應用多相切換方法以模塊化不同額定功率電源之並聯

為了提高輸出功率，本文提出了藉由直接或重疊方式的多相切換，以模塊化並聯相同或不同額定功率的多組直流電源。藉由分時多工（Time Division Multiple Access, TDMA）的概念，每個電源接受微控制單元(Micro Controller Unit, MCU)的命令，在指定的時隙將其峰值功率傳輸到系統負載，但其平均值仍為既有的額定值。這種方法的優點，乃是各參與並聯的直流電源不必重新設計其回授電路。我們為多相切換並聯電源的架構，提出了小訊號模型，以進行穩定度分析。此外，還針對多相切換功能，建構了軟體元件，搭配既有的套裝軟體(MATLAB Simulink)，在個人電腦上，以模擬方式驗證我們設計確實可行。論文中除了探討系統的參數設定和微程序控制步驟，本文另一貢獻為節能。因為傳統的電源並聯使用的隔離輸出開關；二極體，被取代了。二極體的缺點是其順向偏壓會造成功率損耗。我們使用由兩個金氧半場效電晶體(Metal Oxide Semiconductor Field Effect Transistor, MOSFET) 組成隔離輸出開關代替二極體。由於沒有順向偏壓，所以減少功率浪費。輸出隔離部件散熱器的尺寸因而得以縮小。新設計在節省能源和空間的效果是顯著的。我們選定了240W和240W兩組相同額定功率的直流電源，並聯後得到480W的輸出功率。亦選定了60W和45W兩組不同額定功率的直流電源，並聯後得到105W的輸出功率。從軟體模擬和硬體實驗，都驗證了多相切換法是可行的。

關鍵字

電源並聯；不同額定功率；多相切換法；減小散熱片尺寸；分時多工

並列摘要

For the purpose of increasing the output power, the direct or the overlapped methods by multi-phase switching is proposed. Several DC(Direct Current) power supplies of the same or different rated powers are modularly parallel connected together. The direct and the overlapped methods by multi-phase switching are proposed. With the concept of Time Division Multiple Access (TDMA), all power supplies are controlled by the Micro Controller Unit (MCU). Each one delivers its peak power to the system load at the specified time slot. The average output power of it is still the rated value. The advantage of our method is that the feedback circuits of each power supply in parallel need not being redesigned. For stability analysis, we propose the small signal model for the architecture of multi-phase switching methods. In addition, the software component of the multi-phase switching function is constructed. The existing software package (MATLAB Simulink) together with the new component are used to verify our design on a personal computer via simulations. Aside from considering the system parameters’ chooses and the micro-program control steps, another contribution of this thesis is power saving. Because the isolated output switch, i.e. the diode, in the traditional paralleling design is replaced. The disadvantage of the diode is its forward bias causing. power loss. We use two Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) as the isolated output switch. Because there is no forward bias in our design, the power dissipation is reduced. As a result, the size of the heat sink can be reduced also. The savings of power and space are significant. We selected two power supplies of the same rated power, 240W and 240W, to obtained 480W output power by parallel connected. Also, two power supplies with different rated powers, 60W and 45W are parallel connected to obtain 105W output power. According to the software simulations and the hardware experiments, the multi-phase switching methods are feasible.

並列關鍵字

paralleling power supplies ； different rated powers ； multiphase switching methods ； reduce heat sink size ； time division multiple access

參考文獻

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應用多相切換方法以模塊化不同額定功率電源之並聯

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