The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Three Level Single-Phase Single Stage AC/DC Resonant Converter With A Wide Output Operating Voltage Range

넓은 출력 전압제어범위를 갖는 3레벨 단상 단일전력단 AC/DC 컨버터

  • Marius, Takongmo (Dept. of Electrical & Electronics Engineering, Jeonju University) ;
  • Kim, Min-Ji (Dept. of Electrical & Electronics Engineering, Jeonju University) ;
  • Oh, Jae-Sung (Dept. of Electrical & Electronics Engineering, Jeonju University) ;
  • Lee, Gang-Woo (Dept. of Electrical & Electronics Engineering, Jeonju University) ;
  • Kim, Eun-Soo (Dept. of Electrical & Electronics Engineering, Jeonju University) ;
  • Hwang, In-Gab (Dept. of Electrical & Electronics Engineering, Jeonju University)
  • Received : 2018.09.10
  • Accepted : 2018.10.31
  • Published : 2018.12.20
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Abstract

This study presents a single-phase single-stage three-level AC/DC converter with a wide controllable output voltage. The proposed AC/DC converter is designed to extend the application of e-mobility, such as electric vehicles. The single-stage converter integrates a PFC converter and a three-level DC/DC converter, operates at a fixed frequency, and provides a wide controllable output voltage (approximately 200-430Vdc) with high efficiencies over a wide load range. In addition, the input boost inductors operate in a discontinuous mode to improve the input power factor. The switching devices operate with ZVS, and the converter's THD is small, especially at full load. The feasibility of the proposed converter is verified by the experimental results of a 1.5 kW prototype.

Keywords

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Fig. 1. The proposed single-phase single-stage 3-level AC/DC converter and its operating waveforms.

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Fig. 2. Current flow in mode 1 (t0∼t1).

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Fig. 3. Current flow in mode 2 (t1∼t2).

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Fig. 4. Current flow in mode 3 (t2∼t3).

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Fig. 5. Current flow in mode 4 (t3∼t4).

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Fig. 6. Current flow in mode 5 (t4∼t5).

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Fig. 7. Current flow in mode 6 (t5∼t6).

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Fig. 8. Current flow in mode 7 (t6∼t7).

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Fig. 9. Current flow in mode 8 (t7∼t8).

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Fig. 10. Boost inductor’s current waveform.

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Fig. 11. Boost inductor’s waveforms in the interval 0≤θ≤∅cr.

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Fig. 12. Boost inductor’s waveforms in the interval ∅cr≤θ≤(π-∅cr).

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Fig. 13. Voltage gain characteristics [M(LB, D)] as a function of the boost inductance (LB) and phase-shift(D) of a single -phase single stage AC/DC converter.

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Fig. 14. Equivalent circuit of the resonant tank.

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Fig. 15. Voltage gain of the resonant tank.

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Fig. 16. VLINK voltage simulation.

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Fig. 17. Experimental wave-forms. (a) the PFC Circuit, (b) the current/ voltage across the transformer's primary and secondary [200V/1.5kW].

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Fig. 18. Experimental wave-forms. (a) the PFC Circuit, (b) the current/ voltage across the transformer's primary and secondary [300V/1.5kW].

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Fig. 19. Experimental wave-forms. (a) the PFC Circuit, (b) the current/ voltage across the transformer's primary and secondary [430V/1.5kW].

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Fig. 20. Measured link voltage (VLINK) of the designed prototype.

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Fig. 21. Efficiency and THD of the proposed single-phase single stage AC/DC converter.

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Fig. 22. Setup of the laboratory prototype.

TABLE I MAIN RATINGS AND TRANSFORMER PARAMETERS

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