本論文係以橋式整流型推挽式電力轉換器為基礎，結合ZVS-PWM柔性切換技術，設計出新型的零電壓切換推挽式DC/DC電力轉換器(push-pull ZVS-PWM DC/DC converter)，本文所提出之電力轉換器具有高電能轉換效率與定頻控制的優點。

　　橋式整流型推挽式電力轉換器，當兩個主開關皆為off時，開關寄生電容與變壓器漏電感會產生共振，但因共振頻率很高，若要達零電壓切換(ZVS)，則轉換器需作高頻切換與變頻控制。為改善此缺點，可額外增加共振元值，以降低共振頻率，但仍然無法改善變頻控制的缺點。

　　本論文所提出的新型推挽式轉換器，係於橋式整流型推挽式電力轉換器中加入兩個輔助開關，控制共振發生的時間，達到定頻控制之目的。此外，兩個開關均可達到零電壓切換，可有效地提升轉換器之效率。

　　針對本論文所提出之零電壓切換推挽式電力轉換器，吾人進行動作原理分析，並利用IsSpice模擬與電路實作以驗證其理論推導之正確性。論文中係以平均化法，推導轉換器之小信號數學模式，以研究其動態行為，並量測電力轉換器實作之轉移函數，以驗證數學模式之正確性。相較於傳統推挽式電力轉換器，零電壓切換推挽式電力轉換器其阻尼比大於1，具有較好的動態響應。為了達到輸出穩壓的目的，吾人依據數學模式，設計古典控制器。經由模擬與實作結果相互比較可知，吾人所設計之控制器，在負載變化或線電壓變動下均有良好的穩壓效果。

　　In this thesis, based on the bridge-type push-pull converter, the ZVS-PWM technology is applied to design a novel push-pull ZVS-PWM DC/DC converter. This proposed converter possesses the properties of high efficiency and constant-frequency operation.

　　In the bridge-type push-pull converter, the resonance between the MOSFET junction capacitance and transformer leakage inductance occurs when both switches turn off. In order to achieve ZVS, the converter is variable frequency operation and exhibits high-frequency switching. To overcome the drawback, the external inductor and capacitor can be added to decrease the resonant frequency, but the converter is still variable frequency operation.

　　In this thesis, a novel push-pull converter is proposed. Two auxiliary switch is added to bridge-type push-pull converter to create ZVS condition for both main switches. It is a fixed frequency operation and the efficiency of the converter is improved.

　　The detailed circuit analysis for the proposed push-pull ZVS-PWM converter is presented in this thesis. The theoretical analysis is verified by experiments and simulations of IsSpice. The averaging method is used to derive the small-signal model of the converter. Based on this model, the system dynamic behaviors can be investigated. It is interesting to note that the damping ratio of the push-pull ZVS-PWM converter is greater than one, so that the dynamic response of the push-pull ZVS-PWM converter is better than that of the conventional push-pull converter. According to the small-signal mathematical model, a classical controller is designed to achieve output voltage regulation. The simulation responses and experimental results show that the controller has a good regulation capacity under the variations of load and line voltage.

[AbB00] Abu-Qahouq, J. and I. Batarseh, “Generalized Analysis of Soft-Switching DC-DC Converters,” IEEE PESC, pp. 185-192, 2000.

[BBML90] Barbi, I., J. C. O. Bolacell, D. C. Martin and F. B. Libano, “Buck Quasi-Resonant Converter Operating at Constant Frequency: Analysis, Design and Experimentation,” IEEE Trans. on Power Electronics, pp. 276-283, 1990.

[BoB02] Bodur, H. and A. F. Bakan, “A New ZVT-PWM DC-DC Converter,” IEEE Trans. on Power Electronics, pp. 40-47, 2002.

[BoM02] Boonyaroonate, I. and S. Mori, “A New ZVCS Resonant Push-Pull DC-DC Converter Topology,” IEEE APEC, Vol. 2, pp. 1097-1100, 2002.

[ChL97] Chen, Y. T. and W. H. Liu, “The Implementation and Analysis for The ZVS PWM Forward Converter Using a Saturable Circuit,” Proceedings of the 18th Symposium on Electrical Power Engineering, R.O.C., pp. 328-333, 1997.

[Eri99] Erickson, R. W., Fundamentals of Power Electronics, Kluwer Academic Publishers, Massachusetts, 1999.

