本論文提出一個應用在低電壓的電壓模式控制的昇壓轉換器電路，主要是針對單顆鋰電池(2.7 V ~ 4.2 V)的電壓來昇壓至5 V。為了獲得較佳的效率，我們採用了同步整流的架構來減少導通的損失。另外電路啟動時會有過大的電流產生，而柔性啟動裝置可用來防止電路中的元件因此而損壞。當電路操作在不連續導通模式下時，由於同步整流架構中的電晶體屬於雙向導通的元件，逆電流的情形將會產生而造成能量的損耗，本文以零電流偵測裝置來改善這個情形。
本電路是以TSMC所提供的0.35μm 3.3/5 V 製造參數來設計。當模擬輸入電壓為3.6 V及輸出電流為250 mA時，整個電路的操作效率最高可到達94 %，所以適用在可攜帶電子產品的應用。

A dc-dc voltage-mode boost converter operated in low voltage applications is introduced in this thesis. The boost converter is used to convert Li-ion battery voltage (2.7 V ~ 4.2 V) to 5 V. The synchronous rectification architecture is used to reduce conduction loss and the high efficiency is obtained. At initial operation of the system, sudden current may be generated and soft start circuit is used to avoid this situation and to protect the converter system. When the converter system is operated in discontinuous conduction mode (DCM), higher reversed current will be occurred because of the bi-directional switching of the synchronous rectifier. In order to solve this problem, a zero current detector circuit is designed and power consumption is reduced. Finally, the feedback model is presented and simulated to select suitable compensation networks.
Simulation results show that the efficiency of the boost converter is 94 % with 3.6 V input voltage and 5 V / 250 mA conduction. This circuit is implemented with TSMC 0.35μm 3.3/5 V CMOS technology.

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