- 學位論文
主動式功率因數校正之模糊控制器設計
Fuzzy Logic Controller Design for Active Power Factor Correction
摘要
隨著電子產業快速的發展，各種電子產品所需的切換式電源轉換器也大幅增加，因此提高電子產品的電能利用效率，是各國先進致力於研究的議題。由於電力設備含有非線性元件，使得電能轉換必須耗費不必要的功率，然而功率因素校正的目的，即是使得輸入電流的相位與輸入電壓同相，此刻負載就等效於純電阻性負載，電源只提供我們所需要的實功率。 功率因數校正可分類為被動式與主動式兩種，被動式功率因素校正即是利用被動元件，如電感、電容等進行相位補償，當然我們不能隨著負載變動而隨意更換補償元件，因此被動式功率因數校正有其不完善之處；然而在此我們致力於主動式功率因數校正，意即利用開關的切換配合控制法則來達到相位補償。 因為電源轉換電路是屬於非線性系統，我們提出以模糊邏輯的方式來設計控制器，在不需推導煩雜的數學方式下，也能達到功因校正與輸出穩壓的目的，且經由與傳統控制器之比較，我們得知在相同功率因數下，模糊控制器之暫態響應時間較快大約五倍。
並列摘要
With the rapid development of electronics industry, the need for switching power converters has increased significantly. Therefore, increasing the energy efficiency of electronic products is a very important topic. Because the electrical equipment has nonlinear power components, it makes unnecessary power consumption. However, the purpose of power factor correction is to make the phase of input current in phase with the input voltage. Then the load will be equivalent to the pure resistive load, and the power only provides real power we need. Power factor correction can be classified as passive and active. The passive power factor correction is to use the passive components to compensate for the phase such as inductors, capacitors, etc. But we cannot arbitrarily change compensation components we need with changes in loading. Therefore, passive power factor correction has its disadvantage. In this thesis, we use active power factor correction to switch elements and compensate for the phase. Because the power conversion circuits are nonlinear systems, we propose a fuzzy logic controller to replace the traditional PI controller. Without detail mathematical derivation of the system, the proposed method will be able to achieve power factor correction and output voltage regulation purposes. After comparing with traditional controller, the transient response of power factor corrector with fuzzy controller is faster than traditional one in the same condition of power factor.