本文提出一全數位化控制之昇壓型交流/直流轉換器,採用多迴路控制架構,包含電流內迴路及電壓外迴路,藉此完成平均電流模式(Average current mode),使輸入電流能追隨正弦命令電流及調整輸出端電壓。 為了設計數位控制器,本文將推導昇壓型轉換器之平均電流模式控制的數學模式,由模擬驗證此控制器之性能。最後研製一以Texas Instruments DSP為控制平台,輸入電壓90~264V,輸出電壓390V,最大輸出功率500W之昇壓型轉換器。由實驗結果顯示,所研製之數位式功率因數修正器具有高功率因數、高效率、低諧波失真及寬廣的線電壓範圍等優點。
The main theme of this thesis is to present a digital controlled AC/DC boost converter. The controller consists of two control loops. The inner loop is controlled using average current mode control to force the current following its reference to improve the power factor, and the outer loop is for voltage control to control the DC-link voltage. To design the controller, the mathematic model of the boost converter using average current mode is derived. Simulation results demonstrate the performance of the designed digital controller. The digital controller of AC/DC boost converter is implemented using Texas Instruments DSP-based board. The details of the specification are as follows: input voltage is universal from 90V to 264V, output voltage 390V and maximum output power is 500W. The experimental results show that the implemented system is with the following advantages: high power factor, high efficiency, low THD and wide range of line voltage.