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

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Inductor and Reactive power [on hold]

how inductor behaves regarding reactive power i.e whether inductor takes LEADING reactive power or LAGGING reactive power ?
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1answer
27 views

Need help understanding the concept of “Circuit model of a discharging RL circuit”

I don't understand the statements for t<0 and t>0. Why does this happen?
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1answer
43 views

Can we determine if a filter is butterworth or chebyshev from its physical topology?

Can all analog filters be classified as Bessel, Elliptic, Butterworth or Chebyshev? Given a physical ladder topology of several stages of {L, C or LC} in {series or parallel}, is it possible to ...
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1answer
32 views

Inductor's self-resonant frequency: Do we want it to be high or low?

Inductor selection always confuses me. There is a spec for inductors as self-resonant frequency. For example, on digikey, as SR frequency of inductors increase, the price may increase or decrease. But ...
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1answer
41 views

How to know the voltages between inductors? [on hold]

I've got a schematic as below, but I don't know what voltage is a output. simulate this circuit – Schematic created using CircuitLab
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1answer
24 views

Multiple Wireless charging coils (Qi) in parallel?

I am making a device that will be wireleslly charged and I decided to go for a standardized Qi transmitter/receiver. The device is a kind of bulk and I want it to have an option to get charged no ...
0
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2answers
50 views

Op-Amp decreasing amplitude of audio signal

For a final project for an electrical engineering course I am taking (my first), we have been tasked with combining input from a small microphone and an aux cord, amplifying it, transmitting it via a ...
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2answers
52 views

Ferrite core inductor for antenna

I am going to build the inductor in the figure above. I have a ferrite core with a relative permeability of about 70. Based on ARRL formulas, I have plenty of core length to separate the two coils ...
0
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1answer
40 views

Thevenin generator of circuit with coupled coils

All i need to do here is to find equivalent thenenin U12 generator with it's impedance.Known values are: \$\ E, L_1 , L_2 , k, \omega\$ This is what i have so far: \$\ \frac{E}{j\omega L1}j\omega\ ...
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1answer
32 views

Can Irms be ignored if using Isat of an inductor

I have got the following parameters for a buck regulator and am attempting to find a suitable inductor: Vi = 3.6 Vo = 1.8 Imax = 1.5 Fsw = 56000 Iripple = 0.45 ...
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1answer
58 views

Finding inductor current at infinity

Can someone please explain how to go about solving this? I understand how we obtain Vc but when looking for the inductor current at infinity I get confused. Thanks!
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36 views

Step down converter circuit overheating

In the above circuit, the voltage is set by R7 to be about 4.1V. The coil L sets the output current to 1.2A. Input voltage is limited by C1 at 16V (approx. 14V in reality). The circuit is designed ...
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3answers
38 views

Voltage across Capacitor and Inductor with DC Voltage and Current source

As we know, capacitors and inductors are most important components in circuit design. I am just curious about how they will behave when connected across voltage or current source as per below image ...
2
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3answers
102 views

Correct placement of freewheel diode

I have two questions on placement of freewheel diode in a H-Bridge circuit: 1) In reference to the general H-Bridge circuit below, wouldn't it be safer to place the freewheel diodes directly across ...
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1answer
52 views

Maximum inductance of parallel circuit [closed]

Three inductances, 1 henry, 2 henry and L henry are in parallel. Find value of L such that the equivalent inductance is maximum. At this value of L, what is the value of equivalent inductance?
4
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1answer
134 views

Where does inductor current go when the RL circuit switch opens?

I'm struggling to wrap my head around a 'should-be-simple' problem involving an RL circuit. Referring to the image I've pasted below, what happens if we were to remove switch 1, and instead created a ...
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1answer
49 views

Output Voltage RL circuit

I'm having a lot of trouble solving this exercise. Could someone show me their approach in solving it? Could really use the help.
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1answer
34 views

Find the inductance using function generator, oscilloscope, capacitors, resistors, multimeter, voltage generator

I am trying to find the inductance of a inductor. I have tried many different methods such as putting the inductor in parallel with a capacitor to form a tank circuit and in series with a resistor ...
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0answers
20 views

Closed loop shapes with zero mutual inductance?

