# Questions tagged [transient]

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2answers
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### Buck regulator transient response explanation

I am using TPS5450 buck regulator and trying to measure the transient response but seem to see a weird triangular adjustment before it settles. I can't see anything in the datasheet that would explain ...
1answer
38 views

### Independent and dependent initial conditions

Consider the RLC circuit below. In fact, it is a normalized filter with Butterworth approximation of 3rd order. Now suppose that for some reason I am interested in the time domain formulation. Using ...
1answer
51 views

### Books on network theory [closed]

I really want to know which books should I read to learn the subject- Network theory in electrical engineering. I know there are some popular books out there in the market, but I will really ...
2answers
121 views

### How to find current through inductor when connected in series with an ideal diode?

Please help me with this simple circuit, which is creating lots of confusion due to different results from theoretical calculation and SPICE simulation. Ques: In this circuit switch is closed for time ...
1answer
45 views

### TLV431 based voltage regulator, possibility of exceeding Vka max. at startup

I need a small (15mA max.) voltage regulator and considering a TLV431 + emitter follower: This works fine but the datasheet states Vka as 7V absolute max. My input voltage Vi however can be as high as ...
0answers
64 views

### Why is my Pi Pico resetting from HDMI hotplug (transients question)

Why exactly is my Raspberry Pi Pico (MCU) resetting during HDMI hotplugs with my simple HDMI signal sniffing circuit? Although the solution to this is obvious, I'm curious as to exactly what's ...
1answer
46 views

### Input transient voltage of a regulator

I am using a regulator in a design. The regulator gives 5V output with 9V to 60V input. The datasheet says that the input transient voltage is 80V/second. Does this mean the regulator can handle an ...
3answers
72 views

### Voltage and current during the first cycle of RL circuit

I have a simulation of RL circuit connected with an ac source. Any one can tell me please that why the peak of the current during the first positive half cycle is higher than the peak of current ...
2answers
54 views

### Circuit for simulation

Can someone please help solving for my circuit connection, I'm new to this and somehow didnt manage to simulate the circuit correctly as the software stated this Warning: Inductor-voltage source loop ...
4answers
109 views

### Transients in series RL circuit with AC source

Why the transient current will die off in series RL circuit with AC source ? Every time the ac voltage source reverses direction so does the current and the current has to pass through the same ...
0answers
11 views

### Coupled current in shield in a tube from a transient surge

If a shielded cable (B) is running inside the centre of a tubular structure (A), how is the coupled current from a surge estimated in the shield? I am trying to figure out how the coupled current ...
1answer
31 views

### What would cause DC bus voltage on my VFD when the disconnect is off

125 hp 480 vac HMax VFD. Controlling a pump motor. Motor is not spinning and line to the VFD is disconnected. I was putting the output wires back on the VFD, when moving the second one into place, ...
0answers
39 views

### The transient instantaneous power dissipation of an impedance

Suppose we have a resistor of value R in parallel with an inductor of value L with series resistance R. The impedance of the network is $$Z= R\frac{sL+R}{sL+2R}.$$ simulate this circuit – ...
1answer
64 views

### Artifacts in transient analysis

Is there some rigorous treatment of convergence issues in transient analysis? I am using LTSpice. In transient analysis with maximum time-step is used. Fundamental oscillatory frequency of analysed ...
1answer
42 views

### 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....
1answer
39 views

### 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)? ...
1answer
58 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, ...
0answers
40 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?...
1answer
74 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 ...
0answers
31 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 ...
0answers
199 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 ...
1answer
40 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 ...
0answers
89 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 ...
1answer
146 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 ...
3answers
81 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 ...
1answer
61 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 ...
2answers
63 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 ...
2answers
290 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 ...
2answers
93 views

### Small signal digram

According to this figure how to get qeuation(7)and(8)
0answers
58 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'...
1answer
128 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. ...
0answers
51 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 ...
2answers
688 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 ...
2answers
88 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 ...
1answer
53 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. ...
1answer
77 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 ...
0answers
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 ...
2answers
134 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 ...
0answers
133 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, ...
1answer
54 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 ...
1answer
105 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 ...
2answers
376 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 ...
2answers
256 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 ...
1answer
134 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 ...
2answers
84 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 ...
2answers
213 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 ...
1answer
52 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 ...
2answers
152 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 ...
1answer
76 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 ...
2answers
646 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 ...