An adaptive stepwise quadratic state-space modeling technique for analysis of power electronics circuits

A new finite element technique that allows nonlinear time domain analysis of power electronic circuits containing magnetic components is presented. The new technique is shown to compute the same voltage waveform in a nonlinear RLC circuit as previously published circuit techniques. The new technique is demonstrated for a circuit containing an inductor with a nonlinear B-H curve, finite conductivity and a given geometry including air gaps. >

Waveforms arising from power electronics circuits often contain slowly changing segments with high‐frequency details concentrated near the switching instants. Such a feature is consistent with the localization property of wavelets which are known in the signal processing literature to be highly suitable for describing fast changing edges embedded in slowly varying backgrounds. This paper considers the application of wavelet approximation to the steady‐state analysis of power electronics circuits. The basic procedure of wavelet approximation is reviewed, and an improved approach by mixing wavelets of different levels is described. When applied to power electronics circuits, the method yields efficient solutions because only a relatively small number of wavelets are needed and the proposed algorithm involves only matrix operations, permitting the steady‐state waveforms to be found fast. Copyright 2003 John Wiley & Sons, Ltd.

This paper describes SUPRA (Simulator for Unified Power Regulators Analysis), a new simulation tool for the behavior mode simulation of switchmode power supplies. This simulation tool uses the variable- topology simulation method (VTSM) in conjunctio

El presente trabajo expone el diseño e implementación de un convertidor DC/DC Boost no aislado que opera con una carga nominal de 20 W, voltaje de salida constante de 24V y voltaje de entrada variable de 12 ∓25%V. El desarrollo se llevó a cabo en los laboratorios de Electrónica de Potencia, del programa de Ingeniería Electromecánica de la Universidad Francisco de Paula Santander siguiendo la metodología de solución propuesta, y cuyos resultados permitieron concluir que, el sistema de control PI implementado mejora la respuesta dinámica del convertidor en lazo cerrado en comparación con la obtenida en lazo abierto, presentando errores de estado estacionario que oscilaron entre el 1.66% (para un Vin de 9V) y 3.33% (para un Vin de 12V y 15V) en relación a los 24V deseados, logrando estabilizar el voltaje de salida para los diferentes cambios de tensión generados en la entrada, demostrando así, la importancia que tienen los sistemas de control y las herramientas de simulación en el diseño y análisis de los circuitos en la electrónica de potencia.

A variant for numerical simulation of a high-frequency converter with voltage-fed inverter

A computer-oriented approach for transient and steady-state analysis of power electronics circuits is presented. The switching elements are extracted in a time-variable two-port, which is defined by its nodal equations. A set of modified nodal equations for describing the overall transient of the circuit is obtained. No small-signal approximations are required. The analytical expressions of the network waveforms are found accurately for each switching stage. The transient computation is based on a cyclical use of these expressions together with the threshold conditions. The general method is then applied to simulation of current-mode quasi-resonant converters. Transients due to large-signal changes in the line voltage and load are studied. The influence of the load value on transient peaks is pointed out. The voltage conversion ratio versus switching frequency is studied for both the half-wave and full-wave mode operation. A computer program for time-domain simulation of power electronics converters is developed based on this approach. >

Analysis and design of analogue electronic circuits using DPI methods — Part 2: circuits containing different types of active devices Circuits with combinations of bipolar and field effect transistors as active devices are studied. It is shown that dealing with such problems poses no additional difficulties. An example is given.

Computationally efficient large-change statistical analysis of linear electronic circuits

Computation of corona effects in transmission lines using state-space techniques

A hierarchical symbolic analyzer (SAGA2) for the analysis of electronic circuits is presented. SAGA2 analyzes lumped, linear, or linearized (small-signal) circuits in the S- and Z-domain. For large circuits, a hierarchical two-port method is used that is two to three order faster than that without using the hierarchical method. Also, the memory used is dramatically reduced.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

This paper is focused on the Internet Graphical Simulation Tool for computer analysis of electronic circuits and describes all main features and advantages of using this tool for computer modeling and simulations of electronic circuits. Internet Graphical Simulation Tool (IGST) provides easy way for modeling and simulation of electronic circuits without necessity of purchasing expensive software license or installing some special simulation software tools. IGST can be used anywhere access to the Internet is available. IGST is composed from three main parts which provide basic PSpice analyzing functionality for any electronic circuit. The first part of the IGST is a GUI for interactive drawing and editing of electronic circuit’s schema. The second part is a simulation core from freely available older version of the PSpice simulation software and the last part of the IGST is an Internet graphical environment for displaying simulation results. Based on these three parts the IGST creates complex tool for easy analysis of electronic circuits through the Internet.

In the analysis of electronic circuits, it is often useful to replace a network by its Thevenin equivalent circuit. To do this one needs to calculate the values of the equivalent voltage and series resistance. It is shown that the prescription for finding the equivalent resistance given by most electronic texts is not generally valid when the network contains sources whose strength is controlled by currents within the network. In fact, the source strength coefficients appear in the expression for the equivalent resistance, yet would be eliminated by the usual method of short-circuiting the sources. A correct method of derivation is given and the emitter–follower circuit is shown as an example.

Distortion analysis of nonlinear circuits is very important for designing analog integrated circuits and communication systems. In this letter, we propose an efficient frequency-domain approach for calculating frequency response curves, which is based on HB (harmonic balance) method combining with ABMs (Analog Behavior Models) of Spice. Firstly, nonlinear devices such as bipolar transistors and MOSFETs are transformed into the HB device modules executing the Fourier transformations. Using these modules, the determining equation of the HB method is formed by the equivalent sine-cosine circuit in the schematic form or net-list. It consists of the coupled resistive circuits, so that it can be efficiently solved by the DC analysis of Spice. In our algorithm, we need not to derive any troublesome circuit equations, and any kinds of the transformations.

The time domain analysis of switching circuits is a time consuming process as the change of switch state produces sharp discontinuities in switch variables. In this paper a method for fast time-domain analysis of switching circuits is described. The proposed method is based on piecewise temporal transient analysis windows joined by DC analysis at the switching instants. The DC analysis is carried out by means of fixed point homotopy to join operating points between consecutive time windows. The proposed method guarantees accurate results reducing of the number of iterations needed to simulate The circuit.KeywordsTransient AnalysisTime Domain AnalysisSwitching CircuitSwitch CycleHomotopy MethodThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Thermal analysis of layered electronic circuits with Green's functions