Questions tagged [inductor]
An inductor is a two-terminal passive device that stores energy in a magnetic field.
2,212 questions
-2
votes
0
answers
68
views
What are these components, how to find an equivalent [closed]
The pinout of the components is non-standard. Help me find them. Equivalent.
N05 T with non-standard pinouts (N-E-MOS)
The classic "N_х" doesn't fit by pinouts.
Recommend a resource, similar ...
- 1
0
votes
3
answers
140
views
Can a frequency difference of around 100Hz affect the value of the internal resistance of an inductor?
I used a Pasco \$\mathrm{RLC}\$ kit. I measured the internal resistance of an \$8.2\text{mH}\$ inductor with a multimeter at \$173\text{Hz}\$. When I measured it with a multimeter, it was \$5.7\$ ohms,...
- 11
0
votes
1
answer
79
views
Purpose and selection of inductor for RF power amplifier that has a VCC pin (MAX2616)
I am currently building an RF amplifier PCB for around ~2.4 GHz using the MAX2616, which is a broadband RF amplifier for 40 MHz to 4000 MHz.
Looking at the datasheet, I am confused about the purpose ...
- 11
2
votes
2
answers
161
views
Best Buck converter topology for high power charger?
I am designing a buck converter for a lead acid battery with an output current of 135 A and voltage from 108 V to 142 V in different CC and CV stages.
The input voltage is 165 V from a Vienna ...
- 123
4
votes
1
answer
298
views
Identifying inductor
I recently acquired an old VCR which does not power on. While attempting to fix it, I decided to try shorting a fuse (I thought it was broken). Long story short, the VCR’s power supply circuit started ...
- 375
1
vote
1
answer
129
views
Can line reactors be used for PFC chokes in high current Vienna rectifier?
I am working on a system where a Vienna rectifier will be used as the active front-end rectifier with power factor correction (PFC).
The input current into the system, and through the inductors, are ...
- 123
3
votes
2
answers
615
views
Inductor---how long can the rated current be exceeded for?
I'm planning on building a HV supply for a CRT TV capable of generating ~7.5 kV at the output. Here is a diagram of the supply:
More details (and the original diagram) can be found here.. I have made ...
- 375
0
votes
2
answers
83
views
What is ripple current in an inductor?
What is a ripple current in an inductor?
What is meant by ripple current and inductor ripple current?
- 85
4
votes
5
answers
1k
views
How is it that the inductor current doesn't immediately become zero even when there is no path for the current to flow?
This is a pretty basic question, but I thought I should get my basics clear. Suppose an ideal inductor is connected to a voltage source, through a switch. I wish to open the switch abruptly. We all ...
- 907
1
vote
1
answer
124
views
Flyback diode solution for inductive loads with GND loss and reverse polarity issues
I'm looking for advice on how to properly design a flyback protection circuit on the PCB for an automotive application, where the supply comes from a vehicle battery and the system must handle GND ...
2
votes
7
answers
575
views
Can energy be stored in an inductor even if the voltage across the inductor is zero?
From Hayt engineering circuital analysis 8th edition
Aren't the first two points contradicting?
- 41
-2
votes
1
answer
106
views
Why rotor coil (winding) of a generator doesn't short circuit
Why rotor coil (winding) of a generator doesn't short circuit after long time..
We know an inductor become short circuit when dc current supply in it for a long time.
- 85
3
votes
3
answers
695
views
How does the firing of a spark gap in a Tesla coil convert the open primary circuit to an LC oscillator?
According to my understanding, in this type of design, when the spark gap fires, the circuit closes and the primary circuit should act as an LC oscillator.
However, the ends of the primary capacitor ...
3
votes
4
answers
1k
views
Why isn't inductor current remaining same in the following circuit at time t=0?
I am trying to understand inductor behaviour, specifically boosting action provided by them by means of the following circuit.
Initially switch SW2 is closed and SW1 is open.
I expect inductor ...
3
votes
4
answers
256
views
Relay Voltage Transient: Releasing Coil to NC vs. GND and With vs. Without Snubber Diode
Experiment
Consider the following schematic, which tests a relay (K2) being switched by another relay (K1) controlled by a ...
- 155
0
votes
0
answers
46
views
BQ25620 VSYS layout
I'm designing a board with BQ25620 and I'm trying to layout the output VSYS loop.
On the BQ25620EVM User's Guide (Page 11) I ...
- 2,134
0
votes
2
answers
202
views
Which branches get current flow once an inductor is short circuited?
I'm currently studying RL circuits using Electric Circuits by Nilsson and Riedel. In the first section, where they discuss the natural response of a circuit after its inductor starts releasing its ...
