Single-Stage Bridgeless LED Driver Based on a CLCL Resonant Converter

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Abstract
This paper presents a single-stage light emitting diode (LED) driver based on a bridgeless power factor correction (PFC) converter and a half-bridge CLCL resonant converter, for street lighting applications. The proposed single-stage topology integrates the PFC converter and the CLCL resonant converter by sharing active power switches. The bridgeless PFC converter adopts two buck-boost circuits operating in discontinuous conduction mode (DCM) to achieve input-current shaping. It uses two diodes instead of a rectifier bridge to reduce the power loss caused by the diodes. Owing to its superior soft-switching characteristics, the CLCL resonant converter is used. The proposed LED driver has superior features such as high efficiency, near unity power factor, low total harmonic distortion (THD), and relatively few diodes. A 100W lab prototype is successfully implemented and the experimental results verify the effectiveness and feasibility of the proposed LED driver.
Funding Information
  • National Natural Science Foundation of China (51407044, 51777038)
  • Fundamental Research Funds for the Central Universities (HIT.BRETIII.201510)
  • China Postdoctoral Science Foundation (2014M550187, 2015T80348)
  • National High Technology Research and Development Program 863 of China (2015AA050603)
  • Natural Science Foundation of Heilongjiang Province (E2015009)
  • Lite-On Power Electronics Technology Research Fund

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