在綠色能源的提倡下，電動車已成為發展的趨勢，而良好的車載充電器需具備高輸入電壓、電流和高功率密度的要求，本論文研製一種新型寬範圍高壓電動車用之快速充電器架構，其為具有寬電壓增益操作範圍之三階全橋LLC諧振轉換器。模式控制上基於定頻的脈波寬度和振幅調變控制策略，分為高(三階)、中(不對稱振幅)、低(傳統相移)電壓增益三種操作模式，每種操作模式可藉由調整個別的工作責任週期(高、低增益模式)或相移角(中增益模式)來穩定輸出電壓，並將開關操作頻率固定於諧振頻率，使所有開關和二極體均可柔性切換，達到高效率之目的；而寬電壓增益範圍可滿足更高輸入電壓和更寬的負載輸出等操作需求；固定操作頻率則可改善傳統LLC轉換器因頻率操作範圍大使電感、變壓器和濾波器不易設計和輕載效率低之缺點。本研究實作一840 W之三階全橋LLC諧振轉換器雛型，輸入電壓範圍為350 V至450 V，輸出電壓範圍為157 V至420 V。由實驗結果可得知，轉換器可依照輸入電壓及輸出電壓範圍，操作於所提之三種增益模式，並能於電壓變動時進行模式間之轉換。各模式操作下轉換器均可達到ZVS導通及ZCS截止，其最高效率可達93.41%。

With the promotion of green energy, electric vehicles have become a developing trend, and a good on-board charger requires high input voltage, current and high power density. This study realizes a novel converter topology suitable for being used as on-board charger of electric vehicles; it is a three-level full-bridge LLC resonant converter with a wide voltage gain operating range. The mode control is based on the fixed-frequency pulse width and amplitude modulation control strategy, which is divided into three operation modes in voltage gain: high voltage gain mode (three-level), medium voltage gain mode (asymmetric amplitude), and low voltage gain mode (conventional phase shift). Each operation mode can stabilize the output voltage by adjusting the duty cycle (high and low gain mode) or phase shift (medium gain mode). Also, it fixes the switching frequency at the resonance frequency so that all switches and diodes can achieve soft-switching to attain high efficiency. Fixing the operation frequency can improve the shortcomings found in LLC converters: the low light load efficiency and the difficulty in designing magnetic components such as inductors, transformers and filters due to the larger frequency operating range. This research implements a prototype of an 840 W three-level full-bridge LLC resonant converter, with an input voltage range of 350 V to 450 V and an output voltage range of 157 V to 420 V. According to the experimental results, the converter can successfully operate in the three gain modes proposed in accordance with the ratio of input voltage and output voltage. It can switch between modes when the voltage changes. The converter can achieve ZVS turn-on and ZCS turn-off in each mode, and the highest efficiency can reach 93.41% .

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