- 學位論文
零電壓轉移脈波寬度調變昇壓式蓄電池充電器
Zero Voltage Transition Pulse-Widith-Modulated Boost Converter for Chargers
摘要
本論文實現零電壓轉移脈波寬度調變昇壓式蓄電池充電器以降低開關的切換損失，提升充電器的充電效率。充電器中主開關在零電壓時導通而昇壓二極體在零電流時截止，開關的切換動作是利用共振時完成。本論文所發展具柔切技術之蓄電池充電器相較於傳統昇壓型轉換器具有較高效率、較低開關應力及電磁干擾。 本論文針對兩個主動開關的切換，採取脈波寬度調變的控制方式，依據開關導通情形分析電路工作原理，建立電路的操作模式與等效電路，並以此等效電路為基礎，推導電路參數的設計方程式。實際電路量測結果驗證所提蓄電池充電器之理論有效性，實際平均充電效率為91.25%。
並列摘要
This thesis realizes a zero-voltage-transition pulse-width-modulated boost battery charger for reducing switching losses caused by the switch to enhance the charging efficiency of battery charger. The main switch in the presented battery charger is conducted under zero-voltage condition and the boost diode is cut off under zero-current condition. The switching operation of the switch is completed under the occurrence of resonance condition. The developed battery charger with soft-switching technology has higher efficiency, lower stress on the switch and lower electro-magnetic interference (EMI) over the battery charger with traditional boost converter. This thesis employs the pulse-width-modulated control mode for the switching of two active switches. The operation modes of the circuit and the equivalent circuits are constructed by analyzing the operating principles of the circuit, based on the turn-on conditions of the active switches. The equations used to determine the circuit parameters are derived from the equivalent circuits. Experimental results have demonstrated the theoretical effectiveness of the developed battery charger circuit. The practical mean charging efficiency of the developed battery charger is 91.25%.