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Questions tagged [transient]

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4
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0answers
62 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 ...
0
votes
1answer
66 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 ...
0
votes
1answer
39 views

What is difference between natural response and zero-input response of a system and how to find natural response?

In most books it is said that natural response is another name to zero-input response while in some resources is is mentioned that the classification is based on poles of transfer function and input....
0
votes
3answers
98 views

LC Circuit LTSpice Simulation

I'm sorry if this topic isn't adequate for the forum. Does anyone know how can I make this LC circuit simulation for \$v_{c}(t)\$? The original circuit is the one shown in the figure. \$v_{C}(t)=\...
2
votes
1answer
112 views

Large blue arc from capacitor when shorting it - how deadly was this situation and how much energy was inside?

I was working on a transient circuit and I applied a 8kV, 2 ohm voltage transient on its input with a rise time of 10us and fall time of 50-100uS. It comes from a transient generator off mains so can ...
0
votes
1answer
39 views

Eliminating power-on state changes caused by input signal fluctuations

I have a circuit that uses several comparators to read an analog input signal and control some downstream digital logic. When the device powers up, the logic states fluctuate because the input signal ...
1
vote
0answers
51 views

opamp simulation

Is the following open loop transient simulation of opamp correct ?
0
votes
1answer
47 views

What's wrong with my RC circuit transient simulation in Cadence Virtuoso?

I am trying to do a simple RC transient simulation in Cadence virtuoso. Please see the circuit below: I am trying to see the transient current and voltage of the capacitor being charged,however I got ...
2
votes
1answer
57 views

How to determine the steady state voltage across two capacitors in parallel

Say we have two capacitors C1 and C2, initially isolated from each other and each having an initial voltage Vc1 and Vc2 respectively, where Vc1>Vc2. When suddenly connected to each other in parallel, ...
0
votes
2answers
53 views

voltage transient protection for MV Motors

What types of transient voltage protection is applied on medium voltage motors and are these types of protection that are applied depended on the type of motor it is e.g Synchronous vs Induction motor?...
3
votes
1answer
73 views

How does this isolation transformer protect user from transients/mains?

I'm looking at a pretty simple overvoltage/transient protection circuit designed to protect users but I don't understand what the transformer is doing. The circuit is designed to protect the output ...
0
votes
0answers
45 views

KVL in the capacitor during transient analysis

I can see that this topic has been discussed many times in this site. But I still can't figure out why I am still not getting my correct equation applying the KVL. Consider a circuit as shown: ...
-1
votes
2answers
86 views

How to tackle circuit containing time variable resistor?

simulate this circuit – Schematic created using CircuitLab For instance above schematic find current as function of time in circuit above I studied it about months before and am not able to ...
0
votes
3answers
147 views

LTSpice: How to offset the start time in a transient simulation?

I see how to set the total run time for a transient simulation, but what if I didn't want the simulation to start at 0s? For example, if I have two voltages sources that are stepping at offset times ...
0
votes
2answers
146 views

Capacitor Voltage during Transients

I am starting to learn transient analysis series RC which requires our own equations to be derived, but I don't understand how the voltage across the capacitor is given in the equation below from a ...
1
vote
0answers
63 views

Choosing an Automotive Fuse with ISO 7637-2 (Pulse #1 24v system) in mind … -600v Transient

In designing a input power protection circuit in an automotive application with a 24V power bus, how does one deal with the -600V transient described in ISO 7637-2 Pulse #1: In particular, I'm ...
12
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0answers
533 views

What is causing this long tail in the transient reponse?