I have done numerous searches trying to find any mention of theory or experimentation done on determining closed current loop shapes that have zero mutual inductance and...no dice! Of course you can ...
0
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2answers
59 views

Calculating voltage spike of an inductor

Suppose there is a circuit like this where the inductor has no resistance In this circuit, if Switch 1 is initially closed, then there is 10/100 = 0.1 A of current flowing through the inductor. ...
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2answers
116 views

Inductive sensors for traffic lights

I have read that the inductors are imbedded in asphalts in small cities and this is how the traffic light detects if a car is approaching. I have two question. 1- So if they are embedded would the ...
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2answers
105 views

Solving a circuit containing a resistor and inductor in parallel

I am working on a problem involving a resistor and inductor in parallel with eachother - I am trying to work out the voltage across the inductor as a function of time. It is clear to me that I will ...
6
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3answers
2k views

Where does all energy go?

If I apply a voltage V to an inductor's terminals and wait for all transients to cease it will store an energy given by the formula: \$L \frac {i^2}{2}\$ If i remove both terminals rapidly enough to ...
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2answers
93 views

Why does current flow in circuit when dc voltage is applied to inductor?

I read in my textbook that when dc voltage source like a battery is connected to inductor,it develops an emf which opposes the increase of current in the circuit.On applying kirchoff's law in the ...
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1answer
43 views

Is it possible to make a 150 Hz resonant circuit from RF toroids?

I want to make an LC filter resonant at 150 Hz using a 2.5 uF 400 V CBB61 capacitor and inductor. They are shown in the image below. The toroid core looks like an RF toroid core but I don't know the ...
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0answers
32 views

Relation between frequency and inductor current

I have a question regarding frequency and inductance. What is the relation between frequency of an applied voltage that is square wave, over an inductor, and the average current that would flow ...
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0answers
66 views

Zener diode,Mosfet protection

I am building a circuit in order to see how to protect a power mosfet with a zener diode. This is my circuit: I have used a 560 uH inductor, 28 V zener Diode, 1K ohms resistor and a square wave ...
13
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1answer
414 views

Unconventional voltage regulation scheme in the secondary of an ATX power supply, how does it work?

The regulation scheme for the +3.3 V output in this ATX power supply schematic caught my eye as strange. I just saw the schematic online, I do not actually have the physical unit. Close-up on the ...
4
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2answers
190 views

How does this circuit work

I am looking at this circuit which converts 5V to 13V, and am wondering how it is designed. I have seen inductors being used in buck convertors, where a squre wave was used to convert and make it a ...
2
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2answers
176 views

How to determine capacitor and inductor values for parallel tank circuit?

There is the formula \$\frac{1}{2 \pi\sqrt{LC}}\$, which can help find the value of the capacitor or the inductor if one of them is known. But if them both unknown and i would like to make a parallel ...
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2answers
54 views

Reversing the direction of current in an inductor

Would it be safe to instantly reverse the direction of current in an inductor? The flow of current through it is controlled by MOSFETs. In case you're wondering, it's for a 1cm long electromagnet ...
4
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3answers
493 views

How does an inductor block frequency?

I know the basics of self-inductance, and how an inductor creates a voltage/current that opposes the increase or decrease in current. I can't find anything on how it reacts to/blocks certain ...
2
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2answers
100 views

Why am I calculating a higher current through this inductor than is being supplied?

