Questions tagged [transient]

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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
182 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
43 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
24 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
15 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
38 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 ...
1
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1answer
79 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
126 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
47 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
64 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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5answers
275 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
64 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
77 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
259 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
86 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
120 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
30 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
35 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
39 views

Measuring ac mains transient

How can I measure transients in AC mains? For example, after and before using a GDT or a MOV. The thing is, I don't have those expensive HV differential proves for the oscilloscope. And, if I use the ...
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0answers
106 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
137 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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1answer
124 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....
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3answers
370 views

LC Circuit LTSpice Simulation With Time Switch

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)=\...
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1answer
123 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 ...
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1answer
46 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 ...
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0answers
68 views

opamp simulation

Is the following open loop transient simulation of opamp correct ?
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1answer
168 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 ...
3
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2answers
171 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, ...
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2answers
85 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
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1answer
178 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 ...
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0answers
91 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: ...
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2answers
96 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 ...
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4answers
724 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 ...
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2answers
151 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 ...
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2answers
742 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 ...
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1answer
50 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 ...
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0answers
55 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 ...
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2answers
110 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) ...
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1answer
55 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 ...
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1answer
35 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 ...
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0answers
92 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 ...
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1answer
238 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.
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2answers
223 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 *...
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2answers
149 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 ...
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0answers
408 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 ...
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1answer
238 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 ...
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2answers
2k 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 ...
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1answer
159 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, ...