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In this paper, a novel smart fast charging system is proposed to meet various types of charging needs. Based on the modular design principle, the system can be flexibly configured according to the number of electric vehicles and charging power needs, and the configuration is carried out in the use of the charging station. A power distribution unit based on a power electronic device rather than a switch...
Electrolytic capacitors are widely applied because of low volume and cost, however their lifetime is quite limited typically less than 10000h. An improved control strategy for PFC converters with small storage capacitance suitable for medium and high power is proposed on the basis of conventional ACM PFC, which effectively eliminates third harmonic input current due to the low energy-storage capacitance...
An improved Totem-pole bridgeless boost rectifier with low conduction losses and zero diode reverse-recovery is proposed for power-factor correction (PFC). Compared to the traditional totem-pole bridgeless boost rectifier, the proposed boost rectifier reduces the conduction losses by using complementary PWM driving and eliminate the diode reverse-recovery problems by an additional Silicon Carbide...
The output air volume of a fan motor will be different and not a constant value all the time when the fan motor works. There are mainly two aspect reasons. On one hand, for one given fan motor, the pipeline resistance will change because of the clogging of the filter and other reasons. On the other hand, for different fan motors, the motor efficiencies are not the same. The paper presents a constant...
The paper firstly points out that there are bifurcations on both slow scale and fast scale in Dual Boost PFC in mode of average current control. In terms of slow-scale bifurcation, the nonlinear model of the circuit is derived based on the state space averaging method. The different slow-scale bifurcation behaviors were predicted by the numerical calculation. The further analysis shows there are different...
A mathematical model of grinding roughness for spiral bevel gears is proposed. The model considers two sources that contribute to the roughness, (i) material removal, and (ii) the discretized generating movement between the grinding wheel and the workpiece. For source (i), the classical roughness model for general orthogonal grinding is adopted, for which the grinding process of spiral bevel gears...
This paper proposed the novel Z-Source PWM rectifier-inverter which has the following advantages: the lower dc voltage on Z-Source capacitor, the reduced volume of capacitor and the simplified mechanical structures. Meanwhile the system is one stage and the efficiency is high. This paper studies the two kinds of Z-Source rectifier-inverter SVPWM method. In order to decrease the switching loss and...
To reduce the switching loss of traditional hard-switching PWM converter, in this paper, putting a new-type limited double poled ZVS control scheme and its implementation method in full bridge PWM converter. This new-type control scheme may reduce the number of the power supply of driving circuit. In the main circuit, by adopting the methods of blocking condenser and the resonant inductor, making...
There is an urgent need to replace the DC-link electrolytic capacitors in electrical vehicle charging power supply by non-electrolytic capacitors. This paper proposes two methods to solve the problem. The first one is to improve the circuit topology, the other is to optimize system parameters. At last, both simulation by SABER and experiments validate the points.
With the development and popularization of Electric Vehicle, the Electric vehicle charging systems are more and more important. This paper proposed the novel Z-Source rectifier-inverter for electric charging station. The Serial-Z-Network makes the shoot-through zero state possible, which regulates the output DC voltage. This paper includes the topology analysis, the control strategy and the PWM control...
Face to energy crisis and increasingly severe pressure on environmental pollution, electric vehicles have become the new direction of the vehicles. In order to meet the electric vehicle's charging requirements for high power factor (PF), this paper intends to implement single- switch active power factor correction (APFC) function under the control of voltage, current dual closed-loop in Inductor current...
Popularization of charging station promotes wide applications of electric vehicle (EV). With the increase in the number of charging station, the problem of grid pollution becomes worse and worse. To improve the utilization rate of EV, the charging hours must be decreased. At present, most EVs start charging instantaneously under almost rated power of the charger. Large-scale EVs charging without adjustment...
The number and variety of EVs batteries connected to grid continue to grow rapidly, which result in a heavy burden on grid. To solve this problem, it was proposed that electric vehicles could act as a new power source for grid, which is the concept of Vehicle to Grid (V2G). This paper proposed the photovoltaic charging station architecture by using a combination of the Z-source boost converter based...
Widely applications of electric vehicle rely on popularization of charging station. With the increase in the number of charging station, the problem of grid pollution becomes worse and worse, and the charging hours must be decreased to raise the utilization rate of electric vehicle. This article proposes a novel unit power factor DC fast charger for electric vehicle charging stations. This DC fast...
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