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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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Transient analysis of first order circuit

For the attached problem, I am getting the signs wrong.Here I have considered the inductor voltage signs as such because after closing the switch, less current would flow through the inductor but ...
lefty's user avatar
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Explination for arcing noise coming from protected power tap devices?

For years now there has been a random occurrence that happens with seemingly any power tap device I have with protection circuitry in it where it will make a audible buzzing/arcing sound for a few ...
Jacob Jewett's user avatar
2 votes
1 answer
86 views

Implementation of Circuit in AN104 for Load Transient Test

I have been testing the transient response of line regulator simply with a MOS and the resistor, this method, however, cannot generate arbitrary current and the current is not accurate. To improve the ...
cc Lau's user avatar
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3 votes
3 answers
155 views

What happens when you insert an inductor between Vcc and a MOSFET's drain?

Inserting an inductor in between Vcc and a MOSFET's drains can cause some very large voltage spikes, depending on the exact inductor value: I'm having trouble analyzing it properly, though. For some ...
SRobertJames's user avatar
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1 vote
1 answer
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Is there any issue when mixing low frequency power with high frequency digital in a single board? [closed]

Summary In a board is it okay to just join low frequency power(>10 Hz, 1-15 A, 24 V) with “high” frequencies(~100-480 MHz), being supplied by “different” power supplies but referenced with the same ...
Imeguras's user avatar
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1 vote
0 answers
16 views

Cannot get correct output in PSpice with the Buck Converter PSpice Transient Model from TI

I obtained the LM76005-Q1 transient model from the Texas Instrument website and imported it to PSpice. The website also provides a Design Calculator software, so I basically use it to determine other ...
Duc Anh Vu Trinh's user avatar
1 vote
2 answers
109 views

Transient circuit analysis with additional source

The circuit in the image below is what I get when I open the switch of a larger circuit which I have already analysed. Therefore, I know the initial condition. simulate this circuit – Schematic ...
GPWR's user avatar
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0 answers
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Standards/Insight into Transient Protection of Industrial/Construction Equipment

I am designing a device that will be connected to the 12 or 24V battery of certain construction and industrial equipment. I'm aware that because these are industrial vehicles/equipment we will need ...
Andy M's user avatar
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1 answer
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EFT on powersupply AC input

My system I use 110 V to 36 V power brick (medical grade), and having hybrid cable which takes this 36 V and Ethernet and goes to the system. I am testing the EFT as per 61000-4-4 (± 2 kV, 100 kHz ...
NICEGUY NICEGUY's user avatar
0 votes
5 answers
145 views

Is there an equation to calculate the voltage spike caused by an inductor in the absence of a freewheeling diode?

I am using a 50V DC power supply to supply an inductive load of 10mH (any kind of inductive load.) I am using a MOSFET as a low side switch. If I do not use a freewheeling diode to discharge the ...
Sudhanva Gokhale's user avatar
1 vote
1 answer
87 views

Hard time to understand building 250 V HV from 3.3 V and problem with transformer

I have built PicoEMP device ( https://github.com/newaetech/chipshouter-picoemp ) device which diagram I'm attaching: It's basic role is to built ~250 V voltage from 3.3V GPIO and release it through ...
nusch's user avatar
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2 votes
2 answers
107 views

Transient analysis in presence of faults

While reading Shenkman's Transient Analysis of Electric Power Circuits I came across the following problem: ... This circuit represents the equivalent of a d.c. supply network. At the instant of time ...
Awe Kumar Jha's user avatar
-1 votes
1 answer
65 views

Calculate the inductance voltage from its current time function

I have a solution for the following exercise, but I'm not sure if it's a good one. This is the current time function of the inductance: $$i(t) = 2-2e^{-t/T}\text{ (A)}$$ $$L = 10\text{ mH}$$ $$T = 2\...
Norbert Kts's user avatar
1 vote
0 answers
46 views

Control engineering: how to design a system for desired impulse response

I've designed a system to get a desirable step response. However, I think the impulse response of my system is more important. There are many methods for designing a system for transient response ...
Mr Phase Locked Loop's user avatar
1 vote
2 answers
107 views

Need help understanding transient inductive networks

When the circuit is in the storage phase is R2 shorted? My professor's PowerPoint shows R2 going away when the switch is connected to the circuit. Why is this? Will this be the same if R1 > R2? ...
Samuel Sutphin's user avatar
1 vote
4 answers
339 views

Voltage spikes on switch-mode power supply Vout when disconnecting barrel jack

I have a fairly simple circuit that uses a DC/DC converter (Traco TSR 1-2450E) to generate 5V for my microcontroller board (D1 mini or similar) from a 12V wall wart. I used the TSR 1-2450E because I ...
afflux's user avatar
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2 votes
1 answer
109 views

TVS Diode Transient Response to Surge and Current

I want to simulate the transient voltage response of a TVS Diode against a surge using an exponential voltage source with this characteristics: Initial value 0V Pulsed value 100V Rise delay time 0s ...
marcosbc's user avatar
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0 votes
2 answers
113 views

Step response v/s DC voltage

I have to find step response for this circuit considering my input as Vo and step for Vin( I am using Simulink for this) Firstly what i did was making this circuit (DC voltage is 1V) The response on ...
gagan chopra's user avatar
1 vote
1 answer
126 views

How to avoid transient voltage spikes when powering up a device?

