Questions tagged [transient]

A change in an electrical system from an equilibrium or steady state. The response of the electrical system to a transient is its transient response. Examples of transients include load transients (in which the load suddenly changes) and line transients (in which the input voltage of an electrical system suddenly changes). The electrical system may require protection from certain transients, e.g. by using transient-voltage-suppression (TVS) diodes.

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42 views

Voltage Follower Op-Amp Circuit Transient Response

In a voltage follower circuit with negative feedback like the one below: How would the transient response of Vout look? My guess would be that if Vout is initially at 0V, when Vin is applied to the ...
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How to analyze first-order transient circuits using Simulink?

I have been trying to design a first-order circuit with a capacitor but, I could't achieve to initaliaze the steady-state condition. I mean I was not able to close the switch at t = 0. Since, I am ...
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What is "drive" (in units of coulomb) in this datasheet?

In the datasheet of the family of step-recovery diodes (they are essentially PIN diodes with the I layer "very thin") MMDx of MACOM (link here), following figure is given I understand that ...
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Modelling the PCB parasitic capacitance in LTSpice

I need to simulate the accurate behaviour of my attenuator made of an RC potential divider. Time constants of the top and bottom of my attenuator are matched. I noticed that when I inject a square ...
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36 views

Non-ideal transformer transient state

So, I've encountered a problem that doesn't look that hard, but I simply can't solve it. I have a simple non-ideal transformer circuit and I want to compute V_0. What I was able to find so far are the ...
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34 views

Finding Diff Eqs for Variable Square Wave Oscillator of Theremin

For a project, I built a theremin using an LM311N as the basis for my fixed and variable oscillators. I wanted to find the period of the variable oscillator by finding the systems of diff eqs ...
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What is the physical model for energy flow in or around a lossless conductor during transient analysis? (Veritasium Electricity in Wires)

Context Veritasium - The Big Misconception About Electricity - Energy Doesn't Flow in Wires Note I do not agree with the answer (D) given by Veritasium which is only plausible if any tiny current ...
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48 views

Extracting Transient Response from a Rational Transfer Function

I am reading an online book on digital filters and wanted to know how the transient response can be obtained from a rational transfer function. $$\frac{b(1) + b(2)z^{-1} + \cdots + b(n_b+1)z^{-n_b}}{...
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fitting using unstable poles

I am trying to take into account the frequency dependent behavior of R and L in an LTspice simulation. So I fit their frequency behavior using Vector fitting technique and deduce the equivalent ...
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Purpose of reverse biased diode in pulse generation circuit

(Caveat: "young player" at large here.) The circuit below (not my creation) debounces a push button and generates a 1us negative pulse when it's pressed. I breadboarded it and it works as ...
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Calculating capacitor voltage with initial conditions in an RC circuit

If the initial voltage of the capacitor at 0s is 20V, would the equation for the voltage of the capacitor at a specific time be; 60 + (20-60)e^(-t/RC) or would it be 80 - 60e^(-t/RC)
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Transient behaviour of capacitor discharge [closed]

As far as my understanding, I think of a decaying exponential curve of a current in the case of a capacitor discharging. But sometimes (not sure on this), it shoes a damping waveform -- there are some ...
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190 views

What is the time constant for this circuit?

In this practice problem, the book apparently got the value for the time constant to be 0.1ms. This means that it only considered the 100k resistor to be the Rth. Why is the 10k resistor ignored? ...
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Measuring extremely small inductance (pH) with transient pulse response

I've made an inductor device. It has 2 terminals. It has inductance, resistance, and some parallel interwinding capacitance. I am using a Keysight B1500a semiconductor probe station, which has ...
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Transient generator simulation torque fluctuation (Ansys Maxwell)

while simulation for a PM axial flux generator at no load 1000RPM in Ansys Maxwell, shows moving torque fluctuating between -0.7 to 0.7 Nm, which should have been 0, as there is no load attached and ...
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118 views

