本論文所提之推挽式功率因數修正器可以工作於準諧振模式或導通模式。於準諧振模式操作時，由於開關具有準諧振波谷切換，且輸出二極體具有零電流截止，因此能減少切換損失並提升轉換效率。於不連續導通模式操作時，具有定頻工作、輸出二極體零電流截止、自然功率因數修正、控制電路簡單與EMI設計容易之特點。本論文詳細分析與敘述此兩種模式之電路理論與設計方法，且透過模擬與實作結果，驗證所提功率因數修正器之可行性。實作一通用交流電壓輸入、輸出380 V/300 W之雙模推挽式升壓型功率因數修正器，在交流輸入電壓100 Vac與220 Vac之最低效率分別為94.4%與96.7%。

The operations of the proposed dual-mode push-pull boost power factor corrector can be under either quasi-resonant (QR) mode or discontinuous conduction mode (DCM). For QR mode operation, the valley-switching on the switch and zero-current-switching (ZCS) of the output diode can reduce the switching losses and improve the conversion efficiency. On the other hand, the DCM operation features fixed switching frequency, ZCS of the output diode, natural PFC function, simplified control methodology and EMI filter design. Circuit principles and design procedures are presented and verified by the simulations and experimental results. A prototype is then implemented with universal line voltage, a 380 V output DC voltage 380 V and 300 W power rating. The minimum efficiencies at line voltages of 100Vac and 220Vac are 94.4% and 96.7%, respectively.

[1] Electromagnetic Compatibility, Part 3, Section 2. Limits for harmonic current emissions (equipment input current ≤16A per phase), EN 61000-3-2.
[2] J. Lai and D. Chen, “Design consideration for power factor correction boost converter operating at the boundary of continuous conduction mode and discontinuous conduction mode,” IEEE Applied Power Electronics Conference, 1993 Record, pp. 267-273, 1993.
[3] ST Microelectronics, “L6561, Enhanced transition mode power factor corrector,” AN966, Application Note, March 2003.
[4] J. D. Zhang, J. W. Shao, P. Xu, F. C. Lee, and M. M. Jovanovic', “Evaluation of input current in the critical mode boost PFC converter for distributed power systems,” IEEE Applied Power Electronics Conference and Exposition, Sixteenth Annual, 2001, vol. 1, pp. 130-136, 4-8 March 2001.
[5] L. Huber, B. T. Irving, and M. M. Jovanovic', “Line current distortions of DCM/CCM boundary boost PFC converter,” IEEE Applied Power Electronics Conference and Exposition, Twenty-Third Annual, 2008, pp. 702-708, 24-28 Feb. 2008.
[6] M. Shen, Z. Qian, and M. Chen, “Analysis and average modeling of critical mode boost PFC converter,” IEEE PEDS 2001, pp. 138-141, 2001.
[7] W. Li and X. He, “A family of isolated interleaved boost and buck converters with winding-cross-coupled inductors,” IEEE Trans. Power Electronics., vol. 23, no. 6, pp. 3164-3173, Nov. 2008.
[8] J. R. Tsai, T. F. Wu, C. Y. Wu, Y. M. Chen, and M. C. Lee, “Interleaving phase shifters for critical-mode boost PFC,” IEEE Trans. Power Electronics., vol. 23, no. 3, pp. 1348-1357, May 2008.
[9] L. Huber, B. T. Irving, and M. M. Jovanovic′, “Open-loop control methods for interleaved DCM/CCM boundary boost PFC converters,” IEEE Trans. Power Electronics., vol. 23, no. 4, pp. 1649-1657, July 2008.
[10] A. Newton, T.C. Green, and D. Andrew, “AC/DC power factor correction using interleaved boost & Cuk converters,” IEE Power Electronics and Variable Speed Drives, Conference Publication, no. 475, pp. 293-298, 18-19 Sep. 2000.
[11] T. Ishii and Y. Mizutani, “Power factor correction using interleaving technique for critical mode switching converters,” IEEE Power Electronics Specialists Conference, PESC 98, vol. 1, pp. 905-910, May 1998.
[12] P. W. Lee, Y. S. Lee, D. K. W. Cheng, and X. C. Liu, “Steady-state analysis of an interleaved boost converter with coupled inductor,” IEEE Trans. Industrial Electronics., vol. 47, no. 4, pp. 787-795, Aug. 2000.
[13] C. S. Babu and M. J. Veerachary, “Predictive controller for interleaved boost converter,” Proc. of IEEE ISIE.2005, pp. 577-581, June 2005.
[14] J. R. Pinheiro, H. A. Gründling, D. L. R. Vidor and J. E. Baggio, “Control strategy of an interleaved boost oower factor correction converter,” IEEE Power Electronics Specialists Conference, PESC 99, vol. 1, pp. 137-142, July 1999.
[15] T. F. Wu, J. C. Hung, J. T. Tsai, C. T. Tsai, and Y. M. Chen, “An active-clamp push–pull converter for battery sourcing applications, IEEE Trans. Industry Applications., vol. 44, no. 1, pp. 196-204, Jan./Feb. 2008.
[16] F. A. B. Coelho, J. C. Oliveira, V. J. Farias, E. A. A. Coelho, L. C. Freitas, and J. B. V. Jr., “A single-stage symmetrical-output-voltage push-pull boost converter with a notch filter for input-current-shaping,” IEEE Applied Power Electronics Conference and Exposition, Twenty-First Annual, 2006, pp. 7, 19-23 March 2006.
[17] P. Xu, M. Ye, and F. C. Lee, “Single magnetic push-pull forward converter featuring built-in input filter and coupled-inductor current doubler for 48 V VRM,” IEEE Applied Power Electronics Conference and Exposition, Seventeenth Annual, 2002, vol. 2, pp. 843-849, 10-14 March 2002.
[18] S. Arulselvi, C.Subashini, and G. Uma, “A new push-pull zero voltage switching quasi-resonant converter: topology, analysis and experimentation,” IEEE Indicon 2005 Conference, pp. 482-486, 11-13 Dec. 2005.
[19] W. Qiu, W. Wu, K. Rustom, H. Mao, and I. Batarseh, “Bi-flyback single-stage PFC converter with valley switching technique,” IEEE Power Electronics Specialist Conference, 34th Annual, 2003, vol. 2, pp. 803-807, 15-19 June 2003.
[20] L. Huber, B. T. Irving, and M. M. Jovanovi′c, “Effect of valley switching and switching-frequency limitation on line-current distortions of DCM/CCM boundary boost PFC converters,” IEEE Trans. Power Electronics., vol. 24, no. 2, pp. 339-347, Feb. 2009.
[21] Texas Instruments, Inc, “UCC28060, natural interleaving™ dual-phase transition-mode PFC controller,” Data Sheet, Slus767A, May 2007.