- 111
2
votes
4
answers
394
views
Why does the current start initially in LR circuit?
We know that at t=0 in LR circuit the current is zero as the inductor completely opposes it but what makes the first tiny current to flow if the inductor keeps on opposing it what is happening on the ...
- 31
2
votes
3
answers
154
views
Example 7.4 from Fundamentals of Electrical Engineering (Charles K. Alexander, Matthew N. O. Sadiku)
The book already provides the answer. I'm just having trouble understanding one of its steps. Why is the current i(t)=6A that flows through the short circuit in fig 7.17a, the same as the one that ...
- 29
6
votes
5
answers
1k
views
Inductive kickback requires a capacitor to "kick back"?
I recently watched a video where a person demonstrated the spark caused by inductive kickback. He also ran a simulation of it in Falstad.
What confuses me is the capacitor and resistor, which he says ...
- 145
0
votes
0
answers
90
views
Hum noise from electro magnetic amplifier (inductor)
I have build this circuit which is taken from here: link
I'm having an hum sound regardless if the device is pointing a electrical device or not. What can cause this issue?
Here is a sample of the hum ...
- 103
5
votes
2
answers
758
views
What is the use of "infinite" inductances in case of ideal transformers?
The main characteristic of ideal transformer, that is, the primary and secondary voltages are proportional to the turns ratio and the primary and secondary currents are inversely proportional to turns ...
- 463
2
votes
3
answers
403
views
Short circuit behavior for a capacitor and voltage source in series
From Alexander Sadiku's Fundamentals of Electric Circuits, Example 8.2:
My current intuition of circuits tells me that any short circuit across the terminals of a circuit element, in essence, removes ...
- 334
3
votes
5
answers
710
views
Intuition for voltage on a capacitor in series LC circuit
I had a doubt in the following series LC circuit.
I came across this image in an answer for another Stack Exchange question.
Assuming an ideal diode, the voltage at the node on the capacitor would ...
- 31
0
votes
2
answers
136
views
How to test rated operating voltage of an inductor?
I am purchasing inductors for ±200 V applications to build filters. However, most inductors do not show rated voltage. Thus, I was wondering, is there a method to test the rated operating voltage of ...
5
votes
4
answers
841
views
Input Capacitors Getting Hot in Boost Converter
Here is boost converter circuit I am using and I have a 180 kHz control signal and output voltage feedback to IC. What I am facing is C33 (C1 and C2 in actual schematics below) gets hot, even when ...
- 137
4
votes
6
answers
366
views
Do two inductors in series make current lag 180 degrees?
I understand that inductors make current lag voltage by 90 degrees. What if I connect two inductors in series? Would that make current lag by 180 degrees?
This question arose when I was studying the ...
- 77
14
votes
7
answers
2k
views
Can Inductors be thought of as storing voltage?
When I was comparing the capacitor and the inductor, I thought that just like a capacitor stores charge, an inductor ‘stores’ potential/voltage. I tried browsing the net to find out why I was wrong I ...
- 163
0
votes
1
answer
112
views
Use of Inductor on Oscillator line
I am working with the WIFI module AP6256 and found this as a reference schematic. I am unsure what L5 and L9 inductors are used for. Can I ignore them?
Link to Datasheet: https://lcsc.com/datasheet/...
- 67
1
vote
1
answer
114
views
Buck inductor design
I am designing a buck circuit from 24 V -> 60 V to 19 V (30 A). I am calculating the inductor with f = 250 kHz. I am watching a tutorial video https://www.youtube.com/watch?v=i1uzuYbb81o
Which ...
- 49
4
votes
3
answers
372
views
Phase shift of high-pass L-R circuit extremely off at low frequencies
I am testing a high-pass (HP) \$L-R\$ series circuit. My inductor is 33 mH, and the resistor is 1200 ohms. The phase shift of my \$L-R\$ HP circuit should be \$\tan^{-1}(6200/f)\$ -- this works until ...
- 41
3
votes
4
answers
615
views
Is the physical formula for an inductor always true?
I am currently doing an experiment with an RL circuit and using an oscilloscope to measure the transient voltage response across a resistor. Using a time constant and the resistance of the resistor (...
- 511
0
votes
1
answer
159
views
How do you calculate the permeability inside a nonuniform solenoid?
So, I am doing an experiment that has me calculating the inductance of a solenoid. Long story short, I am trying to find the inductance using the device's physical dimensions (i.e., number of turns, ...
- 511
4
votes
3
answers
617
views
Is an ideal transformer with unloaded secondary equivalent to an ideal inductor?
