Questions tagged [inductor]

An inductor is a 2 terminal passive device that stores energy in a magnetic field.

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Interview Question

This Circuit was given. I know every component of this circuit individually, I know feedback and gain margin and transconductance amplifier. But the problem is how to start? first, I was thinking to ...
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What are those components for? [closed]

So I have three different circuits and I need to purpose of some components in them Series resonant converter circuit. What is the purpose of Lr and Cr components ? Variable speed/light control of ...
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Purpose of components [closed]

These schemes are not related to each other. Can someone tell me the purpose of the Lr Cr components here? What is the purpose of the 39 ohm resistor and 0.01uF capacitor? What is this circuit used ...
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Current Direction and Voltage Polarity in Capacitor/Inductor Circuits

I believe that this question may be simple for those with a little more experience, but it is still puzzling me. Studying capacitance/inductance, I understand that the capacitor in the DC case behaves ...
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I want to Implement this active inductor design in my circuit

I'm trying to use the active inductor in here instead of the inductor in my class e power amplifier, however I'm having difficulties in getting the required values for the parameters in here Cds, Cgs, ...
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The switch pin of boost converter seems to pull down the input voltage

I'm designing a circuit to convert the 3.7-4V Li-ion battery output to a steady 5V DC power supply. The boost-converter I chose is a synchronous boost converter SGM6611C with a fixed switching ...
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How to reduce or eliminate inductor sound noise in a buck SMPS?

I use this circuit as my device power supply: Here I have R2=5.6K as my SMPS load but at this load I have about 10KHz switching frequency which leads to an annoying audible noise, probably from L1 (...
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Inductor calcualtions to limit inrush and avoid oscillations in power line

I want to design a circuit that is able to supply my load with 12V at 2.3A for around 10ms when the power is switched off. The capacitor size will therefore be 23000 uF, assuming a 1V sag. Applying ...
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2 votes
2 answers
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DC-DC booster functionality

I am working on a DC-DC booster. I have already built it, boosting 1.7 V to almost 18 V. I am using an IRF540N as my transistor, an inductor, a diode, and two capacitors. I was reading about how the ...
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4 votes
2 answers
114 views

Skin effect reduce inductance

I have a question about the skin effect on inductors, I would like to know why the skin effect will reduce the inductance? You could see from the below figure, in the high frequency the inductance was ...
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Isolate digital switching from audio circuit

I'm using an L298 H-Bridge to drive a DC motor. The motor is spinning a magnet across a guitar pickup at ~30 Hz. That signal is then amplified and sent to a speaker. However, the output signal also ...
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How can the induced voltage be proportional to the frequency?

According to Faraday's Law, in coupled inductors, the magnitude of the induced voltage at the secondary coil is proportional to primary power source's frequency (V2 = w x I1 x M). On the other hand, ...
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Is there any advantage if the PFC inductor is split in between +ve and -ve input line?

While doing the reverse engineering this is what I observed. The PFC inductor is having 8 set of pins , out of which 4 are shorted to input (+) and 4 are shorted to GND (input return). Obviously , ...
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Why does the quality factor include 2*pi?

The quality factor is defined as the ratio of stored energy and dissipated energy (see below). The formula includes \$2\pi\$ as a constant coefficient. Why do we need \$2\pi\$ to calculate the stored ...
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2 votes
3 answers
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What is the core material being used in CMC (Common mode choke) and DMC (Differential mode choke)?

The core symbol in below diagram indicates that it is an iron core material but Iam not sure whether it is correct. I see the same representation in many other circuit schematics as well. Below ref ...
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Why are differential mode chokes (inductors) not generally coupled?

I understand there are both coupled and un-coupled versions of differential mode chokes as shown below. Which one is better? I see most of the designs having un-coupled version. What is the reason? ...
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Question on RC circuit.(Texas Instruments interview)

I have confusion in this circuit. I know at t=0 both capacitor charges instantly. and voltage divided between both capacitors equally. but after some time output loop start active and capacitor C1 ...
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Inductor with center tap - OrCAD [closed]

I am trying to build a circuit in OrCAD, and I have an inductor with tree terminals. which component should I use for it? L=0.02mH
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2 votes
1 answer
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LTSpice RL circuit simulation with ideal inductor and inductor from database

I am trying to simulate a simple RL circuit as shown below, the top one using inductor from the component library and the bottom one is picked from the database. Below is the properties of L1 ...
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5 votes
6 answers
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Why can't current change instantaneously in a given inductor?

I know the mathematical reason behind this. Given the inductor I-V characteristic we know that: I understand mathematically that a function which is differentiable must be continuous, but what is the ...
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4 votes
2 answers
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How can I model this power inductor more accurately? [closed]

I'm running some spice simulations in which I use power inductors. I found one on Aliexpress that seems suitable, but noticed that peak currents in the simulation exceed the rated saturation current ...
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Instability of RL circuit

I have the following circuit The transfer function is $$H_K(s)=\frac{R}{Ls+R}$$ I have three questions. Given \$s=\sigma+j\omega\$, \$\omega=2\pi f\$ but what is the physical meaning of \$\sigma\$? ...
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1 answer
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Designing GPS matching network with TESEO and chip antenna

I am new to designing for RF and have a question regarding the design of the matching network for a GPS module I am working on. The datasheet of the chip antenna ANT161575ST-1202A1 recommends a ...
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1 vote
1 answer
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Coupled inductors for multi-output buck

I see coupled inductors are generally used in multi-phase design to take advantage of current ripple cancellation. What is really the advantage of coupled inductor in multi-output buck or multi-output ...
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Inductors on square forms

Would an inductor wound on a form with a square cross section have similar characteristics to one wrapped on a circular one of similar size?
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Discharging a capacitor into another capacitor via inductor

What would happen if you connect a charged capacitor (charged to V voltage) with another capacitor of same rating via inductor. What would happen ? Will both capacitors will have same voltage and if ...
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3 answers
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Charging inductor flashes an LED

I'm experimenting with how inductors store and release energy into a circuit. I made the following circuit (I'm not sure of the actual inductance value because I'm using a "Snap Circuits" ...
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-1 votes
2 answers
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SMD inductor fell off of a board, not sure what value to use [closed]

An SMD inductor fell of the board. It is marked L12. I have another working board and the are no markings on it, it's tiny and black. I touched the two points with a screwdriver for a second and the ...
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1 answer
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How can I solve the following phasor analysis question?

