本論文旨在研究應用於寬輸入電壓範圍電源轉換器，一般常見單級型寬輸入電源轉換器，其受限於開關導通比，而串級型則會受到效率及功率密度限制，故本文使用非反相同步四開關升降壓轉換器，解決單級型轉換器開關導通比問題，並利用加入兩組輔助電路在該轉換器架構，使電路達成零電壓切換，提升整體轉換器效率。文中對於該轉換器進行動作原理與功率開關損耗的分析，探討轉換器在加入兩組輔助電路後，轉換器可以在不同負載下實現ZVS，而不會增加功率開關上之電壓應力，因此可以最小化功率開關損耗，最後利用LTspice電路模擬軟體進行電路模擬，實作驗證轉換器在直流輸入電壓20-80 V，輸出功率為100 W，輸出規格為48 V/2.08 A，效率有明顯的提升，整體電路最高效率為97.9%。

The purpose of this thesis is to study the application of wide input voltage range power converters. Generally, single stage wide input power converters are common, which are limited by the duty cycle. Furthermore, the cascade type is limited by efficiency and power density. Therefore, using a non-inverting synchronous four-switch buck-boost converter is to solve the problem of the duty cycle of the single stage converter. By adding two sets of auxiliary circuits in the converter to achieve zero voltage switching of the circuit and improve the efficiency of the overall converter. This article analyzes the operating principle and switching loss of the converter. It is discussed that after adding two sets of auxiliary circuits to the converter, the converter can achieve ZVS under different loads without increasing the voltage stress on the power switch. Consequently, the power switching loss can be minimized. By using LTspice circuit simulation software, the implementation verifies that the efficiency is significantly improved with the specification of a DC input voltage of 20-80 V, an output power of 100 W, and an output specification of 48 V/2.08 A. The maximum efficiency of the overall circuit is 97.9%.

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