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

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Solving a source free series RLC circuit

How do I proceed to solve this problem. If I write a KVL equation, I get $$4 (4 Vc) +1/10^-3 integral i dt - 10=0$$ What to do next?
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29 views

Finding the current through resistor in source free parallel RLC Circuit for t>0

My solution: Since alpha >w0, so response is overdamped. Current through inductor:$$ Il(0-)=Il(0+)=6 $$Voltage across capacitor: $$Vc(0-)=Vc(0+)=0V$$ Current through resistor: $$ Ir(t)=A1e^{s1t} + ...
3
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2answers
39 views

LC circuit of buck converter in nRF8001 datasheet

In the datasheet of the nRF8001, they specify in the reference schematic (page 51) the LC circuit to use with the integrated DC/DC converter (see below). Why is there a small inductor L5 in series ...
6
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4answers
237 views

What is a flyback?

Trying to find this answer is so difficult that I can't even tell whether What is the difference between a transformer and a coupled inductor? is asking the same thing. Some reading suggests that a ...
0
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2answers
43 views

Inductance values over the frequency

Does inductance vary over frequency in passive components. Consider a Coax cable for example, does the inductance value change as a function of frequency, lets say from 5GHz to 100GHz, does the ...
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1answer
45 views

Inductor Value Reading

I see these values written on inductor symbols on the schematic of an RF filter/PA, what to make of these values? a) what does "4T1.5D*0.31" means? b) what does "CM" means in this expression ...
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3answers
102 views

How was this equation for finding current written?

It doesn't make any sense because at \$t\gt 0\$ the two circuits are disconnected (the left and right portion). How has \$25 i_x\over 20\$ been calculated?
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1answer
66 views

Remove the load of buck converter

I have a buck converter that is delivering 6A to a load of 3ohm load. I'm measuring the output current and stop increasing the dutty cicle when the current reach 6A, at this moment the output voltage ...
0
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1answer
55 views

Does the physical distance from electrolyc capacitor to inductor matter?

I am designing simple LC circuit (L=470uH, C=1000uF) for 12V / 12A (1 Ohm load): As you can see, I did do some soldering already (without too much or noob thinking). The capacitor and inductor ...
0
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2answers
31 views

can ct sensors share a common fixed reference point?

In a previous question, I asked how to amplify a CT sensor, essentially a small transformer that induces a voltage proportional to the current in the primary circuit. The solution has one leg attached ...
0
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0answers
24 views

How do I design an antenna in desired frequency with preset equivalent circuit model?

I am working on a project that an oscillator drives 1 mH inductor in 7.5 KHz. This oscillator also happens to be very efficient. However, I am constrained with inductor value. So, to make my design ...
3
votes
3answers
369 views

Power MOSFET gets hot while driving Peltier by step-down buck voltage converter

I have a TEC1-12712 Peltier element, which I am driving using Arduino microcontroller through IRFZ44N and buck step down converter (to smooth PWM). Overall, circuit consists of: 12V, 8.5A max DC ...
2
votes
1answer
60 views

Finding the resistance of a practical inductor having its reactive power

Suppose I have a simple practical inductor as such: simulate this circuit – Schematic created using CircuitLab L is known. R is unknown and we need to find it. The supply frequency (say ...
2
votes
1answer
50 views

How to select a gate driver transformer

I designed a Half-Bridge power supply using Gate Driver Transformers to drive my two MOSFETs. It's working great, I winded the two transformers around very small toroids with some turns, I didn't ...
0
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0answers
26 views

What are the risk of overload a inductor in buck converter?

I've a buck converter working at 100kHz simulate this circuit – Schematic created using CircuitLab So far I have tested the circuit for a 4A output current, but I may need to work with ...
2
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2answers
115 views

Operating an inductor beyond its rated current

Let's assume the following situation: there is a power supply which VCC line has an inductor between some capacitors, for additional filtering capabilities: simulate this circuit – ...
0
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1answer
47 views

Inductor waveform not increasing when supply is increased

I am building and testing the transmitter side of a wireless charger. The image below is a rough representation of what I am doing, U1 is powered by an IR2110 driver at 5kHz off a 555. V1 is 30VDC ...
0
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1answer
59 views

Propagation Delay due to Ferrite Bead [closed]

When I pass a 33MHz 'Square Wave' through 3 ferrite beads connected in series, 742792606 (from Wurth), I see that the output wave turns 'Sine' in form. Also there is a delay as it propagates through ...
0
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1answer
24 views

Current in circuit with switch [closed]

Switch is open in this circuit. How do I know that current IL (inductor) is 0 and voltage(Uc) of capacitor is 0 when the switch is open(t<0)? Can someone explain me this as simple as possible.
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4answers
70 views

I have a question about the working of an inductor..

The inductor develops magnetic field around it to store the kinetic energy of the electrons into magnetic field, but i don't have a clue why does it opposes the change of current passing through it ...
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0answers
36 views

Finding current in the inductor - Easier Integration method exist?

Based in the formula given V, $$ i = \frac {1}{L}\int_0^t Vdt +I_0$$ How would you tackle this integration without having to do integration by parts every time i try to solve this problem? Since V ...
0
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1answer
40 views

Default unit for inductance

I received a schematic with many inductors marked "600". These are small chip inductors for filtering spikes on audio and GPIO lines on a sound chip. The default value for the resistor is simply the ...
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0answers
30 views

Lossy inductor coil

I have the electrical homework such as the following: A voltage of 200 V is applied to a pure resistor (R), a pure capacitor, C and a lossy inductor coil, all of them connected in parallel. The ...
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2answers
70 views

unknown component in datasheet

im using xl6009 dc to dc converter , in page no 7 of datasheet the sepic inverting topology is show which generates 12 and -12v .my doubt is what component is used, is it a transformer or coupled ...
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1answer
29 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
46 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 ...
0
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1answer
50 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
42 views

How to know the voltages between inductors? [closed]

I've got a schematic as below, but I don't know what voltage is a output. simulate this circuit – Schematic created using CircuitLab
0
votes
1answer
32 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
votes
2answers
53 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
63 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
46 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\ ...
0
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1answer
36 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
62 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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40 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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votes
3answers
49 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
votes
3answers
108 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
54 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
votes
1answer
141 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 ...
-1
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1answer
51 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.
0
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1answer
36 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
22 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
68 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. ...
0
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2answers
168 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 ...
0
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2answers
119 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
votes
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 ...
0
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2answers
95 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 ...
0
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1answer
46 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
34 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
72 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 ...