- 學位論文
具兩段主動式功因修正及兩段半橋式諧振電源供應器之研製
Study and Implementation of Two Stage Half-Bridge Resonant Power Supply with Tow Stage Active Power Factor Correction
摘要
本論文為主動式功因修正器配合諧振式半橋電源供應器之研製，首先討論主動式功因修正器之動作原理，改善電壓變化量之大小，以實現高功因、高效率及低電流諧波，並將主動式功率因數修正電路設計為兩段式輸出電壓，以改善功率因數修正器之效率，在交流轉直流方面提供半橋諧振式電源供應器作為穩定直流電源輸入。其次討論半橋式諧振電源供應器之動作原理，在切換過程達到零電壓切換，並配合主動式功因修正之多段變化，進而改良半橋式電源，以配合輸入電壓源之變化而變化，設計為兩段式不同的一次側匝數比，並降低功率元件開關損失及切換應力，當變頻控制頻率跟隨諧振頻率，亦能在工作時效率保持著最佳狀態。 最後，製作此電源供應器電力系統，架構在負載變動下實際量測及探討兩段式架構，其中電源供應器輸入電壓為90Vac~264Vac，PFC輸出電壓為250Vdc / 400 Vdc ，半橋轉換後輸出電壓為 5 Vdc /5A，12 Vdc /5A，24 Vdc /11A，實驗結果顯示出最佳化效率並改進整體系統在低輸入電壓時之線路溫度熱平衡。
並列摘要
This thesis presents results of study and implementation of half bridge resonant power supply with active power factor correction. Firstly, active two-stage power factor correction approach was discussed to rectify the wave form distortion of bridge current and realize high power factor, high efficiency and low current harmonics. Afterward, it gave a stable high quality and two dc power inputs for half bridge resonant power supply. Secondly, half bridge resonant power supply could achieve Zero Voltage Switching (ZVS) in the switching process to reduce power losses. When the variable frequency control was used for tracking the resonant frequency, this process also helped keep the system operated at the optimal condition. Finally, the realization of power supply system was implemented, measured and analyzed under load variations. The power supply was operated under 90Vac~264Vac input voltage range and 5Vdc / 5A、12Vdc / 5A、24Vdc / 11A was measured as outputs. The experimental results showed that as optimum efficiency of proposed system could improve low line overall circuit thermal balance.