How can I solve part B? Obviously, since the two sources have different frequencies I started off by killing the voltage source (short-circuit) and then tried to apply KCL. My goal was to find the ...
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Planar PCB inductor coil simulation

I am working on a planar PCB coil with a complicated shape (not the traditional circular/rectangular spirals.) It is essentially an inductor made out of PCB traces. I want to figure out the inductance ...
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1 vote
1 answer
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Dependent voltage source in RL circuit

In this question, V1 is a dependent voltage source. The question asks us to calculate i(t) and ix(t). Assume that \$ i(0)= 10 A \$ for the inductor. I decided to make mesh analysis. Mesh 1: $$0.5\...
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Why does this method of measuring inductance work? [closed]

I recently watched this video from EEVblog showing a method of measuring inductance. I'm probably missing something obvious, but why does this work? Mathematical proof would be great. Thanks. https://...
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6 answers
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Is there a voltage across an ideal inductor?

I have been learning about LC and LCR circuits. My question is about inductors themselves, more specifically ideal inductors with zero resistance. If I disconnect an ideal inductor from a DC supply, ...
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Current in inductors of emi filter

I am currently working on an EMI filter for a led driver (constant current). Here you can find the according schematic: My question now is, which (if any) current is going through the inductors/have ...
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EMI Filter - current in inductors / part selection

I want to use a NLDD-1400H LED Driver as constant current source with 1.4A ouput. On the last page of the datasheet there are information about an EMI Filter, I want to use. Here is the schematic: ...
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2 votes
1 answer
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In calculating the inductor for a boost converter, where does the power of the voltage source calculate in?

simulate this circuit – Schematic created using CircuitLab As I am using LTspice to develop different types of dc-dc boost converter topologies and wanted to define the best inductor to use when ...
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Buck-boost Von and Voff calculations

Regarding the A to Z switching power supply book,I calculated the Voff equation which is against the book's calculation. My KVL for Von mode: $$-Vin+Vsw+Von=0 => Von=Vin-Vsw$$ which confirms the ...
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2 votes
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Triboelectric Nanogenerators Full bridge rectifier design

I am working on energy harvesting from Triboelectric Nanogenerators abr. TENG (mechanical to electrical high impedance converters) and wanted to validate my understanding of the following circuit and ...
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Building DC to DC converter using a inductor

Can I build a DC to DC converter like this? simulate this circuit – Schematic created using CircuitLab When the switch is moved due to the low resistance path it will take a lot of time for the ...
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Can inductors interfere with a BLDC motor?

I'm working on a student project. It involves running a brushless DC motor with 70uH external unshielded inductors on each phase. Can the inductors, seeing as they generate a magnetic field, somehow ...
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1 answer
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Inductor polarity

By looking on the picture of the inductor PE-0402CL470JTT and the datasheet, we can notice a black pole and a white pole for the inductor. Is there any difference between poles? The datasheet doesn't ...
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6 votes
2 answers
289 views

Trouble reading a variable inductor (tunable RF coil) datasheet

I have a trouble reading this datasheet for the Coilcraft 7mm Tunable RF Coils – 146, 150 Series. I see there are two main types of such inductor: with shield can and without it. I'm going to buy one ...
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2 answers
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Buying a variable inductor

I need a variable inductor of about 70 nH. I found one at Mouser. As you can see, it says that its inductance is 70 nH, but when I open the datasheet it says that inductance is from 9 to over 280 nH. ...
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1 answer
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How can I make a 50mH inductor/coil that can stand up to 3A current to be used as a DC inductive load?

It will be used to simulate an inductive load for a DC output.
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1 vote
2 answers
54 views

Laplace Transformation: Determine the current through the inductor versus time i(t)

simulate this circuit – Schematic created using CircuitLab I am trying to find the current through the inductor versus time i(t) using Laplace transform. Converting everything into the s-domain: ...
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How can one value describe the impedance of a group of reactive components at all frequencies?

The author of the textbook containing this circuit states that the filter input and output impedance is given by: Z = (L/C)^1/2 He then shows that by setting the source and load impedance to this ...
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1 vote
1 answer
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How to model a choke on LTSpice?

I am simulating a power supply on LTSpice which has two filter chokes (as shown below). The nameplate on these chokes has the following information. First choke - DC Filter Reactor, 4 terminal, 40µH, ...
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1 answer
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Multiple resonances in a circuit

So I have been struggling a little to understand why when we measure the impedance of the inductance over a large frequency range multiple resonances occur. To do so, I model a 2 turns inductor in ...
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62 views

Inductor selection for differential filtering

I'm designing a line filter (230Vrms) and I am not sure how to choose the differential filtering inductors. I have calculated/simulated that I need 33µH inductors, but I am unsure how to actually ...
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Paralleling common mode chokes

Regular chokes can certainly be used in parallel so that multiple smaller chokes with a lower current rating can be used. But does this also work for common mode chokes? I would assume that ...
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