I have a fifth order transfer function for which I designed a controller using pole-zero cancellation technique on a root locus. I am after <5% overshoot and <2s settling time. Currently, the ...
1
vote
1answer
48 views

Significant low frequency content from digital oscilloscope measurement

I have been using a digital oscilloscope to measure a fast transient signal and have then processed the data in MATLAB. Performing an FFT on the data I consistently see a significantly large low ...
0
votes
0answers
31 views

Multisim Transient time point did not converge (peak detector circuit)

I'm building a peak detector circuit with mcp6002 op amp. The signal is 8k Hz 20%dc square wave filtered through a low pass filter whose capacitor varies between about 10pf to 1000pf. The schematic is ...
0
votes
2answers
62 views

Howto debug ngspice error PPerror: syntax error during transient analysis

In an effort to better understand software and how my computer actually works I have been experimenting with simple electronic circuits. I am working up to having three two bit registers (A, B, C) ...
0
votes
1answer
54 views

1st order circuit analysis

I'm having trouble with this exercise which I don't have a solution for, I'm used to dealing with simpler 1st order RL or RC circuits. Mostly I'm a little confused with the sinusoidal generator and ...
0
votes
1answer
28 views

LTSpice transient analysis and current amplification problem

Im simulating LC circuit in LTSpice: It's tuned at resonance at 1 MHz in the transient response simulation plotting the source and R1 current. Both of which are equal in amplitude 600mA but with a ...
1
vote
0answers
56 views

Superposition theorem for transient analysis

Can we apply superposition theorem in transient analysis of circuits? I don't think it can be used since during transient state the input and output relation is not linear and is rather explained by ...
0
votes
1answer
79 views

how do i know if Vc(0+) or Vc(0-) is zero?

i mean like in this picture, why is Vc(0-) = 10 v? why isnt it =0? when do i decide that there exists a voltage there even though it was in steady state? im not completely getting it.
0
votes
2answers
133 views

Derivation of time constant for single source, single capacitor RC circuit

Take a circuit comprised of resistors, a single capacitor, and a single step response voltage source. Then: Every single voltage and current in the circuit, except at the voltage source, will have a *...
1
vote
2answers
49 views

RC circuit with sinusoidal voltage - initial behavior?

For a simple RC circuit with a sinusoidal voltage source, the differential equation is: $$\frac{dq}{dt}=\frac{sin(t)}{R}-\frac{q}{RC}$$ When I plot the solution to this differential equation using ...
1
vote
0answers
391 views

Pulsed DC, kA range inductive transient protection method

I would like to design a transient protection solution for HVDC_pulse_unit. HVDC voltage = 3500V , current > 40kA. Events: D1 flyback diode survives(50kA surge forward current). MOVs section did ...
1
vote
1answer
145 views

Simulation result of bjt cascode amplifier

I use square wave as the input source to my BJT cascode amplifier. However, I got my output voltage as I used transient analysis in PSPICE to obtain the simulation result. Can someone tell me whether ...
0
votes
2answers
473 views

Transient analysis of square wave using PSPICE

I need to do a transient analysis of my BJT cascode amplifier. I was asked to use VPULSE as the source. I need to set VPULSE for +-10mV, 50% duty cycle square wave at 128 kHz with rise time and fall ...
0
votes
1answer
105 views

LTspice parametric sweep: how to force the simulator to continue with the next step?

I'm running transient simulations as I am sweeping a couple of parameter values (resistances, capacitances) to give a first hint about what range of values make a certain circuit stable. In addition, ...
1
vote
2answers
138 views

Is this optocoupler front-end safe?

This is a follow-up to Is this line detector safe? I'm re-designing the front-end based on some great feedback from the community. I've decided to move to the following topology: The phase of the ...
0
votes
1answer
331 views

Laplace transforms for transient analysis

simulate this circuit – Schematic created using CircuitLab For t<0 the switch is opened. Att=0 the switch is closed. ...
0
votes
1answer
80 views

How to protect LEDs from high voltage during NPN transitor transitions?

