本論文旨在利用壓電變壓器並聯操作，以達到輸出功率疊加之目的，用來解決單片操作應用場合功率不足的問題。依據壓電片的特性差異來決定採用的並聯策略，兩種並聯架構被導入使用，直接並聯架構適用於特性相近的壓電變壓器使用，而間接並聯架構，排除壓電變壓器諧振頻率的因素，可用於特性差異較大的場合。在控制器的建構上，這裡提出一套脈波寬度與脈波頻率交互調變的控制方法，其可以有效的因應較大線電壓與負載的變動，同時為了決定控制器調整範圍，可控區間的設計流程亦被提出，用以求出操作頻率區間與負載範圍，最後再利用微控制器PIC16F73，完成直接並聯系統與間接並聯系統的建構，在單獨操作具有22.5W輸出的壓電片上，透過兩種並聯架構的設計，均可達到45W左右的疊加功率輸出。

　　This thesis presents the paralleling techniques of piezoelectric transformers that want to improve power capability for solving insufficient power output where the single piezoelectric transformer operates. Two kinds of parallel architectures are adopted here. The direct paralleling architecture is suitable for those piezoelectric transformers with small characteristic deviation. The indirect paralleling architecture that is not affected by resonant frequency can allow some characteristic variation on piezoelectric transformers. The pulse width modulation and pulse frequency modulation alternate control that have good voltage regulation for both line and load variation is proposed. To find an adjustable range, a designing procedure with controllable zone is also presented so that the operational frequency and loading range can be decided. Finally, both paralleling architectures are implemented by microcontroller, PIC16F73. Each piezoelectric transformer can provide about 22.5W and the total power is almost 45W.

[1] C. A. Rosen, “Ceramic transformers and filters,” in Proc. Electron. Comp. Symp., 1956, pp. 205-211.

[2] S. Hamamura, T. Zaitsu, T. Ninomiya, and M. Shoyama, “Noise characteristics of piezoelectric-transformer DC-DC converter,”in Proc. IEEE Power Electronics Specialists Conf., May 1998, pp. 1262-1267.

[3] T. Zaitsu, O. Ohnishi, T. Inoue, M. Syoyama, and T. Ninomiya, “2MHz power converter with piezoelectric transformer,” in Proc. IEEE INTELEC’92 Conf., 1992, pp. 430-437.

[4] O. Ohnishi, Y. Sasaki, T. Zaitsu, H. Kishie, and T. Inoue, “Piezoelectric ceramic transformer for power supply operating in thickness extensional vibration mode,” IEICE Trans. Fundamentals, vol. E77-A, No. 12, pp. 2098-2105, 1997.

[5] T. Zaitsu, Y. Fuda, Y. Okabe, T. Ninomiya, S. Hamamura, and M. Katsuno, “New piezoelectric transformer converter for AC-adapter,” in Proc. IEEE Appl. Power Electron. Conf., 1997, pp. 568-572.

[6] C. Y. Lin, “Design and analysis of piezoelectric transformer converters,” Ph. D Dissertation, Virginia Polytechnic Institute and State University, USA, 1997.

[7] S. Hamamura, T. Zaitsu, T. Ninomiya, M. Shoyama, and Y. Fuda “AC-DC converter using piezoelectric transformer,” IEICE Trans. Commun., vol. J82-B, no. 7, pp. 1838-1846, 1997.

[8] G. Ivensky, S. Bronstein, and S. Ben-Yaakov, “Analysis and design of a piezoelectric transformer AC/DC converter in a low voltage application,” in Proc. IEEE Power Electronics Specialists Conf., 2002, pp. 409-419.

[9] M. Shoyama, K. Horikoshi, T. Ninomiya, T. Zaitsu, and Y. Sasaki, “Operation analysis of the push-pull piezoelectric inverter,” in Proc. IEEE Power Electronics Specialists Conf., 1997, pp. 573-578.

[10] M. Shoyama, K. Horikoshi, T. Ninomiya, T. Zaitsu, and Y. Sasaki, “Steady-state characteristics of the push-pull piezoelectric inverter,” in Proc. IEEE Power Electronics Specialists Conf., 1997, pp. 715-720.

