非接觸式充電因其便利性、安全性及可靠度，成為取代傳統有線式充電器之潛力技術，但轉換效率仍為尚待解決之問題。本論文實現一非接觸充電系統，此系統傳送器及接收器兩大部份構成。傳送器以功率電晶體、閘極驅動器等離散元件完成原型，接收器充電電路部份則以積體電路設計實現。本論文針對接收器充電電路提出兩種設計，藉以改善非接觸式充電系統效率。首先，一般鋰電池充電過程包含定電流及定電壓模式，本論文提出之可重組態架構在定電流模式採用切換式架構以得到高轉換效率；進入定電壓模式後，輸入與輸出電壓差變小，充電電流降低，此時將充電電路切換至線性式架構，去除切換式架構在輕載時因高頻操作帶來的大量切換損耗，改善定電壓模式轉換效率，線性式架構同時可避免輸出電壓漣波造成判斷誤差，增加充電準確度。此外，在定電流模式充電階段，本論文設計多段電流充電方式，隨電池電壓上升逐步降低充電電流，同時改善定電流充電時之轉換效率。
　　本論文使用TSMC 0.35um 2P4M 3.3V/5V混合訊號互補式金氧半導體製程製作。晶片面積為0.996 x 1.272 mm2，充電電路設計規格輸入電壓為5V±10%、輸出電壓範圍為1.2V至4.5V、操作頻率為150kHz至2.3MHz，輕載效率改善達13.97%。此外，以Panasonic 18650CSR鋰電池進行實際量測結果顯示，電池電壓從2.5V至4.2V皆可正常運作，最高轉換效率為85.7%。

　　Contactless charging is emerging as a potential technology to replace conventional wired charger because of its convenience, safety, and reliability. However, the conversion efficiency is still a problem to be solved. A contactless charger system composed of transmitter and receiver is implemented in this thesis. The prototype of transmitter is realized by power MOSFETs and gate driver. The receiver is implemented by integrated circuit design. Generally, charging procedure of battery consists of trickle-current (TC), constant-current (CC), and constant-voltage (CV) modes. The proposed reconfigurable charger circuit uses switching-mode charger in CC mode to achieve high conversion efficiency. While charging mode enters CV mode, the proposed reconfigurable charger adopts low-dropout linear (LDO) charger to reduce high switching power loss at light load. So the light-load conversion efficiency is also improved. In addition, the proposed multi-step charging current in CC mode is also step down charging current as battery voltage rising, which makes the conversion efficiency in CC mode improved.
　　The proposed reconfigurable charger circuit is fabricated with TSMC 0.35um 2P4M 3.3/5V Mixed-Signal CMOS process. The total chip area is 0.996 x 1.272 mm2. Verification results show that the maximum conversion efficiency is 85.7%.

[1]. Peng Cong, Chaimanonart, N.; Ko, W.H., and Young, D.J., “A Wireless and Batteryless 10-Bit Implantable Blood Pressure Sensing Microsystem With Adaptive RF Powering for Real-Time Laboratory Mice Monitoring”, IEEE J. Solid-State Circuits, Volume 44, Issue 12, pp. 3631-3644, Dec. 2009.

[2]. Pengfei Li and Bashirullah, R., “A Wireless Power Interface for Rechargeable Battery Operated Medical Implants”, IEEE Trans. Circuits and Systems II: Express Briefs, Volume 54, Issue 10, pp.912-916, Oct. 2007.

[3]. Ghovanloo, M. and Najafi, K., “A wideband frequency-shift keying wireless link for inductively powered biomedical implants”, IEEE Trans. Circuits and Systems I: Regular Papers, Volume 51, Issue 12, pp. 2374-2383, Oct. 2004.

[4]. Cannon, B.L., Hoburg, J.F., Stancil, D.D., and Goldstein, S.C., “Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple Small Receivers”, IEEE Trans, Power Electronics, Volume 24, Issue 7, pp. 1819-1825, July, 2009.

[5]. Yoo, J., Long Yan, Seulki Lee, Yongsang Kim, and Hoi-Jun Yoo, “A 5.2 mW Self-Configured Wearable Body Sensor Network Controller and a 12 μW Wirelessly Powered Sensor for a Continuous Health Monitoring System”, IEEE J. Solid-State Circuits, Volume 45, Issue 1, pp. 178-188, Jan. 2010.

[6]. Liang-Rui Chen, Hsu, R.C., and Chuan-Sheng Liu, “A Design of a Grey-Predicted Li-Ion Battery Charge System”, IEEE Trans. Industrial Electronics, Volume 55, Issue 10, pp. 3692 - 3701, Oct. 2008.

