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This paper presents on overview on the microwave small-signal modelling for the GaN HEMT technology. The two approaches contrasted here are: the standard modelling approach based on the equivalent-circuit representation and the behavioural modelling approach based on artificial neural networks. These two approaches are applied to a GaN HEMT device working in a wide range of biases and at different...
Thermal models for simulating heating and cooling of PIN diode and FET-based MRI coil blocking circuits are presented. The temperature dependent parameters in the two basic circuit elements as well as the related SPICE-compatible circuit models are discussed. Impedance versus temperature measurements for both PIN diode and MOSFET are presented that confirm the validity of model usage. A MRI coil blocking...
We present a simple small-signal parameterized equivalent circuit for HgCdTe photodetectors operating at high temperatures in the middle and long wavelength of the infrared spectrum. This circuit is capable of accurate modeling the impedance of these devices upon bandwidth of several GHz and for a wide range of bias voltage and temperatures. We have implemented this model as a parameterized sub-circuit...
Development of distributed power systems with photovoltaic (PV) panels and storage batteries has become very active. Since the generated power by PV panel is unstable, development of an intelligent and efficient charging system is strongly demanded. Also, the distributed systems are optimized by co-operating by each node. Thus, inexpensive and quickly responding PV emulation system is effective to...
This paper presents an organic light-emitting diode (OLED) equivalent circuit model with a temperature coefficient and an intrinsic capacitor. In order to precisely describe the OLED nonlinear $V\!\!{-}\!I$ characteristic at different ambient temperatures, four parameters, i.e., the maximum operating point, the rated operating point, the knee point, and the temperature coefficient, are obtained from...
In this paper a small-signal and noise transistor model with the associated extraction procedure is proposed. The model is based on an equivalent circuit, extracted from electromagnetic simulations and noise measurements using an automatic analytical procedure. This identification procedure ensures high robustness to layout modifications, making the model suitable for low-noise amplifier design. An...
Lithium batteries are key solutions for sustainable energies storage and particularly interesting for green transportation. Vehicle manufacturers are making a clear transition to a more efficient and ecofriendly transport. In fact, Battery Management Systems (BMS) are crucial for a safe and optimized use of these energy storage systems. This article presents an accurate dynamic electro-thermal model...
The aim of this paper is to analyze and compare two artificial neural network based approaches for parameter extractions of microwave transistor equivalent circuits including noise. In the first approach equivalent circuit parameters are determined from the operating conditions, whereas in the second approach equivalent circuit parameters are determined directly from the measured scattering and noise...
A novel nonlinear high-power Gallium Nitride (GaN) High Electron-Mobility Transistor (HEMT) equivalent circuit model is described. Features of the model include a nonlinear thermal subnetwork extracted using straightforward measurement techniques, and a modified Angelov/Chalmers single function drain current equation. The model can very accurately predict the Pulsed IV (PIV) curves at different pulse...
In this paper the performances of photovoltaic (PV) panels has been analysed, for different connections of PV cells, by using the four-terminal theory and Brune's conditions of circuit interconnection. A LabView and Matlab applications have been implemented to prove the theoretical models and to obtain the equivalent parameters of PV cells' connections. The examples presented have shown the comparisons...
According to the impedance characteristic curves of linear regulator chip which are measured in different temperatures, making use of chip model and the determination of LSI/IC equivalent model parameter, the resistance, capacitance and inductance parameters of chips in different temperatures are obtained. And the fitted impedance characteristic curves of chips by vector fitting are obtained. By the...
This paper presents onboard capacity estimation algorithms for Li-ion batteries deployed in plug-in hybrid electric vehicles (PHEV) and electric vehicles (EV). Capacity estimation algorithms are developed based on an equivalent circuit model. The onboard estimation of battery capacity is treated separately for the driving mode and plug-in charge mode. Evaluation results on laboratory collected data...
Due to increasing integration densities and the emergence of nanotechnology, especially reliability and power related design aspects become critical for chip design. Since the arising problems are enforced by high circuit temperatures, the need for a possibility to model thermal behavior of a system in an accurate and physically correct way becomes inevitable. Hence, in this paper VulcaNoCs, a SystemC-based...
There is a problem peculiar to photovoltaic (PV) generation systems that output power changes with weather conditions. The paper describes a PV generation system with high reliability which can always stably supply clean electric power to loads. The stabilization of the PV generation system is realized here by compensating the generated electric power, which changes with weather, in cooperation with...
This paper discusses the problem of determining a thermal model of an electronic system based on the spectral analysis of its step temperature response. The proposed method yields equivalent RC Cauer ladder thermal models, which consist of only a few RC stages, but produce very accurate estimates of circuit temperature. Moreover, the values of model elements have physical significance. Such a thermal...
This paper presents the results obtained testing a tool designed to characterize and simulate the behavior of a Photovoltaic (PV) panel under real and/or simulated working conditions. The presented tool permits the continuous monitoring of the I-V (Current-Voltage) and P-V (Power-Voltage) characteristics of the panel and the comparison between actual and expected performance; in this way it is possible...
Recently, fuel cells prevail around the world. A fuel cell emulator is needed when we design a power converter system including fuel cells. A new emulator which consist of two types of electrical circuits, a software controlled power source based on a Model A and a hardware circuit based on a Model B, is studied in this paper. The Model A emulates the steady-state characteristics and the Model B emulates...
This paper proposes a black box approach which synthesizes lumped circuit model of the Foster type for a frequency-dependent characteristic element by the least squares method systematically. However there are two numerical difficulties to model them. One is the numerical stability problem which comes from limitation of effective numerical digits of data especially for wide frequency band ranges....
The recent advancement on niobium nitride (NbN) superconducting nanowire single photon detectors (SNSPDs) have drawn considerable attentions by many of their particular figures of merit. In this work, we report our experimental efforts resulting from combinations of dc, RF/microwave and optoelectronic characterizations of this device. The dc IV measurement is under-taken in the full voltage bias range...
Results of Frequency Domain Spectroscopy measurements are known to be largely influenced by insulation conditions, predominantly moisture content and temperature. In this paper, the dielectric behaviour of a composite oil paper insulation system has been explained from the properties of Debye basic model. The measurement has been performed at controlled temperatures and moisture content in the paper...
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