[11] C. D. Wey, T. L. Jong, and C. T. Pan, “Design and analysis of an SLPT-based CCFL driver,” IEEE Trans. Ind. Electron., vol. 50, pp. 208-217, 2003.

[12] R. L. Lin, “Piezoelectric transformer characterization and application of electronic ballast,” Ph. D Dissertation, Virginia Polytechnic Institute and State University, USA, 2001.

[13] E. M. Baker, W. Huang, D. Y. Chen, and F. C. Lee “Radial mode piezoelectric transformer design for fluorescent lamp ballast applications,” in Proc. CPES Power Electronics Seminar, 2001, pp. 104-112.

[14] T. Zaitsu, T. Shigehisa, M. Shoyama, and T. Ninomiya, “Piezoelectric transformer converter with PWM control,” in Proc. IEEE Appl. Power Electron. Conf., 1996, pp. 279-283.

[15] T. Zaitsu, T. Shigehisa, T. Inoue, M. Shoyama, and T. Ninomiya, “Piezoelectric transformer converter with frequency control,” in Proc. IEEE INTELEC’95 Conf., 1995, pp. 175-180.

[16] S. Hamamura, D. Kurose, T. Ninomiya, and M. Yamamoto, “Piezoelectric transformer AC-DC converter over a worldwide range of input voltage by combined PWM and PFM control,” in Proc. IEEE Power Electronics Specialists Conf., 2001, pp. 416-421.

[17] T. Zaitsu, “Converter wherein a piezoelectric transformer input signal is frequency modulated by a pulse width modulated signal,” US Patent NO. 5,739,662, 1996.

[18] S. Hamamura, T. Ninomiya, M. Yamamoto, and M. Katsuno, “Combined PWM and PFM control for universal line voltage of a piezoelectric transformer off-line converter,” IEEE Trans. Power Electron., vol. 18, pp. 270-277, 2003.

[19] J. A. Martin-Ramos, M. A. J. Prieto, F.N. Garcia, J. D. Gonzalez, and F. M. F. Linera, “A new full-protected control mode to drive piezoelectric transformers in DC-DC converters,” IEEE Trans. Power Electron., vol. 17, pp. 1096-1103, 2002.

[20] M. Kazimerczuk and D. Czarkowski, “Resonant Power Converters”, John Wiley & Sons, New York, 1995.

[21] J. W. Kim, H. S. Choi, and B. H. Cho, “A novel droop method for converter parallel operation” IEEE Trans. Power Electron., vol. 17, NO. 1, JANUARY , 2002.

[22] S. Luo, Z. Ye, R. L. Lin, and F. C. Lee, “A classification and evaluation of paralleling methods for power supply modules,” in Proc. 30 th Annu. IEEE Power Electron. Spec. Conf., 1999, pp. 901-908.

[23] B. T. Irving and M. M. Jovanovic, “Analysis, design, and performance
evaluation of droop current-sharing method,” in Proc. 15 th Annu. IEEE Appl. Power Electron. Conf., 2000, pp.235-241.

[24] PIC16C7XX Data Sheet, Microchip Technology Inc.,1997.

[25] 林容易，PIC單晶片進階控制應用(下)，全華科技圖書，1997。

[26] 謝勝治，Labview應用篇含自動量測、遠端監控，全華科技圖書，2000。

[27] 鄭郡星，“電腦輔助電子電路設計”，全華科技圖書，2001。

[28] 林文炫，“壓電變壓器並聯提昇功率之研究”，國立成功大學電機工程學系碩士論文，2000。

[29] 葉鴻騰，“並聯壓電變壓器應用於螢光燈電子安定器之研究”，國立成功大學電機工程學系碩士論文，2001。

[30] 邱良祥，“環型壓電變壓器應用於直流電源轉換器之研究”，國立成功大學電機工程學系碩士論文，2002。

[31] 黃威旗，“圓型疊層式壓電變壓器應用於電源轉換器之研究”，國立成功大學電機工 程學系碩士論文，2003。