- 學位論文
高效率高功因升壓型AC/DC整流器之分析與研製
Analysis and Implementation of a High Efficiency High Power Factor Boost AC / DC Rectifier
摘要
本論文提出高效率高功因升壓型AC/DC整流器，係利用主動式功因校正技術的平均電流控制法，提高升壓型整流器之功率因數，降低輸入電流諧波，並利用柔性切換技術提升整流器之整體效率。 高效率高功因升壓型AC/DC整流器，係利用內迴路電流控制器，使輸入電流能夠追隨輸入電壓波形，使輸入電流能達到高功因特性；利用外迴路電壓控制，使整流器輸出電壓，不因輸入電壓振幅變動以及輸出負載變動而改變。此外，再利用零電流零電壓轉移之柔性切換輔助電路，使輔助開關在一個切換週期內切產生兩次瞬態共振，使主開關達到零電壓切換以及零電流切換，降低傳統PWM整流器之切換損失，以提升整流器之整體效率。 本論文分別使用功因校正控制IC UC3854作為類比控制核心，以及數位訊號處理器dsPIC30F4011作為數位控制核心，實現高效率高功因升壓型AC/DC整流器，其實作之電氣規格為輸入電壓 、輸出電壓400 V，最大輸出功率400 W。由實作結果驗證提出之整流器具有高功因及高效率特性，其中最高效率可達96.1 %，此外，在輸入電壓振幅變動以及輸出負載變動下，整流器均具有良好之輸出穩壓特性。
並列摘要
A high efficiency high power factor boost AC / DC rectifier is proposed in this thesis. The average current-mode control (ACC) method is used to obtain high power factor and low input current harmonic distortion of the proposed rectifier. Moreover, a zero-voltage-zero current transition (ZVZCT) soft-switching technique is also applied to increase the overall efficiency of the proposed rectifier. The average current-mode control (ACC) method includes two control loops. The inner loop is used to force the average input current following the rectified input voltage to achieve high power factor. The outer loop is controlled to regulate the output voltage despite the variations of the output load and line peak voltage. On the other hand, a ZVZCT soft-switching auxiliary circuit is added into the conventional PWM boost rectifier. The auxiliary switch turns on twice in a switching period to induce two transient resonances. The main switch thus can achieve zero-voltage switching (ZVS) at turn on and zero-current switching (ZCS) at turn off. As the result, the switching losses of main switch can be well reduced, and the overall efficiency of the rectifier is then increased. In this thesis, the power factor correction control IC UC3854 and digital signal processor dsPIC30F4011 are respectively used to build universal input voltage , output voltage , output power prototypes of high efficiency high power factor boost AC / DC rectifier. The performance of high power factor and high efficiency is thereby validated by experimental results. The highest overall efficiency is 96.1%. Additionally, it also reveals from the experimental results that the output voltage can also be regulated in the presence of the variations of the output load and line peak voltage.