the requirements of regulatory agencies tighten. This paper presents a comprehensive overview of power-factor correction in single-phase off-line switching-mode power supplies, including the definition of power factor and its relation to total harmonic distortion; the IEC 555-2 requirements; many passive and active power-factor corrector topologies and control methods; modelling issues; and practical considerations.

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