I'm using the linear regulator LP2985-50 from TI to power a set of op amps (NE5532). The op amps provide an analog signal to a component that is very sensitive to overvoltages. Upon power up, I first ...
oscar garcia's user avatar
2 votes
1 answer
557 views

How to determine the maximum safe turn on/off time for a mosfet?

Background I have been considering using the VOM1271 photovoltaic gate driver with an N-channel mosfet to do simple on/off (no PWM) high-side switching of circuits up to 84V (previous question for ...
ScottyN91's user avatar
1 vote
2 answers
462 views

Energy in capacitor paradox

Recently I have been thinking about a circuits problem that caused me a lot of confusion. First of all we know from thermodynamics that energy is conserved. I wanted to show a problem that seemed to ...
Mora's user avatar
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0 votes
2 answers
329 views

Inductor in DC circuits

I've been studying about inductors lately, so I'm going to tell you how inductors work based on what I understood, please correct me if I'm wrong. As soon as the switch is closed (in a DC circuit with ...
Curious me's user avatar
1 vote
0 answers
25 views

What the correct way to find the transient equation of the latch circuit given below [duplicate]

So i have question i have found the transfer function for the of the given latch circuit, now i want to find the transient equation of the given transfer function, now i think the way i did this is ...
thehappywine's user avatar
0 votes
1 answer
97 views

Transient analysis with charged and uncharged inductor in series

I have to do transient analysis in the following circuit. When t<0. L2 inductor is effectively bypassed and 10A flows through inductor L1. At t = 0+ L1 behaves as a current source outputting 10A ...
rjpj1998's user avatar
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0 votes
3 answers
95 views

What's the potential difference across gap a and gab b

My book insists that the gap across a and b is the same, i.e 33.33V. But I made the circuit in a simulator and the simulator says the difference across gap a is 66.66V and the difference across gap b ...
rjpj1998's user avatar
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1 vote
3 answers
159 views

Transient response of capacitor connected to current source with no resistor

I have this HW problem: It has me completely stumped because the usual equation for the transient response of a capacitor assumes the circuit has a voltage source, not a current source, and requires ...
Mikayla Eckel Cifrese's user avatar
0 votes
1 answer
125 views

First order RC highpass filter input capacitance

I'm trying to find the capacitive load repreented by an RC first order highpass filter. Intuitively, I tend to believe the load will not be the C series capacitance, since the capacitor is not being ...
MPA95's user avatar
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1 vote
1 answer
49 views

51 V clamp on load dump; will this IC survive?

This is about the Texas Instruments TPS2HB50-Q1 40-V, 50-mΩ Dual-Channel Smart High-Side Switch. Vbb is the battery (suppy) voltage Page 7 gives a VbbCLAMP > 58V ...
kellogs's user avatar
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0 votes
0 answers
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Question of Ethernet PoE and TVS protection [duplicate]

My question is based on this question over here Asking this question here since I didn't receive a clear answer that clarified my confusions on TVS for PoE applications. As far as I understand, the ...
Freshman's user avatar
1 vote
0 answers
47 views

Compact Matrix representation for duplicate eigen values

For a diagonal matrix with diagonal elements equal to eigen values, I am interested to further use this matrix to carry out transient analysis using a numerical method (trapezoidal rule). There are ...
Dev's user avatar
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-1 votes
1 answer
156 views

Transient analysis of the low pass RC filter

I have designed a low pass RC filter and trying to simulate using transient analysis. I can't figure out the magnitude of the input and output waveform. What's the time delay between the input and ...
Davin Dempster's user avatar
1 vote
1 answer
67 views

Laplace transform of multiple sources in a circuit

I came across this circuit and couldn't solve it. From what I know the Laplace transform of a DC source would be the constant divided by the \$s\$ variable. However, does this only applies to sources ...
Alex Lim's user avatar
0 votes
2 answers
141 views

RC circuit simulation

I am trying to analyse a simple circuit of series-parallel RC in LTspice . V1 is a voltage source ramping from 0V to 10V in 1 second. I am expecting to see the constant current in C2 and C1 since ...
Ronnie's user avatar
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0 votes
1 answer
62 views

Transient current consumption of an opamp

How to select a voltage converter for a chip based on its input current? I know, that I should look for Isup in the datasheet. But what about pulse current? For example I have OPA4180 (four-channel op ...
dahaha's user avatar
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0 votes
1 answer
61 views

What is the capacitor charging equation for this circuit [closed]

The capacitor is charged to 20 V at time=0. Now it is connected to a battery of 80 V. What will be the charging equation. If the terminal are reversed it will be the discharging of capacitor-charging ...
cvcv's user avatar
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0 votes
1 answer
58 views

How could we predict the transient response of the multi-loop circuit?

