本論文將無線能量傳輸系統應用至電動腳踏車，最終希望能實現一高效率、高功率密的無線電動腳踏車充電器。為了達成高功率密度的目標，此架構將採用較高的切換頻率6.78 MHz，雖然高的切換頻率能達到高功率密度及線圈的小型化，但也會造成功率元件的切換損失急遽的增加，因此功率元件的選用也顯得更加重要，本論文則是採用了寬能隙元件氮化鎵做為一次側全橋串聯諧振式電路架構之切換開關而二次側則是採用順向偏壓小且反向快速回復特性的蕭特基二極體作為整流器。此外為了增加線圈之間的耦合以及減少漏磁對周遭環境的影響，接收端與發送端線圈將搭配使用高頻磁性材料來達到此目的。在論文會透過限元素分析軟體Maxwell來模擬驗證電路架構、線圈設計及磁性材料設計的可行性，由於本論文是操作於固定增益點，同時也會分析在此區間遇到相位差所造成的問題，導致開關失去零電壓導通的特性，以及後續加入額外的輔助零切電路，來改善此現象。在模擬結果達到原先設計要求後，再將理論與實務結合，實現出達到計畫要求的電路成品。最終達成輸入電壓110 V、輸出電壓110 V、瓦數240 W、切換頻率6.78 MHz且最高效率為92.45 %的無線電動腳踏車充電器。

This thesis focuses on the wireless charging application of E-bike, and hopes to achieve a high efficiency, high power density wireless charger for E-bike. In order to achieve high power density, this system will use high switching frequency around 6.78 MHz. Although the high switching frequency can achieve high power density and the miniaturization of the coil, it will also cause a large of switching loss of power switches. To solve this problem, the selection of power components is more important. In this thesis, the wide band gap devices, GaN, is used as the switch of the primary side full bridge series resonant circuit, and the secondary side bridge rectifier citcuit uses the Schottky diode, it has smaller forward voltage and faster reverse recovery time. In order to increase the coupling between the coils and decrease the influences of magnetic field to surroundings, the coils will use high frequency magnetic materials to achieve this purpose. In this thesis, the analysis software Maxwell will be used to simulate the design of circuit, coil and core. Since the circuit of this thesis is operating at constant gain, it also analyzes the phase problems, causing the switches lose zero voltage switching. By adding the auxiliary circuit to improve this problem. After the simulation results meet the design requirements, the theory and practice are combined to finish the circuit. Finally, a wireless charger for E-bike with input voltage 110V, output voltage 110 V, output power 240 W, switching frequency 6.78 MHz and a maximum efficiency 92.45 % is achieved.

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