研究生: |
林彥任 Yen-Jen Lin |
---|---|
論文名稱: |
數位電流控制模式返馳式轉換器之研製 Design and Implementation of a Digital Current-Mode Controlled Flyback Converter |
指導教授: |
劉益華
Yi-Hwa Liu |
口試委員: |
羅有綱
Yu-Kang Lo 王順忠 Shun-Chung Wang 郭見隆 Jian-Long Kuo |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 65 |
中文關鍵詞: | 返馳式轉換器 、電流模式控制 、數位控制 |
外文關鍵詞: | flyback converter, current mode control, digital control. |
相關次數: | 點閱:437 下載:10 |
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返馳式轉換器是最常應用於低輸出功率的交換式電源(SMPS)電路。對於返馳式轉換器而言,電壓控制模式與電流控制模式方案都可以應用。然而,電流控制模式擁有較多的優勢,如較好的輸入電壓調節率、簡單的補償器設計,良好的輸出動態響應,和內迴路的逐週期電流限制。另一方面,數位化控制的交換式電源具有的優勢,包括零件成本的降低、靈活的設計,更可免除因環境條件變化造成零件變異的影響。因此,發展數位電流控制模式技術的返馳式轉換器是不可或缺的。在數位硬體架構上要實現電流控制模式,主要的困難點在於轉換器的開關頻率相當快速。因此,它可能在快速變化的電感電流中,每一週期只能取樣一次信號。否則,它需要一個非常快速的類比數位轉換器和過於複雜的數位信號處理程序。
本論文探討數位式電流模式控制的返馳式轉換器。首先,使用UC3844 PWM控制IC實現類比電流模式控制的返馳式轉換器電源電路。接著,使用相同的電源電路架構,改以數位電流控制模式,採用 Microchip開發的dsPIC33FJ16GS502數位信號控制器(DSC)為核心。最後,由這兩個返馳式轉換器的實驗結果驗證所提出數位控制演算法的正確性,並根據實驗結果顯示類比與數位控制方式皆可以實現效率高於 84%之返馳式轉換器。
Flyback converter is the most commonly used switched mode power supply (SMPS) circuit for low output power applications. For flyback converter, both voltage mode control and current mode control scheme can be applied. However, current mode control scheme boasts the advantages such as superb line regulation, simple compensation design, robustness to large load variations, and inherent cycle-by-cycle current limiting. On the other hand, digital control of SMPS has the advantages including components cost reduction and more flexible design. It is also immune to component changes that may arise due to changes in the ambient conditions. Therefore, developing a digital current-mode control technique for flyback converter becomes essential. The main difficulty in implementation of current-mode control in digital hardware lies in the fact that the switching frequency of the converter is fast. As a result it may only be possible to sample the fast changing inductor current only once in a switching period. Otherwise it would require a very fast ADC and excessively complex digital signal processing.
In this thesis, the digital control technology for a current mode flyback converter is investigated. Firstly, an analog current mode flyback converter is built using the UC3844 PWM control ICs. Next, using the same power stage, a digital current mode control scheme using the Microchip dsPIC33FJ16GS502 digital signal controller (DSC) is developed. Finally, experimental results of these two flyback converters will be provided to validate the correctness of the proposed digital control algorithm. According to the experimental results, both the presented flyback converter can achieve efficiency higher than 84 %.
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