Typically, when analysis the stability of a single loop circuit, we can use the open-loop method, just to break the loop and get the loop gain. Then, using the Bode diagram, we can easily get the PM(...
hideinink's user avatar
0 votes
0 answers
139 views

Output capacitor selection for buck transient response

I am trying to select an output capacitor for an open loop buck converter to meet undershoot and overshoot requirements for a step change in load current. Below is the equation to find the output ...
Dev's user avatar
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1 vote
0 answers
69 views

How to separate Transient and Steady-State Expression from Periodic Summation Response?

Background My question comes from here, it's a response of 1st order LPF RC circuit from an arbitrary periodic input. How to determine the transient response of a circuit to causal periodic inputs? ...
Unknown123's user avatar
1 vote
2 answers
78 views

Buck converter with input network

I am trying to simulate a Buck converter for load transient with and without input filter for duty ratio of 0.5, as shown below in LT SPICE. The output voltage transient is almost same for both the ...
ritvik rathore's user avatar
3 votes
1 answer
82 views

Transient Negative voltage on NMOS causing channel to open?

This is my first post here. I am an electrical engineer looking to cure my madness because a 2N7002 NMOS is doing things I cannot explain. If you look into the attachments, you will see some screen ...
jdavis's user avatar
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4 votes
5 answers
515 views

Why do these INA240 current shunt amplifiers keep failing?

We have over 100 current shunt amplifiers (Texas Instruments INA240A2-Q1 and INA240A3-Q1) monitoring durability testing of brushed DC motors (more specifically, fuel pumps). On our test boards, there ...
gtetil's user avatar
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0 votes
1 answer
57 views

Automotive transients: which rail goes how?

Presumably it would depend on each transient http://www.sft-lab.com.cn/uploads/ISO_16750-2-2010.pdf http://sft-lab.com/uploads/ISO7637-2-2011.pdf Or is there a more general rule - i.e. when a -100V ...
kellogs's user avatar
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1 vote
0 answers
232 views

Specifying a TVS to protect against inductive spikes

I'm choosing a transient voltage suppressor to absorb the freewheeling current from a 1mH inductor in the rare situation the output of a SMPS is disconnected during load. simulate this circuit –...
James Fotherby's user avatar
0 votes
1 answer
91 views

When finding ESR/ESL of a ceramic capacitor, what frequency should I assume during a load step?

I want to determine the output droop in a transient load step for a buck converter I am designing. The output capacitor will supply current during this load step, and there will be a drop associated ...
MaxwellEE's user avatar
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2 votes
2 answers
285 views

EFT generator circuit

I am simulating a circuit to model the EN 61000-4-4 waveform for electrical fast transients using LTspice. The idea is to have the generator for some in house testing. After a lot of back and fourth ...
DRF's user avatar
  • 536
0 votes
1 answer
157 views

Electrical fast transient waveform (switching circuit) load

I am simulating a circuit to model the EN 61000-4-4 waveform for electrical fast transients using LTspice. The idea is to have the generator for some in house testing. Here is an old question I have ...
DRF's user avatar
  • 536
0 votes
2 answers
131 views

Transient response for frequency dependent components [closed]

For a circuit consisting of R, L and C components, the component C is frequency dependent i.e. it's value depends on the operating frequency. I want to get a transient response for this system but not ...
ritvik rathore's user avatar
0 votes
1 answer
115 views

Current amplitude of an Electrical Fast Transient

I am trying to build my own EFT generator as close as I can to (IEC 610000-4-4). In order to achieve that I need to figure out the parameters of the waveforms that need to be produced. I am at a stage ...
DRF's user avatar
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0 votes
0 answers
32 views

Estimate transient power of crowbar circuit

I am designing a crowbar circuit and for this circuit it is important that the maximal transient energy that goes through the circuit before the fuse trips stays below a certain limit. The setup of ...
luukito's user avatar
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0 votes
2 answers
81 views

Discharge of steady state inductor

What happens to the energy stored in an inductor when it is discharged after it reaches steady state? In transient state analysis, the voltage in the inductor changes its polarity when discharged and ...
cvcv's user avatar
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