Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [modelling]

24 questions
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Lookup tables in LTspice

I'm trying to implement at fuel cell in LTspice, using the lookup table function and a Arbitrary Behavioural Voltage Source (ABVS). I specify the I-V relationsship from the datasheet as: V = table(I,i1,v1,i2,v2,....) This is quite cumbersome for…
Jacob Bitsch Nørgaard
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What is wrong with my inverted pendulum?

I have been making an inverted pendulum using LQR. Here's a list of my hardware: Microcontroller: Microchip WiFIRE (PIC 32) Motor Control: L298N Encoders (2x): US Digital shaft encoders (4095 counts) DC Motor: Faulhaber Coreless DC…
DanielPatrick
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1 answer

What is the effect of tachometer feedback (derivative feedback) on the time constant of a control system? Does it increase or decrease?

I was going through some practice problems on Control System Modelling and came across this problem. It seems like the answer to this question is that the time constant is "reduced" but the result that we get from a quick tranfer function analysis…
erstan
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What are the rationales behind real wire (transmission line model), real capacitor and real inductor model?

I have been pondering about how the real model of circuit elements (wire, capacitors and inductors) and transmission model are derived through intuition (based on physics). Here are my references from Practical Electronics for Inventors 4th…
DivineMK
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2 answers

Model positive exponential current curve on LTSPICE

I am trying to model the inrush current for a contactor. From the specifications I should get something like this: The hold current is 0.13A and the inrush current is 3.2A. This is controlled using R3 for the 0.13A and R2 for the latter. Switch SW…
JoeyB
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Modified Gummel-Poon BJT Modelling Issue

First of all, sorry for my bad english. Output for Vb: From the schematic above, I redrew the 2N3904 BJT into the modified Gummel-Poon model. Output for Vb: The equation for B1, B2 and B3 were determined using the info below. Then, the values…
SpiceQues
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Calibrating DAQs

I'm using some of National Instruments' DAQs for some measurements, but their calibration is slightly off. To work around this I am hoping to factor in any imperfections into the measurements such that they can be removed. The objective is to find…
loudnoises
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Model Microcontroller's Power Consumption

I am currently building a simulator (time-domain model) that includes a System-on-Chip, a constant voltage source and a series resistor. Current solution: My initial intuition was to model the SoC's consumption as a constant-power-sink: I attribute…
MoTex_42
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1 answer

Modelling of current flow in a plate or plane

Is there an FEA technique for modelling current flow in an irregularly shaped conductor, other than by applying nodal (or mesh) analysis? I want to create a model of the current flowing in a PCB that is not a "regular" shape, such as where the large…
Willy--
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Linearization of Non Linear State Space Model

Im designing a PI controller for a Maglev experiement but im a little stuck on how to linearize the non linear state space model. I have developed the state equations (seen below) and i know the equilibrium point of interest below. But im stuck on…
jpg4321
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How determinate parameters for thermal-model battery (Advanced question about battery modelling)

I'm trying to simulate an electrical model based on Ceraolo battery model for lead-acid battery. The challenge in this model is to determine the parameters that describe it. I can understand and estimate most of the parameters. However, it is still…
SrnLord
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Verilog A modelling of THz detector

I am working on modelling a THz detector in Verilog A. Graphene FET can be used as a THz detector which generates DC voltage proportional to the intensity of the input THz signal as given by the equation shown below (research paper). Here, the input…
prashanth
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Modelling of a DC-DC Buck boost converter

I'm looking for some help with the following questions as not 100% where to start. I'm looking to derive the model for the averaged circuit of the buck-boost converter. My understanding is that I need to use KCL and KVL and derive equations for the…
Ben120
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Modelling two real capacitors in parallel

I am currently trying to model parts of an electronic system in Simulink using standard (discrete) blocks. I'd like to model two capacitors connected in parallel incl. their series resistances (ESR). In SPICE this would look like this: Writing down…
MoTex_42
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BMS BQ25731 modelling using datasheet

How Can I design model for BQ25731 BMS using Datasheet? What procedure I need to follow Or what should I look for in a datasheet? Any suggestion or any Application note you recommend. I'm asking this because I have never made a model of any IC…
Uzi.4
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