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Questions tagged [inductor]

An inductor is a two-terminal passive device that stores energy in a magnetic field.

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Modeling a short 10mm wire for RF

This is related to another question of mine looking for parasitics which need to be added to prevent oscillations in simulations . How should I model a short 10nH wire (say AWG 20 with 0.8 mm diameter ...
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Inductor selection for a buck converter with uncertain output current [closed]

I'm struggling to choose the correct value inductor for my design with a TPS54331. Based on my estimations, I calculated a DC current consumption of 1.3 A for my circuit, but sometimes the circuit ...
SajjSamm's user avatar
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Calculation of transformer inductance value

I am trying to find a way to calculate the primary and secondary inductance of transformer. I learned that it is changing from one topology to another. My topology is Phase-Shifted Full-Bridge ...
Mhan's user avatar
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Flyback Diode Forward Voltage

Using this link as reference. Question 1: From my understanding, if the applied forward voltage across a diode is much greater than its rated forward voltage the diode will potentially fail. Based on ...
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How does the leakage inductor distribute over multiple coupled inductors?

I am working in LTspice with a triple coupled magnetic inductor. I chose the factor of coupling to be 90%. L_1 is 1000uH so the uncoupled energy should be 100uH. How does the 100uH energy distribute ...
i33SoDA's user avatar
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LCR Meter U1733C "rn" Symbol Meaning

I have the Keysight U1733C LCR Meter and when I meausure inductance shows me the "rn" letters in front of the Henry units. Do you know what it means (on the manual I found only the SI units -...
DarkKnight's user avatar
3 votes
1 answer
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What is this component - 8 legged inductor?

I am having trouble identifying this component. Pretty sure it must be an inductor of some sorts but I have never seen an inductor before with 9 legs (8 of which are used). The 8 used legs have ...
wgthompson's user avatar
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3 answers
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Are inductors in resonant circuits dangerous? They produce very high voltages

A simple series LC resonant circuit has theoretically infinite voltage in the middle between L and C, if we assume 0 ESR and exact resonant frequency: \$V_{at LC junc} = V_{in} \frac{X_{C1}}{X_{C1}-...
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What is the function of the inductor in this Bluetooth audio module?

I found the circuit below for a Bluetooth sudio module that included a 100 mH inductor in series and then a 10 uF capacitor in parallel to the power input. Image source: Iranian electronics seller ...
adam_Barfi's user avatar
2 votes
3 answers
261 views

Why inductor don't discharge completely even when the duty cycle is 50%?

1] My simple buck convertor circuit description I made this buck convertor on my breadboard- Falstad simulation The battery voltage is 12 V And the MOSFET is a N-channel enhancement mode MOSFET The ...
in.yssh's user avatar
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1 answer
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Are there safety concerns with hooking an inductor to a MOSFET and generating 85V spikes from a 9V source?

Are there safety concerns with hooking an inductor to a MOSFET and generating 85V spikes from a 9V source? Looking at the circuit below, I can generate this from a 9V battery. Is this safe? It's on a ...
SRobertJames's user avatar
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What happens when you insert an inductor between Vcc and a MOSFET's drain?

Inserting an inductor in between Vcc and a MOSFET's drains can cause some very large voltage spikes, depending on the exact inductor value: I'm having trouble analyzing it properly, though. For some ...
SRobertJames's user avatar
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Connecting the LC circuit to dc voltage source without transient

Let's say I have following circuit where the transistors are controlled via a software in the microcontroller. I have been looking for a control algorithm how to achieve a state when both of the ...
Steve's user avatar
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4 votes
7 answers
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Freewheeling diode in a capacitor

I hope this is not too trivial a question. I know that a freewheeling diode is connected across an inductor to eliminate the sudden voltage spike that occurs across an inductive load due to ...
KaleM's user avatar
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Energy stored in a saturating inductor

We all know that the energy stored in an ideal inductor is \$E=\frac{1}{2}LI^2\$. However, real inductors with a ferromagnetic core don't have constant inductance. Particularly, when a specific field ...
AnttiP's user avatar
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Inductance after core saturation

Looking at the datasheets of some drum core inductors, at higher currents the inductance drops significantly due to ferrite core saturation. But it seems inductance asymptotically approaches a value ...
ac47's user avatar
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Does the rise time equal the decay time in a DC LR circuit?

The time it takes the voltage to decay from its maximum to zero after the switch is closed is ≈5\$\tau\$. I was wondering, does the same applies during de-energizing, i.e, when the switch is connected ...
Jack's user avatar
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2 answers
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Would thermal vias under an Inductor be effective at dissipating heat?

