本論文主要研製一數位交錯式降壓型功率因數修正器。採用箝位電流控制來實現，控制方式簡單且響應特性快。在此控制模式下，電感電流可操作在連續導通模式(CCM)和不連續導通模式(DCM)。在不連續導通模式時，功率開關具有零電流切換之特性；連續導通模式時，峰值電流應力較低，可減少損失改善效率。控制電路方面採用數位控制，使用德州儀器TMS320X28035微處理器做為控制核心，以數位的方式實現箝位電流模式控制。並且藉由數位控制的方式，可以對不同的輸入電壓進行斜率補償，進而提高功率因數和改善總諧波失真。本文以數學軟體Mathcad進行運算和畫出不同斜率補償的輸入電流波形。本論文完成一650W數位交錯式降壓型功率因數修正器，經實驗證明，數位控制方式，確實可以提高功率因數和降低總諧波失真。

This thesis aims to study and implement a DSP-control interleaved bridgeless buck (PFC). A clamp-current control method is applied to achieve, simple design and fast-response performance. The inductor current can be operated under continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In DCM operation, the power switches have the characteristics of zero-current switching. And the device current stress can be reduce to improve efficiency in CCM operation. A TI DSP chip TMS320X28305 is used to realize clamp-current control. The slope compensation can be adaptive with different input voltage conditions. The input power factor and the total harmonic distortion can be improved. In this thesis, a mathematics software Mathcad is used for calculating and drawing input current waveform under different slope compensation. Finally, a 650W DSP-control interleaved brigeless buck power factor corrector is implemented and tested. The experimental results show that the developed digital control can improve power factor and the total harmonic distortion compared with the conventional scheme.

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