本論文係以升壓型電力轉換器作為主動式功因校正電路，為使轉換器兼具功因校正與輸出穩壓的特性，吾人利用內迴路電流控制器，使轉換器具有高功因特性；利用外迴路電壓控制器，使輸出電壓穩壓，不受線電壓及負載電阻變動影響。
文獻中，常用之電流控制法有三種：峰值電流控制法、平均電流控制法與磁滯電流控制法。吾人分別推導此三種電流控制器之小信號數學模型，並繪出其控制方塊圖。此外，在開關週期 下，若電流控制法能使內迴路之輸入電流 追隨命令電流 ，則吾人可推導出控制信號 至輸出電壓 之轉移函數。因此，吾人可設計古典PI電壓控制器，並以雙線性轉換法(bilinear transformation)，將其轉換為數位PI電壓控制器。
吾人以德州儀器(TI)生產之DSP晶片TMS320F240，實現數位PI電壓與磁滯電流控制器。在論文中，並推導數位磁滯電流控制方塊圖，以利程式之撰寫。DSP之軟體程式內包含：週邊記憶體映射暫存器之位址宣告、變數初始值設定、中斷向量設定、中斷暫存器設定、PWM輸出與計時器(1與2)設定、AD暫存器設定、中斷擷取程式、PI電壓控制器程式、磁滯電流控制器程式、與程式返回。
最後，由實作結果顯示：升壓型電力轉換器加入磁滯電流與PI電壓控制器後，輸出電壓維持在100 V，其功因為0.946。當負載變動時 ，輸出電壓仍維持在100 V，其功因為0.943。當輸入線電壓變動時 ，輸出電壓仍維持在100 V，其功因為0.941。因此，吾人所設計之數位PI電壓與磁滯電流控制器，確實可使升壓型電力轉換器兼顧功因校正與輸出穩壓。

In this thesis, the boost converter is regarded as an active power factor correction (PFC) circuit to achieve the high power factor and output voltage regulation. Therefore, an inner-loop current controller is adopted to exhibit high power factor. An outer-loop voltage controller is used to regulate the output voltage despite the variations in the input line voltage and load resistance.
In the literature, there are three kinds of the current control: peak current control, average current control and hysteresis current control. The small-signal model and control block diagram of each aforementioned controller are derived in the thesis. Moreover, assume the input current i (t) g follows the command current i (t) g ∗ over one switching period s T , the transfer function from the control signal ctrl v~ to output voltage o v~ can be obtained. The classic PI voltage controller is thus designed based on this derived transfer function. Then, it can be transferred to a digital PI voltage controller by bilinear transformation.
The digital PI voltage and hysteresis current controllers are realized by using a DSP chip, TMS320F240, produced by Texas Instruments. For program coding, the block diagram of digital hysteresis current control is also derived herein. The DSP program includes the addresses declaration of the memory mapped registers, initial values of the parameters, and the setting of interrupt vectors, interrupt registers, PWM output, timers (1 and 2) and AD registers. In addition, the codes of interrupt fetching, PI voltage controller realization, hysteresis current controller realization, and program return are also included.
Finally, the boost converter with hysteresis current and PI voltage controllers is implemented. It reveals from experimental results that power factor is 0.946 , and output voltage is regulated at 100 VDC. The power factor change to 0.943 under load variation (200 → 240 Ω) , but the output voltage is still regulated at 100 VDC. On the other hand, the power factor changes to 0.941 under input line voltage variation (50 → 60 VAC) , but the output voltage is still regulated at 100 VDC. Accordingly, the boost converter with the designed digital controllers exhibits high power factor and output voltage regulation.

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