# Questions tagged [inductor]

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

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### Does the effective reluctance of an air gap between two windings increase from circulating air?

If I have an inductor next to another copper coil (I don't exactly know the lingo for a coil receiving power from an inductor), and there is a significant but not large air gap between the two coils, ...
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### How to find nature of RLC circuit?

If a resistance value, XL value and XC value are given, how do we determine the nature of the circuit (whether it's capacitive, resistive or inductive)? The only thing that comes to my mind looking at ...
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### How do I calculate the number of turns or inductance while designing a transformer?

I was trying to design a transformer for a SMPS but can’t find any resource to calculate the number of turns and the core area. I know that the turns ratio has dependency with the signal frequency. If ...
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### Selecting larger inductors than necessary for cost optimization

I'm designing a board that I want to initially manufacture using JLCPCB for both the board fabrication and assembly. The pricing approach at JLCPCB separates available components into commonly used &...
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### How to reduce inductor heating in buck converter?

I am designing a simple buck converter to drive 9 V, 3 A LED. Supply can vary between 20 and 30 V. I used the TI Power Designer Tool to calculate the inductance value and other parameters. Here is the ...
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### Signal is garbled when driving inductive load

Background I'm trying to make a circuit to determine rotor angle of a motor using a resolver https://en.wikipedia.org/wiki/Resolver_(electrical). This involves generating a ~5-10kHz sine wave to drive ...
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### Can I use common mode power line choke as 1:1 transformer in isolated buck-boost switched mode power supply at 20 - 100 kHz?

I'm planning to build a multi-output power supply that allows output voltages between 0 - 30 V and currents below 5 A. The idea is that I will purchase a number of 30V 5.3A power bricks (unknown if ...
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### Buck Converter Theory Confusion

For a buck converter, I'm having a hard time conceptually understanding what is happening. Here's my thought process: When the switch is closed, their is a positive voltage across the inductor equal ...
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### Is nodal analysis applicable to a circuit containing a DC and AC supply?

I think I can solve it using superposition but I am wondering if the nodal analysis is applicable to a circuit containing both an AC and DC supply? I am having trouble with what frequency I should use ...
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### Reason of inductive kick

Suppose an Ideal voltage source is connected with an RL circuit all components in series for a long time. Suddenly switch is opened and the inductor will built across it the voltage which will make ...
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### Boost converter shorts out the power supply under load

I'm building a DC-DC step-up (boost) converter using TL494. The schematic is attached Input voltage: 9V The resistive divider at the output sets the output voltage to about 14V Desired output current:...
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### Choosing Inductor for dc-dc converter USB-C Application

I am a high school student working on building a USB-C charger using TPS25740B(93 W) (datasheet) as the PD controller and MC34167 (datasheet) as the dc-dc converter. I am a little confused as to how ...
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### Why is the coupling coefficient constant for different airgaps in a coupled inductor on an EE core?

I recently made a coupled inductor on an EE core and wanted to calculate the coupling coefficient at different airgaps. The windings were each on their own outer leg and the airgap was inserted in all ...
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### Measuring inductor current with oscilloscope in a parallel RLC circuit

How can I obtain the inductor current waveform on the oscilloscope? If L=1 henry then integral of voltage across the inductor can give me the current but if the oscilloscope can't take the integral ...
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### Constant Voltage Applied to Inductor

I'm seeking clarity on understanding what happens when a constant voltage is applied to an inductor. I gave this explanation in another thread and it was regarded as wholly misguided in the following ...
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### How does a driving voltage affect an LC circuit?

I need help understanding how the drive voltage $V_d$ and the coupling capacitor $C_d$ in the circuit above affect the total energy of the LC circuit. The author arrives at the following equation ...
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### Magnetizing Inductor vs Transformer

I am a bit confused by the diagram - are there two inductors in parallel on the primary side of the flyback transformer? How does no current flow through v1 when the switch is closed?
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### Inductor Back EMF Direction Relative to Changing Current

I have spent a lot of time thinking about Faraday's law and common explanation as given on wikipedia does not sit well with me. I may be confused. My concern is entirely with the wording of this ...
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### Need help choosing a toroid to wind an inductor for a high-pass filter

Trying to listen to HF but my RTL-SDR V3 is being overloaded by AM broadcasts so I'd like to build a high-pass filter to block the AM broadcast band. I thought I'd start simple and try making the one ...
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### A coil of inductance 0.50 H and resistance 100Ω is connected to a 240 V, 50 Hz ac supply. What exactly is 240V here?

As far as I've understood, doesn't 240V represent Vm here? We solved questions in class like these (but in those it was inductance only) and there we took Vm one as the one given with the frequency. ...
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### Formula for calculating instantaneous power in pure inductive and pure capacitive circuit

According to the material provided by a faculty this is what the formulas were and how they were derived. According to the derivation we did in class, we were getting: P = -VrmsIrmssin 2ωt for pure ...
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### How to solve this oscillator problem

I have done some calculations which I have shown below here i assumed that total current supplied by battery is I here is the problem
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### Is the current supplied by battery constant if I connect a battery to a capacitor and inductor in parallel?

If I connect an inductor and capacitor in parallel will the current supplied by battery be constant or will it die out? I have done some calculations which I have shown below here i assumed that total ...
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### Practicallity of winding inductor for high current DC to DC boost converter?

This is a very basic question, not about the various designs of DC DC switched mode power supplies, but the practicalities of the inductor involved. If you want to boost from 12 volts to a much higher ...
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### How exactly does the inductor in an LC filter reduce motor noise?

