本論文主要研製「可調光發光二極體半橋LLC諧振驅動電路」，此電路前級採用昇壓型功率因數修正電路，後級採用半橋諧振電路。功率因數修正電路採用連續電流模式並使用平均電流控制法來實現。半橋LLC諧振電路使功率開關具有零電壓切換及輸出二極體具有零電流切換以降低切換損失與頻率變化小。本論文首先探討半橋LLC諧振電路之工作原理、電壓增益分析及脈波寬度調變調光。最後實作150 W具調光發光二極體半橋LLC諧振驅動電路，輸入電壓為AC 90~264 Vrms，功率因數皆達0.98以上，效率最高達90.8%。

In this thesis, the design and implementation of a dimmable LED driver with half-bridge LLC resonant converter is presented. The front-stage of the proposed topology is a boost power factor correction circuit and the rear-stage is a half-bridge LLC resonant circuit. To make the PFC circuit operated in continuous conduction mode, a average current controller is used. The half-bridge LLC resonant converter enables the MOSFETs to operate at zero voltage switching and output diode to achieve zero current switching. The voltage gain and operating principle of the half-bridge LLC resonant are presented. In addition, the pulse width modulation dimming function is discussed. Finally, a half-bridge LLC resonant LED driver is implemented with input voltage 90~264 Vrms, 150 W LED module in the laboratory. Experimental results show that the power factor is over 0.98 and the maximum efficiency is up to 90.8%.

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