Short-circuit current through disconnected capacitor

I have a large capacitor made of two smaller 200V rated 560uF capacitors. If I charge this capacitor to 30V with 4.5A from a bench power supply and disconnect it after around 7 seconds, how do I ...
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127 views

LTspice ideal diode simulation

I was trying to simulate a biased clipper circuit in LTspice, and came across this issue. This is the schematic I used: And the plots of voltages across V2 and R1: Ideally, the output voltage should ...
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93 views

Laplace of energy sources

What's the Laplace transform of an independent DC voltage or a current source? I came across this while reading transients from a book. While solving a first order circuit in Laplace domain, it took ...
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48 views

Transient and Surge Protection

It seems that when choosing ESD/TVS diodes, MOVS and GDTs that while their clamping voltage is rated in Volts, their protection is rated in Watts or Joules. For example, the LittleFuse SMCJ250CA is ...
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142 views

Reverse voltage spike protection on high-side of a (coiled) relay without flyback diode

I have a microcontroller interfacing with a normally-open automotive relay on the high-side, through a P-MOSFET. When the microcontroller closes the P-MOSFET's Source & Drain (by sending LOW ...
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76 views

Validity of small signal model during transient state

In most of the books it looks like small signal is used as a steady state analysis, for example a capacitor is modelled as: $$Xc=\frac{1}{j \omega C}$$ Which clearly indicates a steady state analysis. ...
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How is constant on time control better than voltage mode control for transient response?

I am trying to understand the benefits of constant on time control (COT) over voltage or current mode control. In voltage mode control, during a load transient (increase in load) an aggressive control ...
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Question - Calculating Coefficients for 2nd Order Transient Analysis

I am struggling with calculating the coefficients for second order transient analysis. For example, when analyzing a underdamped circuit, we know that the equation for voltage or current is \$x_{t}=e^{...
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RL Transient Analysis confusion

simulate this circuit – Schematic created using CircuitLab When I am using Thevenin's circuit and deriving inductor currents equations i am getting different Time constant \$ \tau\$ from what I ...
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112 views

AC Transient analysis of an RL or RC circuit

When an AC input is applied, the inductor in initial condition (uncharged) does not act as an open circuit, even though the magnitude of instantaneous AC voltage constantly varies. Why is its behavior ...
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How to control the transient output current of a synchronous buck converter?

I am dealing with the following problem, I want to control the output current and voltage of a synchronous buck converter during the output load (resistor) step change. Suppose we set the output ...
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Window comparator with transient detection

I need some advice with over range circuitry I my design. In summary, I need to probe two nodes in my circuit and raise an alarm if any of them raises above approx. 2V peak (in both polarities). The ...
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369 views

I need to implement DC and transient analysis of diode and transistor circuits. How can I do that?

I am doing a MATLAB project at my university. I have tried to implement DC and transient analysis of diode and transistor circuits by linearizing them and using iterative methods, but the results don'...
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What to do when studying "travelling wave" in a coaxial cable?

Propagation of travelling waves on cables may sometimes be difficult to apply and understand. There is a method called in french "abaque de Bewley" or "diagramme de Bergeron" (in ...
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Measuring a voltage signal with a very steep ps risetimes

Lets say there is a black-box which gives a voltage output that evolves temporally from nV regime to few 100s of μV regime, in very short time scales. i.e the signal evolves from nV to μV in ns with ...
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Taking into account the mutual inductive coupling analytically in LTSPICE

I am trying to take into account the mutual inductive coupling between three turns in LTspice differently. Instead of defining the inductive coupling coefficient K, I am using the analytical ...
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238 views

Transmission Line Step Response

This question seeks a canonical answer to a question regarding the transient response of a transmission line. Suppose one has a transmission line, long enough to be considered "infinite" for ...
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45 views

Buck regulator transient response explanation

I am using TPS5450 buck regulator and trying to measure the transient response but seem to see a weird triangular adjustment before it settles. I can't see anything in the datasheet that would explain ...
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Independent and dependent initial conditions

Consider the RLC circuit below. In fact, it is a normalized filter with Butterworth approximation of 3rd order. Now suppose that for some reason I am interested in the time domain formulation. Using ...
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Books on network theory [closed]

I really want to know which books should I read to learn the subject- Network theory in electrical engineering. I know there are some popular books out there in the market, but I will really ...
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203 views

How to find current through inductor when connected in series with an ideal diode?

