盡可能減少電壓、電流突波及電磁輻射一直是現代電力電子發展的重要課題，在進行交流電源轉換時對於干擾的抑制就更加的重要。當使用電力電子裝置進行交流電源轉換時，對電源零交越點之檢測就成為下一電源週期進行轉換的重要依據。因此，提出一種既經濟且有效的方式進行交流電源零交越點檢測。精確的交流電源零交越點檢測可廣泛的應用於工業上，如馬達驅動器、功率因數修正器及並網型逆變器，要達成與交流電源週期同步的工作狀態，就必須依靠正確的零交越點訊號檢測來達成。零交越點檢測同時也可運用於頻率計算及交流電源相位量測。
微控制器已成為今日電力電子應用的主流，同時可利用微處理器進行程式運算以達成低成本且簡單化的雜訊消除功能。在本論文中提出以程式計算來完成具有低成本且高效率的電源零交越點雜訊檢測方式，此方式即使在高度雜訊的環境下仍然能正確的消除雜訊。在本論文中，首先對程式計算的方式進行說明，再設計相對電路及計算程式以驗證本論文的正確性。本論文採用德州儀器公司所提供之TMS320F28069數位訊號處理器及C語言編寫之作業系統來完成實際驗證的結果，最終量測結果可知交流電源50Hz時，經本論文所提程式計算後輸出頻率誤差最大及最小誤差分別為0.023%及0.002%與傳統週期區間判斷處理方式的3.272%及0.345%相比較，兩者之間的差值為140倍及170倍。於60Hz測試時，本論文處理方式最大及最小誤差分別為0.023%及0.004%與傳統週期區間判斷處理方式的2.029%及0.685%相比較，兩者之間的差值為80倍及170倍。由此比例可知有明顯改善。

One of the many issues with developing modern power electronics applications is to keep the spikes and EMI at a minimum, especially when switching AC mains in and out. Switching mains in and out at the zero crossing point requires a precise way of detecting when the next crossing will be. This raises the need for a cost efficient way to detect the zero crossing points. Accurate detection of true zero crossings is important in many fields of industrial electronics such as motor drives, power factor correctors and grid-integrated inverters, where satisfactory line synchronization requires reliable zero crossing information. Zero crossing detection can also be used for other purposes, such as frequency calculation and relative phase measurement.
Most of today’s power electronics applications are controlled by microcontrollers; this gives the possibility to prevent the noise for zero crossing detection (ZCD) in a simple and cost efficient way. In this thesis, a simple digital signal processing method is proposed for efficient noise reduction in zero crossing detectors. The proposed method is very robust against strong impulsive noise. In this thesis, a systematic design procedure will be described first, test platform and prototyping circuit are then developed later to validate the correctness of the proposed algorithm. In this thesis, the proposed algorithm is realized using TMS320F28069 digital signal controller (DSC) from Texas Instrument Corp. According to the experimental results, the steady state maximum and minimum errors for 50 Hz AC input waveform are 0.023% and the smallest error is 0.002%. Compared to conventional ZCD methods, 3.272% and 0.345%, the difference is 140 and 170 times. The steady state maximum and minimum errors for 60 Hz AC input waveform are 0.023% and the smallest error is 0.004%. Compared to conventional ZCD methods, 2.029% and 0.685%, the difference is 80 and 170 times, respectively.

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