Questions tagged [transient]

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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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51 views

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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39 views

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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46 views

transient analysis with square wave

I was doing the transient analysis experiment with the Series LCR circuit, and my mentor asked me some questions, which I don't have a clue about. I read but did not get any rigorous satisfactory ...
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27 views

Harmonic Balance works, transient does not work!

I have an oscillator circuit and the harmonic balance simulation shows there is oscillation in Vout: However, when I run a transient analysis, the results are totally different and show there is no ...
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61 views

pseudo transient analysis issue

Note: pseudo transient analysis issue means that the LTSpice simulator is stucked with running pseudo transient analysis forever without any output waveform results. The pseudo transient analysis ...
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1answer
37 views

Transient RL circuit analysis

Can anybody help me with the transient analysis problem? I tried to solve and here are my results:I(t)= 2-e^(-2.5t) A i1(t)=i2(t)=I(t)/2 =(2-e^(-2.5t))/2 =1-0.5e^(-2.5t). but if you observe the ...
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88 views

Why does LTSpice take so long to solve this circuit?

Using a technique to model transformers for a wide frequency range, I got at a circuit like this one: https://1drv.ms/u/s!AhR86nrv-ZA7ivoz9BZIoXfs4GwXIQ?e=L6mcKd LTSpice takes a long time to solve ...
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101 views

LTSpice transient simulation of LC circuit

I've a question about the LTSpice simulation of the following simple LC circuit driven by a DC current source. The first simulation (A) looks good from point of view of initial conditions for either ...
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3answers
67 views

Capacitive dropper power supply for LED - zener/decoupling capacitor?

Let's say you have a standard capacitive dropper power supply like the following (from Wikipedia): I understand that these work well for driving LEDs since they act like a constant current source. I ...
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1answer
60 views

How to pick an amplifier for very fast transient signals?

I'm coming to this with a Physics background. I work in solar cells. I would like to flash the solar cell with a laser and measure the voltage response. The University has a spare 10 GSPS (gigasamples ...
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59 views

How to protect a GPIO pin with a long input wire from transients?

I am building a custom doorbell system that will support multiple doorbell buttons and annunciators. I am using an Adafruit Feather and a couple of FeatherWings for each unit. The project can be ...
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2answers
269 views

Very short rise and fall time with relay

My question is related to the question here. I need very fast rise and fall time (below 2ns) and pulse width of 50ns. Load is 50ohm and voltage is 250V. I have achieved the rise time with a mercury ...
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2answers
92 views

Small signal digram

According to this figure how to get qeuation(7)and(8)
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53 views

Bandwidth and load transient

In this paper "Critical Bandwidth for the Load Transient Response of Voltage Regulator Modules", they have an equation about average inductor current during the step-down transient. They don'...
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1answer
68 views

Problem with Micro-cap 12

I hope it is okay to post a software question here. Please let me know if not. I've been learning about Microcap 12 (a SPICE simulator), and have been quite impressed. However, recently I got stuck. ...
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49 views

DC-DC converter cause PC GPU computer to shut down

I am currently trying to power up a edge GPU computer that runs on 12-19 V and is rated for 60 W. Whenever I start to overclock my computer to run some machine learning stuff, the computer will just ...
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2answers
222 views

Getting the transfer function of a parallel RC circuit. Am I allowed to simplify/remove the component I am trying to solve for?

simulate this circuit – Schematic created using CircuitLab Say we have that simple parallel rc circuit and we were tasked to get the transfer function of V_c(s)/V_i(s). We were told that it is ...
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86 views

Find the phase angle of the of the sinusoidal input that will make the natural response zero

Say we have a simple rl circuit with R = 0.5 ohms, L = 0.1 H and the sinusoidal input of : $$ V_s = 13800√2sin(120πt+β)$$ Then we were tasked to: I know the form of the solution of i(t) would look ...
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1answer
46 views

Initial Conditions and Parallel Resonant Circuit Problem

simulate this circuit – Schematic created using CircuitLab I already did my own solution but I just want to check if I got everything right, especially in determining the initial conditions. ...
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1answer
57 views

LTSpice AC analysis and DC analysis don't agree?

I have a simple circuit pi circuit. When I do the math and subsequently run the simulation on LTSpice, I get a similar answer - the resonance occurs at f= 217447Hz (math), 217450(LSpice). The error ...
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35 views

How do I solve this question?

In the given figure, the steady state is reached with the switch open. At t = 0, the switch is closed. Find Vc(t) for t > 0. How do I proceed solving this question? So far, I've tried applying KVL ...
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2answers
96 views

Calculation of the capacitor value across the base and emitter to avoid unexpected turn ON of transistor

There is a design recommendation to add a capacitor across the base and emitter of Q2 to avoid the unwanted/unexpected turn ON of Q2. Calculation of new capacitor across Vbe: My questions : Can ...
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0answers
71 views

Lithium ion battery pack busbar thermal calculation

I am designing busbars for lithium-ion battery pack which is 14-series, 9-parallel combination. We have taken busbars sizes as per the industry standard current density 3A/mm2. (Total current 48 A, ...
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1answer
46 views

Circuit analysis of series diode clipper circuit

simulate this circuit – Schematic created using CircuitLab I'm really unsure how to start with this. The instructions said to find Vin such that Vout will be 0.5Vin. The only given is Vd = 0.7 ...
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1answer
80 views

Clamper Circuit Without A Resistor Analysis

simulate this circuit – Schematic created using CircuitLab We were given this clamping circuit and were tasked to plot Vc and Vout for varying input. The only given quantities are the forward ...
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2answers
170 views

Reversed and Forward Biased Diodes in Parallel

simulate this circuit – Schematic created using CircuitLab We were tasked to find the node voltage V. My analysys: The way I approached this problem is to first make the assumptions of the ...
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2answers
176 views

Determining Vo in a diode circuit using iterative analysis

simulate this circuit – Schematic created using CircuitLab Say we have this circuit. Then we were asked to find Vo using iterative analysis. We were told to stop when the estimate is accurate ...
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1answer
107 views

Resistor in parallel with a short circuit. Will current flow through it?

