[논문]넓은 공극 범위에서도 안정된 소프트 스위칭 동작 가능한 개선된 무선 전력 충전 시스템

우정원; 문유진; 김은수

doi:10.6113/tkpe.2022.27.3.180

넓은 공극 범위에서도 안정된 소프트 스위칭 동작 가능한 개선된 무선 전력 충전 시스템
An Improved Wireless Power Charging System Capable of Stable Soft-Switching Operation Even in Wide Air Gaps 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.27 no.3, 2022년, pp.180 - 191

우정원 (Dept. of Electrical & Electronics Engineering, Jeonju University) , 문유진 (Dept. of Electrical & Electronics Engineering, Jeonju University) , 김은수 (Dept. of Electrical & Electronics Engineering, Jeonju University)

Abstract ▼ AI-Helper

In this paper, a single-stage alternating current (AC)-DC converter is proposed for the automated-guided vehicle wireless charging system. The proposed converter is capable of soft-switching under all input voltage (VAC: 220 Vrms ± 10%), load conditions (0-1 kW), and air gap changes (40-60 mm) by phase control at a fixed switching frequency. In addition, controlling a wide output voltage (Vo: 39~54 VDC) is possible by varying the link voltage and improving the input power factor and the total harmonic distortion factor. Experimental results were verified by making a prototype of a 1-kW wireless power charging system that operates with robustness to changes in air gaps.

주제어

표/그림 (23)

그림 Fig. 1. (a) and (b) conventional single-stage AC-DC converters for WPT AGVs charging system, (c) and (d) their terminal voltage waveforms (V_ab, V_P).
그림 Fig. 2. The proposed single stage AC-DC converter for WPT and its operating waveforms.
그림 Fig. 3. Operating modes 1 (t₀–t₁) of proposed converter.
그림 Fig. 4. Operating modes 2 (t₁–t₂) of proposed converter.
그림 Fig. 5. Operating modes 3 (t₂–t₃) of proposed converter.
그림 Fig. 6. Operating modes 4 (t₃–t₄) of proposed converter.
그림 Fig. 7. Operating modes 5 (t₄–t₅) of proposed converter.
그림 Fig. 8. Operating modes 6 (t₅–t₆) of proposed converter.
그림 Fig. 9. Waveforms of boost inductor current (I_B) and AC line input voltage/current (V_AC/I_a), link voltage (V_Link) and boost inductor reset current (I_Link).
그림 Fig. 10. The simulated DC link voltage (V_Link) of a single-phase single stage AC-DC converter operating with different boost inductances (L_B: 15 uH, 20 uH, 25 uH) at full load (54 V_DC, 1 kW).
그림 Fig. 11. Equivalent circuit of SS compensation circuit.
그림 Fig. 12. Gain Characteristics of series-series compensation resonant circuit due to load conditions and air-gap.
그림 Fig. 13. Operating modes and waveforms of proposed converter when the leading current in the primary is flowing.
그림 Fig. 14. Loosely coupled transformer coupler for wireless power transfer.
그림 Fig. 15. Experimental waveforms of (a) the PFC circuit and (b) the current/voltage across the loosely coupled transformer's primary and secondary [50 mm/39 VDC/75 W].
그림 Fig. 16. Experimental waveforms of (a) the PFC circuit and (b) the current/voltage across the loosely coupled transformer's primary and secondary [50 mm/39 VDC/1 kW].
표 TABLE I PARAMETERS OF THE LOOSELY COUPLED TRANSFORMER FOR WPT
표 TABLE II MAIN INPUT/OUTPUT SPECIFICATIONS AND THE USED DEVICES
그림 Fig. 17. Experimental waveforms of (a) the PFC circuit and (b) the current/voltage across the loosely coupled transformer's primary and secondary [50 mm/48 VDC/1 kW].
그림 Fig. 18. Experimental waveforms of (a) the PFC circuit and (b) the current/voltage across the loosely coupled transformer's primary and secondary [50 mm/54 VDC/1 kW].
그림 Fig. 19. Experimental waveforms of (a) V_P/I_P and V_LB⁺V_CFb/I_B, (b) V_P/I_P and V_LB⁺V_CFa/I_B when the leading current in the primary is flowing, in conditions of the air-gap 40 mm and misalignment 0 mm, 39 V_DC/1 kW.
그림 Fig. 20. Link voltage (V_Link) characteristics according to the change of air gap (40, 50, 60 mm) between the primary and secondary of the coupler under the output voltage (V_o) 54 V_DC control condition.
그림 Fig. 21. (a) Efficiency and (b) input power factor (PF) and THDi characteristics of the proposed single stage AC-DC converter for WPT with 50 mm air-gap.

참고문헌 (9)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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원문보기 상세보기
J. W. Woo, K. C. Jang, E. S. Kim, "Single-stage AC/DC converter for wireless power transfer operating with robustness in wide air gaps," The Transactions of the Korean Institute of Power Electronics, Vol. 26, No. 2, pp. 141-149, Apr. 2021.

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