I'm trying the find the current (using phasors) through the inductor shown below. Using the current divider rule, I got that 840+j480 uA are going through the inductor. Additionall, by Kirchoff's ...
3
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2answers
85 views

LC Oscillator Circuit Analysis

I've found this schematic of a LC sine wave producing circuit online, and I was trying to figure out how it works (particuarly the feedback cycle). Can someone tell me if this is right? I think I've ...
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2answers
636 views

How to identify filter behaviour without memorizing different topologies

Is there a way to tell if a circuit is high or low pass without memorizing different topologies?
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1answer
70 views

In this parallel RLC circuit, why is there no current flowing through the ideal RLC elements until after the switch is open?

I have a question about the following parallel RLC circuit: The text accompanying the diagram says: "We want to find i due to a sudden application of a dc current." This confused me, since I ...
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2answers
86 views

Manufacturer doesn't list self resonant frequency

To put it simply, some manufacturers don't list their inductors' self resonance frequency. I'm a bit baffled as to why they don't do this, and I have some concerns using inductors like this one on ...
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1answer
55 views

Spaced air core inductor wire size effect?

I'm intrigued by the second circuit in Spehro's answer and/or it's precursor (FM Crystal Radio) http://electronics.stackexchange.com/a/217086/33670 But I don't happen to have any 18 Ga solid wire, ...
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1answer
64 views

Noise in DC causing unwanted LC resonance

I have a circuit like this: The part on the left generates AC signal. The part on the right detects whether AC is running through the branch when S1 is closed. I use a resonating LC circuit which ...
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5answers
1k views

Why are charge pumps only used for low current applications?

Typically the most expensive (and hard to get) elements in a SMPS are the inductors. Thus I was wondering if it's possible to use inductor-less switching mode power supplies (i.e. charge pumps) for ...
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2answers
71 views

Discontinuity in the charging of an inductor

I have a buck converter without the output capacitor connected so I would able to see the current of the inductor by the voltage at the load. I'm using a IR2110 to drive the mosfet. simulate ...
0
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2answers
83 views

Estimate the value of an inductor by its steady state response

I have the following circuit: simulate this circuit – Schematic created using CircuitLab The duty cycle of each sw is 50% and the frequency is 160kHz, at steady state I end with the ...
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1answer
79 views

How calculate inductor discharge time through LED?

UPDATE Overnight I realized I'd been sleeping as I read part of the textbook I've been using or at least didn't quite fully grasp the purpose of inductor volt-second balance. I added the results of ...
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4answers
80 views

Measure indcutor ripple current in a SMPS

I need to measure the ripple current in a buck converter. In general, I add leads to the inductor and use a current probe. My issue now is that the inductor I am using has such a low inductance that ...
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1answer
50 views

AL value: nH/N² vs. nH/T²

I'm in the process of sizing some toroidal ferrites. My problem is that I am seeing the AL value on the datasheets shown two different ways as nH/N² or nH/T². Are these two units identical? I believe ...
3
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3answers
133 views

Power supply filter choke failure - how and why?

Trying to repair a non-working Fiber to Ethernet Converter. When connected to power, the unit made a hissing/sizzling/scratching sound and the all LEDs glowed dimly. I isolated a small surface-mount ...
2
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2answers
64 views

Meaning of infinite self inductance

I am reading about the characteristics of an ideal transformer and it is mentioned that self inductance of each coil is infinite. Could someone help me to understand the physics behind it? When self ...
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1answer
98 views

Maximum current to the circuit

The schematic of the wireless power transmitter is shown , The circuit works good. The inductor connected between circled nodes 1 and 1 is 24uH. (Note: both the inputs of FET are not shorted, they ...
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2answers
34 views

Can we make a simple wireless device by mutual induction phenomenon

I want to make a simple wireless device (radio?) that consists of only two copper coils where changing magnetic flux in primary coil causes a current flow in the secondary. I tried, once, with LEDs ...
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1answer
47 views

Why is inductance negative in this triphase mutual inductor?

Suppose I have a threephase circuit with a mutual inductor on the first and second phase (V2 and V3). One way of solving the circuit (ie finding the phase currents) would be the following: convert the ...