本論文主要為實現一台具一次側電流優化控制之串聯-串聯諧振式無線電力傳輸轉換器，電路可應用於電動腳踏車電池充電系統。本論文首先簡單介紹不同無線功率傳輸方式的基本原理，歸納其優缺點與特性，並選用磁場耦合式作為無線電力傳輸系統。接著介紹磁共振式無線電力傳輸系統常見的電路拓樸，分析線圈繞製特性，並選用串聯-串聯諧振式電路作為主要架構來研製電路。利用等效模型分析諧振槽參數在不同工作頻率點之下的特性，說明諧振電路常見之控制方式，並因應工作頻率與選用控制法之特性來分析一次側電流值，延伸一次側電流優化控制之功能，用以改善電路操作於輕載時之效率。同時還介紹電池負載充電特性，設計控制韌體來完成定電壓、定電流充電模式，最後實作出一台200 W且具一次側電流優化控制之串聯-串聯諧振式無線電力傳輸系統，兩線圈間隔距離為20 毫米，滿載時效率可達90%，且輕載時效率確實可達到優化效果。

This thesis focuses on realizing a series-series resonant wireless power transmission converter with primary current optimal control, and the circuit development is applied to electric bicycle battery charger. First, this thesis introduces the basic principles of different wireless power transmission methods, summarizes their characteristics, and selects the magnetic field coupling type as the wireless power transmission system, then introduces the common topology of the magnetic resonance wireless power transmission system, analyzes the characteristics of different coil winding methods, Lastly, select series-series topology as the main structure to develop the resonant circuit.
Analyze the performance of the resonant tank parameters under different operating frequency points by the equivalent model, and introduce the common control methods, then derive the primary current value and develop the current optimal function to improve the efficiency at light loads.
Introduce the battery load charging characteristics, design the control firmware to achieve the constant voltage and constant current charging mode, lastly, we made a 200-watt series-series resonant wireless power transmission system with optimized primary current control. The distance between the two coils is 20 mm, the efficiency can reach 90% at full load, and it optimizes the efficiency at light load.

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