I'm designing a BMS board that will be capable of charging my 1S2P battery back. I'll be using the 21700 Li-Ion cells, which will mean my batter pack will have a total capacity of 10000 mAh. The ...
J. Street's user avatar
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2 answers
54 views

Are \$v_{C}\$ and \$v_{L}\$ in phase in an LC oscillator?

Looking at these figures, I can't help but to conclude that \$v_{C}\$ and \$v_{L}\$ are in phase! Why? Well, because \$v_{C}=q/c\$ I know this is wrong but why? Reference: https://shorturl.at/30NEu
Jack's user avatar
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3 answers
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When selecting an inductive device in the matching circuit of RF, how to consider the self-resonant frequency of the inductor? [closed]

I want to select a series of inductor of Murata for the component of matching circuit in my UWB product(6.5GHz~8GHz) . But ,I didn't find a suitable series whose Self-resonant frequency is all bigger ...
Liam zhai's user avatar
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How can current still exists as t approaches infinity in RL circuit

The textbook solution for \$b)\ (\ i_{o}(t),t\geq 0\ ) \$ is $$\ 1.25e^{-1500t}-1.25A,$$ but as \$t\$ approaches infinity, the current will be \$-1.25A \$ for \$i_{o} \$. How can this be possible, ...
sat's user avatar
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6 votes
3 answers
571 views

Why does a power inductor make a loud noise when first turned on then decay to a calmer "hum" later?

I'm puzzled by this phenomenon. According to my lacking knowledge, a huge current draw at startup is exclusive to electric motors, where the lack of back EMF at zero speed causes big current draw. So ...
Ömer Gezer's user avatar
1 vote
1 answer
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What is the purpose of the base inductor on this Class C amplifier?

This Pixie III 7 MHz transceiver uses Q2 as a Class C amplifier. What is the purpose of L1? The article only says The value of RF choke L1 is not critical. Since little current passes through it ...
SRobertJames's user avatar
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2 votes
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How does this boost converter circuit work?

The circuit appears on this site in Post #45 by Michal Podmanicky. It is posted so that I can understand how the circuit works. It is not explained fully in the posted link. How does this circuit ...
hhsting's user avatar
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effect of drain inductor of LNA on swing

i have a problem with putting an inductor in drain of an LNA if we put an inductor it would be short circuit in DC so it would not have any swing and it can not properly amplify our input signal and ...
amin mokarami's user avatar
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1 answer
60 views

Power consumption in AC circuit

In a purely resistive circuit, maximum power is consumed. Why? Because, we say, current and voltage are in phase. While in a purely inductive circuit, power consumed in a cycle is zero. Because, ...
KeShAw's user avatar
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1 answer
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Mutliple series inductors instead of single inductor

For the larger package size and slightly better SRF and Q I would prefer to use 3 series SMD inductors instead of the only 270 nH SMD I can find with the required Q. Also I would avoid winding my own ...
kellogs's user avatar
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1 vote
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Is there a standardized process for Inductor selection calculation for boost LED controllers?

Through numerous datasheets that I've gone through in selecting an LED controller to use, I've come across two different methods that are used to estimate the needed inductance: Based on the ripple ...
roaibrain's user avatar
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3 answers
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Inductance Computed As Length in Historical Document

In "Formulas and Tables for the Calculation of Mutual and Self-inductance.", many equations compute the inductance of an arrangement as a length. For example, Equation 95, on p. 150, states,...
Terry's user avatar
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RL parallel circuit

This problem is available on MIT coursware assignements 9. Knowing that I(t)=4-10u(t) mA; R=1 kOhm; L=1 mH I want to find: a)IL(t=3.00E-06 s) b)V( t=3.57E-07 s) c)IR(t=1.90E-06 s) V is the voltage at ...
Broa's user avatar
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1 answer
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Preventing spikes in inductor current (probably) caused by lab power supply

As part of a university project I'm trying to produce a current through an inductor (610uH), that'll eventually be used as a solenoid. I'm producing this using a PWM voltage produced by a TI GaN ...
Emerson SD's user avatar
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Equivalent inductance seen from a winding

I would be having a little trouble understanding how to do this problem of magnetic circuits. It asks me to calculate the equivalent inductance seen from winding N2. I know how to calculate the ...
WalBol's user avatar
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1 answer
149 views

Same formulas give different answers [closed]

Practice Problem 6.66 from Fundamentals of Electric Circuits, Sadiku and Alexander Q. The current i(t) through a 20 mH inductor is equal, in magnitude, to the voltage across it for all values of time. ...
Farhan S's user avatar
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How to derive a generalized equation with respect to time for voltage across the inductor & current in an RL circuit with a DC PWM source?

Circuit connection: I have this resistor (96 Ω)-inductor (990 µH) circuit connected to a PWM source of frequency 62.5 kHz; And ...
in.yssh's user avatar
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13 votes
3 answers
2k views

Why does a motor or ceiling fan exhibits low torque after capacitor-to-inductor swap?

