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An accurate circuit and device model is a valuable tool for developing new topologies, building successful designs, and shortening time to market. The input, output, and reverse transfer capacitance of power MOSFET are of vital importance to the MOSFET as they determine the dynamic behavior of the device during switching transients. In this study, the static characteristics of a specific GaN device...
In this paper, splitting of peak switch voltage by series connected transistors in the class E inverter is proposed. In this method, peak switch voltage of class E inverter is reduced to half of conventional because shunt capacitor voltage is divided by two switches. Key feature of this method is that drive signal source of each switch can be grounded. Namely, transformer is not required in this method...
This paper analyses the parameter dependence during the charging process of a Vanadium Redox Flow Battery (VRB) for a system-aware green data center which has distributed sources of energy production and amenable to flexible load scheduling. One of the key features of a flow battery is the ability to control the flow rate and current during the charging process. The flexibility however has a direct...
In power electronics, Power Hardware-in-the-loop Simulation (PHILS) which consists of Hardware part and Digital Simulator part has attracted attention. This is the very useful tool to shorten development time and to simplify verification under complicated condition. However, it is known that instability is caused by the time delay between Digital Simulator and Hardware. This paper applies two methods...
This paper presents a current sensor-less boundary current mode PFC converter. In particular, the ac-dc converter with a boundary current mode control has the following several advantages. One is that it has the capability to achieve the low input current distortion and the unity power factor can be obtained in theory. Another is that it is possible to reduce the switching loss because the inductor...
In recent years, there is growing interest in improving lithium-ion battery state monitoring. This is due to growing concern over ensuring reliable and safe operation of lithium-ion based energy storage system especially in automotive and stationary e.g. UPS in data center applications. In this paper, battery state of charge estimation based on Extended Kalman Filter (EKF) and improved battery model...
The power conditioning system (PCS) is widely used as a grid connected inverter to keep output constant. A novel power conditioning system (PCS) using a circuit of modular multi-level converter (MMC) construction is investigated. The feature of the system is that output voltage becomes multilevel for low distortion and circuit has an energy storage system such as a battery or an electric double layer...
The purpose of this paper is to discuss a current prediction algorithm for sensorless model control dc-dc converter. In the proposed method, the sensing resistor for the current detection is eliminated by predicting the output current. The output current is predicted from the equation of the relationship between the output and input voltage in the static state using the duty ratio and the output voltage...
An electrical vehicle charging station is a charging power supply for electrical vehicles. This paper proposes design of a model for a PV based electrical vehicle that forecasts total power output under particular conditions of Ankara city. First PV cell parameters are determined and then PV array formed including cells designed in order to calculate cumulative effect. Using actual irradiation and...
Renewable energy system such as a photovoltaic, a wind turbine generation and fuel cell has attracted attention as alternative energy sources of fossil fuel. However, a distributed generating system with the photovoltaic or the wind turbine generation is difficult to obtain a constant power supply. Thus control of power leveling system is required to maintain the balance of power flow for irregular...
This paper proposes a simple circuit model to estimate output voltage fluctuation in paralleled converter system with optimized on-off control. The optimized on-off control method changes the number of active converter modules to minimize power losses in paralleled system according to load current. However, it causes voltage fluctuation in transient response. Output voltage fluctuation due to the...
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