近年來，消費性電子元件需求大增。為了這些消費性電子元件供電須具備升壓及降壓功能的直流轉換器。本論文將提出一具多模態控制高頻四開關直流升降壓轉換器。在論文中，將基於峰值電流控制方法，開發具有多模態切換的控制方法。以及使用氮化鎵開關，進而提高轉換器工作頻率，以降低磁性元件體積。在本文會提出一多模態控制方法，其在負載為輕載條件下，會將電路控制方式切換為PFM控制，以提高輕載效率。在PFM控制下，升壓模式效率在1%負載下可由35.56%改善為70.11%。降壓模式效率在5%負載下可由53.53%改善為67.01%。反之，負載條件為滿載時，電路控制方式將切換為PWM控制。在PWM控制下，升壓模式效率最高可達91.69%。在降壓模式效率最高可達92.93%。此外，本文以數位類比混合式控制方式，使轉換器能達成模態間自行切換，並且使動態負載響應能小於5%。藉由理論推導及實作一輸入電壓為10V、輸出電壓為5V及20V、輸出功率為10W及100W、操作頻率為500kHz的升降壓轉換器來驗證架構及控制之可行性。

In recent years, the demand for consumer electronic components has increased dramatically. In order to supply power to these consumer electronic components, a DC converter with step-up and step-down functions is required. This thesis will propose a multi-mode control high-frequency four-switches step-up/down converter. Based on the peak current control strategy with multi-mode switching will be developed. Using the GaN switches to increase the operating frequency, the volume of magnetic component is reduced. For improving the light load efficiency, the PWM and PFM control strategy will be combined. Under PFM control, the step-up mode efficiency can be improved from 35.56% to 70.11% under 1% load. In the step-down mode, the efficiency can be improved from 53.53% to 67.01% under 5% load. Conversely, when the load condition is heavy, the control mode will be switched to PWM control. Under PWM control, the step-up mode efficiency up to 91.69%. In the step-down mode, the efficiency up to 92.93%. In addition, this thesis uses digital-analog hybrid control strategy to enable the converter to automatically switch between modes and the dynamic load response to be less than 5%. By theoretically deriving and implementing. A step-up/down converter with an input voltage of 10V, an output voltage of 5V and 20V, an output power of 10W and 100W, and operating frequency of 500kHz will verify the feasibility of its architecture and control.

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