دانلود رایگان مقاله انگلیسی یک مبدل جدید DC-DC سه سطحی با خروجی دوگانه و ورودی تکی - 2018 IEEE

Abstract

This paper proposes a novel non-isolated single-input dual-output three-level dc-dc converter (SIDO-TLC) appropriate for medium and high voltage applications. The SIDO-TLC is an integration of the threelevel buck and boost converters, whose output voltages are regulated simultaneously. Reducing voltage stress across semiconductor devices, improving efficiency, and reducing inductors size are among the main merits of the new topology. Moreover, due to the considerably reduced volume of the step-down filter capacitor, a small film capacitor can be used instead, whose advantages are lower ESR and a longer lifespan. A closed-loop control system has been designed based on a small-signal model derivation in order to regulate the output voltages along with the capacitors’ voltage balancing. In order to verify the theoretical and simulation results, a 300 W prototype was built and experimented. The results prove the aforementioned advantages of the SIDO-TLC, and the high effectiveness of the balancing control strategy. Furthermore, the converter shows very good stability, even under simultaneous step changes of the loads and input voltage.

V. CONCLUSION

This paper proposed a high-efficiency non-isolated SIDO-TLC, whose outputs are boost and buck simultaneously. Owing to the converter’s three-level control and structure, the voltage stress across the semiconductor devices is only half as much as the boost output voltage. Also, the size of the inductors shrank, and the step-down terminal’s capacitor volume was reduced so dramatically that a small 4.5 uF film capacitor was used in the experimental prototype. The results showed that the proposed converter was well stable under dynamic changes. Meanwhile, the converter’s two split series capacitors at the step-up terminal and also its highly effective balancing control makes it attractive for applications such as the three-level diode clamped inverters in which the dc link capacitors voltage balancing is of great importance.