本文旨在研製蓄電池與大電容混合供電之電動機車驅動系統。在蓄電池充/放電方面採用兩臂型直流-直流功率轉換器作為雙向功率轉換用。在電容的充電及放電方面，採用單臂型之昇壓及降壓兩用之轉換器，具有昇壓及降壓功能且功率雙向性轉換，可應用於瞬時加載或剎車能量之回收。在六相永磁同步電動機方面，採用六個霍爾效應元件偵測之轉子位置回授信號，以完成六步方波電流操作及轉速閉迴路控制之六相同步電動機驅動器。本文以高性能的數位信號處理器(DSP, TMS320F28035)作為整體系統之控制核心，蓄電池及大電容的充電及放電控制皆由軟體程式完成，本系統已完成蓄電池電壓為48V，直流鏈電壓為48V至72V及大電容端電壓範圍為24V至80V之500W混合供電的電動機驅動系統，並由實測結果加以驗證。

This paper focuses on developing an electric vehicle drive with hybrid power supply containing battery and large capacitor. A two-arm DC-DC power converter, which is capable of converting power bidirectionally, is used to charge and discharge the battery. In addition, a single-arm buck-boost converter is designed for charging and discharging the capacitor. This buck-boost converter is able to convert the power bidirectionally, and is applicable to situations where load is applied instantaneously or energy regeneration is needed under braking operation. As regards the six-phase permanent-magnet motor, 6 Hall-effect sensors are used to detect rotor positions, generating corresponding feedback signals. Moreover, the six-phase permanent- magnet synchronous motor drive is completed by using a closed-loop control strategy of six-step current and rotational speed. A highly efficient digital signal processor,TMS320F28035, is used as the control core of the system. The charging and discharging of the battery and capacitor is controlled by software. A motor drive with hybrid power supply is built with the battery voltage of 48V, the DC bus as well as the large capacitor voltage ranges from 48V to 72V and 24V to 80V, respectively, and the output power of 500W. The experimental results obtained have validated the feasibility of the proposed control strategy.

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