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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While choosing a MOSFET gate driver for a full bridge, what does one being "Tolerant to negative transient voltage, dV/dt immune" mean practically?

As part of designing an H-bridge module rated for 30V 50A operation, operating from a low ESR power source driving an unkown DC motor, I need to select a gate driver. The intention is for the circuit ...
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Bulk capacitance near a processor affecting converter transient response

Here is my question: why do manufacturers of processors and FPGAs prescribe adding hundreds or thousands of microfarads of bulk capacitance next to their part? The IGLOO2, for example, recommends a ...
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Shock load and voltage transient effects on industrial BLDC servos and drivers

I was wondering what effects shock loads (and any subsequent voltage transients) may generally have on industrial, BLDC-based servos and their control electronics. I'm especially interested in whether ...
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Instantaneous change in DC electronic load power

I am attempting to observe current transient behavior for a DC-DC converter when the loading changes instantaneously. For example, I want to observe current transients at the output of the converter ...
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Is the pulse voltage MNA matrix stamp the same as a normal DC voltage?

I am currently doing research on circuit simulators and trying to understand their techniques for simulating specific components. Now, I am at the state of trying to do transient simulation using ...
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6 answers
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Does switching on a bench power supply cause a voltage spike on its outputs?

In an Adafruit guide, it is claimed that bench power supplies may produce a voltage spike upon turn on: Source I cannot find any reference to this. My assumption is that their target audience (...
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How to create a steady 5V battery driven supply for ESP32, with huge intermittent power spikes through other step-up circuit?

Do I really need two batteries? I am having huge trouble keeping the 5 V power supply for the ESP32 microprocessor stable, while the other booster draws maximum power in pulses. The 5 V buck converter ...
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Why doesn't the capacitor fill to the maximum?

I am comparing a simulation and a real experiment I did in which my capacitor didn't fill all the way. The capacitor I used is 10 μF with a 1 kΩ resistor with a 12 V source. I have both graphs: This ...
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Why do I see a spike in this transient?

I'm trying to measure the V/I curve of a solar panel by recording a capacitor charge curve. Here is the circuit: The DC source and R4 simulate the solar panel (I know it's not an accurate model). An ...
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Protect a switching source from other electrical devices [closed]

I have the following problem: I have a WiFi electronic device in my kitchen to automate the lights using relays (made by me). It is based on a Wemos D1 mini microcontroller and the PSU is a Hi-Link (...
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2 answers
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How to solve this problem using transient time-domain analysis?

Find V0(t) in this circuit assuming zero initial conditions. I solved it (refer image above) using frequency-domain analysis using Laplace and found the answer, but I am not able to get the same ...
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First-order differential equation without using a Thevenin (or Norton) equivalent circuit

$$\frac{V_c-V_2} {R_2} + C \cdot \frac{dV_c}{dt} + \frac{V_c} {R_3} = \frac{V_1-V_c}{R_1}$$ $$V_c(0) = V_2 $$ I have tried to solve this with the help of MATLAB, but the answer from the book is ...
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Forcing current on capacitor tied to ground [closed]

I have a device with a capacitor tied to ground. If a negative current of 1 mA is being forced out of that pin, I am trying to better understand capacitor operation in this area. My questions are as ...
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Question about transient analysis in LTspice

Can anyone explain the function of these three options in transient analysis? Stop simulating if steady state is detected Step the load current source Skip initial operating point solution I was ...
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How do we calculate the sub-transient current (initial symmetrical short-circuit current)?

For the ease of understanding, I have divided my questions into two sub-parts: Per IEC 60909, the initial symmetrical short circuit current is calculated by: \$I_k"=\frac{cU_n}{\sqrt(3)Z_k}\$. ...
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Type-2 compensator transient response

I'm looking to find the transient response to a step impulse of a type-2 compensator. I already found the transfer function, but when it comes to finding the transient response by using the inverse ...
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Time step error after placing connection between component and transmission lines - ADS

I have recently created a project in ADS. It contains a couple of transmission lines, capacitors, and resistors. When I connect my transmission lines to the s2p file, transient simulation is done ...
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Capacitor-charging parallel circuit and given current

Given is a parallel circuit in which one branch consists of a capacitor C with a resistor R1 and the other branch consists of a resistor R2. See the image: If we apply a known voltage \$U_{tot}\$ ...
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How to modify s2p file of an IC? - ADS

I have a s2p file of a RF IC which it contains frequency from 650 MHz to 1.1 GHz. I wish to modify s2p model so that two frequency 0 Hz and about 3.5 MHz is added to the s2p file. How can I do that ...
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Internal timestep 2.45482e-13 too small at time 5.73394e-13 - ADS error

I want to do transient simulation in ADS. But I encountered with an error shown completely in the following message: Simulation message: ...
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Unexpected result when using RF pulsed generator in ADS

I am simulating a simple test circuit including an RFpulsed generator in ADS, but the simulation gived some surprising result. I have attached my test circuit schematic in the attachment. Moreover, I ...
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2 answers
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How to derive phase margin and gain margin from experimental step response?