[7]. Chia-Hsiang Lin, Chun-Yu Hsieh, and Ke-Horng Chen, “A Li-Ion Battery Charger With Smooth Control Circuit and Built-In Resistance Compensator for Achieving Stable and Fast Charging”, IEEE Trans. Circuits and Systems I: Regular Papers, Volume 57, Issue 2, pp. 506-517, Feb. 2010.

[8]. Rosario Pagano, Michael Baker, and Russell E. Radke, “A 0.18- μm Monolithic Li-Ion Battery Charger for Wireless Devices Based on Partial Current Sensing and Adaptive Reference Voltage”, IEEE J. Solid-State Circuits, Volume 46, No 6, pp. 1355-1368, June 2012.

[9]. Baker, M. and Radke, R.E., “A 0.18-μm Monolithic Li-Ion Battery Charger for Wireless Devices Based on Partial Current Sensing and Adaptive Reference Voltage”, IEEE JSSC, Vol 47, No. 6, pp. 1355-1368, June. 2012.

[10]. Aristeidis Karalis, J.D. Joannopoulos, and Marin Soljačić, “Efficient wireless non-radiative mid-range energy transfer”, Annals of Physics, Vol. 323, Issue 1, pp 34 - 48, April 27, 2007.

[11]. Kim, J. and Cho, B. H., “Pattern Recognition for Temperature-Dependent Electrochemical Characteristics of a Li-Ion Cell”, IEEE Trans. Energy Conversion, Volume PP, Issue 99, pp. 1-8, 2012.

[12]. V. Agarwal, K. Uthaichana, R. A. Decarlo, and L. H. Tsoukalas, “Development and validation of a battery model useful for discharging and charging power control and lifetime estimation”, IEEE Trans. Energy. Conversion, vol. 25, no. 3, pp. 821-835, Sep. 2010.

[13]. Ramamurthy, A., “Advanced lithium ion battery modeling and power stage integration technique”, IEEE Energy Conversion Congress and Exposition, pp. 1485-1492, Sept. 2010.

[14]. Min Chen and Rincon-Mora, G.A., “Accurate electrical battery model capable of predicting runtime and I-V performance”, IEEE Trans. Energy Conversion, Volume 21, Issue 2, pp. 504-511, June 2006.

[15]. S. Abu-Sharkh and D. Doerffel, “Rapid test and non-linear model characterization of solid-state lithium-ion batteries,” Journal of Power Sources, Vol. 130, pp. 266–274, 2004.

[16]. Juan L. Villa, Jesús Sallán, José Francisco Sanz Osorio, and Andrés Llombart, “High-Misalignment Tolerant Compensation Topology For ICPT Systems”, Trans. Industrial Electronics, Vol. 59, No. 2, Feb. 2012.

[17]. Xunwei Zhou, Wang, T.G., and Lee, F.C., “Optimizing design for low voltage DC-DC converters”, Applied Power Electronics Conference and Exposition, Twelfth Annual, vol. 2, pp. 612-616, Feb. 1997.

[18]. N. Mohan, T. M. Undeland, and W. P. Robbins, “Power Elelctronics - Converters, Applications, and Design 3rd edition”, JOHN WILEY & SONNS, INC.

[19]. Tang, W.; Lee, F.C.; Ridley, R.B., “Small-signal modeling of average current-mode control”, Applied Power Electronics Conference and Exposition, Seventh Annual, pp. 747-755, 1992.

[20]. Cooke, P., “Modeling average current mode control”, Applied Power Electronics Conference and Exposition, vol. 1, pp.256-262, 2000.

[21] Sun, J.; Bass, R.M., “Modeling and practical design issues for average current control”, APEC, vol. 2, pp.980-986, 1999.

[22]. Alan Hastings, Roy Alan Hastings, “The Art of Analog Layout”, Prentice Hall, 2000-12-15.

[23]. Yuh-Shyan Hwang, Shu-Chen Wang, Fong-Cheng Yang, and Jiann-Jong Chen, “New Compact CMOS Li-Ion Battery Charger Using Charge-Pump Technique for Portable Applications,” IEEE Trans. Circuits Syst. I, Reg. Papers, vol. 54, no. 4, pp. 705-712, April 2007.

[24]. Min Chen and Gabriel A. Rincón-Mora, “Accurate, Compact, and Power-Efficient Li-Ion Battery Charger Circuit,” IEEE Trans. Circuits Syst. II, Exp. Briefs, vol. 53, no. 11, pp. 1180-1184, Nov. 2006.

[25]. Rosario Pagano, Michael Baker, and Russell E. Radke, “A 0.18-μm Monolithic Li-Ion Battery Charger for Wireless Devices Based on Partial Current Sensing and Adaptive Reference Voltage,” IEEE J. Solid-State Circuits, vol. 47, no. 6, pp. 1355–1368, June 2012.