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The power transfer efficiency and coil offset degree are two key indicators in wireless charging system of electric vehicles. In order to achieve the maximum offset degree under the premise of meeting a certain transfer efficiency, an optimal design method of resonator is proposed based on real value genetic algorithm (GA). According to the Biot-Savart theorem, an algebraic mutual inductance expression...
Power Electronic Transformer(PET) is a promising component in the future power system. The PET can offer not only the functions of conventional low frequency transformer, but also many additional functions. Among all the additional functions, the reactive power control function is considered one of the most important one. This paper is discussing the application of reactive power control function...
This paper proposed a novel topology to increase the efficiency of the power amplifier applied in the microwave wireless power transmission system. The proposed topology consists of a Class Φ2 inverter in parallel with a voltage-controlled Class AB liner amplifier. The proposed topology achieves both high efficiency and high linearity, and it has the advantages of low voltage stress, small volume...
Low-frequency switching strategies are considered as an effective way of achieving efficient performance in multilevel inverters. Selective harmonic elimination (SHE) is a modulation technique of this category which gives a superior outcome suppressing low-order detrimental harmonics. Limited number of decision variables offered by SHE in the corresponding nonlinear equations hinders obtaining quality...
An improved scheme of forward converter is proposed in this paper based on the small-volume and high-power-density requirements of switching mode power supply. The converter can provide a constant magnetic resetting voltage during hold-up time interval under action of an additional circuit, which allows the converter's duty cycle to be larger than 50 percent. It helps to transfer the energy stored...
Global warming might be one of the driving forces to develop electrical drive trains due to the ability of being powered 100% renewable. However, cost reasons are still a driving issue. Referring to electrical based powertrains, they rely on two separate power nets. Here electrical power must be transferred from the electrical drive train net to the standard net. This typically is realized employing...
Large dv/dt and di/dt due to power device fast switching within a DC-fed voltage-type PWM inverter of high power density and high-efficiency motor drive system for electric vehicle (EV) always introduce unwanted high frequency noise current through parasitics/distributed parameters of the motor drive system. The complete test setup for conducted-EMI emission from the AC motor drive system of EV are...
The Light Emitting Diode (LED) based lighting technology is the latest technological innovation in the lighting industry, and it is still evolving to make it more reliable, compatible and sustainable solution. The heart of the LED lighting technology is the driver circuit, and the current driver topologies are creating significant power quality issues. This paper presents a new approach to design...
This paper first introduces an existing circulating current controller for modular multilevel converter (MMC) through redundant voltage levels with detailed analysis for the controlled circulating current. To further reduce the peak-to-peak value of the circulating current at switching frequency and decrease the total control error, a fixed-band redundant state transition principle is put forward...
Magnetic resonance wireless power transfer (WPT) in the marine environment can be employed in the charging system for underwater vehicles. Seawater submersion of a WPT system results in additional energy loss through eddy current generation. In this paper, by equating the input power to the summation of power delivered to the load, consumed by transmitter and receiver coil resistances, and consumed...
This paper presents the results of new hexagonal configuration at the T-joint of three-phase transformer core. The proposed model is compared with previous T-joint design, Butt-lap, which is widely used at present by many transformer manufacturers. The magnetic flux density distribution and core loss of a transformer rated 1000kVA are analyzed for the two types of T-joint design. The 3D simulation...
This step by step approach gives a comprehensive practical overview of important steps needed, starting on the selection of the right core material over some helpful calculations or some hints on the PCB routing, to select the best performing standard power inductors to achieve best efficiency in DC/DC-converter design.
In this paper, a new hybrid converter based of Z-source DC/DC converter with common ground is introduced. The proposed converter can supply ac and dc loads simultaneously or individually (stand-alone ac or dc loads). Also, the commutation problem of its counterpart has been solved in this topology. The proposed hybrid converter is analyzed mathematically and then validated by simulation in three different...
Aiming at the problem of load power fluctuation in the stable microgrid operation, this paper proposes a real-time power regulation scheme based on the Fast Fourier Transfer (FFT) algorithm. By FFT algorithm, load power is processed into two components of high frequency (HF) and low frequency (LF), which are absorbed to supercapacitor and battery banks, respectively. At the same time, for purpose...
Confronted with severe environment issues, large scale utilization and development of wind energy and solar energy that are regenerative, non-pollution, green and clean, the best way for power generation and grid synchronization of distributed energy is to develop intelligence micro-grid. Research should be conducted on micro-grid synchronization and isolation control strategy to ensure compliance...
A system layout for wireless charging at car parks is proposed. Communication signaling at a few 100 kHz is added to inductive power transfer (IPT) of some kW. For the power transfer a lumped parameter circuit is presented that is coupled to a three dimensional finite element analysis (FEA). This model is used for the design of couplers and appropriate resonant circuits. Likewise, the data transfer...
Advanced IGBTs need to be shut off when a short circuit occurs within less than 0.5μs as the current density of IGBTs increases. In this paper, a circuit design and the measurement results are described for an IC chip which enables the short-circuit detection within 20-ns. The circuit detects the short-circuit condition by checking the existence of a plateau in a gate drive waveform. The proposed...
Multi-modular active power filter has advantages in compensating harmonic current, which results from its controllability and dynamic response performance. However, to realize a reliable and high-precision harmonic compensation system, current control and dynamic coordination strategy need to be optimized. In this paper, centralized current loop is optimized with amplitude and phase correction based...
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