• 作者： 許新添; 陳青鵬
• 作者服務機構： 國立台灣工業技術學院電機工程技術系
• 中文摘要： 交換式電源供應器在近十年來己漸趨普遍。雖然這種電源供應器具有體積小以及省能源的優點，它卻同時具有功率因數偏低的缺點。 過去一般改善功因的做法例如接上電感或電容等雖然可略為減輕此問題，但幅度仍然不夠。本研究便在利用電流規劃的方法使輸入電流追蹤輸入電壓並藉以提高功因。 本研究將以升壓型電路及適當的電感與電容為功率部份的電路以方便波形追蹤與負載端的穩壓，並利用平均狀態空間法以分析系統的穩定度。所設計的P1控制器以及波形追蹤並將以一MC68705單晶片微處理器配合乘法器進行實作。 以一1KVA交換式穩壓器進行實驗，其結果顯示在所設計的電路接上以前，此穩壓器的功因僅為0.63 ，接上以後其值則升達0.96，效果相當的顯著。
• 英文摘要： The switching power supply has become a popular piece of modern equipment during the pastdecade. Although it is energy efficient and compact, the power factor(PF) of such a device is usually low. Traditional approaches to improving the PF, such as adding an inductor or a capacitor, did increasethe PF to some extent, but the improvement was, in general, not satisfactory. The purpose of this researchwas to employ a current programming technique to track the waveform of the input voltage and improvethe PF. In this research, a boost-type circuit was considered and a properly selected inductor and capacitorwere incorporated. An averaging state-space model was employed in the stability analysis of the closed-loop system and a PI controller was included to cope with both the tracking of the waveform and theadaptation to the load change. The proposed current programming scheme was realized based on anMC68705 single-chip microprocessor. Experimentation with a 1KVA switching preregulator showed that, with the incorporation of theproposed controller, the PF could be increased to 0.96, compared with 0.63 when the proposed controllerwas not hooked-up.
• 中文關鍵字： switching power supply; power factor; PWM; single-chip; PI control
• 英文關鍵字： --