本論文主要的目的，是研製一數位式並聯型主動功率因數修正電路(Active Power Factor Corrector)。首先介紹各種單開關標準串聯式功率因數修正器之工作原理，之後介紹雙開關標準串聯式功率因數修正器之工作原理、雙開關半橋串聯式功率因數修正器之工作原理，最後介紹四開關標準串聯式功率因數修正器之工作原理。
並且分析數位式並聯型主動功率因數修正電路包括主電路詳細電路圖及控制電路如：加法器、電壓感測器、電流感測器、回授電路等硬體電路的結構，計算主電路電感、電容值的設計。
然後再根據輸入電流斜率控制法則，深入討論單相並聯式功率因數修正電路之輸出電容電壓與輸入電流波形失真之間的關係。最後再討論固定值的電容電壓對效率的影響。

The subject of this thesis is to determine the level of the reference DC voltage of a shunt active power factor corrector (APFC) according to the load changes. At first, we will introduce single-switch the operating principles of series power factor correctors for single-phase systems. After,we will introduce double-switch the operating principles of series power factor correctors, double-switch half-bridge the operating principles of series power factor correctors, finally, four-switch the operating principles of series power factor correctors for single-phase systems.
And analytical digital shunt active power factor corrector circuit,including the main circuit diagram in detail, the control circuit hardware circuit structure such as：addition, voltage sensor, current sensor, feedback circuit and calculation of the main circuit inductance, capacitance the value of design.
Then following the rules of the input current slope control strategy, the relation between the output DC voltage of a shunt APFC and the distortion level of the source current waveform is discussed in detail. Finally, based on the proposed theory, the impact on the efficiency the capacitor voltage is discussed.

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