零電壓切換共振式太陽能蓄電池充電器之研製

Design and Implementation of Battery Charger with Zero-Voltage-Switching Resonant Converter for Photovoltaic Arrays

施凱程(Kai-Cheng Shi)

指導教授 ： 莊英俊

崑山科技大學/工程學院/電機工程研究所/碩士(2005年)

https://doi.org/10.6828/KSU.2005.00073

摘要

高頻共振式轉換器比傳統硬式轉換器有釵h的優點已為人所熟知，其中最重要的是切換損失的大幅降低、更高的功率密度，而且非脈衝的切換電流波形特性更有一個較低的電磁干擾。因此，本論文利用最少元件的電路架構，研製一高效率的零電壓切換共振式太陽能蓄電池充電器。利用零電壓切換共振式轉換器的特性曲線圖與電路方程式，設計出共振元件最佳的參數值，並結合太陽能光電板作為蓄電池充電器的主架構。然而，由於太陽能光電板輸出電壓與電流會隨日照量的變化而有所不同，會使得零電壓切換共振式充電器的操作點產生偏移，因此在太陽能光電板輸出端與零電壓切換共振式充電器間設計一閉迴路昇壓式轉換器，使零電壓切換共振式太陽能蓄電池充電器能確實操作在零電壓切換，以達到高效率的要求。
經由實驗結果可證實，本論文所提出的零電壓切換共振式太陽能蓄電池充電器，開關的導通與截止均操作在零電壓切換的情況，整個充電過程實測效率均高達75%以上。最後，再將零電壓切換共振式太陽能蓄電池充電器與傳統脈波寬度調變硬式切換充電器作比較，零電壓切換共振式太陽能蓄電池充電器確實可降低主動開關的操作溫度，以減少開關之切換損失與切換應力，進而達到提升充電器整體效率。

關鍵字

電池 ； 共振 ； 太陽能 ； 轉換器 ； 充電器

並列摘要

There are many well-known advantages with the high frequency resonant converter compared with traditional hard switching converters. The most important one is that it can reduce the switching loss, possess higher power density. In addition, the soft-switching current waveform characterizes lower electromagnetic interference. Due to these attracting characteristics, this thesis adopts the circuit structure with least component count to contrive a high-efficiency solar energy battery charger with zero-voltage-switching resonant converter. The optimal parameter values of the resonant components are designed by applying the characteristic curve diagram and electric functions derived from the circuit configuration. The charger is energized by solar electric cells. Since output voltage and current of the solar cells would change with sunlight, the operation point of the zero-voltage-switching resonant converter would be drifted away. To solve this problem, we install a close-loop-controlled boost converter between the solar cells and the zero-voltage-switching resonant to make sure that battery charger is able to operate in zero-voltage-switching and maintain the requirement of high-efficiency.
As a result of the experiment, we can confirm that the solar energy battery charger with zero-voltage-switching resonant converter this thesis brings up, in situations that switching on and off of the main switches are all operated under zero-voltage switching. The circuit efficiency of the overall charging process is higher than 75%. Finally, we compare the solar energy battery charger with zero-voltage-switchimg resonant converter with traditional pulse-width-modulation hard switching converters. The solar energy battery charger with zero-voltage-switching resonant converter can really reduce the operation temperatures of the active switches; and thus, decreasing the switching loss and the switching stress, then promoting the circuit efficiency of the charger.

並列關鍵字

Photovoltaic ； Resonant ； Charger ； Converter ； Battery

參考文獻

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