- 學位論文
應用交錯式SEPIC電路之高功因寬輸出範圍交流/直流轉換器
A High-Power-Factor Wide-Output-Range AC-to-DC Conversion Circuit Based on Interleaved Single-Ended Primary Inductance Converters
摘要
本文提出應用交錯式SEPIC電路之高功因寬輸出範圍交流/直流轉換器。該電路架構主要由兩個改良的單端初級電感轉換器(Single-Ended Primary Inductance Converter, SEPIC)組成，並以交錯操作方式工作。SEPIC電路的第一半部是一個升壓轉換器，而第二半部是一個降-升壓轉換器。作為功率因數校正器(Power-Factor Corrector, PFC)的升壓轉換器工作在不連續導通模式(Discontinuous Conduction Mode, DCM)，使本電路實現了高功率因數校正與低電流總諧波失真(Total Harmonic Distortion of Current, THDi)。共用一個耦合電感器的兩個降-升壓轉換器工作在接近邊界導通模式(Boundary Conduction Mode, BCM)。無需使用任何主動箝位電路、輔助開關和吸收電路，主動開關實現了零電壓切換導通(Zero-Voltage Switching on, ZVS)，所有二極體實現了零電流切換截止(Zero-Voltage Switching off, ZCS)。首先，分析了穩態下的操作模式，並推導出了設計元件參數的數學方程式。最後，製作並測試了一個額定功率為210 W的雛型電路。將模擬與實驗結果進行交叉比對，驗證所提出電路之可行性。
並列摘要
This Thesis proposes A High-Power-Factor Wide-Output-Range AC-to-DC Conversion Circuit Based on Interleaved Single-Ended Primary Inductance Converters is proposed. The circuit topology mainly consists of two improved single-ended primary inductance converters (SEPIC) with interleaved operation. The first semi-stage of SEPIC is a boost converter while the second semi-stage is a buck-boost converter. The boost converters that serves as high power factor correctors (PFC) and low total harmonic distortion in current (THDi) are designed to operate at discontinuous conduction mode (DCM). The two buck-boost converters that share a common coupled inductor are designed to operate at near boundary conduction mode (BCM). Without using any active clamping circuit, auxiliary switch and snubber circuit, the active switches satisfy zero-voltage switching on (ZVS), and all diodes satisfy zero-current switching off (ZCS). First, operation modes in steady state are analyzed, and the mathematical equations for design component parameters are derived. Finally, a prototype circuit with a rated power of 210W was constructed and tested. The simulation and experimental results were cross-compared to verify the feasibility of the proposed circuit.