# Questions tagged [inductor]

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

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### Does all the current lag the voltage in an inductor or is it only a small component?

the way I understood a basic inductive circuit (voltage source + inductor) is that all the circuit current (Io) lags the voltage by 90 degrees. However, I am following this blog tutorial to refresh ...
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### DIY Wireless charger isn’t working

For some reason by LED won’t light up, meaning no current is being induced in my second coil. I am trying to convert DC into AC voltage using this LC tank oscillator. I have the first coil center ...
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### How to deal with one inductor coupled with two different inductors?

I'm fairly confused on how to deal with this type of a situation. I can easily solve circuits with one simple coupled inductor, but this case is obviously different. The task is to solve for the ...
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### Why is the voltage across a capacitor in the Laplace domain equals I(s) / s?

The original transfer function is I(s) over V(s) for a basic circuit that contains a resistor, inductor and a capacitor with a voltage source (Basic RLC circuit) where R is the resistance of the ...
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### Complex equations in AC RLC circuits spiralling out of control

I'm trying to solve the following circuit. I tried using superposition to find Thevenin at V_o. First I solved for V_o with the current source and dependant source, then I solved for V_o with the ...
1 vote
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### Is ferrite core inductance similar to iron?

My 0.5" (1/2 inch) iron core inductor did not have a high inductance due to (I assume) eddy currents. Theory seems to suggest that ferrite cores are the ticket to increase inductance. I ordered ...
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### Power supply coupling of inductive resonant sensors

I'm working on an array of sensors based on Peltz Oscillators connected to a micro to detect objects based on shifts in resonant frequency when a target object gets close to the inductor. In isolation,...
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### Can a 6V DC circuit turn on a separate/unconnected DC circuit?

Can a 6 VDC circuit be configured to switch on a second, separate 3 VDC circuit? I had thought that an inductor's magnetic field could be used to close a normally-off reed switch, as illustrated in ...
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### Inductor not behaving even close to calculation

I wrapped a coil around a 1/2 inch X 6 inch pure iron rod. The coil is composed of #22 enameled copper and about 393 turns. 393 turn coil around a 0.5 inch (6 inch long) supposed pure iron rod: This ...
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### Inductor Boost Converter w/ controller

In my boost converter I am seeing the inductor burn after some uses. I am still completing some bench testing but I am hoping my theory of why it is burning is correct. My theory is since this MOSFET ...
1 vote
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### Can I make an inductor rated 75mH 40A from an induction motor?

For my test bench, I am trying to implement an inductor that meets the requirements below. I have tried to purchase it outright as a made-up item, or the parts to make it (core and windings), but ...
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### Derivative of the current through a resistor in an RLC circuit

I have a circuit where I have to find di/dt at t=0+. At t=0+ the capacitor would have 0V across it and the inductor 0A through it. I was thinking of doing nodal analysis at the top and then ...
1 vote
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### How does this oscillator circuit work? Inductor phase

I simulated in it LTspice software. The voltage waveform across capacitor C4 was sinusoidal. I know its some kind of oscillator but don't know how it's operating? I think the reason behind center ...
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### Understanding inductance and its dependency with frequency

I am trying to understand how to design an inductor that has constant parameters over a wide range of frequencies. Especially over high frequencies because I want to use them for impulse testing ...
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### Flyback transformer with no load situation confusion

I am having a slight confusion in the no load situation of the flyback transformer. Consider the high pulse at the gate of the mosfet turning on the switch. At this case the current will increase ...
1 vote
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### Can I use a higher current rating and saturation current rated inductor in place of a lower current rating and saturation current rated one?

In the datasheet of a DC-DC Converter IC, a specific inductor is mentioned, but that one is out-of-stock on the website I am buying electronics. So, I wanted to replace it with another inductor. But ...
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### How does this oscillator circuit works? [duplicate]

When the switch is closed, the current flows through the resistor and because of it high amount of current flows through lower portion of the coil and led turn on. In the meantime, because of the ...
22 views

### Litz Wire Calculation [duplicate]

I want to use Litz wire for my Inductor Peak Current = 15A Current Density = 5A/mm2 My supplier has told he has 0.1mm diameter strands. How should I determine number of strands and Cross section Area ...
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### Adding inductance in order to make AC offset

everybody The task was to introduce a 10 MHz AC signal to the output along with the 24 DC voltage. If I directly connect DC to the circuit, at the output (75 Ohm resistor) I get the straight line =>...
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### How does this oscillator circuit with a transformer work?

I know it is an oscillator circuit but I don't know how it works. This circuit is supposed turn the LED on and off continuously. Can you please explain it to me? The star sign in the figure is not ...
58 views

### Boost Inductor Design for three phase Diode Bridge Rectifier for PFC operation

I am doing a simple DCM based control for power factor correction. Please see the topology below . Specifications are as below: 1.) Power 5KW 2.) Input Voltage is 415V L-L Nominal 3.) Inductor ...
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### Resonant Coupling for Optimal Power Transfer

I am trying to read the following paper: B. L. Cannon, J. F. Hoburg, D. D. Stancil and S. C. Goldstein, "Magnetic Resonant Coupling As a Potential Means for Wireless Power Transfer to Multiple ...
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### An unknown SMD inductor on DVD PCB

Here is PCB taken out of Eplutus portable DVD player. Broken SMD inductor is soldered out because it is cracked in half. It is L 46. I need to know its parameters/values.
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### Don't understand a symbol in this circuit