I have a fabricated closed-loop integrated amplifier circuit. Therefore, I can only conduct transient response experiments. How Do I derive the phase margin and gain margin from the experimental step ...
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Transient Behaviour of current source into capacitor + resistor

Can someone please explain this transient behaviour circled - particularly the capacitor current? Capacitor has a relationship of I = C * dv/dt. I know the AC current will split based on the impedance ...
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3 answers
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Diode reverse recovery time and the speed (snap back) in which recovery takes place

I'm looking at generating a circa 1 nano second current pulse by utilizing the snap-back time (usually measured in the tens of pico seconds) when a diode is "forcibly" reverse polarized ...
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Transient Simulation - ADS

I'm facing a doubt in transient simulation in ADS. In many setups I've seen placing a resistor in series to the transient voltage step generator. Placing the series resistor, and simulating the below ...
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Can I power my microcontroller system directly from a 3V lithium coincell (transient consideration)?

My device has to be powered with user replaceable 2032 coincell. I have a ~3.3V microcontroller like nrf52832. Its datasheet says: So lithium coincell voltage range (3.3V - 0V) is in operating ...
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Transient analysis for circuits with AC excitation using differential equations

In the process of finding transient response for circuits with AC excitation using differential equations, we use the method of complementary functions and particular solution, but I read earlier that ...
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Difference between Harmonic Balance and Transient solver in ADS

I am performing a simulation of a half wave rectifier (HWR) in ADS. I had developed a MATLAB code for Harmonic balance solver and Transient solver in MATLAB. The code gives comparable results when ...
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2 answers
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Series capacitor not blocking DC voltage

In my understanding a series capacitor (with some resistance) works as a DC block, essentially forming a high-pass filter, blocking DC. Under this assumption, a unipolar square wave of amplitude V ...
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LTSpice RL circuit simulation with ideal inductor and inductor from database

I am trying to simulate a simple RL circuit as shown below, the top one using inductor from the component library and the bottom one is picked from the database. Below is the properties of L1 ...
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how does AC coupling eliminate the ground current problem between data source and destination in FPD_Link II I/F?

Reading about FPD-Link II in Wikipedia, I came across this statement for which I need clarification: Because the signal is DC balanced the application can use AC coupling, which eliminates the ...
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Is the power frequency characteristic of a network almost constant?

When a transient phenomenon happens in an electric power grid, the network reacts to this deviation with a power-frequency characteristic (MW/Hz). Reading the following paper ''Analysis and ...
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TRIAC protection for general domestic use

I am designing a smart switch for switching 220 - 240 VAC outlets for domestic use at a maximum of 16A. The load could be a washing machine, a toaster, a vacuum cleaner or any general home appliance (...
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How to add unit function u(t) - u(t-2) as voltage source in LTSpice?

As far as I know, we put the unit function as PULSE in LTSpice. If we have b.u(t) where b is a non zero integer, then we can put it in Von. But what if the function is u(t)-u(t-2)? And what if we want ...
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Output voltage of capacitor discharged in other capacitor?

Considering this circuit. How can I compute the maximum voltage across the resistor ? In this example, the capacitor on the left is initialy charged with 10 V. The second capacitor (on the right) is ...
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Explanation of the transient in an integrator circuit

Using LTSpice I have simulated the following circuit. It is a circuit integrator using the op-amp model: LF356. The simulation has a saturation voltage of 12 and -12 V and a square wave input source. ...
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Laplace analysis of coupled circuit confusion

So i solved this by first finding differential equations and then by taking laplace transform of them here are my working- for left loop $$5i_{1}\left( t\right) +4.9\dfrac{d}{dt}i_{1}\left( t\right) -...
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Ngspice convergence problem AD8606 simple simulation

I am new to electrical circuit simulation and I would like to simulate the behaviour of the operational amplifier AD8606 in a simple follower configuration, facing different loads. In order to do that ...
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Find v(t) across the resistor in first order circuit

I found this problem and it confused me a bit and I was hoping someone can clear me on this. Basically as I said we have to find the voltage across the resistor when the switch turns. This is a ...
2 votes
1 answer
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confusion in RC circuit regarding initial conditions and capacitor voltage

Actually i was practicing circuit analysis with Differential Equations. This question has some confusing parts like- In Steady State, t<0 switch is still open the 10mF capacitor is Charged to 5V ...
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Find voltage across capacitor

I want to see code. I don’t know how to write it.
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Switching Transient Protection For ADC Pin

I am playing around with one old transformer. I am trying to use it in combination with voltage divider to get AC 230V main into DC range (0-3.3V) suitable for ESP32 ADC input. I build circuit for ...
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Avoiding spurious second order in a first-order RC circuit

While solving the simple RC circuit below in a particular way, I came across an interesting mathematical quirk. simulate this circuit – Schematic created using CircuitLab Using nodal analysis, ...
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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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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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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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