本論文提出了一交錯式三相單端初級電感轉換器（SEPIC Converter）之電路，該電路可應用於寬範圍輸入與固定輸出電壓與電流之小型光源驅動電路。本論文提出之電路將原本SEPIC電路之輸出蕭特基二極體替換成功率開關元件，加入死區時間(Dead Time)使功率開關以互補方式動作且具有零電壓切換，因單一級電路之輸入電流的漣波會隨著輸入電壓提高而變大使電路在設計各元件時因受限制無法使體積縮小，且電路操作於三角電流模式。因此本論文加入交錯式方式，為三組的主功率級電路並聯，可稱為三相交錯式，因並聯而使各相的電流分流，操作頻率提高，元件大小可縮小，電路體積亦可縮小。而控制部分使用數位控制方式，最後，實施了一個樣機以展示在10-40 V直流輸入電壓範圍內的可行性。直流輸出為12 V / 1 A / 12 W。

This thesis proposed a circuit for an interleaved three-phase single-ended primary inductor converter (SEPIC Converter) that can be applied to a wide range of input and fixed output voltage and current small light source drive circuits. The circuit proposed in this paper replaces the success rate switching component with the output Schottky diode of the original SEPIC circuit and adds the Dead Time The power switch operates in a complementary manner and has zero voltage switching, because the ripple of the input current of a single-stage circuit will change as the input voltage increases, and the circuit cannot be reduced due to limitations in the design of each component, and the circuit operates in triangular current mode. Therefore, this paper adds a staggered method, which is a parallel connection of three sets of main power stage circuits, which can be called three-phase interleaved, due to parallel connection, the current of each phase is shunted, the operating frequency is increased, the component size can be reduced, and the circuit volume can be reduced. The control section uses digital control, and finally, a prototype is implemented to demonstrate feasibility in the 10-40 V DC input voltage range. The DC output is 12 V / 1 A / 12 W.

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