本論文旨在研製高效率、高功率因數LED驅動器，選用無橋式功率因數修正器為前級電路架構，藉以降低導通損耗提高轉換效率；另外藉由操作在邊界導通模式，使得開關能近似於零電壓切換，且二極體也能達到零電流截止，有效降低切換損失。後級直流-直流轉換器分別採用半橋串聯諧振橋式整流轉換器與半橋串聯諧振三倍壓整流轉換器，因其具有零電壓切換之優點，故能減少一次側之切換損失。最後實際製作兩部交流輸入90 V~260 V/60 Hz、直流輸出215 V、150.5 W，具有定電壓控制、定電流控制的LED驅動器，並驗證不同後級直流-直流架構皆能達到高效率、高功因的目的。

This thesis focuses on the study and implementation of high-efficiency, high-power factor (PF) LED drivers. The front-end rectifier is a bridgeless power factor corrector (PFC) to reduce the conduction losses and improve the efficiency. By operating under boundary conduction mode, near zero-voltage switchings for the active switches and zero-current switchings for the diodes are achieved, which can further reduce the switching losses. For the post-stage DC-DC converter, half-bridge series resonant converters with bridge rectifier and voltage tripler rectifier, respectively, are adopted. The switching losses at primary side can be reduced by zero-voltage-switching feature. Two LED drivers with an input voltage of 90 to 260 Vrms/60 Hz, a DC output voltage of 215 V, and an output power of 150.5 W are implemented and tested. Constant voltage control and constant current control are also fulfilled. Both the presented DC-DC topologies are verified to achieve high efficiency and high PF.

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