Questions tagged [inductor]

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

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Winding Loss of the Transformer and Choke

Do the number of windings turns (N) proportional to the value of the transformer's winding loss? Do the number of windings turns (N) reversely proportional to the value of choke's (inductor) winding ...
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What is the value of the opposing voltage created by the inductor?

Assume I've connected an inductor to a DC or AC source. The voltage across the inductor due to the source current would be L di/dt. But we know that the inductor induces/creates a voltage to oppose ...
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Buck Converter dies unpredictably upon connecting power

I made a PCB for an ESP32-based solenoid controller that is powered by a 24V DC Jack. I'm using an AP63205 Buck Converter to step that input down to 5V DC, and then a linear 3V3 LDO to power the ESP32....
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Advice needed for Antenna Amplifier PCB [on hold]

Hello i have an antenna amplifier pcb and it looks in bad shape but my skills on electronics dont go far so im wondering if someone can tell me how i would save ( if its possible) this pcb, like ...
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Why should care be taken while closing a capacitive circuit?

The other day in class, our professor told us that care should be taken while closing a capacitive circuit and while opening an inductive circuit. Why is this so? I partly understand the inductive ...
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Non-linear Inductor LTSpice

I am trying to implement a non-linear inductor in LTSpice and to get it to saturate. I am using the following directive between N1 and N2 as advised in the help files: L1 N1 N2 Hc=12 Br=0.2 Bs=0.4 A=...
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What is the purpose/function of this power inductor in parallel?

The inductor in question is part L3, a power inductor with both coils in parallel. Datasheet. The complete circuit is the power supply for an RFID reader, where +5V_A is the output for the antenna ...
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1answer
47 views

DC Chopper Operation in SMES Design

I'm reading a paper on a superconducting magnetic energy storage (SMES) power control system. One large superconducting inductor (L1 in the figure below) is charged up by a 10kA power supply. Once ...
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66 views

How to generate high voltage with inductor

I was tinkering with old camera circuits and I amazed about circuit generate 400v with 1.5v battery .So I wonder can(or how) I make the circuit to generate and store high voltage ? I searched about ...
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Calculate inductance for ESD protection

I am trying to use TMC2130 for drive a stepper motor that has attached with plastic pulleys assembly. According to data sheet I have to concider about ESD protection due to plastic rotating assembly. (...
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Transformer Inverter vs Inductor Inverter [closed]

I want to make a 50 kW inverter for a solar power application. The maximum solar DC voltage is 1 kV. And the output of the inverter will be 230 V AC. Now I can built it in two ways, using ...
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1answer
55 views

What happens if I interchange the position of the inductor and capacitor in this circuit?

Shown below is the circuit diagram of a boost converter. What would if I interchange the position of the inductor and capacitor in this circuit? Considering they are both storage elements, there ...
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current limiting resistor for swing circuit (indcutor (probably))

for a project I modified a lucky cat/waving cat. The only part I haven't gotten so far is that for the arm to work with power from my dev board (or similar), I would need to limit or transform 3.3v ...
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87 views

Electrons inside an LC Circuit

I am having some trouble understanding the behaviour of electrons inside an RC circuit. Let me explain: One capacitor plate accumulates a lot of electrons, which pushes electrons away into the ...
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1answer
156 views

What is this schematic symbol? Transistor ? Variable Inductor

I was looking through an old schematic and found two symbols that I didn't recognize: Is this a PNP transistor? looking up the model number doesn't give much information. Is this some kind of ...
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55 views

Adding small AC signal to a DC current using inductive coupling

Is it possible to add a small AC current on to a DC current in a wire using inductive coupling from an external source. Or if there is another way, I want to add AC ripples to a DC current. simulate ...
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64 views

“NM” Inductor or Bead label?

I do not know what "NM" indicates here under this inductor/ferrite bead label L5?
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36 views

Half Bridge Inverter Effect of Load on waveforms

I have made a half bridge inverter, in the lab and on simulation software. I have used the gate drive IR2110a and am supplying it with a square wave pulse and it is then applying the gate voltage to ...
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107 views

How to design a CMC (Common Mode Choke) footprint to allow no-pop solution

How would you design in CMC's with a 0504 (1210 metric) 4-lead package to allow for a no populate (do not pop, DNP,DNI) solution? I am thinking 0402 0ohm (zero ohm) resistor but cannot picture the ...
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Newbie questions: Calculating the time to discharge for a capacitor

I am looking to charge a capacitor using a simple DC power supply. however, I was curious how I could calculate the time until my capacitors would discharge. Also, would an inductor placed in series ...
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55 views

Magnetic induction with varying rpm: Dealing with excess energy

I would like to get some advice regarding the following scenario: I want to build a cheap, small generator for an energy harvesting application. There are magnets on a rotating shaft and off-the-shelf ...
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1answer
50 views

Sending flyback current to another inductor using crossed diodes

So, here is the context. We have two electromagnets (modeled as R1 and L1, and R2 and L2), their state is dictated by a microcontroller which sends PWM to Q1 and Q2. The signal sent to Q1 and Q2 is a ...
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Dot convention meaning

I have two questions about dot convention for the ideal transformer. I have understood how to use them in writing the voltage drops on the coils, but I have some doubts: 1) Which is the physical ...
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1answer
86 views

How to design a contactless mechanical shaker [closed]

I am trying to design a circuit to make an inductor oscillate with high-current (around 50A) at a low frequency. The inductor will act as a high-powered electromagnet. Most designs I've worked/messed ...
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27 views

Step response of Series RLC circuit

Can we solve this question by using KVL to derive characteristic equation and passive sign convention at t>0 rather than using derived formule. p.s. the response I(t) is underdamped. I am having ...
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How to choose high frequency inductors for high voltage line filtering?

