本論文旨在研究與研製應用於低功率的脈衝轉換器，並實現電路體積扁形化。本論文選用升壓式轉換器與返馳式轉換器兩級串聯架構，前級使用限流控制升壓轉換器，先將輸入電壓提升後儲存至電容，提升之電壓在提供脈衝負載時，可大幅降低流經後級電路之電流有效值，降低感性元件體積，而先將電壓提升可改善輸出寬範圍調壓。當輸出脈衝抽載時，採用定電流控制，限制輸入電流保持額定電流大小，大部分的能量將由中間級的電容提供；定電流控制使功率級元件能以額定功率設計而非最大脈衝功率。後級使用返馳式轉換器提供兩組輸出正負壓，並利用返馳式轉換器升降壓轉換比特性達到寬範圍的輸出電壓；因返馳式轉換器的功率元件少，在低功率、多組輸出的應用上，體積較能達到最小化；將平板變壓器作為返馳式轉換器的變壓器使用，達到電路扁形化以及減小漏感，進而省去使用緩振器的電路空間。最後實作出一台直流輸入9~18V、雙組正負壓直流輸出12~220V，具有定電壓與定電流控制，額定負載11W，且能提供最大脈衝功率70.4W的脈衝轉換器。

This thesis aims to study and develop a low-power pulse converter and achieve a flat circuit. In this paper, a two-stage series architecture of boost converter and flyback converter is used. The front stage uses current limiting control boost converter and raises the low input voltage to high voltage. The high voltage can increase the storage energy of the two series intermediate capacitor. When the output pulse is pumped, the constant current control is used to limit the input current to maintain the rated current, and most of the energy will be provided by the intermediate stage capacitor; the constant current control allows the design of the power stage components to be designed only at the rated power instead of maxim-um pulse power. The rear stage uses a flyback converter to provide positive and negative voltage outputs, and uses the flyback converter voltage conversion ratio characteristics to achieve a wide range of output voltages. Because the flyback converter has fewer components, at low power or multiple output application, the volume can be minimized; and the planer transformer is used as the transformer of the flyback converter. In addition to considering the flattening of the circuit, the transformer coil arrangement design can obtain a small leakage inductance value, thereby eliminating the need for using the snubber. Finally, a DC input 9~18V, two outputs of positive and negative voltage DC 12~220V, constant voltage and constant current control, and pulse converter with a rated power 11W and maximum pulse power of 70.4W can be realized.

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