- 學位論文
數位式相移全橋轉換器之研製
Design and Implementation of Digital-Controlled Phase-Shift Full-Bride Converter
摘要
本文目的是設計一快速動態響應補償使得穩定時間(Settling time)縮減的控制器應用於數位式相移全橋轉換器。首先，相移全橋轉換器的電路模型是使用網路分析儀所量測以及根據所測得的迴路增益結果，可以利用曲線擬合方法取得相符合的轉移函數。而在設計相移全橋轉換器轉移函數的補償器時，是使用三個極點與兩個零點的補償器取代使用傳統比例-積分(Proportional-Integral)補償器，此目的是為了提供更多的相位自由度。所提出設計的補償器，有助於快速動態性能且能優於傳統補償器。 本文利用德州儀器公司所產的數位信號處理器TMS320F28035為控制平台；本文所研製的詳細規格包含輸入直流電壓為400 V、輸出電壓為12 V、輸出電流為40 A、最大功率為480W及切換頻率 50 kHz。 由實驗結果顯示所提出的控制器可讓輸出穩定時間縮短18%至21%，而動態負載的變化分別為負載的20%至50%以及負載的50%至100%。並且在波德圖之下探討相同頻寬時，所提出的控制器可以增加相位邊際。
並列摘要
The purpose of this thesis is to design a fast dynamic response compensator makes the settling time to reduce for digital-controlled phase-shift full-bridge converter to give fast dynamic response. First, the model of phase-shift full-bridge converter is measured by network analyzer. And the corresponding transfer function is derived based upon the measured results of loop gain via the curve-fitting method. With the transfer function of phase-shift full-bridge converter, instead of using conventional proportional-integral compensator, a three-pole two-zero compensator is designed to give more degrees of freedom. The designed compensator which is contributes to fast dynamic performance as compared to conventional compensator. In this thesis, a Texas Instruments digital signal processor (DSP) TMS320F28035 is used to control the power converter; the specifications are as follow: input DC voltage of 400 V, output voltage of 12 V, maximum output current of 40 A, maximum power of 480W and switching frequency of 50 kHz. Experimental results will show the settling time for the presented compensator is shortened by 18% to 21% as load changes from 20% to 50% and 50% to 100%, respectively. Moreover, the phase margin can be increased base on the same design specification of bandwidth under Bode plot.