I saw these inductors 680 uH (RL-1294-680) in each power line like shown below. The line to line voltage is 480 VAC. The inductor used has a saturation current of 280 mA. So I suppose I shouldn't ...
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38 views

Complete discharging of Initially charged capacitor through Inductor

I have been trying to simulate a parallel resonant circuit in Pspice . The idea of the circuit is to discharge C18 (Cin) completely (This cap is initially charged to 1.3 V) through the inductor and ...
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Finding saturation field of ferrite core from manufacturer specs

I want to wind my own ferrite core inductors for some power conversion. However, I am having trouble finding out when the cores will saturate from manufacturer's data. For example, this material ...
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80 views

Equivalent model of a real inductor

A real inductor, because of parasitic contributions, behaves differently with respect to an ideal inductor. In the following slide of a course I am studying the equivalent model of a real inductor is ...
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Figuring out Inductance

I am trying to figure out the Inductance used on this PCB. I know it's value but need to understand what type of inductor it is and other things so I can order it. The code on it ...
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86 views

Can a change in magnetic field change the impedance of a coil

I kept a coil in a linearly increasing magnetic field and calculated the impedance by measuring the induced current and voltage. When the maximum value of magnetic field was reduced (while keeping ...
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108 views

What is a power factor correction choke (PFC choke) and how does it work?

They Exist This Link at Newark displays "Power Factor Correction Chokes", which I did not know existed. I have a linear motor which I suspect really needs power factor correction. Please tell me ...
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Total phase inductance of three phase reactor

Consider a three phase reactor (inductor) using E-I or E-E laminations with phase winding on each limbs. Now inductance of R phase is given by: Lr=Lrr+Mry+Mrb Lrr: Self inductance of R-phase Mry: ...
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165 views

How do we define resonant frequency for a circuit, that has arbitrary combination of resistors,capacitors and inductors?

How do we define resonant frequency that has arbitrary combination of resistors,capacitors and inductors? For instance inductors and capacitors may neither be in series or parallel, but may ...
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52 views

(Inductor) Low-pass filter for current signal

I'm using resistors in a series circuit to vary the resistance between a constant 12V supply line and ground. Using transistors, the current either flow through all resistors, or is routed to ground ...
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49 views

Finding voltage across inductor in steady state

I am uncertain about the voltage drop I got across the inductor because of its extremely small magnitude compared to the voltage source. Was my procedure correct or were there any flaws in my ...
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1answer
42 views

Voltage regulator circuit

I am using this linear regulator and the application circuit looks like this: Is the above circuit good enough? I have a habit of putting a series ferrite bead on the input side but after reading a ...
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76 views

inductor resistor differential equation

I am trying to find the current through the inductor in this circuit. When I approach it, I get a differential equation that does not seem like something I've learned how to solve. Am I making a ...
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Modeling phase delay in high frequency resonantly coupled inductors

I am interested in simulating resonant wireless power transfer circuits similar to the ones developed by MIT and others. So far, I have been able to successfully create a basic simulation model of a ...
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1answer
64 views

Identify the element among RLC

question : A two terminal network consists of one of the RLC elements . The element is connected to an a.c. supply .The current through the element is I A. When inductor is inserted in series between ...
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1answer
45 views

Common Mode Noise on Differential Lines Driven Against Chassis GND

How is common mode noise filtered on differential lines that have a noise source that is driving them relative to chassis GND? I drew a picture of what I am imagining below. Imagine a PCB with ...
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1k views

When a current flow in an inductor is interrupted, what limits the voltage rise?

When the current flowing in an inductor is interrupted the voltage will rise until (typically) there is a flashover or insulation breakdown in the switch. Assuming extremely good insulation what would ...
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49 views

Inductor Saturation Current and Temperature Rise Current

I have an inductor at the output of my boost converter. My output RMS inductor current is 271mA and the peak switch current is 1.3A. I have selected a 22uH / 2A Inductor as we select the inductor ...
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1answer
98 views

Is Inductive Kickback Protection not necessary for AC?

For DC inductive loads, typically a flyback diode is placed over the motor so that when the current changes instantaneously it doesn't have a chance to build upon the switch contact and then create a ...
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1answer
70 views

Impedance load matching

So I've done this so far, and know one of the components is a 50ohm resistor. However I dont know where to go from here. How do i decide if its an inductor or a capacitor? This is a past paper exam ...
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2answers
50 views

Finding the voltage across a inductor in a charged RLC-circuit

Well, I've the following circuit: simulate this circuit – Schematic created using CircuitLab In the circuit I want to find the voltage \$\text{V}_{\text{Y}_1}\left(t\right)\$ as a function ...
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2answers
218 views

Inductor Symbol? What does this symbol indicate?

In the diagram below the symbol labeled L1 is described as: 1.5mH, Core: SM CM20 x 12 x 10 But what does this symbol show exactly? I have searched thoroughly and cannot find this symbol and am ...
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Maximum power transfer theorem [duplicate]

Im very stuck on where to go with this question. The examples in class used complex numbers, where as this doesn't seem to need them. Im aware that Zs = Zl, but does Zl=Cl+Rl? Any help with how to ...
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1answer
85 views

What's the purpose of the inductor in this microphone biasing schematic?

I'm just wondering what's the purpose of the inductor in this microphone biasing schematic? Could it be that I have very low input signal from the microphone because of missing L1? Bias generator ...
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89 views

Johnson-Nyquist noise for a lossy inductor?

In searching the internet for thermal noise on an inductor and I'm not finding much on the basics for a real lossy inductor. I'm interested in thermal noise for a fixed inductor in a surface mount ...