Questions tagged [inductor]

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

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Ringing in inductively coupled coils

My circuit consists of two inductively coupled inductors. A 40 kHz 600 mV sine voltage is applied to the primary inductor. The induced voltage in the secondary inductor shows some ringing in the area ...
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Buck converter waveform

It became very hard for me to understand the concepts associated with buck converter waveform. What is the role of capacitor in its output terminal? Is it used for smoothing the voltage ripple? Why ...
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What is the function of the inductor in the "Dual active bridge" DC/DC converter?

Studying the principle of operation of the DC/DC converter "Dual active bridge", I'm trying to understand what task the inductor (Ls) shown in the diagram performs. The transformer ...
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Why am I getting a sinewave output from a buck converter with an input of square wave?

I was expecting the output to stay at 1V which is the average value of (2V, 1MHz, 50%) input. It seems the capacitor is slowly charging to the input peak, and the inductor current is changing based on ...
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What's the value of an inductor marked "1K" on schematic?

I found this development module datasheet for FTDI FT4232H chip: https://ftdichip.com/wp-content/uploads/2020/07/DS_FT4232H-56Q_Mini_Module.pdf At page 9, there is the module schematic, and there are ...
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Bias tee for floating DC supply

I have a floating DC low noise current source driving a load. I also need to drive this load with an RF source but the grounds are not referenced to each other so I don't think I can use a standard ...
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Antenna connector near a shielded inductor

Is it a bad idea to put a U.FL connector near a shielded inductor? The connector is for 2.4GHz Wifi signal, the inductor is connected to the output of a buck converter with 700 kHz switching frequency....
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Coupling coefficient in function of reactance

If there are two coupled inductances L1 and L2, we may want to write k in function of the reactances, that is, in function of Z_L1 and Z_L2. How would you do so?
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Inductors: Saturation Current or Rated Current?

I am designing a 5V, 5A buck converter, and I am trying to spec my output inductor. The datasheet specifically mentions that my inductor should have an appropriate current rating, but I also wonder ...
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Switching DC battery on ideal choke?

(Google translation). A switch is activated at the instant t = 0 in a series circuit containing a battery of voltage U (ideal) and an inductor L (ideal). I am in doubt with the answers I have found on ...
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Polarity of inductor in GNSS antenna design

I was assembling a PCB today which had a circuit to connect the main module to an active GNSS antenna. I noticed that the inductor, a 47nH datasheet, had polarity markings on it, but I was unsure the ...
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Identifying an inductor

I'm trying to reverse engineer a circuit here. I have almost all of the items identified, down to their specifications, except two inductors I'm not very familiar with inductors, so I figured I'd ask ...
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Can any AC circuit be treated as DC by using complex numbers?

I am a physics undergrad, looking for ways to solve complex circuits efficiently. I have recently started to learn about complex number applications in AC circuits and its advantage over phasor ...
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RL circuit with thyristor not working as expected

I'm trying to simulate the following circuit to test how it works: The control circuit uses a PIC 18F4550. The isolation circuit, and main circuit are these: Unfortunately when I try to simulate ...
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Voltage/Current phase shift caused by capacitor/inductor

Im trying to understand exactly how a capacitor and inductor affect the RC and RL circuits and am not sure exactly what is correct. When I look online for phase shifts for these components it mostly ...
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Transient analysis of inductor circuit and back EMF

In a lecture exercise from a circuit course, I encountered the following circuit with only an inductor and a voltage source. The \$v\$ vs \$t\$ and \$i\$ vs \$t\$ graph is as follows: -The KVL ...
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Basic RL curcuit problem

So I had an exam in basic electronics, which I passed but lost a lot of points on one seemingly easy task. "Through the coil is passing a current equal to \$i_L=200\sin(10^5 t + 210°)\$. If R=5 ...
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Can someone explain the dependence of coupling coefficient to inductance value to me? It seems counter intuitive

According to the formula \$K=M/\sqrt{L_1 L_2}\$, it seems that k is inversely proportional to the inductance values of the two coils. However, it seems to me that a coupling between two 2uH inductor ...
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Finding the Gain Equation of a Boost Converter with LC Resonator

I am trying to implement the following datasheet circuit in a project. The circuit is a boost converter with an LC circuit resonator (L3 and C4 resonate). I am trying to find the DC transfer function ...
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Why do we have exactly three parameters to describe relationship between current and voltage in linear elements?

I was simply pondering over everything I learned about circuits and electricity and there was this one question I couldn't give a simple answer to. Why exactly do we need only these three parameters ...
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Building intuition on the behavior of inductors and capacitors with both voltage and current

I understand that an inductor cannot change current instantaneously, however I am not sure how that relates to the voltage. In a high pass RL circuit, for example, I know that the inductor presents a ...
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Toroid core transformer: consequences of doubling the number of turns

In a 2N3904 common emitter RF amplifier circuit that I am building, the designer uses a FT37-43 miniature core with an 8 turns primary : 2 turns secondary ratio to couple to the next stage. I ...
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2 answers
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How to read a transformer data sheet?

I have been trying to understand this datasheet but I think I am missing some core knowledge. I just want to know what the inductance of the primary is when the secondary is unloaded (I am using the ...
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How does the inductor current ripple influence a switch-mode power supply?

