2016 Ministry of Science and Technology Research Project (PI)

Topic—Design and Implementation for High Power Density Power Factor Correction Converters using Wide Bandgap Devices

Abstract—This project is expected to achieve a high efficiency, high power factor, high power density and low input current harmonic PFC. There are two primary methods to reach high efficiency. First, analyze each topology’s pros and cons by simulation and calculation. Second, the selection of power devices. Due to the fast switching property of Wide Band-gap (WBG) Power Semiconductor Devices, it can reduce the loss and improve conversion efficiency, therefore increase the total power density. To realize high PF and low harmonic, we choose to use digital control; this can reduce harmonic distortion and improve PF at a variety of input voltage and load conditions. Also by the selected circuit and control method, using lower capacitance while meeting holds up time and voltage ripple requirements. Our preliminary planning work will include simulation to evaluate and verify our proposed designs. In consideration of high power density, mechanical parts and heat transfer are also key points in this competition. Through the early stage loss analysis, we can evaluate whether the temperature rise of our design is within specifications. By the designing of mechanical parts, we can use space efficiently to optimize heat transfer. Finally, we will develop and implement a high-performance prototype that will meet all specifications for the competition with an integrated design of thermal, mechanical and electrical parts. For this project, we expected to implement a universal power factor corrector converter, at an input voltage of 115 Vac, and 50% load, the efficiency will higher than 95%; At an input voltage of 230 Vac and 50% load, the efficiency will greater than 98%; The current harmonic at an input voltage of 115 Vac and 50%, 100% load are 2% respectively. The power density is higher than 1W/cm3.

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