變頻器被廣泛的應用在馬達驅動器，其中又以工業用馬達為大多數，如水泵、風扇等長時間運轉系統。一般傳統變頻器架構會是採用硬性切換的模式，容易導致切換損失與產生電磁干擾等問題。為了改善傳統架構的缺點，本論文提出零電壓切換技術並應用於永磁同步馬達驅動器。此變頻器電路係加入一組輔助換向電路，配合五段式交變載波SVPWM，製造可柔性切換的時機，進而完成零電壓切換。本論文將先探討傳統變頻器架構之硬性切換現象及其問題，再分析零電壓切換變頻器的電路架構及工作原理，並提出整體系統之軟硬體設計理念，最後利用實驗成果，證明所提的電路架構，於特定穩態操作區間時，確實能夠減少切換損失，相較一般傳統的變頻器架構，可以提升高百分之三的效率，並降低功率開關元件的切換暫態電壓變化與溫升速度，對處於長期運轉且負載穩定的工業用永磁同步馬達驅動系統有顯著的改善。

Three-phase Inverters are widely used in motor drive systems, among which industrial motors are the majority, such as water pumps and cooling fans. These types of motors usually work for long period of time carrying steady loads and consume significant amount of electricity. The traditional inverter topology operates in hard-switching mode, which leads to a lot of switching loss and electromagnetic interference. In order to eliminate the flaw of the traditional inverter, this paper proposes a zero-voltage switching (ZVS) technique and applies it to a permanent magnet synchronous motor (PMSM) driver. The proposed inverter topology adds one auxiliary commutation circuit and combined with the five-segment alternating carrier SVPWM to create ZVS timings. Furthermore, this paper provides analysis for the working principle of the zero-voltage switching inverter and explain the design consideration of its resonant components. Finally, experimental results were presented to show that the proposed ZVS inverter can reduce the switching loss in specific steady-state operating load range. Compared with the conventional inverter, the proposed ZVS inverter can improve the efficiency of the motor driver by 3%, and also reduce the voltage change slope and temperature of the power switches.

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