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A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary...
A novel Medium Voltage Direct Current (MVDC) circuit breaker consisting of a High-Speed Switch(HSS) and a bridge-type commutation branch, which is based on current injection, is proposed and analyzed in this paper. The commutation branch of this design adopts bridge type, which can break bidirectional fault current rapidly by controlling thyristors. Meanwhile, after fault current is commutated to...
A novel tunable frequency selective surface is presented in this paper. The FSS is composed of two stacked metallic layers. By loading different capacitance or inductance, resonant frequency can be easily changed. The simulation results show that when the capacitance is loaded, the resonant frequency can be decreased from 5.8 GHz to 4.7 GHz when the capacitance is increased from 0.1pf to 0.3pf. When...
This paper presents different experimental methods for measuring parasitic capacitances and inductances of direct copper bond (DBC) based power semiconductor modules. The found parasitics are compared with finite element simulations to evaluate their accuracy. A very good match of the simulated and measured stray capacitances is found. The parasitics, which are found via simulations and experiments,...
Model predictive control is a kind of control method based on parameter model. However, in the actual system, the parameters of the motor may deviate from the parameters in the model due to the influence of various objective factors, leading to deterioration of the control performance. In this paper, a strong parameters robustness model predictive current control (MPCC) method for permanent-magnet...
In this paper, an electronically tunable immitance circuit is proposed. The presented circuit can be configured as a tunable grounded inductor or capacitor multiplier. The proposed circuit employs a single active element called Voltage Differential Current Conveyor, a single resistor and a single capacitor. The presented circuit does not require element matching constraints. It is linearly tunable...
The mathematical models under three different coordinates are set up respectively of double Y shift 30° PMSM series-connected system supplied by single inverter with embed rotor and sine-waveform MMF distribution. The vector control model of series-connected system based on id=0 control strategy is presented. The simulation with variable load is proposed to realize the decouple control of this series-connected...
The output voltage of SEPIC can be greater, less or equal to its input voltage, and respond more gracefully to short- circuit output. Working process of SEPIC working in discontinuous conduction mode (DCM) was analyzed in detail. The parameter calculation method of SEPIC is also given. The relationship between duty ratio and output voltage of SEPIC working in continuous conduction mode (CCM) and DCM...
Multipole field electromagnetic launcher (MFEL) is a new type of coilgun that can produce larger radial magnetic field compared to the axial magnetic field, the axial acceleration force of coilgun mainly come from radial magnetic field. Because of the similarity of the magnetic fields between inner and outer regions of MFEL, this paper proposed a double-armature MFEL. One armature coaxial with the...
This paper presents the issue of the control units used for tuning of Petersen coil. Utilization of specific algorithm is given by certain application assumptions. Generally, it is possible to say that all algorithms can contribute to reducing of the fault current size. The size of the fault current is different depending on the adverse effects and the algorithm used. This also influences the time...
This paper proposes LED current control method of dimmable LED driver with dual active bridge (DAB) DC-DC converter for 1kW-class LED floodlight. The LED current control method is discussed in detail. The conventional LED driver cannot control turn-off time of LED current because the power flows from source side to LED floodlight side only. DAB converter is a bidirectional DC-DC converter formed by...
Power electronic applications need high voltage and current ranges which are impossible to obtain with discrete devices. Parallelization technique is a solution to increase power converter current capacity. Current distribution problems may reduce device lifetime and cause converter malfunction. Parallelization requires a total control of circuit parasitic elements which depend on layout physical...
In present work is carried out modelling of single transistor parallel ZVS DC-DC converter. Main advantage of power circuit is direct work in steady mode. Thus, that allows avoiding a starting procedure and guarantees reliable operation in significant major change in load occur. The model is realised with Matlab. Computer simulations and experiments in lab model are performed by which the model is...
For wireless power transfer (WPT) systems transferring high power, both high efficiency and low magnetic field leakage have been regarded as the main design objectives to be achieved. For the first time, in this paper, we propose a new concept of hybrid loop-array structure and its design procedure to achieve high efficiency and low magnetic field leakage simultaneously in high-power WPT system. The...
An LC3L type Isolated bidirectional dc/dc converter is analyzed, including the effect of a high frequency transformer by using ac complex circuit approximation. Its solution is derived and is used to obtain the characteristics of the proposed converter. The analyses show the comparison of voltage gain with T-equivalent transformer results in introduction of magnetizing and leakage inductance at conventional...
Due to the increasing energy demand there is a need of energy storage and advanced power conversion system. Energy which are available from the renewable energy sources can be efficiently store and can be convert to feed load as per the requirement. There are some power quality issues or poor voltage regulation where the load is supplied by renewable energy source. Therefore it is required to design...
In this work, a metamaterial resonator based on complementary split ring resonator (CSRR) loaded with square open-loop resonator (OLR) is presented theoretically and experimentally. It is shown through equivalent circuit model that the addition of OLR to the conventional CSRR-loaded cell generates transmission zero in the upper stop band and improves the upper band rejection level without increasing...
The concept of energy harvesting has been widely accepted as future necessity for the society, accelerating its transition to the environment of the so-called green technologies. The energy harvesting approaches in various domains of human surroundings have been considered, among them those related to the energy of ambient electromagnetic field (EMF). In this early research paper, the inductor with...
A new class of nuclear quadrupole resonance (NQR) detector based on non-Foster circuits (NFCs) is introduced. NQR is a solid-state radio frequency spectroscopic technique, allowing the detection of different substances based on their spectral profiles. Recently, non-Foster circuits have received significant interest for broadband impedance matching of small antennas; this principle will be used to...
The grating eddy current sensor is based on the principle of lateral eddy current. Its precision is greatly influenced by the coil and reflector parameters. It is important to analyze and optimize those parameters so as to improve the precision. Therefore, it is necessary to make further research on how the sensor nonlinear error is influenced by parameters, such as reflector size, shape and coil...
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