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With the increase of operating frequencies of switching devices, the size and weight of power converters are reduced. However, the impact of parasitic parameters becomes significant, which affects the performance of power converters. Compared with a simple equivalent circuit of filtering inductors, a detailed lumped circuit model is more suitable for the study of the behaviour of the inductor at high...
In a magnetically coupled resonant (MCR) wireless power transfer (WPT) system, adding repeating coils is an effective way to lengthen transmission distance and improve the transferred power in a wide range. This paper investigated a 3-coil MCR WPT system. Based on fundamental harmonic analysis on the equivalent circuit model, the relationship between the transmission characteristics and the spatial...
An accurate modeling method for electric parameters prediction of CSR (Contactless Slip Ring) is proposed in this paper. Parameters of CSR can be conveniently obtained before simulation and prototype design. In order to increase the accuracy of the predicted electric parameters, the main flux are corrected by taking the partially coupled flux into account, and the leakage inductance is obtained by...
SiC-MOSFETs have attracting increasing attention because of their outstanding characteristics that contributes to high efficiency and high power density of power converters. However, compared to conventional Si-IGBTs, SiC-MOSFETs are susceptible to false triggering, because they tend to generate large switching noise due to ultrafast switching capability and have a lower threshold voltage in high...
Multi-phase magnetically coupled resonant (MCR) wireless power transfer (WPT) technology, which can effectively reduce the limits of coils spatial locations on power transfer, has become one of the most promising technologies in the mid-range applications. In this paper, a three-phase MCR WPT system was investigated and the equivalent circuit model was built and simplified. Based on the theoretical...
Multi-modular converters have proven to be one of the most suitable topology to be used in high and power applications. The modularity of these configurations offer several advantages, such as: high quality voltage, redundancy and high efficiency. In these converters, the series connection of modules increase the number of voltage levels, but also the floating voltage of modules with respect the neutral...
In this paper, a novel liquid metal current limiter (LMCL) is proposed allowing for the large rated current and considerable fault current energy dissipation in DC power system. According to this topology, the LMCL consists of a fast switch and several liquid metal current limiting units in parallel. Firstly, a simulation model of this LMCL is built to calculate the fault current commutation process...
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...
The transient interruption characteristics and reignition conditions of direct-current (DC) forced current zero for vacuum interrupters in 270 V power-supply systems are discussed. Three stages are identified in forced interruption: DC arcing stage, current commutation stage, and voltage recovery stage. During the current commutation stage, the reverse peak current coefficient k, which is a key design...
This paper presents a novel procedure to determine the internal gate-source voltage inside a multi-chip power module using the example of a SiC half bridge module. Based on the lumped elements of the gate circuit calculated by a quasi-static electromagnetic simulation, each field-effect transistor is represented by a single, voltage dependent capacitor. The procedure is validated by clamped inductive...
Due to the structural design of the traditional matrix converter, the voltage transfer ratio is limited to 0.866. In this paper, we purposed a new one-step boost type matrix converter, which can change the voltage transfer ratio variable from the perspective of changing the topological structure. The topological structure of one-step boost type matrix converter not only improved the voltage transfer...
In this paper, the circuit model of 1000A/75mV shunt was calculated based on field-circuit coupling method by designing an interactive computer program between numerical analysis in MATLAB and finite element analysis in ANSYS. The calculate results provide the basis to analyzing measurement results when measuring transient current or alternating current with shunt.
Grid connected inverters with LCL output filters are widely used in exporting energy generated from renewable energy sources. The LCL filter and inductors used in this filter has important effect on inverter performance. Although it is different in high power levels nowadays, powder cores are commonly used in inductor design in low and medium power levels. In this study, inductors for LCL filter of...
Interconnect design has recently become one of the important factors that affect the circuit delay and performance especially in the deep submicron technology. The modelling of interconnects is typically based on using Elmore definitions of the delay time and rise time. So, a general formula for Elmore delay time and rise time in the fractional order domain are presented in this work. It is found...
The paper reports a methodologie approach to analyze a new layout of 3 kV DC railway substation. An evaluation about the substations' (ESSs) filter, in order to reduce the reactor encumbrance has been carried out. By means of simulations with different filter configurations, the proposed approach allows to verify that the harmonic content of the released current in the return circuit is compatible...
This paper presents a comparison of two identical gallium nitride (GaN) cascode transistors with different TO-220 packaging configurations. The transistors were analyzed using a precision frequency domain impedance analyzer; and lumped, per-terminal estimates were developed for the parasitic package inductance of each device. It was found that the devices have different per-terminal lead inductances,...
Electric model based in the duality between the electric and magnetic circuit taking into account the misalignment characteristic of transformer of a Wireless Power Transfer, WPT, is proposed. Being a model based in the constructive characteristic of the transformer the model, it represents better the misalignment effect and the simulation values are more accurate in comparison with the T model that...
This paper focuses on the modeling and analysis of different power distribution network (PDN) structures in 3D TSV ICs, including 3D full wave model and equivalent circuit model. In addition, a simplified equivalent circuit model of stacked PDN is proposed to analysis aspects influencing stacked PDN impedance, such as number of ground TSVs, number of TSV pairs and number of stacked layers. Analyses...
Recent computing systems consume more than several hundred watts of power and a robust PDN design is critical to minimize power/ground (P/G) voltage fluctuation and get stable performance. In most cases, the IC package (PKG) PDN determines mid-frequency P/G noise characteristics. The PDN of our target IC package consists of more than ten thousands staggered microvias and tens of layers, representing...
Cavity model is one of the key computational models for power distribution network simulation. However, the conventional cavity model assumes uniform current distribution along the via and its accuracy is limited to the coupling of close-placed vias. This paper presents an improved cavity model based with gradient current distribution assumption. The loop inductance and surface current distribution...
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