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Questions tagged [inductor]

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

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Series RL current equation

I am trying to derive a inductor current equation for \$i(t)\$ in a series RL circuit when the switch is closed at \$t=0\$, as seen below: I have posted my attempt so far but I'm having trouble ...
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2answers
56 views

Must the air gap in a transformer always be perpendicular to the magnetic field lines?

The air gap in a transformer seems to always be spaced across the cross section of the core, where the magnetic field in the core has to then flow across it. Since the core is typically made of ...
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48 views

Software for the Simulation of Inductors [on hold]

I was wondering the reason of the difference between the inductors, transformers or any component that has a coil in it. I was wondering if there is a software that allows you to simulate the ...
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1answer
63 views

Why does duty cycle seem relevant when calculating inductor current in boost converter circuit?

I've been working hard to understand boost converters and the role of inductors in the boost converter circuit. I found a pretty good list of basic calculations from Texas Instruments and I started ...
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1answer
67 views

How do inductor specifications impact their effectiveness in a boost converter circuit?

I've been trying to understand how to select an adequate inductor for a boost converter circuit. I'm a hobbyist so I'm not always sure what to look for, so I haven't been able to find something that ...
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2answers
81 views

Finding the average power dissipated in a resistor

Well, I've a series RL circuit that is powered by a voltage source. The input voltage is given by: $$\text{V}_{\text{in}}\left(t\right)=50+\frac{400}{\pi}\cdot\sum_{\text{n}=1}^\infty\frac{\sin\left(...
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Approximately how much time for a switch to go from on to off cleanly? [duplicate]

I have a simple circuit in which there is an inductor, a power source, and a switch. The equation for the voltage induced by an inductor is v = Li di/dt, where di is difference in current, dt is ...
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47 views

How can an inductor/coil turn a bjt on and off?

I've seen a boost converter circuit on YouTube, and the guy uses a second coil, wound on top of the first coil, and in the same direction, it is connected to the base of a BJT. The BJT acts as a ...
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1answer
3k views

How much time does it take for a switch to go from on to off?

The equation for the voltage across an inductor is v = L di/dt. When a switch changes the circuit from closed to open, it changes the current very quickly. My question is how would one know exactly ...
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2answers
256 views

Buck converter, squeaking/whining inductor

I have a problem with my homemade buck converter. It is based on a TL494 control chip with my discrete MOSFET driver. The problem is that my inductor squeaks and whines, when the output current ...
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44 views

Series RL Circuit Transient Analysis

I have worked through a question and I am unsure if my answer is correct. It is a series RL circuit with a switch that closes at t=0, supplied by a dc source, which I am trying to derive an expression ...
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24 views

Calculating Currents and Voltages in and AC RL Circuit provided below

I am studying RL Circuits with AC sources. I am trying to solve this circuit So far, I am only able to calculate the current iL through the inductor as for the other parts I can't grasp the concepts. ...
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43 views

Can I use this inductor in my boost converter circuit?

I used TI Webench to spec out this boost converter circuit: The design calls for an inductor that is marked as end of life. Can I use this inductor instead? My hypothesis is that they are ...
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53 views

How do I decide which which oscillation frequency and capacitors to use with a boost converter?

I'm working on a few projects where I'll be driving about 8 WS2812B LEDs on a 5V rail with an ATTiny85 (I think the whole circuit is going to draw about .5A; I'm using .75A for my calculations). I'm ...
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2answers
119 views

Why have an inductor between 2 parallel capacitors? (LED driver)

This is the driver for a LED Bulb. I don't understand why there is an inductor between the 2 capacitors C1 and C2? I understand that C1 and C2 are used to handle low frequency ripple and the noise. ...
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1answer
92 views

Simulated inductor for guitar use

Edit: Sorry! Please bear with me, this is my first post! Well, it seems that placing a buffer before certain fuzzes can chance their sound. However, placing an inductor after the buffer cancels this ...
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55 views

