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http://dx.doi.org/10.6113/JPE.2014.14.5.815

Improved Bridgeless Interleaved Boost PFC Rectifier with Optimized Magnetic Utilization and Reduced Sensing Noise  

Cao, Guoen (Department of Electronic Systems Engineering, Hanyang University)
Kim, Hee-Jun (Department of Electronic Systems Engineering, Hanyang University)
Publication Information
Journal of Power Electronics / v.14, no.5, 2014 , pp. 815-826 More about this Journal
Abstract
An improved bridgeless interleaved boost power factor correction (PFC) rectifier to improve power efficiency and component utilization is proposed in this study. With combined conventional bridgeless PFC circuit and interleaved technology, the proposed rectifier consists of two interleaved and magnetic inter-coupling boost bridgeless converter cells. Each cell operates alternatively in the critical conduction mode, which can achieve the soft-switching characteristics of the switches and increase power capacity. Auxiliary blocking diodes are employed to eliminate undesired circulating loops and reduce current-sensing noise, which are among the serious drawbacks of a dual-boost PFC rectifier. Magnetic component utilization is improved by symmetrically coupling two inductors on a unique core, which can achieve independence from each other based on the auxiliary diodes. Through the interleaved approach, each switch can operate in the whole line cycle. A simple control scheme is employed in the circuit by using a conventional interleaved controller. The operation principle and theoretical analysis of the converter are presented. A 600 W experimental prototype is built to verify the theoretical analysis and feasibility of the proposed rectifier. System efficiency reaches 97.3% with low total harmonic distortion at full load.
Keywords
Bridgeless; Circulating current; Coupled inductor; Interleaved boost; Magnetic integration; Power factor correction (PFC); Soft switching;
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