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

  • 제24권4호
  • /
  • Pages.259-267
  • /
  • 2019
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  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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GaN-FET 기반의 고효율 및 고전력밀도 경계전류모드 능동 클램프 플라이백 컨버터 최적설계

Optimal Design of GaN-FET based High Efficiency and High Power Density Boundary Conduction Mode Active Clamp Flyback Converter

  • 투고 : 2018.10.11
  • 심사 : 2019.01.09
  • 발행 : 2019.08.20
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초록

An active clamp flyback (ACF) converter applies a clamp circuit and circulates the energy of leakage inductance to the input side, thereby achieving a zero-voltage switching (ZVS) operation and greatly reducing switching losses. The switching losses are further reduced by applying a gallium nitride field effect transistor (GaN-FET) with excellent switching characteristics, and ZVS operation can be accomplished under light load with boundary conduction mode (BCM) operation. Optimal design is performed on the basis of loss analysis by selecting magnetization inductance based on BCM operation and a clamp capacitor for loss reduction. Therefore, the size of the reactive element can be reduced through high-frequency operation, and a high-efficiency and high-power-density converter can be achieved. This study proposes an optimal design for a high-efficiency and high-power-density BCM ACF converter based on GaN-FETs and verifies it through experimental results of a 65 W-rated prototype.

키워드

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Fig. 1. Active clamp flyback converter.

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Fig. 2. Key waveforms of boundary conduction mode active clamp flyback converter.

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Fig. 3. Operation modes of active clamp flyback converter.

TABLE Ⅰ COMPARISON OF Si-FET AND GaN-FET

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Fig. 5. Resonant equivalent circuit during M2 conduct.

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Fig. 7. Total loss comparison according to the number of turns and switching frequency at 5:1 turn ratio.

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Fig. 8. Efficiency according to turn ratio and switching frequency.

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Fig. 9. 65W-Prototype of boundary conduction mode active clamp flyback converter(53.3mm x 54.5mm x 20mm).

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Fig. 11. Efficiency by load of boundary conduction mode active clamp flyback converter according to input voltage.

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Fig. 10. Steady state key experiment waveforms of boundary conduction mode active clamp flyback converter according to input voltage.

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Fig. 4. Loss comparison of Si-FET and GaN-FET.

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Fig. 6. Active clamp flyback converter with LC filter.

TABLE Ⅱ EQUATIONS FOR LOSS ANALYSIS

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TABLE Ⅲ KEY PARAMETERS APPLIED TO THE BCM ACF CONVERTER

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참고문헌

  1. J. Park, et al., "Quasi-resonant (QR) controller with adaptive switching frequency reduction scheme for flyback converter," in IEEE Transactions on Industrial Electronics, Vol. 63, No. 6, pp. 3571-3581, Jun. 2016. https://doi.org/10.1109/TIE.2016.2523931
  2. R. Watson, F. C. Lee, and G. C. Hua, "Utilization of an active-clamp circuit to achieve soft switching in flyback converters," in Proc. IEEE-PESC Annu. Meeting, pp. 909-916, 1994.
  3. X. Huang, J. Feng, W. Du, F. Lee, and Q. Li, "Design consideration of MHz active clamp flyback converter with GaN devices for low power adapter application," in Proc. APEC 2016, pp. 2334-2341, 2016.
  4. T. Shenpeng, X. Jianxiong, and H. Lenian, "A GaN-based MHz active clamp flyback converter with adaptive dual edge dead time modulation for AC-DC adapters," in Proc. IECON 2017, pp. 546-553, 2017.
  5. L. Xue and J. Zhang, "Highly-efficient secondary resonant active clamp flyback converter," in IEEE Transactions on Industrial Electronics, Vol. 65, No. 2, Feb. 2018.
  6. L. Xue and J. Zhang, "Active clamp flyback using GaN power IC for power adapter applications," in Proc. 2017 IEEE Applied Power Electronics Conf. Exp., Tampa, FL, 2017, pp. 2441-2448, 2017.
  7. L. Xue and J. Zhang, "Design considerations of highly-efficient active clamp flyback converter using GaN power ICs," in Proc. APEC 2018, pp. 777-782, 2018.
  8. Z. Yajing, T. Q. Zheng, and L. Yan, "Loss analysis and soft-switching characteristics of flyback-forward high gain DC/DC converter with GaN-FET," Power Electronics Conference (IPEC- Hiroshima 2014 - ECCE-ASIA), 2014 International, pp. 2899-2903, May 2014.
  9. C. W. T. Mclyman, Transformer and inductor design handbook, Marcel Dekker, 2004.