本文為研製一個數位控制的單級順向式功因校正轉換器,並利用接枝法之原理將升壓式(交流-直流)功率因數修正電路與順向式轉換器直流-直流合併,整合為具有功率因數校正之單級順向式轉換器。此種轉換器的優點為功率因數校正級與輸出穩壓級共同使用一個功率開關,因而減少開關元件的數目與控制電路,藉此降低成本。 為了設計數位控制器,本文推導單級順向式轉換器的小訊號分析,並以模擬結果驗證控制器的設計,最後以Texas Instrument TMS 320 F2812數位信號處理器為控制平台,完成數位控制器設計。 本文所研製之轉換器的規格如下︰ 輸入電壓 = 110 V/VAC,60 Hz 輸出電壓 = 12 V 額定輸出功率 = 100 W 實驗結果證實,本文所設計與製作的單級順向式功因校正轉換器,此轉換器之功率因數可達90%以上。
This thesis is to design and realize a DSP-based single-stage forward converter (SSFC) with power factor correction (PFC). By switch replacement method, the single stage forward converter is derived from boost PFC and DC/DC converters. The converter using only one switch for both PFC and forward converter takes advantage of reducing the amount of switch and control circuit and thereby reducing the cost. Small-signal model is derived to design the digital controller of single-stage forward converter. Simulation results confirm the correctness of design. And a control platform based on Texas Instrument DSP (TMS 320 F2812) is built to realize the designed digital controller. The specifications for this design are as follows. Input voltage = 110 V/VAC,60 Hz Output voltage = 12 V Rated output power = 100 W Experimental results show the fact that the power factor for the single-stage forward converter is greater than 90%.