Please help me with this simple circuit, which is creating lots of confusion due to different results from theoretical calculation and SPICE simulation. Ques: In this circuit switch is closed for time ...
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75 views

TLV431 based voltage regulator, possibility of exceeding Vka max. at startup

I need a small (15mA max.) voltage regulator and considering a TLV431 + emitter follower: This works fine but the datasheet states Vka as 7V absolute max. My input voltage Vi however can be as high as ...
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Why is my Pi Pico resetting from HDMI hotplug (transients question)

Why exactly is my Raspberry Pi Pico (MCU) resetting during HDMI hotplugs with my simple HDMI signal sniffing circuit? Although the solution to this is obvious, I'm curious as to exactly what's ...
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66 views

Input transient voltage of a regulator

I am using a regulator in a design. The regulator gives 5V output with 9V to 60V input. The datasheet says that the input transient voltage is 80V/second. Does this mean the regulator can handle an ...
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78 views

Voltage and current during the first cycle of RL circuit

I have a simulation of RL circuit connected with an ac source. Any one can tell me please that why the peak of the current during the first positive half cycle is higher than the peak of current ...
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66 views

Circuit for simulation

Can someone please help solving for my circuit connection, I'm new to this and somehow didnt manage to simulate the circuit correctly as the software stated this Warning: Inductor-voltage source loop ...
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175 views

Transients in series RL circuit with AC source

Why the transient current will die off in series RL circuit with AC source ? Every time the ac voltage source reverses direction so does the current and the current has to pass through the same ...
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Coupled current in shield in a tube from a transient surge

If a shielded cable (B) is running inside the centre of a tubular structure (A), how is the coupled current from a surge estimated in the shield? I am trying to figure out how the coupled current ...
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63 views

What would cause DC bus voltage on my VFD when the disconnect is off

125 hp 480 vac HMax VFD. Controlling a pump motor. Motor is not spinning and line to the VFD is disconnected. I was putting the output wires back on the VFD, when moving the second one into place, ...
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The transient instantaneous power dissipation of an impedance

Suppose we have a resistor of value R in parallel with an inductor of value L with series resistance R. The impedance of the network is $$Z= R\frac{sL+R}{sL+2R}.$$ simulate this circuit – ...
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Artifacts in transient analysis

Is there some rigorous treatment of convergence issues in transient analysis? I am using LTSpice. In transient analysis with maximum time-step is used. Fundamental oscillatory frequency of analysed ...
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60 views

TPS43061 simulation problems

I started working on a single series lithium to 15V / 2A Boost converter based on this design: https://www.ti.com/tool/PMP8921. I got this PSpice simulation model from TI themselves here: https://www....
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Regarding Magnetic coupled circuit

Here, all the initial conditions are : i1(0-)=0A and i2(0-)=0A When t≥0, the current i1(t) and i2(t) starts flowing. From my assumption, steady state value of i1(t) is 10A but what happens to i2(t)? ...
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About series RLC circuit

Here I am trying to solve the circuit and from my calculation, I got, I(t)=3e^(-2t) - 3e^(-3t) and Vc(t)=12-18e^(-2t)+12e^(-3t) When Initial conditions are; I(0-)=0A and Vc(0-)=6V From my assumption, ...
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Transient analysis of parallel RLC circuit

Here, I am solving this circuit where Capacitor acts as a voltage source of 10 V. Switch is closed at t=0,and Vc(0-)=10V,I2(0-)=0. When t≥0, what will be the time constant and frequency of the circuit?...

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