本論文主旨為高功率密度之全橋串聯諧振式轉換器探討與研製。由於顧慮到在高切換頻率下選用的碳化矽開關在沒有零電壓切換的情況下，可能因電路硬切產生的雜訊而影響到開關閘極電壓，導致開關誤動作讓電路損毀，所以本論文分析輸出電壓與零電壓導通的條件，並設計高切換頻率下的功率晶體、驅動電路、諧振槽、以及功率元件的散熱等需求。實驗規劃在約為300 kHz高切換頻率下輸出功率15 kW，並且探討實作時遇到的磁性元件的絞線的溫度影響。實驗結果顯示在輸出功率6 kW以上，效率皆可達到93 %以上，尤其在輸出功率高於9 kW皆能達到95 %的水準。本研究的轉換器尺寸長寬高為175  125  120 mm，操作於15 kW下，磁性元件溫度與功率晶體溫度皆能操作於容忍範圍內，功率密度可達5.7 W/cm3。

This thesis focuses on the study and implementation of a high power- density full-bridge series-resonant converter. SiC MOSFETs operated under high switching-frequency may be affected by the noise induced by hard switching, which might result in malfunction and damage the power circuit. This thesis analyzes the requirement of ZVS operation with in a range of output voltage to facilitate the selection of power MOSFET, as well as gate driver, resonant tank and heat dissipation under high-frequency condition. The experiment is proceeded to supply 15 kW at 300 kHz switching frequency and investigate the heat effect on the wire of magnetic component. The experimental result shows that efficiency is 93 % under 6 kW load, and it reaches 95 % as load increase to 9 kW. The size of the converter is 175  125  120 mm. When operated at 15 kW power output, the temperature of the magnetic component and power MOSFETs are both under a tolerable level. As a result, the power density of this converter could as high as 5.7 W/cm3.

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