LLC串聯諧振變換器之迴路增益量測與補償器設計

Abstract

近年來LLC諧振式電源供應器已有許多的實際應用，其高效率與低電磁干擾雜訊為主要特徵，本論文著重在如何針對此轉換器來設計閉迴路的補償器。 小訊號分析廣泛的被用在許多的直流轉換器中， 然而，這些小訊號模型無法套用到LLC轉換器上。本論文以半實驗方式來近似所求，而不是利用數學的分析模型。用實驗的方式來得控制端對輸出端的轉移函數，透過數學方程式來描述所量測到極點–零點的位置，進而求得近似轉移函數。如此補償器就可以用此一結論來設計，透過一個實際的例子可以闡明設計的程序，並驗證其以上所設計的結果。

LLC resonant power supplies have found many practical applications in recent years. It features high efficiency and low EMI noise. The focus of the thesis is to on the design feedback loop compensation for such a converter. Small-signal models have been used extensively in many DC converters. However, the model is not applicable to LLC converter. In the thesis, a semi-experimental approach is taken. Instead of counting on analytical model, the control-to-output transfer function can be experimentally measured first and pole-zero locations are mathematically found. The compensator can then be designed based on this result. A practical example was used to illustrate the design procedure. The result was experimentally verified.