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Electrical Engineering

Questions tagged [modeling]

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This tag covers finding models for electrical and electronic components and circuits

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When extracting the loop gain frequency of a nonlinear system: • What is a good way to ensure the disturbance injection sinusoid amplitude is small enough such that the response remains in a ...
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In the Ebers-Moll Model of a BJT we have 4 Parameters. The following images are taken from U. Tietze Ch. Schenk, "Halbleiter Schaltungstechnik" ("Semiconductor Circuit Technology") ...
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I have been attempting to formulate the averaged model of a dc-dc converter supplying the series wound dc machine operating in a given mode (for my question it doesn't matter what is the exact ...
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I'm trying to replicate the simulation for Fig. 15.26 (SEPIC example) shown below using the provided combined CCM-DCM averaged switch model (CCM-DCM1 subcircuit) in LTspice, as shown below, from ...
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While studying section 15.2, DCM Averaged Switch Model, of Fundamentals of Power Electronics, by Dragan Maksimović and Erickson, I came across where he says: Steady-state conditions in the converters ...
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I have following the so called switched model of a dc-dc converter supplying a series wound dc machine $$ \frac{\mathrm{d}}{\mathrm{d}t}i_f = \begin{cases} \frac{1}{L_a + L_f}\left[e - (R_a + R_f)...
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I’m studying averaged switch modeling (specifically Section 14.1 in Fundamentals of Power Electronics by Robert W. Erickson). The author states that once you derive an averaged switch model for a ...
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According to a derivation in this video, the diffusion capacitance of a forward biased PN junction is proportional to the exponential of the applied voltage across the diode. $$C_{diff} \propto e^{\...
Math Keeps Me Busy's user avatar
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I’m a PSI prep student, and as part of my studies, I’m working on a solar tracker system. My part focuses on studying the motor (the lower pivot that serves as the azimuth axis). Indeed, I’m trying to ...
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I have below given circuit where at the beginning the current flows in the path which has been emphasized via the red color (Note: All the wire crossings mean connected wires.). Suppose transistor \$...
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I am currently using Keysight Advanced Design System (ADS) to simulate a P-I-N Diode circuit and compare real life data such as RF power interaction, and DC I-V curve replication. I am currently ...
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I am wondering, how should a lossy metal be properly defined in CST microwave studio? Should it be a 3D solid with a specified thickness in the parameter list, or a 2D thin sheet where thickness is ...
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I am simulating a 3D cubic Fabry-Perot-like micro-resonator in the optical range using CST STUDIO SUITE. The structure consists of a dielectric cubic cavity (not vacuum) bounded by 6 metal layers on ...
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I have a circuit that has 2 ports, A and B, connected through a switch. I want to couple only the signal that's on A port to another port C. I don't want B port to couple on C. This is what I have: <...
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I have a buck dc-dc converter My goal is to identify a dynamic model of this circuit. The model shall serve for design of the inductor current control loop. Until this moment I thought the model in ...
Steve's user avatar
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A model of a single phase, \$500 \text{V} / 6 \text{V} \$ two winding transformer, with an ideal transformer in the middle is seen below simulate this circuit – Schematic created using ...
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What should the base value be for energy when using a per unit model for a power system? Normally, I would fix \$s_{\textrm{base}}\$ and \$v_{\textrm{base}}\$ and use that to determine \$i_{\textrm{...
wyer33's user avatar
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I would like to build a PWM switch model for the following voltage-fed push-pull converter (which operates in current mode) to determine its transfer function. I can handle simple topologies like ...
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I'm studying a solution for a weight measuring system that's affected by enviroment vibration - a load cell fixed on a "shaky" frame. My first thought was to use a 3-axis accelerometer (or ...
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I am reading Semiconductor Devices — Theory and Application (Fiore) about JFETs in chapter 10 and there are two drain current equations shown that do not agree with each other. The first equation is ...
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I am trying to simulate an electronical device that can be modeled by a mass-spring-damper system with an additional non-linear force. The equation at the equilibrium for the system is the following : ...
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Why do many models of MOSFET parasitic capacitances not include \$ C_{ds} \$? (the image taken from this site) In integrated circuits, MOS transistors usually have four terminals. If we consider ...
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How do I analyze an emitter follower with a capacitor load? At 7 MHz, a 1 nF capacitor has impedance of 22 Ω. A simple emitter follower with a 22 Ω Re is easy to analyze: However, replace that ...
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I obtained the LM76005-Q1 transient model from the Texas Instrument website and imported it to PSpice. The website also provides a Design Calculator software, so I basically use it to determine other ...
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Diffusion current in a MOSFET device can be calculated using Fick's Law per \$J=-qD\frac{d \rho}{dx}\$. It is often taken that the charge carrier configuration (\$\rho\$) across the MOSFET channel is ...
Schoppe's user avatar
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Looking through this answer about the 6N137 optocoupler I wonder where one can get all those paramaters like Is, Rs, N, various internal resistances, etc. that are used to simulate the optocoupler. I ...
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I try to model a simple RC circuit with input of 2 A DC and I get an out voltage (Vc) of 2 TV. I am not sure what I am doing wrong. EDIT: This is for MacOS
user510's user avatar
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How can one analyze, to some approximation, the current-carrying capability of a hollow cylinder with a diameter of 3 inches and a length of 6 inches, made from 100 μm thick copper with a resistance ...
user510's user avatar
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If I have a construction of layers wherein the topmost layer is conductive, followed by two different insulation materials in between, and a bottom structural layer that is a partially conductive ...
user510's user avatar
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i want to simulate the discharging behaviour of several battery packs/modules connected in series to simulate a discharge machine for a recycling facility. I wanted to simulate possible current/...
ElectricalStudent's user avatar
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I'm trying to learn about memristors to play with it in circuit design. I think it might be more intuitive to do tests and measurements rather than reading maths formulas. The problem is that I don't ...
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I derived an expression for the time constant of the temperature of an electrical conductor and was looking for some constructive feedback. Initially there is no current flowing through the conductor ...
user50655's user avatar
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1 answer
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motivation: A guy I worked with years ago (~2015) who is an EE said that "an electric motor was just another form of a transformer". I'm not an EE, so I didn't do things with transformers. ...
EngrStudent's user avatar
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There are of course equivalent circuit models for modeling practical passive components using idealized elementary circuit models that reflect the parasitic effects that occur at high frequencies , ...
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piezo materials are commonly modelled with the BVD model When the piezo is used as a sensor, they are commonly modelled as a current source in parallel with a capacitor because à external force ...
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I am semi-dangerous with switchers but I've never really delved into the innards of them so I'd like to ask about this TPS23750 diagram. I would like to develop a model of this feedback loop of a buck ...
Voltage Spike's user avatar
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So far I have not much experience with modeling in the field of lithium-ion cells or batteries except equivalent circuit models (ecm)-models which I've implemented and used for simulations in Matlab/...
Medi1Saif's user avatar
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I was wondering if there's a way of creating a simple MOSFET model that predicts how the following circuit behaves when voltage source V is varied. As I understand it, if MOSFET M1 is in the ...
Andrew Lees's user avatar
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Background I'm attempting to write a physics simulation code, one portion of which involves the simulation of the voltage observed at a set of \$N\$ radio antennae immersed in some medium due to ...
MomentumEigenstate's user avatar
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175 views

