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고효율 및 소형 스위치모드 라인 트랜스포머

High Efficiency and Small Size Switch Mode Line Transformer(SMLT)

  • 투고 : 2018.10.04
  • 심사 : 2019.01.24
  • 발행 : 2019.08.20

초록

A high-efficiency and small-sized switched-mode line transformer (SMLT) is proposed in this study. The conventional structure of an adapter is composed of line transformer and rectifiers. This structure has a limit in miniaturizing due to low-frequency line transformer. Another structure is composed of power factor correction (PFC) and DC/DC converter. This structure has a limit in reducing volume due to two-stage structure. As the proposed SMLT is composed of an LLC resonant converter, a high-frequency transformer can be adopted to achieve isolation standards and size reduction. This proposed structure has different operation modes in accordance with line input voltage to overcome poor line regulation. In addition, the proposed SMLT is applied to the front of a conventional PFC converter, because the SMLT output voltage is restored to rectified sinusoidal wave by using a full-bridge rectifier in the secondary side. The design of the PFC converter is easy, because the SMLT output voltage is controlled as rectified sinusoidal wave. The validity of the proposed converter is proven through a 350 W prototype.

키워드

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Fig. 1. Conventional line transformer and adaptor.

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Fig. 2. A proposed switch mode line transformer(SMLT).

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Fig. 3. Frequency range for required output voltage according to input voltage.

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Fig. 5. Input and output voltage detection of proposed SMLT.

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Fig. 6. Design flow chart of resonant tank.

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Fig. 7. Experimental wave form by input voltage.

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Fig. 8. Comparison conventional PFC DC/DC converter and a proposed SMLT 350W prototype.

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Fig. 4. Voltage gain according to input voltage.

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Fig. 9. Experimental wave form of input voltage change.

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Fig. 10. Efficiency of a proposed SMLT according to load condition.

TABLE I DIFFERENT TOPOLOGY OF PROPOSED SMLT ACCORDING TO INPUT VOLTAGE

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TABLE Ⅱ CONTROL METHOD AND KEY WAVEFORM OF PROPOSED SMLT

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TABLE Ⅲ SPECIFICATION AND COMPONENT OF A SMLT

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참고문헌

  1. B. Lu, et al., "Optimal design methodology for LLC resonant converter," in Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, APEC '06, 2006.
  2. H. Hu, X. Fang, F. Chen, Z. J. Shen, and I. Batarseh, “A modified high-efficiency LLC converter with two transformers for wide inpu-voltage range applications,” IEEE Trans Power electronics., Vol. 28, No. 4, pp. 1946-1960, Apr. 2013. https://doi.org/10.1109/TPEL.2012.2201959
  3. 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, Jun. 2017. https://doi.org/10.1109/TPEL.2016.2602545
  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, Mar. 2016. https://doi.org/10.1109/TPEL.2015.2440099
  5. J. H. Kim, C. E. Kim, J. K. Kim, J. B. Lee, and G. W. Moon, "Analysis on load-adaptive phase-shift control for high efficiency full-bridge LLC resonant converter under light-load conditions," IEEE Trans. Power Electronics. Vol. 31, No. 7, pp. 4942-4955, Jul. 2016. https://doi.org/10.1109/TPEL.2015.2462077
  6. S. De Simone, C. Adragna, C. Spini, and G. Gattavari, "Design-oriented steady-state analysis of LLC resonant converters based on FHA," in International Symposium on Power Electronics, Electrical Drives, Automation a nd Motion, SPEEDAM, 2006.
  7. S. Abdel-Rahman, "Resonant LLC converter : Operation and design," Infineon Technologies application note AN 2012-09, Retrieved from https://www.infineon.com/dgdl/Infineon-Design_example_resonant_LLC_converter_operation_and_design-AN-v01_00-EN.pdf?fileId=db3a30433a047ba0013a4a60e3be64a1.