Efficiency Of Power Conversion Systems Research Articles

Análisis de la eficiencia de los sistemas de conversión de energía eléctrica en vehículos eléctricos

The study explores advances in the efficiency of power conversion systems in electric vehicles (EVs), a crucial aspect to optimize their performance and range. Through a qualitative literature review, DC-DC converters, DC-AC inverters and fast charging systems are examined, highlighting the impact of advanced materials such as silicon carbide (SiC) and gallium nitride (GaN) on energy efficiency. The findings suggest that the use of these materials reduces thermal losses and enables higher power density, benefiting the autonomy of EVs. In addition, it emphasizes the importance of thermal management and advanced control algorithms to optimize power flow and extend component lifetime. It concludes that innovations in semiconductors, together with the implementation of thermal management and control techniques, are key to increasing the viability and competitiveness of EVs in the global market. However, challenges remain, such as the high cost of materials and the need to develop an adequate charging infrastructure for mass adoption.

Exploring Gallium Nitride as a Viable Replacement for High Power and Performance Semiconductors: A Comparative Study of Electrical Properties and Fabrication Techniques

The semiconductor industry is continuously seeking to develop more compact, faster, and less expensive transistors allowing for more power to be packed into the same chip. This requires the development of smaller and more efficient semiconductors that are currently in the range of around 5-7 nanometers each. However, the limitations of silicon, the leading semiconductor material, are becoming more apparent, prompting exploration of other compounds, with a very promising candidate being gallium nitride (GaN). This paper presents an overview of GaN-based high electron mobility transistors (HEMTs) and integrated circuits (ICs), which offer several advantages over silicon-based counterparts. GaN HEMTs have lower on-resistance, faster devices, less capacitance, and less power consumption allowing them to sustain higher voltages and faster current. Meanwhile, GaN-based ICs have the potential to improve the efficiency of power conversion systems and circuits due to their ability to integrate both power-level and signal-level devices on the same wafer. With GaN-based devices, power conversion can become more efficient and cost-effective, ushering a new era for power conversion.

Characteristic of a Variable Inductor Using Magnetorheological Fluid for Efficient Power Conversion

This paper proposes a new variable inductor for efficient power conversion which consists of the ferrite core and the gap filled with a magnetorheological fluid. Its main feature is to show a large inductance variation versus inductor currents even with a simple inductor structure and so it leads to improving light and intermediate load efficiency of power conversion systems compared with the conventional inductor with an air gap. To predict the characteristics of the variable inductor, the nonlinear magnetic permeability of the magnetorheological fluid used is accurately measured because the inductance value strongly depends on the magnetic nonlinearity of the fluid. With the obtained B-H curve, a 1 kVA variable inductor is designed and analyzed with three-dimensional finite element method taking into account the losses of the core and the fluid. Finally, to prove the feasibility and usefulness of the proposed inductor, a prototype inductor is fabricated and its experimental results are compared with numerical ones.

태양광 발전 시스템을 위한 부스트 컨버터의 회로 구성에 따른 직류측 스위치 손실 분석

Switch losses directly affect the efficiency of power conversion systems and those have big differences according to the power consumed by load systems and the structures of power conversion circuits. In this paper, analyses for switch losses in DC link converter are performed based on the circuit structures of the DC/DC converter in photovoltaic generation system whose output power is varied according to the amount of solar radiation, temperature and partial shade on the solar modules. Boost converter is adopted as a DC link converter topology of the photovoltaic generation system and the loss analyses for the switches used in the boost converters are performed according to the circuit structures. Analyses like the things performed in this paper will be a prerequisite to designing the photovoltaic generation system whose output power is changed according to the environmental variations.