Questions tagged [transient]

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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
133 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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2answers
77 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
43 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
45 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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33 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
62 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
25 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
42 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
60 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
68 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
38 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
95 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 ...
3
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2answers
76 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
117 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
39 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
86 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
47 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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2answers
66 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
211 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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29 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
91 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
50 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
32 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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1answer
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
56 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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0answers
23 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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43 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
52 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
73 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
43 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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2answers
90 views

Why is the current for \$i(t)\$ \$5mA\$, not \$5e^{-\frac{t}{0.8m}}\$ mA?

Close the switch of the circuit, and it is in the steady state. We open the switch at \$t=t_1\$ suddenly. What is the value of \$i(t_1)\$? simulate this circuit – Schematic created using ...
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0answers
26 views

Variable Gain Amplifier (VGA) Cadence Simulation [duplicate]

I'm designing an Amplifier (VGA). I'm using Cadence CMOS 180nm technology. How can I find the power up time and power down time (1% of final current)?
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13 views

Transient voltage through an inductor in a step RL circuit

The current through the inductor in the above circuit is 2 A at t = 0- when it is short-circuited, since u(-t) = 1 for t < 0 and 0 for t > 0. At t = ∞ the current is 0 A, so I(t) should equal 2e^-...
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1answer
22 views

BIL, Dielectric Breakdown, Shrink Wrap, and Safety. Is there a resource for this information?

I am currently working with a system that produces high voltage transients for system testing, and have some cables that need to be made/modified to work with some new equipment. The operating ...
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35 views

How to get instantaneous voltages in everycircuit?

What i want to do is to add scope probes to nodes between resistors and then run a transient analysis for 5ms in order to see the measured voltages for those nodes at exactly 1.25ms. Is there any way ...
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1answer
50 views

How do I measure the duration of transient from a transient analysis graph?

I've assembled the following circuit: And the following graph is the output: (Green: Voltage across C) (Red: Supply Voltage) How do I measure the transient duration from the graph? Is it the same as ...
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2answers
37 views

Inductor Current Equation

i recently came across an exercise involving solving for the energy released in a freewheeling diode. This is the circuit: The problem is that i'm not understanding the current equations for the ...
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1answer
39 views

This clamping circuit output is -ve compared to what is expected?

Clock Pulse of Vpeak =10. Providing that the first cycle is -ve why does the output in first is -20 then 0 then -20 and so on? I expected it to be 0 and 20.
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3answers
140 views

Two charged capacitors connected in series

simulate this circuit – Schematic created using CircuitLab The circuit has the initial condition as shown in figure. What will Vfinal be when SW3 and SW2 are open but SW1 is closed.
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1answer
63 views

Which characteristic of a BJT determines the timing in the following given application?

I currently face a question about the BJT circuit given here: We see a 2N3904 transistor with constant base current of 2 mA. A switch seperates a 15 V/20 ohm source from the collector of said ...
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1answer
84 views

ESP32: Power rail transient when using SPI on battery

Working on a small datalogger project using an ESP32-WROOOM that involves an analog sensor signal being recorded and saved to SD card. Having a big power rail spike issue that has been isolated down ...
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2answers
110 views

What happens to the voltage across an inductor as the frequency increases? [closed]

My professor told us before that when DC is passed through an inductor and reaches t = infinity the element becomes open. How does this happen? By the way: the inductor has no charge at t = 0s.
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3answers
72 views

How to analyze a capacitor in series to a capacitor and resistor in parallel?

I would like to do a transient analysis on this circuit but I don't know how to use those formulas $$V(t)=V_0*(1-e^{\frac{-t}{R*C}})$$ $$I(t)=\frac{V_0}{R}*e^{\frac{-t}{R*C}}$$ in this case. There ...
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54 views

Are there any instruments that can be used to measure the stored energy across a capacitor?

Apologies if this a noob question but I was wondering if there was a way I could directly measure the energy across a capacitor in Multisim so that I can compare it with my analytical result.
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1answer
72 views

surge voltage characteristics of ceramic capacitors

I am reading a datasheet from Murata for a ceramic capacitor. According to the datasheet: When AC voltage or pulse voltage is applied, the peak-to-peak voltage shall not exceed the rated DC ...
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1answer
42 views

LDO transient performance enhancement circuit understanding

For the following LDO circuit, how does the transient performance enhancement circuit sub-block in green color works ?
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1answer
34 views

Fuse design for taking in account real-world very small transients

A bit of context I came up with this question after someone suggested that two fuses are better than a main one in the below configuration. The converters are SMPSs which regulate output voltage. ...

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