I'm currently working to quiet down the emissions from a stepper motor drive circuit. The motor drive frequency is 22kHz, and there is significant 60MHz noise that comes ONLY from the 36V side as ...
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### Slayer exciter doesn't work

I know that similar questions have been asked here, but none of the answers seem to work for me. Also, I am new to this site, and I am not much of an expert when it comes to electronics, so feel free ...
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### Determine $i_L(t)$of the RLC circuit

I have an RLC circuit that I am supposed to solve using s-domain analysis and I have gotten stuck when trying to transform back into time domain. I utilized node voltage analysis to determine the ...
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### Inductive kick back [closed]

I have simulated two circuits, the switches are open in the beginning and closed and opened after that, because of back EMF the FET has high voltage on VDS for a moment. But one config has 63V as max ...
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### Can CM choke windings be used for LC filter at the output of SMPS or DC-DC Converter?

I need to filter out switching noise at the output of SMPS/DC-DC converter with an LC filter. I have a bunch of CM chokes lying around. Can I use a common-mode choke: with both CM windings connected ...
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### Why is a 4th order circuit referred to as 2nd order?

An $n^{th}$ order circuit has $n$ reactive components. So a circuit with 2 capacitors and 2 inductors (total of 4 reactive components) should be considered a 4th order circuit. However, I have ...
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### 2nd Order Circuit

just want to check whether am i doing correctly? How do I know when should I find Voltage ODE and when should I find current ODE? Thank You Update: Vc(0) shld be zero.
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### LTC3813 Boost Converter design help

I'm working on a boost converter design for a lawn tractor conversion to electric. I use a 90v PMDC 2.5 HP motor (21 Amps nominal) from an old threadmill for load and 4 12v 100Ah AGM batteries in ...
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### MC34063 inductor current peak does not match calculations

I am trying to design a voltage inverter based on old/cheap/jelly bean parts. I wanted to use the MC34063. Mostly for learning purposes, so I don't look for easier parts to use for now. I run the ...
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### Which components cause low humm and medium to high pitched buzz in this computer monitor? [closed]

I recently bought a ten year old 10-bit color fidelity computer monitor (NEC PA301W) that has brilliant display quality but to my sensitive ears has an audible/annoying low pitched humm noise along ...
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### Help identify this inductor / choke / coil

This is from a Socket 370 motherboard (Epox EP-MVP3G-M) that has some burst caps. Sadly it also seems to have taken one of the inductors(?) with it. I'm having a heck of a time trying to order ...
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### E Series: is there any place that explains it?

So I am doing a work on optimizing circuits, and I came to study the E series of components. I'm a bit confused and I cannot understand soem things: How do the tables of values (E3: 1.0, 2.2, 4.7) ...
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### Voltage vs frequency in RLC circuit

https://www.eeeguide.com/voltage-and-current-in-series-resonant-circuit/ Here is the graph b/w V vs f. Why at some particular frequency (fc), the capacitor voltage goes beyond supply voltage (Vs) ...
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### IDC, Irms, Isat and Current Rating (inductor). Webench

See image. When choosing alternative inductor with webench it has the value "IDC" in the top in "recommended limits" and "current rating (Irms/Isat)" below. Even thou &...
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### Is higher inductance always better in voltage regulator? and 2 other questions [closed]

I am specifically looking at a boost converters. But I guess the same answers apply for buck converters etc(?): questions 1: Is it allways better to have a bigger inductor in a switched power supply? ...
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### Current specifications of the boost inductor

The following calculations refer to the boost inductor of a PFC boost pre-regulator. ILac is defined as the ac inductor current.as it says "ac inductor current" and its value is calculated ...
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### Question about voltage in parallel circuits

So here is my schematic diagram at t < infinity for an RL circuit. I am given only a voltage source. My question is that since the voltage is connected to both ends of the circuit in parallel with ...
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### What does "IDC" stand for in inductor for boost converter?

In Webench at TI.com it states "IDC" as a parameter for the indcutors. What does this stand for? Saturation current? max current? ripple current? something else?
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### Inductor Datasheet (Inductance No DC)

Can anyone please help me understand what is Inductance (Typical) and Inductance No DC in the datasheet of inductors from Pulse Electronics? The link for datasheet for toroid inductors of Pulse ...
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### Sanity check inductor calculation

Input: 3.3 V Output: 13 V Output current: 200 mA (actually less then 60 mA but with some headroom) Ambient temp: max 70°C Regulator: LMR62421XSDE/NOPB So my question: What is the smallest inductor I ...
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### How do I find the voltage source? [closed]

I need help with this question. The purpose of this question is to find Vs. The current given is Io which I use as I3. However,the result I get is different from the answer. Can anyone help me check ...
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### Why so much space around these toroid windings?

I have recently noticed some toroids wound with what I consider to be huge space left over, and I am asking if there is any good reason to do this. (or even an acceptable reason would do). My thoughts ...
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### How does a flyback work when there is no output load?

From what I understand, when the MOSFET is ON, the output diode (D1) is reverse biased. Then when the MOSFET turns off, the magnetic field of the transformer collapses and provides power through the ...
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### understanding inductor parameters when choosing inductors

I need a voltage regulator to drive an OLED display with 13V/ 50mAmp. I have 3.3 Volt to feed it with. I am thinking of using this boost regulator (because it is cheap): regulator This regulator(...
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### Way to handle rapidly changing current demands and excess heat

So I have a circuit like this: And I am driving it with a desktop power supply at 5A (<1 Volts varies by coil). The issue that I am having is that my power supply is overheating. I am rapidly ...
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