- 學位論文
交錯式臨界導通升壓型功因校正電路之研製
Design and Implementation of an Interleaved CRM Boost PFC Converter
摘要
臨界模式升壓型轉換器作為功因校正電路，具有高功率因數與柔性切換的效果。在中高功率的應用電路上，為了減少輸入端之電流漣波成分，通常會採用多相交錯控制策略。在各式不同交錯控制策略中，同步導通電壓模式(Synchronized turn-on voltage mode)的控制方式簡易，且其各組電路之相位差皆能維持在一固定量。但電路在操作過程中若遇到擾動，則可能使電感電流無法維持在臨界導通模式而無法達成柔性切換。 本論文針對同步導通訊號電壓控制模式的擾動問題提出一種新型而簡單有效的補償方式，並以實作驗證其正確性。論文中先介紹各種單相升壓型功因校正轉換器的操作模式，並整理各種操作模式之優缺點。接著介紹多相交錯的控制策略及擾動造成的影響，然後詳細說明本論文所提出新型補償方式。最後以微控制器(Micro-Controller Unit, MCU)為控制核心，實作一組600W，多相交錯控制之臨界導通升壓型功因校正電路，以驗證此補償方式之正確性。
並列摘要
Boost type power factor correction (PFC) converter operated in critical conduction mode (CRM) can achieve high power factor and soft switching features. In medium-to-high power level applications, multi-channel interleaved control method was commonly adopted to reduce input ripple current. Among various kinds of interleaved control methods, synchronized turn on voltage mode is easier to implement and each sub-circuit can operate with a fixed phase shift. However, if a perturbation happened to the control signal, the inductor current will fail to maintain critical conduction mode and is not able to achieve the soft feature. This thesis proposes a simple and effective compensation method to solve the perturbation problem for synchronized turn on voltage mode, and verifies its validity by hardware implementation. In this thesis, different types of operation principles as well as their advantages and disadvantages for the boost PFC converter will be introduced. The multi-channel interleaved control methods for CRM operation and the impact of the control signal perturbation will be presented. Then, the proposed method to compensate the control signal perturbation problem for the multi-channel interleaved PFC converter will be explained in detail. Finally, experimental results obtained from a 600W prototype circuit with micro-controller unit are presented to verify the validity of the proposed compensation method.