新型單開關零電流切換串聯負載共振式轉換器

A Novel Single-Switch Series-Loaded Resonant Converter with Zero-Current-Switching Scheme

廖建程(Jian-Cheng Liao)

指導教授 ： 王永山

共同指導教授 ： 莊英俊(Ying-Chun Chuang)

崑山科技大學/工程學院/電機工程研究所/碩士(2012年)

摘要

就目前為止E類共振式轉換器是所有轉換器中效率最高的，此種轉換器具有低電磁干擾、低切換損失、體積較小、高效率、低成本等優點，由於工作在高頻的操作摸式，共振式轉換器會因共振槽中的共振電感以及共振電容不同的排列組合而產生不同的共振效果，而且共振式轉換器當功率電晶體在做切換時可以達到零電壓切換(Zero Voltage Switching，ZVS)或零電流切換(Zero Current Switching，ZCS)，故可減少功率開關切換時所造成的切換損失，提昇轉換器之效率，減少切換時造成不必要的能源浪費。
本論文提出一個新型單開關切換串聯負載共振式轉換器，將功率開關在零電流切換(Zero Current Switching，ZCS)狀態下操作，有效降低其切換損失，提昇轉換器之效率，並且只使用單一個開關來進行高頻的切換，相較於傳統的D類轉換器的雙開關，運用單一開關效率勢必會比較高，並且結合共振槽所組成的電感以及電容產生所需要的共振電壓與電流，且可以藉由調整功率開關的切換頻率來達到柔性切換的特性，以及控制輸出的電壓與電流。
本論文將實作新型單開關切換串聯負載共振式轉換器的元件參數、規格結果與摸擬結果互相比較，驗證本論文所提之新型單開關零電流切換串聯負載共振式轉換器，最後經實測證明此新型單開關零電流切換串聯負載共振式轉換器整體電路效率達96%，實作結果令人相當滿意，也達到預期之目標以上。

關鍵字

柔性切換 ； 轉換器 ； 零電流切換

並列摘要

Up to now the class-E resonant converter of all kinds is the most efficient converter. The converter shows with low electromagnetic interference, low switching losses, smaller size, high efficiency and low cost advantages. In the high frequency mode, the resonant converter caused by the different resonance effects due to the different permutations and combinations of the resonance of the resonant tank inductor and resonant power. The resonant converter when the power transistor does the switch could achieve the zero voltage switching or the zero current switching, so that is able to reduce the loss at the power switch. To enhance the efficiency of the conversion rate and reduce unnecessary waste of energy the time of the switch.
This thesis presents a new single-switch series load resonant converter. Using the power switch at zero current operating effectively reduces the switching losses, and promotes the efficiency of the converter. Besides only using the single switch runs high-frequency switching, Compared with traditional class-D converter would obtain the higher conversion efficiency, and the combination of the resonant tank consisting of inductors and capacitors produces the desired voltage and current. At the same time by adjusting the switching frequency of the power switch achieves the flexible switching characteristics, and controls the output voltage and current.
Distal of this thesis would implement a series of load converter switch of new single-component parameters, specifications and simulation results, and then are compared with each others to verify the proposed new single-switch zero-current switching series load resonant converter. Finally, the experimental results show that this new single-switch zero-current switching series load resonant converter, the overall circuit efficiency by up to 96%. The result shows quite good, and also achieve the desired goals or more.

並列關鍵字

Soft-switching ； Converter ； Zero-current switching

參考文獻

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