For quite some time, I have been curious about what would happen if I replaced the capacitor in my ceiling fan with an inductor. Here in India, we usually deal with a mains voltage of about 220 - ...
15 Volts's user avatar
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2 votes
2 answers
84 views

How do ideal inductors dissipate high frequency noise?

I'm confused about the behavior of ideal inductors. As I understand, inductors provide a high impedance towards high frequency signals, which greatly reduces the noise. How is the reactive energy lost?...
EErocks's user avatar
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1 vote
1 answer
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Understanding AM/FM stereo receiver schematic

I am working on a parts list to build a AM/FM Stereo receiver (see https://electronics-diy.com/pdf/TEA5711.pdf). It's a design from Phillips Electronics using the TEA5711 IC. It was published in ...
Don Wilson's user avatar
3 votes
6 answers
1k views

What is an intuitive explanation on how a buck and boost converter transfer energy?

I can understand how a buck converter can step down the voltage but only with the formulas. I am struggling to understand intuitively how the inductor stores energy and releases it in a way so that ...
Albert's user avatar
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0 votes
2 answers
85 views

Self Inductor - Where do I go wrong when calculating the EMF?

I have the following problem : I have a self inductor L. Its characteristics are L = 10uH and R = 12Ohm. If a current I = 200mA DC goes through L at t = 0 decreases to 1mA in 100ns, what would be the ...
R Strem's user avatar
1 vote
1 answer
84 views

I need to identify this component - flat, grey, 4 terminals, 8.9 x 5.6 x 2.5mm

I need to identify the component in the picture. In the circuit it is between the GND that arrives at the PCB and the GND that goes to the components, while the other side is between the VCC that ...
GustavoSBelote's user avatar
1 vote
2 answers
132 views

Is it better to use a NTC or a MOSFET to limit inrush current [closed]

I need help to design a circuit to limit the inrush current to a simple motor controller for a 36 V, 250 W motor on an ebike. When turning on the battery to the controller there is a very large inrush ...
robert rj m's user avatar
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1 answer
33 views

Measuring the current in a LL circuit with a AC source, doesn't work, i always get this error when i start the simulation, Proteus ISIS

When i click to simulate, it always shows up with this error and it fails '''[SPICE] singular matrix: check node #L1#branch. ▲[SPICE] singular matrix, check node #L1 #branch. ▲[SPICE] Gmin stepping ...
fireBreaker_2007's user avatar
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0 answers
28 views

Using a coupled inductor in a multi phase buck converter - how to set the inductor dot notation and converter PWM for best ripple reduction

Based on these Charles Sullivan papers, we can use a coupled inductor in a multi phase converter to reduce inductor ripple current. https://www.princeton.edu/~minjie/files/sullivan-CICC-2021.pdf http:/...
Windquest's user avatar
1 vote
0 answers
42 views

Why is the back EMF subtracted from total voltage instead of the voltage across the coil component?

I understand all of this question except for the very end. It is from a test I was looking at from a couple of years ago. A coil consists of 150 turns of wire and has a total resistance of 200 Ohm. ...
hoff's user avatar
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1 vote
0 answers
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Why is this considered "BAD" layout for an inductor

I want to know if this is a "BAD" way to route an inductor that is applied in a SMPS. From my understanding (which could be wrong) the fields will look like this: As per the Top and Bottom ...
JoeyB's user avatar
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3 answers
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Is there any capacitive and inductive reactances in an LC circuit without an AC source?

In a pure LC circuit that is left to oscillate at its natural frequency without any AC source, would there be any \$X_L\$ or \$X_C\$? I don't think there is any reactance in such a circuit, because ...
Jack's user avatar
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0 votes
3 answers
94 views

Inductor circuit model

I'm looking for a equivalent model of an inductor with Rac due to skin effect. What is the equivalent schematic? I found two of them, is it the first one or the second one which is correct? Does is ...
exolune's user avatar
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3 votes
1 answer
202 views

Inductor magnetic field collapses during switching?

SEE EDITS BELOW I'm running into some problems with my Buck converter design. During the switching period the inductors magnetic field seems to collapse, which generates some large voltage peaks. That'...
Daan32's user avatar
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0 votes
1 answer
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Should I limit inrush current of this MOSFET buck regulator?

I am building a digitally controlled constant current switching power supply. This circuit will deliver no more than 105 Watts at around 20V from an AC-DC DIN rail SMPS of 250W. You can see and ...
uSD_cardlord's user avatar
1 vote
7 answers
412 views

Why is it said that inductors block AC?

I have understood the concept that a capacitor blocks DC and allows AC, but how does an inductor block AC? Suppose I connect the inductor in an AC circuit. I am still able to read the current at the ...
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