一般家用電器中驅動永磁同步馬達的變頻器透過整流器獲得直流電，再透過開關切換技術變流為輸入馬達的交流電力。而整流時通常會在直流端並聯大容值的電解電容用以平衡輸入與輸出的功率差值，來達成穩定直流的作用，但是使用大容值電解電容會有壽命較短以及功率因數較低等問題；此外，馬達在驅動時開關切換造成的非線性影響也會造成電源端功因低落，需要透過功因校正來改善，一般會使用額外的開關元件及電感來達成，但同時也增加了體積與額外損耗。
為改善上述馬達變頻器具有的問題，本文利用低容值之薄膜電容進行永磁同步馬達驅動，可以有效提升整體的功因和系統壽命，但是降低容值會造成直流端電壓產生劇烈波動，造成馬達控制不穩定等問題。因此本文透過負載分析，確認應用系統之穩定性，再配合電流控制調整電源端輸入電流與電壓之間的相位差進一步提高功因，不需使用額外的功因校正電路，因此可實現縮減電路體積及降低整體成本。

In general home appliances, bridge rectifiers are commonly used to convert AC input into DC output and supply the inverter with DC input power that is used to drive permanent magnet synchronous motors (PMSMs).
Nowadays, large value aluminium electrolytic (ALE) capacitors are usually utilized at the DC-link of motor drives to balance the input power for the inverter, which can stabilize the fluctuations of the DC-link voltage. However, large capacitances may shorten the lifetime of the driver and reduce the power factor of the system. Also, the non-linear effect caused by the inverter switching method of the driver would lead to a low power factor, which should be improved by power factor correction (PFC).
Generally, additional electronic components and inductors can be used in order to achieve high input power factor, but at the same time, it will also increase the system volume and cause another unnecessary loss. Due to the above mentioned problems, in this thesis, small film capacitance is applied, which can effectively enhance the input power factor and extend the lifetime of the overall system. Nevertheless, reducing the capacitance will cause a critical voltage fluctuation to the DC-link. As a result, many problems would emerge such as high torque ripple. Therefore, this thesis confirms the stability of the application system by load analysis, and adjust the phase difference between the input current and the voltage of the input power with the current control method. The proposed methods, not only improve the power factor, but also eliminate additional PFC circuit. They also reduce the overall circuit volume and lower the cost of system down.

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