傳統LLC諧振轉換器多為前端具PFC之交流-直流轉換器串接LLC直流-直流轉換器,本論文是使用單只數位訊號處理器實現具前端PFC之LLC諧振轉換器。經由一只數位訊號處理器產生固定50%責任週期之互補驅動信號,推動LLC諧振轉換器前端半橋電路之功率晶體(金氧半場效電晶體),使變壓器初級側激磁電感、漏電感與諧振電容產生諧振,並以動態升壓之方式調變頻率提供負載變動需求。 為建立完整分析與設計環境,本論文以IsSpice建構模擬環境,以進行電路特性分析與設計。最後以一只數位訊號處理器TMS320F28035作為控制核心,建構輸入電壓為AC 110V/220V,輸出為12V/25A之具PFC雙級LLC諧振轉換器,以驗證所研製轉換器之有效性與設計規格相符。
Conventional LLC resonant converter has always been a PFC front-end AC-DC converter and an LLC DC-DC converter connected in series. This thesis implements an LLC resonant converter with PFC front-end using single digital signal processor (DSP). Complementary drive signals of the fixed 50% duty are generated by a DSP to drive the power transistor (MOSFET) on half-bridge circuit of LLC resonant converter. Hence, this will let the transformer’s primary side magnetizing inductance, leakage inductance, and resonant capacitor resonate and dynamically adjust the frequency modulation mode, then provide load demand changes. In order to establish a complete analysis and design environment, this thesis uses IsSpice to construct simulation environment for circuit characteristics analysis and design. Finally, a DSP TMS320F28035 is used as the main control to construct a two-stage LLC resonant converter which includes PFC front-end, AC 110V / 220V input voltage, and DC 12V / 25A output voltage, to verify the effectiveness of the converter with the design specifications.