Abstract
With high input voltage or light load, the peak of AC line current for critical conduction mode (CRM) flyback power factor Correctors (PFCs) appears notably distorted. In this paper, the reasons of line current distortion are investigated. Moreover, the relationship between line current peak distortion and high input voltage or light load is presented. Based on theoretical analysis, a simple improved control strategy is proposed. Finally, an experiment is carried out and the results convincingly demonstrate the effectiveness of the proposed method for reducing line current peak distortion.
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