[논문]넓은 공극범위에서 소프트스위칭 동작하는 무선전력 충전시스템

문유진; 우정원; 김은수; 황인갑; 원종섭; 강성수

doi:10.6113/tkpe.2022.27.6.515

넓은 공극범위에서 소프트스위칭 동작하는 무선전력 충전시스템
Wireless Power Charging System Capable of Soft-Switching Operation Even in Wide Air Gaps 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.27 no.6, 2022년, pp.515 - 525

문유진 (Electrical & Electronics Engineering, Jeonju University) , 우정원 (Electrical & Electronics Engineering, Jeonju University) , 김은수 (Dept. of Electrical & Electronics Engineering, Jeonju University) , 황인갑 (Electrical & Electronics Engineering, Jeonju University) , 원종섭 (Mechanical and Automotive Engineering, Jeonju University) , 강성수 (Mechanical and Automotive Engineering, Jeonju University)

Abstract ▼ AI-Helper

The wireless power transfer (WPT) charging system for AGV depends highly on the coupling conditions due to air gap variation. To attain stable output power with high transfer efficiency under various coupling conditions, a single-stage, DC-DC converter that operates with robustness to changes in air gaps is proposed for the WPT system. The proposed converter is capable of soft switching under the set input voltage (Vin: 380 VDC), load conditions (0-1 kW), and air gap changes (30-70 mm). In addition, a wide output voltage range (Vo: 39-54 VDC) can be controlled by varying the link voltage due to the phase control at a fixed switching frequency. Experimental results are verified using a prototype of a 1 kW wireless power charging system.

주제어

표/그림 (18)

그림 Fig. 1. (a) Multi-stage DC-DC converter for AGVs WPT charging system, (b) gain characteristics and (d) terminal voltage/current waveforms(V_P,I_P) due to the air-gap variation
그림 Fig. 2. (a) Full-bridge phase shift DC-DC converter for AGVs WPT charging system, and (b), (c) voltage/current waveforms(V_P/I_P, V_Q3/I_Q3) of the primary/secondary terminal and switching device Q3 due to the controlled output voltage(V_B)
그림 Fig. 3. The proposed single stage DC-DC converters for WPT and its operating waveforms
그림 Fig. 4. Operating modes of proposed single stage DC-DC converter. (a) t₀~t₁, (b) t₁~t₂, (c) t₂~t₃, (d) t₃~t₄ (e) t₄~t₅, (f) t₅~t₆
그림 Fig. 5. Waveforms of boost inductor current/voltage[(I_B1, I_B2)/(V_LB1, V_LB2)] and input voltage(V_in), link voltage (V_Link) and the averaged boost inductor reset current (< I_Link1>, < I_Link2>) in the (a) discontinuous and, (b) continuous modes
그림 Fig. 6. The simulated DC link voltage (VLink) of a single stage DC/DC converter operating with different boost inductances(L_B: 100 uH, 110 uH, 120 uH) at full load (54 VDC, 1 kW).
그림 Fig. 7. Equivalent circuit of SS compensation circuit
그림 Fig. 8. Couplers for WPT in (a) full-bridge DC-DC converter and (b) single stage DC-DC converter
표 TABLE I PARAMETERS OF THE LOOSELY COUPLED TRANSFORMER FOR WPT USING THE FULL BRIDGE DC-DC CONVERTER
표 TABLE II PARAMETERS OF THE LOOSELY COUPLED TRANSFORMER FOR WPT USING THE SINGLE-STAGE DC-DC CONVERTER
그림 Fig. 9. Gain characteristics of SS compensation circuit under load condition (1 kW) according to air-gap(30 mm, 50 mm, 70 mm)in (a) full-bridge DC-DC converter and (b) single stage DC-DC converter
그림 Fig. 10. (a), (b) Operating modes and (c) waveforms of proposed converter when the leading current in the primary is flowing
그림 Fig. 11. Experimental waveforms of (a) boost inductor currents(I_B1,I_B2), the summing voltages(V_LB2+V_CFb,V_LB1+V_CFa), (b) V_P/I_P and V_S/I_S in conditions of the airgap 50 mm and 39 V_DC/1 kW
표 TABLE III MAIN INPUT/OUTPUT SPECIFICATIONS AND THE USED DEVICES
그림 Fig. 12. Experimental waveforms of (a)boost inductor currents(I_B1,I_B2), the summing voltages(V_LB2+V_CFb,V_LB1+V_CFa), (b)V_P/I_P and V_S/I_S in conditions of the air-gap 50 mm and 48 V_DC/1 kW
그림 Fig. 13. Experimental waveforms of (a)boost inductor currents(I_B1, I_B2), the summing voltages(V_LB2+V_CFb,V_LB1+V_CFa), (b)V_P/I_P and V_S/I_S in conditions of the air-gap 50 mm and 54 V_DC/1 kW
그림 Fig. 14. Experimental waveforms of (a)boost inductor currents(I_B1,I_B2), the summing voltages(V_LB2+V_CFb,V_LB1+V_CFa), (b)V_P/I_P and V_S/I_S in conditions of the air-gap 30 mm and 39 V_DC/1 kW
그림 Fig. 15. Efficiency characteristics of the proposed single stage DC/DC converter 1 for WPT with 50 mm air-gap

참고문헌 (10)

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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
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