新型E類直流/直流轉換器

A Novel Class-E DC/DC Converter

邱子維(Tzu-Wei Chiu)

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(2010年)

摘要

E類共振換流器是所有已知的換流器之中效率是為最高的，由於功率開關操作於零電壓切換(zero voltage switching；ZVS)之狀態，故其切換損失很低，而傳統的E類都為直流轉換成交流的換流器，並無直流轉換成直流的轉換器。
本文提出一個低成本與高效率的新型E類直流/直流轉換器，與傳統需要兩個功率開關的D類共振轉換器相較之下，此新型E類直流/直流轉換器只需一個功率開關，同時只需一組觸發信號來驅動功率開關，故其成本較低，控制電路製作簡單，而欲使此新型E類直流/直流轉換器的電路效率提高，必須使切換頻率高於功率開關導通時之電路共振頻率，並設計當並聯電容電壓等於零時使功率開關導通，此時電容上能量為零，切換導通時的損失幾乎不存在。所以只要元件參數選擇適當，就可使功率開關操作於零電壓切換，因而降低切換損失提高電路整體效率。
最後再經由電腦模擬與實際電路量測之結果比較，驗證本論文所提之新型E類直流/直流轉換器確實操作於零電壓切換狀態之下，具有柔性切換的特性，最後經由實驗證實此新型E類直流/直流轉換器整體效率高達90.09%，實驗的結果令人相當滿意。

關鍵字

E類共振換流器 ； 零電壓切換 ； 柔性切換

並列摘要

For all the known inverters, the efficiency of class E resonant inverter is the highest amongst them, mainly due its power rate switching operation is under a status of zero-voltage-switching(ZVS), there is a minimum loss on the switching, while for the traditional class E, the inverters are with a transfer from direct current (DC) to alternating current(AC), without conversion as DC to DC available.
In the study, to come up with a novel class-E DC/DC inverter both low cost and high efficiency, and while making comparison to the traditional class D resonant inverter required of two power rate switches, the type of novel class E DC/DC inverter is only required of one power switch, at the same time the later is only in need of one set of trigger signal to run the power rate switch, hence the cost of the latter is lower and it is simple on the making of control circuits, moreover, in order to improve on the circuit efficiency for the novel class E DC/DC inverter, it is not only necessary to make switching frequency higher than the circuit resonant frequency while power rate is switched on with current charge, but to devise at the time of current transmission when the parallel capacitance voltage is equal to zero, and since the energy on the capacitor is zero, there is nearly no loss with the switch on current transmission. As a result, if the component parameters are selected appropriately, it is okay to make ZVS on the power rate switching operation, able to lower switching loss, instead to improve on the overall efficiency of the circuits.
Finally, by the comparison of results between computer assimulation and actual circuit measurement, to verify that the novel class E DC/DC inverter suggested in the study is indeed operated under a status of zero-voltage-switching, with a soft-switching trait, moreover, as verified by experiment at last, the novel class E DC/DC inverter is with overall efficiency rate as high as 90.09%, to be quite satisfied on such a result.

並列關鍵字

zero-voltage-switching ； class E resonant inverter ； Soft-Switching

參考文獻

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