[FJL93] Farrington, R., M. M. Jovanovic and F. C. Lee, “A New Family of Isolated Converters that Uses the Magnetizing Inductance of the Transformer to Achieve Zero-Voltage Switching,” IEEE Trans. on Power Electronics, Vol. 8, No. 4, pp. 535-545, 1993.

[GhM02] Ghodke, D. V. and K. Muralikrishnan, “1.5 kW Two Switch Forward ZCZVS Converter Using Primary Side Clamping,” IEEE PESC, pp. 893-898, 2002.

[HeS98] Hey, H. L. and C. M. O. Stein, “A New Family of Soft-Switching DC-DC PWM Converters Using a True ZCZVT Commutation Cell,” IEEE IECON, pp. 1030-1035, 1998.

[HLL92] Hua, G., C. S. Leu and F. C. Lee, “Novel Zero-Voltage-Transition PWM Converters,” VPEC Seminar, pp. 81-88, 1992.

[HLWL] Hsieh, G. C., M. F. Lai, J. P. Wang and M. H. Lia, “Realization Study of Isolated Half-Bridge Zero-Voltage-Switched Converter,” IEEE IECON, pp. 663-668, 1994.

[HuL95] Hua, G. and F. C. Lee, “Soft-Switching Techniques in PWM Converters,” IEEE Trans. on Industrial Electronics, Vol. 42, No. 6, pp. 595-603, 1995.

[JJJ01] Jain, N., P. Jain and G. Joos, “Analysis of a Zero Voltage Transition Boost Converter Using a Soft Switching Auxiliary Circuit with Reduced Conduction Losses,” IEEE PESC, pp. 1799-1804, 2001.

[JoY00] Jovanovic, M. M. and J. Yungtaek, “A Novel Active Snubber for High-Power Boost Converters,” IEEE Trans. on Power Electronics, Vol. 15, pp. 278-284, 2000.

[JTL89] Jovanovic, M. M., W. A. Tabisz and F. C. Lee. “High-Frequency Off-Line Power Conversion Using Zero-Voltage-Switching Quasi-Resonant and Multiresonant Techniques,” IEEE Trans. on Power Electronics, Vol. 4, No. 4, pp. 459-469, 1989.

[LiC03] Lin, J. L. and C. H. Chang, “Small signal modeling and control of ZVT-PWM Boost converters,” IEEE Trans. on Power Electronics, Vol.18, Issue 1, Part 1, pp. 2-10, 2003

[LiH00] Lin, J. L. and H. Y. Hsieh, “Dynamics Analysis and Controller Synthesis for Zero-Voltage-Transition PWM Power Converters,” IEEE Trans. on Power Electronics, Vol. 15, No. 2, pp. 205-214, 2000.

[LiL90] Lin, K. H. and F. C. Lee, “Zero-Voltage Switching Technique in DC/DC Converters,” IEEE Trans. on Power Electronics, Vol. 5, pp. 293-304, 1990.

[LLH01] Lee, M. K., D. Y. Lee and D. S. Hyun, “New Zero-Current-Transition PWM DC/DC Converters without Current Stress,” IEEE PESC, pp. 1069-1074, 2001.

[LOL87] Liu, K. H., R. Oruganti and F. C. Lee, “Quasi-Resonant Converter: Topologies and Characteristics,” IEEE Trans. on Power Electronics, Vol. 2, No. 1, pp. 26-71, 1987.

[MaC91] Maksimoric, P. and S. Cuk, “Constant Frequency Control of Quasi-Resonant-Converter,” IEEE Trans. on Power Electronics, Vol. 6, No. 1, pp. 141-150, 1991.

[MADB03] Mao, H., J. A. Abu-Qahouq, S. Deng and I. Batarseh, “A New Duty-Cycle-Shifted PWM Control Scheme for Half-Bridge DC-DC Converters to Achieve Zero-Voltage-Switching,” IEEE APEC, pp. 629-634, 2003.

[MaL97] Mao, H. and F. C. Lee, “Improved Zero-Current Transition Converters for High-Power Applications,” IEEE Trans. on Industry Applications, Vol. 33, No. 5, pp. 1220-1231, 1997.

[NTW95] Ned, M., M. U. Tore and P. R. William, Power Electronics, 2nd Ed., John Wiley, 1995.

