Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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.

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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Does switching on a bench power supply cause a voltage spike on its outputs?

In an Adafruit guide, it is claimed that bench power supplies may produce a voltage spike upon turn on: Source I cannot find any reference to this. My assumption is that their target audience (hobbiests) may have low quality bench power supplies,…
Anas Malas
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LTspice: simulating the bounce effect of a push button

I'm trying to reproduce in LTspice the switching response of a push button with bounce effect as shown on the second page of the SN015 Support Note by Würth Elektronik. Here is an excerpt: What I have tried to do is use two voltage-controlled…
noeld
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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 targeting \$<5%\$ overshoot and \$<2s\$ settling time. Currently, the overshoot criteria are satisfied. Note I know…
rrz0
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What Does 8 x 20-µs and 10 x 1000-µs Mean in Surge Testing Terminology

I'm trying to understand the meaning of 8 x 20-µs and 10 x 1000-µs standardized transient impulses (or sometimes it's called a waveform). But what does it actually mean. Why is there a multiplier in front of the time unit? The quoted line above…
Denz Choe
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Maximum limit on the Buck converter inductance value

I found the minimum inductor required for a buck converter using the following formula - $$L_1 = \frac{V_{in\,max} - V_{out}}{I_o \times K_{ind}} \times \frac{V_{out}}{V_{in\,max} \times fsw}$$ We usually take 40% buffer on the calculated…
user19579
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What is the physical model for energy flow in or around a lossless conductor during transient analysis? (Veritasium Electricity in Wires)

Context Veritasium - The Big Misconception About Electricity - Energy Doesn't Flow in Wires Note I do not agree with the answer (D) given by Veritasium which is only plausible if any tiny current whatever is sufficient to "turn on" a source of…
SystemTheory
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Handling Transient Currents on USB Powered Devices

I'm working on a USB-powered speaker design and could use some thoughts or design inputs from the community. The data part is pretty simple - USB powers an I2S bridge that talks to an I2S amplifer. The power, however, is more challenging because I…
Skateboarder
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Transmission Line Transient Response To Step Voltage Prior To Any Reflections

This question seeks a definitive and precise answer to a question regarding the transient response of a transmission line. Figure 10 of TI Application Note snla026a contains a graph showing (among other things) the current into transmission lines of…
Math Keeps Me Busy
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"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. Automotive environment, the drop is due to…
Alessio Sangalli
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Capacitor exploding in a paper plant

Two years ago I was in an internship in a paper plant in the Superintendence of Electrocontrol, in the area of maintenance of electrical equipment. Well, they had a problem regarding some capacitor banks that were installed to mantain the power…
dpalma
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Help tame turn-on transient

I'm working on a dual headphone amplifier. I've discovered that it has a pretty bad turn-on transient that results in a loud pop if headphones are plugged into the amplifier when it is turned on. The split positive and negative rails rise very…
strobot
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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 installing over 300 units in different places, I…
Carton_
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About SPICE: Should I use transient analysis or DC linear analysis?

My question is specifically linked to an exam problem where I had to find a function in terms of time for the current on a capacitor and a resistor. The circuit was very simple: A current time-variant current source in series with 2 subcircuits,…
Severo Raz
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How does a zero in transfer function affect the bandwidth of a system

Suppose we have a system with the closed-loop gain: \$\displaystyle G(s) = \frac{\omega_n^2}{s^2 + 2\zeta\omega_n+\omega_n^2}\$ Which is the default two-pole system closed-loop gain. Let's also assume that bandwith \$\omega_0\$ is defined with…
Vidak
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How do we calculate the sub-transient current (initial symmetrical short-circuit current)?

For the ease of understanding, I have divided my questions into two sub-parts: Per IEC 60909, the initial symmetrical short circuit current is calculated by: \$I_k"=\frac{cU_n}{\sqrt(3)Z_k}\$. However, it seems that determining the value of \$Z_k\$…
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