Buck converter - problem with connection or disconnection of battery

I am working on a buck converter from a solar panel to a battery, in order to do MPPT. It is a synchronous buck converter, with a 12 V battery for output. I am currently trying to make a prototype of ...
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1answer
32 views

Finding the time constant of an RL circuit

I've the following circuit: simulate this circuit – Schematic created using CircuitLab And I've to find the time-constant of the voltage across the inductor. I did the following: The voltage ...
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1answer
36 views

How to choose RF choke in the biasing circuit of varactor-tuned resonant circuit

I am new to circuit and has a very basic question about how to set biasing circuit of varactor. I need to use varactor to tune the resonance behavior of Split ring resonator (SRR) structure when ...
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1answer
32 views

dual rail DC/DC convertor and CMC

I have a DC/DC convertor that tales 5V and makes + 15V and -15V rails My question is how to place common mode chokes to reduce common mode noise. Should I place 3 of them (1 on the negative to Gnd , ...
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4answers
468 views

What does a bar symbol in parallel with a single inductor indicate?

Some circuits have parallel bars on their inductor symbols such as: Does that mean the inductor is wound around a magnetic core instead of air? Is that how a differential choke is represented?
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1answer
57 views

Questions on Inductor Selection guide from TI [closed]

I have been researching on Selecting inductors for Buck Application and came across an Application report from TI. I have few questions which are listed below: On ...
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4answers
92 views

Can’t reproduce oscillations using a simple inductor capacitor circuit?

I’m trying to reproduce a simple oscillator conductor / inductor circuit as shown here. I replicated exactly the same scheme on a breadboard and check all the connections using a led However when ...
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What are the drawbacks of using a ferrite inductor in a boost converter circuit

I have dissected a boost converter so I can remake it on my own PCB. It works fine but I am now experimenting with using different inductors to reduce the overall footprint. I tried installing a ...
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3answers
953 views

Methods to measure inductance with high (1%) precision using standard equipment?

I am modeling the fine behavior of interacting oscillatory circuits. I have looked up a couple of methods for measuring inductance. I believe I am following the procedure faithfully, but the values I ...
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2answers
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Ferrite vs. iron powder toroid for buck converters?

I'm wondering about the difference between small (13 mm outer diameter) ferrite and the yellow white iron powder toroids. Will the ferrite toroids saturate at 5 A current? I'm planning on using ...
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1answer
65 views

What would be the consequence of the inductor saturating?

The following is a section from a book where it is talking about decoupling by LRC at supply terminals. I highlighted the sentence where I didnt understand: I read that if an inductor has an iron ...
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2answers
48 views

Impedance of individual component in complex AC circuit

In a AC circuit with just a capacitor or inductor, reactance is the impedance of the component, and in a non-complex RLC circuit you can just find the total impedance with vector addition (Ztot = sqrt(...
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42 views

What are the important specs for inductor in passive tone control?

I'm pretty much an electronics newbie. I'm working through some circuits in "Electronic Projects for Musicians". It has a "Passive Tone Control" which seemed like an easy start. Unsure if I can ...
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4answers
96 views

What is a “phase reversal” choke and why is it used?

I was recently looking at the circuit for an HF radio amplifier called the "Packer" amplifier. It's a typical HF amplifier that puts out about 35 watts. The final output stage uses IRF510 MOSFETS ...
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0answers
52 views

Calculate inductance of chokes for a induction heater

simulate this circuit – Schematic created using CircuitLab I´m trying to build an induction heater, I have builded four of them and only two worked, one of these blew up both IRFZ44N (first it ...
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2answers
68 views

Choosing inductor and capacitor for boost converter

I am working on a IoT project that involves an arduino and a 4G LTE module. The device will be operated with two Alkaline batteries. Both the arduino and LTE module require 3.3V input so I want to ...
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0answers
31 views

Input and Output Impedance of a SAW Filter

I am reading the datasheet of a SAW Filter B39162B4348P810. The datasheet doesn't say much about impedance of Input and Output ...
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1answer
47 views

Can the location of the inductor on the board affect the operation of the microcontroller?

