本論文研製一高功因全橋相移式零電壓轉換器,其主動功因修正器(Active Power Factor Corrector),使用UC3854N控制IC,一方面使輸入電流波形追隨電壓波形達到高功因,減少諧波污染電力系統,另一方面進行交流直流轉換提供給穩定電源至後級全橋相移式零電壓轉換器。全橋相移式零電壓轉換器,使用 UC3875 控制 IC 作脈波寬度調變 (PWM) 控制,使四功率開關在切換過程達零電壓切換 (Zero Voltage Switching, ZVS),有效降低開關切換帶來的雜訊與損失,以提高系統效率。因此整個轉換器為具有高功因、高效率之轉換器。
In this thesis, the design and implementation of a high power factor full bridge converter with phase-shift-zero-voltage switching is presented.The controlling device IC UC3854N is used so that the input current will track the input voltage to achieve high power factor and to reduce the harmonic pollution,moreover, the output of active power factor corrector is transferred to a full-bridge voltage converter with phase-shift and zero-voltage-switch.The IC UC3875 is used to achieve zero voltage switching. It can reduce the noise and loss while the switch is switching, and the total efficiency is increased.