Computer methods for switched circuits

Yuan, Fei; Opal, A.

doi:10.1109/tcsi.2003.815193

Cited by 36 publications

(1 citation statement)

References 48 publications

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“…The accuracy and stability of these methods have been assessed in a number of research papers and compared to alternative integration formulas such as implicit Runge-Kutta methods [13,14]. Some of these pay special attention to the solution of discontinuous systems that result from switching components in electronics circuits [15,16]. Moreover, strategies like index reduction [17] and model order reduction [18,19] have been proposed to streamline the solution of the system equations.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Methods for the Real-Time Simulation of Electronic and Thermal Circuits

et al. 2020

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Time–domain simulation of electronic and thermal circuits is required by a large array of applications, such as the design and optimization of electric vehicle powertrain components. While efficient execution is always a desirable feature of simulation codes, in certain cases like System-in-the-Loop setups, real-time performance is demanded. Whether real-time code execution can be achieved or not in a particular case depends on a series of factors, which include the mathematical formulation of the equations that govern the system dynamics, the techniques used in code implementation, and the capabilities of the hardware architecture on which the simulation is run. In this work, we present an evaluation framework of numerical methods for the simulation of electronic and thermal circuits from the point of view of their ability to deliver real-time performance. The methods were compared using a set of nontrivial benchmark problems and relevant error metrics. The computational efficiency of the simulation codes was measured under different software and hardware environments, to determine the feasibility of using them in industrial applications with reduced computational power.

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Section: Introductionmentioning

confidence: 99%

Assessment of Methods for the Real-Time Simulation of Electronic and Thermal Circuits

et al. 2020

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Swept area theory: an approach in nonlinear and switched network analysis

Barcellona

Superti-Furga

2015

Circuit Theory & Apps

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In this work, according to the concept of 'area' on the v-i plane, a new approach called swept area theory, under both nonlinear continuous and discontinuous conditions, is developed. Novel conservative functions, such as area velocity and closed area over time (CAT), involved in this theory, are proposed. An analysis is carried out, by means of these functions, over nonlinear R, L, and C elements and over the ideal switch. In addition, jump discontinuities are discussed in detail. The CAT is related to the harmonic reactive powers and under sinusoidal steady state becomes proportional to the classical reactive power. A balance rule concerning harmonic reactive powers over nonlinear resistor under continuous conditions is obtained and discussed as a novel interesting result. This aspect impacts on a possible expanded definition of reactive power under distorted conditions. Thanks to the switching power, a novel quantitative relation between hard-switching commutations and CAT is obtained, with both theoretical and applicative relevance. More explanation is presented through a demonstration that shows how an ideal switch and power converters can become sources of reactive power. Issues of principle regarding the ideal switch model with respect to the real one are another important result of this work.So far, only time-invariant nonlinear networks have been dealt with, whereas time-variant networks are usually considered by means of switches. The general problem and solution methods of switched networks are presented in [19][20][21][22][23]. Classical issues in the presence of switching are network solution and inconsistent initial conditions. Network solution (with related problems of uniqueness of solution and stability) is fulfilled by several methods, of which one of the main is the complementarity approach, where switching is basically external constraint to a time-invariant multiport [24]. Inconsistent initial conditions, caused by switching, imply discontinuities on state variables and impulsive behavior on some voltages or currents, as addressed in depth in [25,26]. Nevertheless, as a whole, it appears to lack general principles as well as applications of generalized power in the field of switched networks; a notable exception is the 'connection energy' [27].Another important aspect that appeared previously is the 'area' on the v-i plane. From this idea in [28], a conservative function was proposed, called 'mean generalized content' (MGC), which is balanced and under periodical continuous steady-state conditions is invariant on nonlinear resistors. Therefore, the MGC could be seen as a generalization of the reactive power in distorted conditions [29]. In [30], the MGC was extended to circuits with ideal switches. In that paper, the definition of switching power (SP) was introduced, and a relationship between switching and reactive power was outlined.Following the aforementioned area approach, this paper intends to develop the swept area theory (SAT), which widely uses the concepts of trajectory and area on ...

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Retracted: High‐speed FSK modulator using switched‐capacitor resonators

Salehi

2015

Circuit Theory & Apps

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In this paper, an ultra-fast frequency shift-keying (FSK) modulation technique based on switched capacitor resonators is presented. It is demonstrated that switching a reactive component such as a capacitor, in a high-Q resonator with proper switching signal can preserve the stored energy and shift it to a different frequency. Switching boundaries are found by continuity of electric charge and magnetic flux. It is shown that if switching time is synchronous with zero crossing of the voltage signal across the switched capacitor, impulsive components can be avoided, and continuity of electric charge is satisfied without energy dissipation. We use this property to realize a fast binary frequency-shift keying (FSK) modulator with only a single RF source. In this technique, the modulation rate is independent of the resonator bandwidth and can be as high as the lower carrier frequency. Experimental results are presented to validate the simulations.

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Computer methods for switched circuits

Cited by 36 publications

References 48 publications

Assessment of Methods for the Real-Time Simulation of Electronic and Thermal Circuits

Assessment of Methods for the Real-Time Simulation of Electronic and Thermal Circuits

Swept area theory: an approach in nonlinear and switched network analysis

Retracted: High‐speed FSK modulator using switched‐capacitor resonators

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