Questions tagged [transient]

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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
34 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
28 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
29 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
52 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
22 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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25 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
42 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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0answers
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
65 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
26 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
89 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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0answers
34 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
35 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
132 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
60 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
81 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
66 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
71 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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0answers
53 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
61 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
41 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
33 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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4answers
200 views

What's the correct sequence to start thinking about a BJT circuit

A very basic circuit as shown below, the 1V step voltage is applied @ +1V @ t=0. Edit: Unfortunately the entire question was asked based on a wrong assumption, ...
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0answers
46 views

USB Charger Voltage Specification - Transients

Is there a specification for a USB charger that discusses whether voltage transients are acceptable, is if so, under what conditions? Specifically, I know a USB charger needs to have a voltage of 5V +...
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2answers
51 views

Problem with transient on power rails

I have an AC to DC converter that outputs 5V. I then run this into 2 regulators on my board. The 4.2V regulator goes into a cellular module, and the 3.3V regulator goes into a microcontroller. I ...
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1answer
27 views

Inrush current and number of devices per MCB

I'm looking at some LED drivers meant to be powered by the regular mains voltage (230V). The datasheet specifies how many drivers can be connected to a single Miniature Circuit Breaker (MCB) on ...
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0answers
16 views

Lead compensator vs pd controller?

I have already studied that lead compensator is apparently similar to pd controller for both improve transient response But how can we decide?which one to use?
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1answer
39 views

Include TVS in low current battery powered circuit?

I'm designing a circuit powered by two alkaline cells in series with a voltage of 2-3.2V. After being fused this is going through the boost converter MCP1640B with constant 3V3 output. The maximum ...
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1answer
106 views

Deep explanation on TVS diode voltage suppression?

I am looking for a deep explanation on why a TVS diode suppresses voltage. All of the research I have done on Google just says 'it suppresses voltage by shunting current', but this doesn't make sense ...
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1answer
158 views

Mechanical Switch Causes Transients from AC-DC Power Supply

I'm having trouble getting rid of output transients from this Mean Well PSU right after the AC input is switched. https://www.meanwell.com/Upload/PDF/RPS-500/RPS-500-SPEC.PDF The PSU is a RPS-500 ...
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1answer
50 views

Simple circuit with an inductor in transient state

I have a problem with this circuit. I am supposed to calculate i(t) at the moment t=(0+). The parameters are:R=300Ωe(t)=12VL=0.1H Switch is closed at t=0 I know that current can't jump in the branch ...
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0answers
65 views

Arcing contacts corrupt communication. What to do?

I have a robot with external charging contacts and a docking station with exposed pads this robot has to drive into to start charging. When trying to dock and charge I seem to get a lot GND bounce, ...
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6answers
318 views

“Temporary boost” supercap

I have a 12VDC load (up to 10A) that functions correctly down to 8VDC. Sometimes (frequency: many seconds max, many minutes typical) the power source has a very brief (few milliseconds) drop to 7V. ...
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0answers
71 views

Does this circuit, used to subtract capacitive responce, have a specific name (picture in body)?

What I'm doing: I'm applying voltage pulses to thin films and measuring the resulting current transient, then using these transients to extract the hole mobility. The problem: When the films are ...
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0answers
98 views

How to determine the transient response of a circuit to causal periodic inputs?

As you know, analyzing a circuit with phasors provides only the steady-state response, and is only useful for sinusoidal signals and DC signals. Fourier series allow us to analyse a circuit with ...
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3answers
477 views

Voltage Drop due to inrush current

When an air-conditioner is switched on, light bulbs in the house flicker a little. I was told that this is due to the inrush current of the ac. I am assuming that voltage drop is causing the ...
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2answers
115 views

What is the voltage across the capacitor 3ms after the switch is closed

I have this circuit: This circuit is working for a long time like this, with the switch open. So, the circuit is stabilized and the voltage across the capacitor is 40V. At t=0, the switch is closed. ...
2
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1answer
142 views

Massive pk-pk ripple on output using isolated DC-DC converter module

I'm having a very odd issue using an integrated DC-DC isolated converter module. As the module stabilizes, a massive pk-pk ripple is developing on both the output and the input. At first we thought ...
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0answers
49 views

How to do Transient analysis?

Consider the above example earlier I used to form a differential equation and then do its solution using Laplace,but for this example the differential equation comes out to be non-ordinary. Please ...
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1answer
31 views

Dual transient voltage supressors

I've been trying to reverse engineering a monitoring system and there's a component that I can't understand. What does these Z symbols represent?
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1answer
39 views

Transient Response question. I want to know why during t>0, the voltage source has been short circuited?

Can anybody please explain why the voltage source has been short circuited here after the switch has been closed at t=0. Thank You.
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0answers
132 views

Radio module resetting when fluorescent tube switched on/off

I have a PCB powered by an IRM-30-12 power supply (230VAC to 12VDC). On this PCB, I have a MRF24J40MD from Microchip and a Udooneo to drive it + a 5VDC regulator and the 3.3VDC of the Udooneo. After ...
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1answer
168 views

Preventing op-amp output fluctuation at power-off event

What methods exist to place the outputs of an op-amp in a fixed state when power is removed? I have a circuit that uses an LM324 to process an analog input signal. As shown below, the input signal ...

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