具有功率因數修正及半橋轉換器之電源供應器的研製

本論文旨在設計並研製一應用於伺服器電腦且具有高效率的電源供應器。其功率為600瓦，效率能符合80Plus白金牌標準。在20%負載，10%負載下功率因數值，有0.8以上且總諧波失真小於25%，並符合IEC 61000-3-2 Class A的標準。前級功率因數修正器採用平均電流控制法，具有較佳的功率因數值和低總諧波失真因數。後級直流轉換器使用半橋式LLC諧振轉換器，其具備零電壓切換，降低切換損失。當LLC操作在Region 2，其具有輸出增益大於1的特性，這將可以增加輸出電壓的保持時間、縮小輸入電容的容值和體積。二次側則採用同步整流，減少二次側的導通損失，達到高效率的目的。最後，實際研製一台可應用於伺服器電腦之高效率電源供應器，並量測相關波形和數據，實驗結果證明，其效率可符合80 Plus白金牌，功率因數值與總諧波符合IEC 61000-3-2 Class D的標準。

關鍵字

80Plus ；功率因數修正器；半橋轉換器；零電壓切換；同步整流； IEC61000-3-2 Class D

並列摘要

The subject of this thesis is to design and implement a high efficiency power supply which efficiency can meet 80 Plus Platinum specifications. The power factor is more than 0.8 and current THD is less than 25% under 10% load conditions and thereby meeting the Code of IEC 61000-3-2 Class D. This power supply is composed of two stages. The front stage, AC-DC stage is the power factor corrector and DC-DC stage is half bridge LLC resonant converter. PFC uses average current mode control and has better PF and low THD than peak current mode. DC-DC stage uses half bridge LLC resonant converter, as switch of primary side turns on can achieve zero-voltage switching (ZVS) and secondary side can achieve zero-current switching (ZCS), and decrease switching loss. The output gains greater than 1 characteristic as the LLC operates in the region 2. It can help us to increase the hold up time and reduce the bulk capacitor size and capacitance. In secondary side, MOSFETs are used for synchronous rectification to further reduce conduction loss. Finally, a 600W power supply with 12V/50A is implemented. The efficiency curve will meet 80Plus Platinum standard. PF and harmonics meet IEC61000-3-2 Class D.

並列關鍵字

80 Plus ； Power Factor Corrector ； Half Bridge Converter ； Zero Voltage Switching ； Synchronous Rectification ； IEC 61000-3-2 Class D

參考文獻

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具有功率因數修正及半橋轉換器之電源供應器的研製

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