I am using a 555 timer and an NPN transistor to drive an array of 12 LEDs from a 9v battery, and a potentiometer to control the duty cycle. I am concerned about the voltages the LEDs will be subjected ...
0
votes
1answer
56 views

Trying to understand the transient current equation on a RLC circuit

I am reading this doc I see this magic happening on the third line of equations... How in the name of Math, does this \$ Ae^{st} \$ appeared there? Magic?
1
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0answers
79 views

Transient Response Suppression

In my project i am using an ultrasonic transducer. The transducer has a high Q-factor so that it's zero input transient responses decay rate is quite low and i am suffering from that because the ...
0
votes
2answers
120 views

Simulating all transient solutions for RLC series circuits

I am reading this page that contains the transient solutions for RLC series circuits: over-damped, critically damped and under-dumped. This site presents these graphics for the 3 cases: Then I have ...
3
votes
2answers
121 views

Inserting an unused voltage source in LTspice messes up transient results

This took me three days to figure out. Consider this simple circuit in LTspice: Looks pretty innocent. The output is a 1V sine wave, as expected. Going to View->FFT, setting number of data points to ...
3
votes
1answer
85 views

Transient Current Effects from Independent Charging Circuit

I've been working to automate a household appliance. The device is normally controlled by a switch that must constantly be depressed in order for the device to operate. Instead, I replaced this ...
0
votes
3answers
219 views

Why do we use Laplace transforms to analyse transient circuits?

I just learned transient circuits and we solved them both in the time domain and the Laplace domain and I can't understand why we would use the Laplace domain as it seems it is a lot more simple to ...
0
votes
1answer
41 views

transient noise plot in virtuoso

I was simulating a transient test on an SRAM cell, added a transient noise of 1-30MHZ frequency with 100 multiple simulations and calculated a VQ-QB graph(dots). I want to be able to only plot the ...
0
votes
1answer
46 views

Transient of a circuit when a generic audio signal is applied

I know the importance of the behaviour of a circuit when a sinusoidal signal is applied: by using Fourier Transform, I can see a generic signal as a (continuous) sum of sinusoidal signals with ...
0
votes
1answer
173 views

Mesh Current Method Circuit Analysis For AC Transient and Steady State Solution of RL Circuit

Hi everyone, I'm trying to find the currents through each branch for the above circuit using mesh current method (as I don't really know how else to do it), and end up with two simultaneous ...
2
votes
1answer
74 views

What is the time constant L/R of this circuit?

I've solved this circuit but i got some issues about the alternatives. English question at this picture: Switch \$S_1\$ had been closed for long time and after that \$S_2\$ was opened. Therefore, ...
0
votes
2answers
170 views

AC analysis on transient model of Buck converter

I'm unable to understand why can't we run AC analysis on a transient model of Buck converter.
0
votes
2answers
412 views

Transient analysis of op-amp circuit

What is the expression of V if V(0) = 4V? simulate this circuit – Schematic created using CircuitLab I am unable to proceed further after forming the following equation: -v/R1=(v-V)/R2+C1dv/dt
0
votes
1answer
47 views

Analysis of simple RC circuit

For the above circuit, Natural response will be A×exp (-t/RC) where A is any constant. For forced response, capacitor is open circuited consequently, 10K resistor is also removed and thus, forced ...
2
votes
2answers
159 views

How to solve a boost circuit (or any switched RLC circuit) in time domain?

I need to model a boost circuit with the following topology: simulate this circuit – Schematic created using CircuitLab I am interested in the resistor voltage, so I found the differential ...
1
vote
2answers
108 views

Transient analysis with Laplace and nodal analysis error

Have the schematic: Solving using MathCAD: There is an error in my equations with nodal analysis but I can't find where? May anyone help me? I also add the solution using approach of series RLC ...
1
vote
1answer
216 views

Circuit with sinusoidal voltage source - transient analysis

I've got this circuit(where u(t) should be calculated in t=3ms): Where:e(t)=260*cos(wt+25), w=2400 s^-1, Ro=15 ohm, R1=40 ohm, L=12 mH, C=20uF, t1=3ms. I've got huge problem to form equations (...
0
votes
1answer
148 views

Preventing power supply startup transients

I am trying to build a huge array of WS2812b's and the wiring is all done. Now, I am in the process of installing it into it's final destination. However, I have read that these WS2812b LEDs are very ...