I've read(†) that in AC circuits an ideal transformer with unloaded secondary draws no current in the primary. This is strange, because that's not the case with an ideal inductor (it draws current, ...
- 1,146
2
votes
1
answer
94
views
How to determine maximum RF power rating of an air core impedance matching inductor at HF frequencies?
Experimenting with single-band, fixed-frequency, end-fed, half-wavelength vertical antennas in the HF frequency spectrum. These near-ground level feedpoint vertical antennas require an impedance ...
- 39
-1
votes
1
answer
79
views
744873470 coupled inductor placement
I want to use the 744873470 inductor, but I am confused about how to place it.
This is the datasheet of it.
https://www.we-online.com/components/products/datasheet/744873470.pdf
This is the footprint ...
- 77
0
votes
1
answer
89
views
Ferrite core calculation formula for buck circuit
I am calculating inductors for buck circuits, I found this article that is what I want, but is the formula for calculating Emin and Ecore appropriate, I asked ChatGPT and it said Ecore is wrong, I use ...
- 49
0
votes
1
answer
140
views
Identify this burnt component (choke? transformer?)
This came from a ballast used to power a UV lamp used for domestic water treatment.
Two components burnt out, one was a capacitor which I identified no problem, and it was situated close to this ...
- 91
2
votes
0
answers
67
views
Critical parameters for selection a replacement coil in stepdown converter
The coil selected for a step-down converter, a TDK SLF10145, has been marked as end-of-life by the manufacturer, so I'm looking to replace it for a revised PCB. Ideally with a a physically smaller ...
- 18.6k
5
votes
3
answers
480
views
Basic Inductor Simulation on LTspice
I am simulating a basic inductor circuit 120V AC of 60Hz Voltage source with 2.65H inductor it has default of 1mOhms of series resistance.
reactance should be (2 pie F L) = 999 Ohms or 1K
the current ...
- 53
6
votes
1
answer
402
views
Characteristics of Inductor with magnetized core
I salvaged an inductor from an old PCB and measured its inductance, which appears to be 50 µH. Interestingly, the ferrite core exhibits remanant magnetization.
My question is: What is the purpose of ...
- 125
2
votes
3
answers
266
views
Analysis of Capacitor Voltage in a Circuit with Ideal Diode and Switch
In the circuit given here, \$D_1\$ is an ideal diode and key \$K_1\$ is ON for a long period of time. Now at time \$t_0\$, key K₁ is opened. Draw the voltage waveform oncapacitor C and find the final ...
user541308
7
votes
6
answers
1k
views
Transformer dot convention
If both input and output voltages are in phase, both dots will be shown up.
If the voltages are out of phase, the second dot will be shown down.
But how can the voltages be exactly in phase or exactly ...
- 1,444
-2
votes
1
answer
95
views
How much inductance and turns would I need for a LC circuit for mw band?
I been trying to make a LC circuit for mw band or sw band for now I only have a 3-18 pF trimmer capacitor and this small ferrite rod.
What gauge of wire and how many turns would I need for LC circuit ...
- 23
1
vote
3
answers
181
views
Design of current boost converter part 2
This is a follow up of my previous question Current boost converter and as stated in the answers the issue with the current boost converter technology is the inductor who is in series with the ...
- 498
1
vote
2
answers
122
views
Turns of toroidal inductor
I need to customize my inductor for 50 mH. But I am confused about the number of turns. I chose T16 ferrite core. According to the calculation, I need 174 turns, though my calculation can be wrong. ...
- 21
3
votes
3
answers
186
views
How to find current in this RL circuit?
I could easily solve for Ix and I in the inductor. Still, when the switch is opened and discharging occurs, I don't understand how I can model a differential equation to get the current in the ...
- 75
2
votes
2
answers
301
views
What winding geometry maximizes inductance, but minimizes stray field and resistance for air-core inductors?
I want to make an air-core inductor with about 1 mH of inductance. All dicussion below is based on online calculators, such as these ones for wire loops and toroids.
At first, I considered how to ...
- 25.6k
7
votes
3
answers
3k
views
If capacitors are frequency-dependent resistors, then what are inductors?
I was reading The Art of Electronics 3rd Edition, there it was saying "You can think of capacitors as frequency-dependent resistors."
So in terms of this description, what could inductors be?...
- 327
1
vote
1
answer
109
views
Mystery Ferrite (or Iron Core) Toroid - Need help finding the part number based on measurement and color
I have been busy building a superheterodyne reciever and while working on a bandpass filter I found these toroid cores in my miscellanious bin (I likely recieved it in a box of unwanted parts from my ...
- 402