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A method for the symbolic calculation of the harmonic distortion components of op-amp based memristive amplifiers is presented. The resulting fully-symbolic expressions are obtained by using an analytical model for the Hewlett-Packard memristor. The symbolic harmonic analysis allows us to provide more insight on the memristive transfer of the amplifiers. In addition, numerical evaluations are achieved...
The paper presents an original concept for interfacing of tensoresistive and capacitive force sensors with applications in modern microelectronics systems. In the first part, the authors show the results and conclusions of a PSPICE simulation for an original patented circuit. The used simulations models were introduced in some circuit components corresponding to the realistic behavior implementation...
In order to improve the robustness of fault diagnosis method based on model in the modular multilevel converter, an improved predictive model of the circulating current is established. A correction method is proposed to compensate for the uncertainties of the parameters and the measurement errors, and the disturbances are eliminated by using multi-step prediction method. The fault detection method...
Vienna rectifier is one of the most popular topologies for three-phase PFC converter. Many control schemes were presented for Vienna rectifiers with unity power factor. Because of the small phase shift θ caused by the inductor or current detection delay, a zero-crossing detection error occurs, resulting in zero-crossing current spikes. This paper presents two SVPWM methods for three phase Vienna rectifiers...
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...
Presently the choice of circuit parameters in the design of Modular Multilevel Converters (MMC) depends on iterative time-consuming simulation runs. This paper presents a method based on the Floquet-Lyapunov Theorem by which the dynamic characteristics are predicted analytically. Graphs of damping factors plotted against circuit parameters are showed by which designers will select to improve the damping...
This paper presents a design methodology with uncertainty quantification to estimate the required margin for two main design variables in a modular multilevel converter (MMC). In this methodology, the minimum required design margins are calculated by quantifying all sources of uncertainty in the modeling and simulation of MMCs. To this end, an enhanced modeling framework is presented to take into...
This paper describes the effect of MOSFET internal capacitances on the channel current during the turn-on switching transition: an intrinsic theoretical switching speed limit is found and detailed mathematically. The set of analytical equations is solved and the effect of the displacement currents is highlighted with ideal simulated waveforms. A laboratory experiment is thus performed, in order to...
For the excellent electrical performance, Gallium Nitride (GaN) new-type semiconductor devices are preferred in high voltage, high frequency and high power applications. However, GaN devices have low on-resistance and the loop layout requires low damping in high frequency loop. These both can lead to voltage and current oscillations under high frequency and even cause uncontrollable oscillations,...
LLC resonant converters are widely employed in industrial applications due to their high efficiency and power density. The design of closed-loop controllers for these converters is particularly challenging due to its non-linear behaviour and many different operating modes. The traditional linear techniques that are usually employed for this application require complex analysis or the use of empirical...
A hybrid impedance model of Islanded MicroGrid with Paralleled Inverters Controlled by Droop and PQ Strategies (IMG-PICDPS) is derived, in which the PQ-controlled Inverters (PQ-Invs) are equivalent to Norton's circuits, while the DRoop-controlled Inverters (DR-Inv) to Thevenin's circuits in this paper. An impedance-based stability analysis method is further proposed according to the Nyquist criterion...
This paper presents implementation of fault emulation method which is very important in today's chip tests on a platform with heterogeneous architecture. Nowadays, the increase in the number of transistors in electronic circuits put fault emulation method forward which is faster than fault simulation in order to obtain a test set against possible defects on chips. In this method, a hardware model...
This paper is focused on the dynamic modelling of the polycrystalline silicon wafer-based photovoltaic cells under various operational and fault conditions. The models are drawn from the impedance changes observed using electrochemical impedance spectroscopy. In this paper, tests were carried out at different voltage bias levels under illumination, dark, uniform partial shading, and cell-mismatch...
The state of charge (SOC) of Lithium-ion batteries is one of the most critical indexes for battery management system (BMS) in electric vehicles (EV) and hybrid electric vehicles (HEV). To improve SOC estimation performance and reduce chattering effect caused by conventional sliding mode observer (SMO), a novel sliding mode observer is presented in this paper. The switching gains of the proposed observer...
An inter-turn fault significantly affects the electromagnetic properties in electric machines, and its propagation may quickly lead to the shutdown of the machines within a few seconds. To build the prediction or detection techniques of the fault, a fault analysis should be carried out. Generally, most faults are analyzed by a method using negative-sequence components obtained from symmetrical coordinate...
This paper proposed an analog controller without multiplier to realize the Maximum Power Point Tracking (MPPT) for PV applications based on an improved perturbation and observation (P&O) method. Comparing with traditional analog MPPT controller designs which need a multiplier to calculate the power value to implement P&O, the proposed method only perturbs and observes single variable to get...
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...
Model-based condition monitoring for lithium-ion (Li-ion) batteries involves estimating physical model parameters and operational states such state of charge (SOC) and state of health (SOH), and is crucial for building high-performance and safety-critical battery systems. This paper proposes a real-time model-based condition monitoring algorithm based on a second-order RC electrical circuit battery...
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...
In this paper, a novel modeling method of battery pack for an optimal design and effective managements of battery is suggested. The proposed modeling method using single cell information makes an optimal design of battery pack possible by expecting the characteristics of the battery pack before the battery pack is manufactured. Also, the proposed battery pack model can be highly utilized in the battery...
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