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

  • 제24권4호
  • /
  • Pages.294-302
  • /
  • 2019
  • /
  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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넓은 출력전압 제어범위에서 동작하는 보조스위치 적용 공통커패시터 연결 LLC 공진컨버터

A Common Capacitor Connected LLC Resonant Converter with Auxiliary Switches Operating Over a Wide Output Voltage Control Range

  • Oh, Jae-Sung (Electrical & Electronics Engineering, Jeonju University) ;
  • Kim, Min-Ji (Electrical & Electronics Engineering, Jeonju University) ;
  • Lee, Ji-Cheol (Electrical & Electronics Engineering, Jeonju University) ;
  • Kim, Eun-Soo (Electrical & Electronics Engineering, Jeonju University) ;
  • Jeon, Yong-Seog (Electrical & Electronics Engineering, Jeonju University) ;
  • Kook, Yoon-Sang (PACTECH CO.,LTD)
  • 투고 : 2018.10.10
  • 심사 : 2019.06.18
  • 발행 : 2019.08.20
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초록

A capacitor common connected LLC resonant converter with auxiliary switches for a wide output voltage control range is presented in this paper. The proposed converter can be controlled in two ways to achieve a wide output voltage control range of Vo-3Vo. The first control method is performed through pulse width modulation of the auxiliary switches and primary switching devices. The second control method is conducted through frequency modulation of the primary switching devices configured to operate in full-bridge switching modes, when the auxiliary switches are turned off. The feasibility of the proposed converter is verified by the experimental results of a 5 kW prototype.

키워드

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Fig. 3. PM Operating modes of Mode-1, and Its waveforms.

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Fig. 4. (a) FM Operating modes of Mode-2, (b) Its waveforms.

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Fig. 6. Voltage gain characteristics due to load variation in each operating mode (Mode-1. Mode-2).

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Fig. 7. Digital implementation of PM/FM control (a) Block diagram, (b) Key waveforms.

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Fig. 8. Experimental waveforms of voltage (Vab, VS11) /current(IP1, IS1) across the primary and secondary terminals of the converter [Mode-1[PM(Pulse-width Modulation)]. [Ch1:500V/Div, Ch2:5A/Div, Ch3:250V/div, Ch4:5A/Div, Time:1us/Div]

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Fig. 10. Experimental waveforms of the terminal voltages (Vab, VS11)/rectified currents(IS1, IS2) of the converter operating in PM mode(300Vdc). [Ch1:500V/Div, Ch2:5A/Div, Ch3:250V/div, Ch4:5A/Div, Time:1us/Div]

JRJJC3_2019_v24n4_294_f0007.png 이미지

Fig. 9. Experimental waveforms of voltage (Vab, VS11) /current(IP1, IS1) across the primary and secondary terminals of the converter [Mode-2[FM(Frequency Modulation)]. [Ch1:500V/Div, Ch2:5A/Div, Ch3:250V/div, Ch4:5A/Div, Time:1us/Div]

JRJJC3_2019_v24n4_294_f0008.png 이미지

Fig. 11. Experimental waveforms of the terminal voltages (Vab, VS11)/rectified currents(IS1, IS2) of the converter operating in FM mode(400Vdc). [Ch1:500V/Div, Ch2:5A/Div, Ch3:250V/div, Ch4:5A/Div, Time:1us/Div]

JRJJC3_2019_v24n4_294_f0009.png 이미지

Fig. 12. Measured waveforms for output voltage transitions between 240Vdc and 445 Vdc at VIN = 650Vdc and constant output current Io(2A) (Ch 1: 500V/Div, Ch 3: 100V/Div, Time: 2s/Div).

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Fig. 13. 5kW 3-bridge LLC resonant converter.

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Fig. 14. Efficiency characteristics in the PM/FM mode.

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Fig. 1. (a) 3-bridge LLC resonant converter, (b) Its gain characteristics.

JRJJC3_2019_v24n4_294_f0013.png 이미지

Fig. 2. (a) 3-bridge LLC resonant converter using the primary auxiliary switches, (b) Its gain characteristics.

JRJJC3_2019_v24n4_294_f0014.png 이미지

Fig. 5. Operation of 3-bridge LLC converter for the theoretic analysis of voltage gain: (a), (b) voltage waveforms across the primary and secondary terminals, (c), (d) Its equivalent circuits.

TABLE I MAJOR RATINGS IN THE PROPOSED CONVERTER

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TABLE II PARAMETERS OF RESONANT CIRCUIT

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참고문헌

  1. R. Beiranvand, B. Rashidian, M. R. Zolghadri, and S. M. H. Alavi, “Using LLC resonant converter for designing wide-range voltage source,” IEEE Transactions on Power Electronics, Vol. 58, No. 5, pp. 1746-1756, 2011.
  2. F. Musavi, M. Craciun, D. S. Gautam, and W. Eberle, "Control strategies for wide output voltage range LLC resonant DC-DC converters in battery chargers," IEEE Transactions on Vehicular Technology, Vol. 63, No. 3, Mar. 2014.
  3. J. Deng, C. C. Mi, R. Ma, and S. Li, “Design of LLC resonant converters based on operation-mode analysis for level two PHEV battery chargers,” IEEE/ASME Transactions on Mechatronics, Vol. 20, No. 4, pp. 1595-1606, 2015. https://doi.org/10.1109/TMECH.2014.2349791
  4. M. M. Jovanovic and B. T. Irving, “On-the-fly topology-morphing control-efficiency optimization method for LLC resonant converters operating in wide input- and/or output-voltage range,” IEEE Transactions on Power Electronics, Vol. 31, No. 3, pp. 2596-2608, 2016. https://doi.org/10.1109/TPEL.2015.2440099
  5. H. Wang, Y. Chen, Z. Hu, L. Wang, Y. Qiu, W. Liu, Y. F. Liu, J. Afsharian, and Z. Yang, "A common capacitor multi-phase LLC resonant converter," IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 2320-2327, 2016.
  6. X. Sun, X. Li, Y. Shen, B. Wang, and X. Guo, "Dual-bridge LLC resonant converter with fixed-frequency PWM control for wide input applications," IEEE Transactions on Power Electronics, Vol. 32, pp. 69-80, Jan. 2017. https://doi.org/10.1109/TPEL.2016.2530748
  7. H. Wu, X. Zhan, and Y. Xing, “Interleaved LLC resonant converter with hybrid rectifier and variable-frequency plus phase-shift control for wide output voltage range applications,” IEEE Transactions on Power Electronics, Vol. 32, No. 6, pp. 4246-4257, 2017. https://doi.org/10.1109/TPEL.2016.2602545
  8. H. Haga and F. Kurokawa, "Modulation method of a full-bridge three-level LLC resonant converter for battery charger of electrical vehicles," IEEE Transactions on Power Electronics, Vol. 32, No. 4, Apr. 2017.