I'm trying to find the Isc of this circuit seen by the capacitor at t > 0 so I could find the Rth and get the circuit's time constant. If I make the capacitor a short circuit, it will be in ...
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79 views

Step response of voltage inverter and RC filter homework question

This is my solution so far: Vth would simply be the output of the inverting op amp which is Vth = -(Rf/Ri)Vi Rth would simply be R2 || R3. simulate this circuit – Schematic created using ...
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2answers
168 views

Can open circuits have 0 potential difference?

So I do know that the capacitor will be an open circuit at t < 0 (also at t > 0) since it is connected to a DC source. But since at t < 0, the switch is also open, meaning i will have another ...
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1answer
46 views

Transient current value

I am working on a SMPS and wanted to size a varistor at the input to protect the rectifier against transient overvoltage (let's say a 1 ms surge). However, by looking at datasheets the maximum ...
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2answers
130 views

Transient analysis of a marx generator

I wanted to mathematically find the voltage on all capacitors in a Marx generator circuit. I thought that each capacitor would be charged like its own RC charging circuit. I came up with these ...
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1answer
55 views

Help with finding the value of current through a resistor in an RL circuit at a specific point in time

This is a homework problem for my circuit analysis class. I can't figure out what the heck I did wrong. I know the solution to the relevant ODE is of the form I(t)=k1+k2*e^(-t/(R/L)), so I just need ...
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126 views

Time constant of 2nd order system

Why there is no general definition of time constant for 2nd or higher order systems , while 1st order systems have a proper definition of time constant. is Time constant defined for every systems ...
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2answers
419 views

Zener diode response time

I have the below circuit: Forward diode D0002 - Datasheet SIJ series for reverse protection and C0001-C0004 capacitors for ESD protection. Zener diode - Datasheet - 36V reverse breakdown. Question : ...
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32 views

Transient and steady state of marginally stable system

I know that if a system is asymptotically stable then after infinite time its output contains only characteristic of input signal and it is also known as steady state and there are no transient ...
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2answers
92 views

Transient solution of current in circuit with two coupled inductors, with resistances

Circuit in question is given below. I want to find why I can not get the same current waveform as PSpice gives me. Basically I want to calculate formula for i1(t) by hand and get something as close ...
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0answers
65 views

Automotive reverse current and transient protection

Adding reverse polarity and reverse current protection to an automotive circuit seems a bit challenging, especially when driving loads in the 10A range (e.g. seat heater). Diodes on the power line ...
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1answer
36 views

What happens to the steady state of the series RC circuit if changes happen to any circuit element?

The question that I'm trying to understand is the following: In any series RC circuit that is in steady state, WHEN any of the elements changes (R, C, or applied voltage), the following will happen ...
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33 views

transient analysis inductor voltage [closed]

In transient analysis, when at steady state, the inductors behave like a short circuit. Can I apply the voltage divider rule, to find the voltage drop across the inductors in series?
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1answer
67 views

How to design a low pass filter for Fourier Square Wave

I am trying to create a low pass filter with a cut-off frequency of 100Hz to retrieve a sine wave from a Fourier Square Wave. I am only able to achieve a sine wave with transients. How can I edit my ...
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30 views

How can I make LTSpice calculate the transient response starting from a time different than t=zero?

I'm creating a schematic and I'm trying to simulate it using LTSpice. However, my RC time constant is quite large, and I'd like Spice to simulate only from around 10ms onward. I know that if i set ....
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92 views

How to use the print step option in LTspice XVII?

I'm aware of the print_step option for transient analysis, but I can't seem to get it to work. I'm using LTspice XVII for windows 10 to simulate a DC DC converter for about 3s (It is necessary to do ...
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1answer
98 views

LTSpice Consecutive Peaks

I'm trying to write a SPICE Directive that I can use to measure the consecutive peaks of an exponentially-decaying transient response but can't find any way to do so. I've tried adding RISE and TRIG/...
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18 views

Given a constant R,C, and the input voltage at any time, what is the output of a low pass rc circuit?

In other words, what is the transient response Vo(t) of any arbitrary input signal for a continuous voltage input Vi(t) for a low pass filter? We can make some assumptions: A for any given Vo(t), ...
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1answer
79 views

RC Circuit Transient Response

I was going through some questions on Transient Response of circuits. Then I encountered this question! Though, I was a bit confused at first, I initially approached in an intuitive way. My first ...
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1answer
64 views

Transient Voltage Suppression Diode with no current limiting component

BATT= 16V 27V Rated TVS Diode spec - TVS Diode Datasheet The circuit : My questions: I want to understand what happens when the BATT voltage goes above the TVS diode clamping voltage. For both ...
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1answer
39 views

Why is \$R_{eq}=0\$ ?and because the \$\tau=\infty\$.so in fact inductor is always in the Transient state and be charged?

There is a circuit,\$SW1\$ will be closed at \$t=0s,\$and \$SW2\$ will be opened at \$t=10ms\$ simulate this circuit – Schematic created using CircuitLab Now i know that when \$t<0s\$ and \$...

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