準諧振型返馳式電源轉換器之智慧型模糊比例積分型控制器

Intelligent Fuzzy PI Control of a Quasi-Resonant Flyback Converter

盧明志(Ming-Zhi Lu)

指導教授 ： 李祖添

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00051

摘要

本論文中，我們使用準諧振型返馳式電源轉換器，藉由變壓器的磁化電感與開關的寄生電容所構成的諧振電路，使開關兩端的跨壓震盪到零時將開關打開，來達到零電壓切換，大大的減少切換損失。電源轉換器控制方面主要分為兩種，電壓模式控制(VMC)和電流模式控制(CMC)。兩種方法都必須求出電源轉換器的小訊號模型，透過控制理論去設計補償器的極零點位置，來改善閉迴路系統的性能。過程非常地繁雜。因此，我們針對準諧振型馳返式電源轉換器提出比例積分型模糊控制器。它主要的優點在於不需導出任何電源轉換器的數學模型，只需針對模糊控制器設計設適當的模糊規則庫，即可達到控制目的。這種方法非常適合用在非線性且時變的直流-直流電源轉換器上。除此之外，使用比例積分型模糊控制器可以得到較大的負載變動範圍與較快的動態響應。最後，模擬結果顯示我們所提出方法的可行性及實用性。

關鍵字

模糊比例積分器 ； 準諧振型返馳式電源轉換器

並列摘要

In this thesis, we use the quasi-resonant (QR) flyback converter to greatly reduce the switching losses by turning on switch at the zero voltage point generated by the resonance between the magnetizing inductance and parasitic capacitance of the switch. Two major types of control in the power converter are voltage mode control (VMC) and current mode control (CMC). Both of these methods must be derived a small signal model through the control theory to design the location of pole and zero of compensator to improved the performance of the closed-loop system. However, the process of the design is very complicated. Therefore, we propose a PI-type fuzzy logic controller for QR flyabck converter. Its major advantage is that expert knowledge can be incorporate into the fuzzy controller using simple linguistic rule to achieve the control objective without involving the power converter’s mathematical model. This makes it well suited in resolving the time-varying nonlinear nature of DC-DC power converter. In addition, we use a fuzzy controller to obtain a large range of load changes and fast dynamic response. To illustrate the effectiveness and applicability of the proposed method, simulation results are provided.

並列關鍵字

Fuzzy PI controller ； Quasi-Resonant Flyback Converter

參考文獻

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