I'm trying to fully understand this circuit. I don't understand how the connection from the power source is going into the center of this coil. What does this represent? The circuit is for an ...
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### Variable inductor

How can I design a variable inductor with a closed core? It should be used in flyback topology so I need it to be a low leakage. My idea is to use rectangle shape (CI core.) One leg will be movable ...
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### Maximum inductor current ripple in an inverter circuit

The following is the maximum current ripple of the system in the figure below: In the system in the figure below, how is the maximum current ripple for L1 derived? I know that diL/dt = DVL/(Lfsw) ...
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### Boost Converter 9v to 450v as Capacitor Charger

I recently decided to build a simple single-stage coilgun that is triggered by a SCR. For that, I had to design a low-power boost converter that only draws around 2 W at 9 V so I can power it from a 9 ...
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### Immo coil - Resistance, Reactance and Impedance - Differences needed

Since I work in an automobile lock manufacturing company, I was measuring the DC resistance of an Immo coil using a multimeter (used in automobiles for security purposes) and found out the value was ...
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### Inductor in DC circuits

I've been studying about inductors lately, so I'm going to tell you how inductors work based on what I understood, please correct me if I'm wrong. As soon as the switch is closed (in a DC circuit with ...
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### Inductor in buck converter

I have a couple of questions regarding the switching inductor in a buck converter. Is it normal for the switching inductor in a buck converter to heat up? In my circuit, it reaches around 65 Celsius. ...
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### How a short circuit changes when an inductor becomes short circuit?

I have the following circuit from the book Electric Circuits Nilsson & Riddle chapter 7. The switch in the circuit in picture has been closed for a long time, which means that the inductor behaves ...
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### Why is it OK to separate a circuit in the process of simplifying it?

Suppose the switch was closed for a very long time. Why is it ok to separate the circuit like this?
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### Transient analysis with charged and uncharged inductor in series

I have to do transient analysis in the following circuit. When t<0. L2 inductor is effectively bypassed and 10A flows through inductor L1. At t = 0+ L1 behaves as a current source outputting 10A ...
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### Turns of inductor relation with phase shift

I have a question regarding the phase shift produced due to an inductor. I have seen some inductor coils that have only 2-3 turns on the core. Some have only one as shown below. It is known that an AC ...
1 vote
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### Why is the output of a boost converter (shown on many waveforms) square like across a real load, when the current is triangular?

I am trying to learn about boost converters, but I don't understand why the images of the voltage output always seems to be like a square wave PWM. I understand that 1) (assuming perfect inductors) ...
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### Why is the output voltage (without capacitor) of a boost converter seen as a perfect square wave?

I am trying to learn about boost converters, but I don't understand why the images of the voltage output always seems to be like a square wave PWM. I understand that assuming perfect inductors, the ...
124 views

### How far away can my flyback diode be from my inductor?

I have a relay that turns on a dc valve that is connected to it by an electrical socket. Will there be adverse effects if I put my flyback diode near the relay, leaving about 12-18 inches of wire from ...
1 vote
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### Inductor datasheets not showing impedance vs frequency plots

I regularly come across datasheets for inductors that do not mention the impedance vs frequency plot. I am starting to think that maybe the DC impedance does not change (much) up to a certain point in ...
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### The idea of voltage in the ideal inductor equation

In a book that I have been reading (Practical Electronics for Inventors 4th ed by Paul Scherz and Simon Monk), I came across the equation on pg 129 for for inductor $$V_L = L \frac{di}{dt}$$ where ...
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### Why are inductor properties given at specific frequency only?

Here is an excerpt of an inductor datasheet from RS Components for Shielded metal composite power inductors: All the tables have a test frequency. Does this mean that the inductance value, DC ...
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### Why don't we call ferrite bead and choke as just an inductor?

Ferrite bead and choke have inductance which means they have high reactance for higher frequencies and dissipate their power as heat. Why do we use different term like ferrite bead and choke and now ...
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### State space model of third order circuit

I'm trying to derive a state space model for this circuit: - simulate this circuit – Schematic created using CircuitLab The circuit contains four energy storing elements, but is only of third ...
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### Why is the Voltage after Inductor discharging, the Voltage 24V?

As seen in the schematic, V2 (SUM75N06-09L) is switched off and then L1 is discharging through D1 and D2. After discharging the voltage at node vn003 (marked in schematic) is at 24V. Can anyone please ...
1 vote
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### How Far Should Mu Metal Be From An Inductor to Leave Its Internal Behavior Unchanged?

I have an air core inductor. Since its magnetic field will be large, and it will turn on and off rapidly, I assume it will make a lot of noise. I don't want that noise to disturb the PCB's nearby, so ...
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### Is there a difference between laminated steel for transformer and inductor?

Does a material (compounds) of laminated-steel core varies if used for transformer vs. inductor. Both for 50Hz. Also is there any other differences?
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### Changing DC voltage through an inductor

What happens if I apply such changing DC signals (Voltage) to the inductor on one end? I read somewhere that by applying such signals on one end of the inductor will result in the average values of ...
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### Generating high current at low voltage from DC voltage supply

Main Question: What role do inductors play in allowing an 8 volt, 2amp max power supply, to power a 2.7volt 6.5amp resistive load? Details: Out of boredom / convenience I converted an old e-cigarette ...
1 vote