Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Bridgeless Buck PFC Rectifier with Improved Power Factor

  • Malekanehrad, Mahdi (Department of Electrical and Computer Engineering, Isfahan University of Technology) ;
  • Adib, Ehsan (Department of Electrical and Computer Engineering, Isfahan University of Technology)
  • Received : 2017.02.15
  • Accepted : 2017.08.27
  • Published : 2018.03.20
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Abstract

Buck power factor correction (PFC) converters, compared with conventional boost PFC converters, exhibit high efficiency performance in the entire range of universal line voltage. This feature has gotten more attention for eliminating the zero crossing dead angle of buck PFC rectifiers. Furthermore, bridgeless structures for the reduction of conduction losses have been proposed. The aim of this paper is to introduce a single-phase buck rectifier that simultaneously has unity power factor (PF) and bridgeless structure while operating in the continuous conduction mode (CCM). For this purpose, two auxiliary flyback converters without any active switches are applied to a bridgeless buck rectifier to eliminate the zero crossing dead angle and achieve unity power factor, low total harmonic distortion (THD) and high efficiency. The operation and design considerations of the proposed rectifier are verified on a 150W, 48V prototype using a conventional peak-current-mode control. The measurement results show that the proposed rectifier has nearly unity power factor, THD less than 7% and high efficiency.

Keywords

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Fig. 1. Proposed bridgeless unity power factor buck rectifier.

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Fig. 2. Operation of the positive and negative half-line cycles. (a)Positive half-line cycle. (b) Negative half-line cycle.

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Fig. 3. Theoretical key waveforms.

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Fig. 4. Equivalent circuits of the three modes during the positivehalf-line cycle. (a) Mode 1. (b) Mode 2. (c) Mode 3.

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Fig. 5. An equivalent circuit of the second mode.

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Fig. 6. Schematic of the implemented circuit.

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Fig. 7. Measured line waveforms at Po=150 W. (a) Line current and voltage waveforms (time: 5 ms/div). (b) Measured odd harmoniccomponents of the line current with the Class D requirements of JIS C 6100-3-2.

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Fig. 8. Measured waveforms at Po=150 W. (a) Low frequency voltages (10 V/div; time: 5 ms/div). (b) Switching currents at the peak ofthe line voltage (8 A/div; time: 10 μs/div). (c) Switching voltages at the peak of the line voltage (time: 10 μs/div).

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Fig. 9. Measured ef？ciency, PF and THD compared with outputpower.

TABLE I COMPARISON OF THE PROPOSED RECTIFIER AND THE TOPOLOGIES IN [21]-[25]

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TABLE II COMPARISON OF THE PF, THD AND EFFICIENCY OF THE PROPOSED RECTIFIER AND STATE-OF-THE-ART BUCK RECTIFIERS FOR 110 VAC LINE VOLTAGE

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