The equations for modelling most transmission lines can be based off the telegrapher's equations but the ones I found only account for parallel resistance with the capacitance, but I would like to ...
TWiz's user avatar
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2 votes
1 answer
217 views

As a sequel of this question, I built a mathematical model for the Id current of the following (same) JFET circuit: For a simplified model, I took LAMBDA=0 and set ...
edwillys's user avatar
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I am trying to build a simple MOSFET model (very simple, no parasitic capacitance, gate leakage, ohmic contact...) using LTspice to simulate school textbook example, but I don't know how to switch ...
Willis Lin's user avatar
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1 answer
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Source 1 defines the modulation index in the expression for FM as follows: As per the expression for frequency modulated wave, isn't the frequency deviation same as Modulation index 'M'? "The ...
Dynamic_equilibrium's user avatar
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9 votes
2 answers
552 views

I am trying to add a commercial GaAs FET model (ATF34143) in LTSpice XVII for simulation. The model is provided on this website (http://www.hp.woodshot.com/hprfhelp/design/SPICE/fets.htm#ATF34). ...
Matteo Aluffi's user avatar
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I was asked to perform MOSFET CV modeling. I looked through some papers, but I still can't clarify what the CV model equation for a level-1 NMOS is, and I am also not sure what its main parameters are ...
Ko Stuart's user avatar
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I've been looking for mathematical models for photovoltaic cells. Most of the references I've found use the following circuit to the model the behavior: Particularly, the diode current is modeled ...
puq_87's user avatar
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3 votes
1 answer
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I want to model a GaN transistor and include a diode to simulate its reverse conduction above ~2 V with an adjusted diode using the following model statement: ...
tobalt's user avatar
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2 votes
2 answers
787 views

Does anybody know the forward depletion capacitance formulas for diodes in spice models? Background: The capacitance of a diode in reverse direction usually is dominated by the depletion (or junction) ...
drahnoel's user avatar
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1 answer
249 views

I am trying to build some thermal models for leaded and surface-mount diodes and transistors. Below is a picture of the TO-220 outline I got from the internet. What kind of material is the black part ...
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I have a work titled MPPT P and O algorithm with a buck-boost converter. The software I am to use is Plecs. First I wanted to design a photovoltaic model in Plecs. I tried to follow an example I got ...
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