[RBD98] Ryan, M. J., W. E. Brumsickle and D. M. Divan, ”A New ZVS LCL-Resonant Push–Pull DC–DC Converter Topology,” IEEE Trans. on Industry Applications, Vol. 34, No. 5, pp. 1164-1174, 1998.

[RLYH00] Ryu, S. H., D. T. Lee, S. B. Yoo and D. S. Hyun, “A Modified ZVZCS Commutation Cell for All Active Switches in PWM Converters,” IEEE PESC, pp. 760-765, 2000.

[SCGU95] Sebastian, J., J. A. Cobos, O. Garcia and J. Uceda, “An Overall Study of the Half-Bridge Complementary-Control DC-to-DC Converter,” IEEE PESC, pp. 1229-1235, 1995.

[ShH91] Shoyama, M. and K. Harada, ”Zero-Voltage-Switched Push-Pull DC-DC Ponverter,” IEEE PESC, pp. 223-229, 1991.

[StH00] Stein, C. M. O. and H. L. Hey, “A True ZCZVT Commutation Cell for PWM Converters,” IEEE Trans. on Power Electronics, Vol. 15, No. 1, pp. 185-193, 2000.

[SuG92] Sun, J. and H. Grotstollen, “Averaged Modeling of Switching Power Converters: Reformulation and Theoretical Basis,” IEEE PESC, pp. 1162-1172, 1992.

[SuG93] Sun, J. and H. Grotstollen, “Averaged Modeling and Analysis of Resonant Converters,” IEEE PESC, pp. 707-713, 1993.

[TaL88] Tabisz, W. A. and F. C. Lee, “Zero-Voltage-Switching Multi-Resonant Technique: A Novel Approach to Improve Performance of High-Frequency Quasi-Resonant Converters,” IEEE PESC, pp. 9-17, 1988.

[WBC99] Wakabayashi, F. T., M. J. Bonato and C. A. Canesin, “A New Family of Zero-Current-Switching PWM Converter,” IEEE PESC, Vol. 1, pp. 451-456, 1999.

[WeI95] Wei, H. and A. Ioinovici, “DC-DC Zero-Voltage-Transition Converter with PWM Control and Low Stress on Switches,” IEEE APEC, pp. 523-529, 1995.

[YaL93] Yang, L. and C. Q. Lee, “Analysis and Design of Boost Zero-Voltage-Transition PWM Converter,” IEEE APEC, pp. 707-713, 1993.

[YRY02] Yundong, M., X. Ruan and Y. Yan, ”Zero-Voltage and Zero-Current-Switching PWM Push-Pull Three-Level Converters,” IEEE PESC, Vol. 4, pp. 1823-1828, 2002.

[劉君上96] 劉君上，共振式DC-DC電源轉換器之分析與強健控制器之設計，碩士論文，國立成功大學工程科學系，1996。

[邱士峰97] 邱士峰，半共振式零電流切換型暨PWM電流回授型之DC-DC電源轉換器：製作分析及控制器之設計，碩士論文，國立成功大學工程科學系，1997。

[謝欣穎98] 謝欣穎，零電壓轉移柔性切換電源轉換器之動態模式分析及控制器之研製，碩士論文，國立成功大學工程科學系，1998。

[張景華99] 張景華，升壓型零電壓轉移柔切式電力轉換器之模式分析及控制器設計，碩士論文，國立成功大學工程科學系，1999。

[游志雄00] 游志雄，零電壓轉移高功率因數電力轉換器之模式分析及控制器設計，碩士論文，國立成功大學工程科學系，2000。

[夏存孝01] 夏存孝，零電流零電壓轉移柔切式升壓型電力轉換器之模式分析及控制器設計，碩士論文，國立成功大學工程科學系，2001。

[劉育伶02] 劉育伶，非浮接開關之零電流零電壓轉移柔切式升壓型電力轉換器之分析研製及控制器設計，碩士論文，國立成功大學工程科學系，2002。

[葉怡君03] 葉怡君，新型零電流零電壓轉移柔切式高功因AC/DC整流器，碩士論文，國立成功大學工程科學系，2003。

[賴建志04] 賴建志，具有同歩整流技術之零電流零電壓柔切轉移順向式DC/DC電力轉換器之研製，國立成功大學工程科學系，2004。

[唐碩甫04] 唐碩甫，零電壓柔性切換半橋式DC/DC電力轉換器之分析研製及控制器設計，國立成功大學工程科學系，2004。