I have a voltage regulator, based on LM2596, in its circuit there is an inductor on 33uH. The question is, can this inductor be a source of interference? Next to him, I plan to place the Atmega328P ...
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3answers
141 views

Confusion of how current can flow in a 1+ henry LR circuit

I'm trying to understand how current actually flows in a circuit where you have a 1 Henry or greater inductor in it. I understand that the voltage across the inductor is ...
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0answers
52 views

Hybrid Boost-Flyback Stability Issue

I tried to design a step up SMPS to create ~200-300v from a 24V input with an expected power of ~12W max. Since the project is for a hobby, I chose to attempt a hybrid boost-flyback converter to get ...
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1answer
28 views

Does waveform shape affect transformer eddy current loss as frequency changes but peak voltage is fixed?

I'm trying to figure out how eddy currents change with frequency. While learning about this its occurred to me that eddy currents might be impacted differently as frequency changes, if the voltage is ...
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0answers
31 views

Choosing an inductor for a bias T

I'm creating a Bias-T circuit for a certain application. When choosing my inductor to block my AC-signals I know for example the proper inductance to choose etc. However, what I am having trouble with ...
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33 views

RLC series circuit with initial current

I'm trying to solve, for the voltage across the capacitor in the following circuit: simulate this circuit – Schematic created using CircuitLab The initial current in this circuit is equal to \$...
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4answers
66 views

Improvised inductor core ideas

I was wondering if anybody could suggest some common items around the house or at the hardware store that would make a passable core for an inductor. Or items that I could salvage material from. For ...
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1answer
68 views

DIY Solar lamp circuits with 5252F explained?

I have a bunch of solar panels, rechargeable batteries, 5252F circuits, inductors and LEDs and while reading https://artists.scitoys.com/three_volts that seems to be enough to make my own solar-...
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1answer
54 views

1st order circuit analysis

I'm having trouble with this exercise which I don't have a solution for, I'm used to dealing with simpler 1st order RL or RC circuits. Mostly I'm a little confused with the sinusoidal generator and ...
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0answers
63 views

Finding Current in Parallel RLC Circuit with 2 voltage sources?

I've spent sometime learning about step responses for series/parallel RLC circuits, but this problem takes things a step further, since C seems to be in parallel with a series combination of RL and a ...
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1answer
77 views

Practicality of using flat-spiral coil as electromagnet?

For my project, I'm using a 3D magnetic sensor to track the proximity of a local electromagnet at any time, no more than a finger length away. Ideally, I would like the the electromagnet to be: ...
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4answers
96 views

Inductor with constant current source

Hii can anyone explain how to do this. Its Given Answer as 6A. What exactly happens when a constant current source in series with inductor? TIA
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2answers
45 views

In a three phase choke, is the rated current per phase or for all 3 together?

In a 3-phase choke, for example here: https://katalog.we-online.de/pbs/datasheet/744839010400.pdf What is the current rating? For the inductance it says 3x10.5mH, so its 10.5mH in each phase and if I ...
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0answers
120 views

RL Circuit Analysis with 2 sources, how to find current of resistor?

I've been tackling some problems related to natural and step responses for RL & RC circuits, but I think I've hit a major roadblock for this RL circuit. I'm trying to find the time constant and ...
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2answers
34 views

buck converter inductor lm2576

I was curious and looking at the datasheet of the buck converter IC LM2576, looking at the inductor selection guide it feels counter intuitive to me. Why is the inductor value needed reducing as we ...
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1answer
56 views

How does flux change polarity in full bridge SMPS transformer?

Take a full bridge switching circuit connected to the primary of a transformer. Assume: No load on secondary. Voltage into full bridge is DC. Duty cycle of switching is 50%. At t = 0, full bridge ...
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4answers
76 views

Minimum specs before a flyback diode is needed for a relay?

Given a low power signal relay, 3V 140mW coil, controlled by a 2n3904 npn transistor, is a flyback diode required? At what point is a flyback diode needed for any given inductor? Is it total power, ...