I am looking into several DC/DC switching controllers. When talking about component selection, many datasheets and application notes say that inductor ripple should be kept around 20-40% of the ...
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What is the correct way to solve this DC RLC circuit?

I am studying for the FE Mechanical exam and am working my way through the electricity & magnetism section. Attached is a practice problem statement I found online and am having a bit of trouble ...
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Can a solenoid be used to create resistance in a wire

Would it be possible to have a solenoid connected to a DC source be used to "slow down" the current of a separate DC circuit with a wire going through the center of the solenoid with the ...
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Why do relays, solenoids, and motors have a DC voltage across them if they're inductors?

I've never worked with or studied electro-mechanical components, but my understanding is that relays and motors are basically just inductors. If they're inductors, wouldn't they act as a short under ...
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Voltage across inductor

What is the voltage across an inductor? simulate this circuit – Schematic created using CircuitLab Is it Ldi/dt or -Ldi/dt? I am asking this because internet has confused me assume the RL step ...
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How can I replace lumped capacitor and inductor with microstrip line?

This is a spst switch working on 2.4 GHz. I want to replace the inductor and capacitors with microstrip line. What is the easy way to do that?
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What dimensions would L1 in this 433MHz tank circuit receiver be if it is actually 1.5 turns?

Specifically, this circuit from Elektor: The asterisk denotes that L1 in this 433MHz receiver circuit would be 1.5 turns. If that is accurate, what would the dimensions of the inductor air core be? ...
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Disadvantages of routing inductor in Buck Converter on opposite layer?

I am routing a TPS562202S buck regulator, using a 4.7 uH inductor. Due to space and assembly constraints, I cannot place the inductor on the same layer as the regulator. The regulator will be on the ...
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Choosing an Inductor for MAX8792

I want to make sure I chose the right inductor value for MAX8792. My step down converter should convert 12V to 1.8V while delivering maximum 3A at the output. this is a schematic that was used to ...
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Constructing Coupled Inductors with Particular Coupling Coefficient

I'm curious about the design of RF transformers with purposely designed non-unity coupling coefficient. I can see how this would be done in an IC, but how feasible is it at the discrete component ...
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LC filter input and output resistors?

I'm using rf-tools.com LC filter designer to design a passive 4 pole filter for an active subwoofer. The response is not what I expect, it's not showing any attenuation which seems to be good to be ...
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How to find current through inductor when connected in series with an ideal diode?

Please help me with this simple circuit, which is creating lots of confusion due to different results from theoretical calculation and SPICE simulation. Ques: In this circuit switch is closed for time ...
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Coupled inductors formula

Suppose we have this circuit: simulate this circuit – Schematic created using CircuitLab According to the dot notation rule the current :The convention is that current entering a transformer at ...
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how to make wire bend easier to wrap inductors?

enter image description here so obviously, the wire is thick (for a wire) how to make it easier to wrap around a core?
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Can this Noise Suppression Filter/ RF Inductor be used in buck/boost converter instead?

Say I have a buck/boost converter operating at 100Mhz. Would this inductor (VAF201610FA-841-1) be a good choice if I needed larger inductance, over other fixed inductors? (considering I do not surpass ...
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How do I see the resonance of a high-impedance coil with a VNA?

When it comes to measurements with VNA, my experience tells me that whenever there is a "dip" in the S11 parameter, your takeaway should be that there is a resonance there (this is how the ...
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3 answers
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Inductor datasheet Frequency question

I'm currently looking at SRR1240-8R2M. On the datasheet, it shows us the inductance of the inductor at 100KHz is 8.2uH. But I'm trying to run my circuit at 2.2MHz. How do I determine the inductance ...
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the sound from the coil when the current is drawn

I have buck-boost converter using a TPS630250(4.2 ->Vin) - (3.3 -> Vout) in my PCB. This buck-boost converter can draw max 4A in buck mode and max 2A in boost mode. While there is no load or ...
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Protecting capacitor from high voltage impulse spikes

The purpose of the circuit below is to produce an extremely high voltage impulse over the inductor so that I can place a spark gap in parallel to it and create a very large spark. According to ...
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Choosing an inductor for DC-DC

While simulating tps54719 in https://webench.ti.com/power-designer/, for my specific application, the simulator suggested IDC in the range 9.1A to 15.75A. Is there a logical explanation to why would ...
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Bulk capacitance equation derivation from appnote

I am looking at SLTA055 by Texas Instruments. It discusses, among other items, how to determine the bulk capacitance required for a buck regulator if a LC filter is used. Since the "L" will ...
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Inductor behavior when connected to inverter

I was working one of my project wherein i was supposed to connect inductor to an inverter and inverter's output would be fed back to inductor. However my observation is that whenever inductor is ...
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How do I find a replacement inductor?

I would like to replace what I believe is a failed inductor on a monitor board. I have searched per its marking but find nothing, SQEE13 W1. How can I identify and find a replacement? The board ...
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RCL circuit sum

Just need help in the daigram of this sum. Can't understand the daigram.will a common resistance be shared between capacitor and inductor or is there 2 resistor and 1 capacitor and inductor with ...
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2 answers
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Simulating an Old Vacuum Sensor

I have an old vacuum sensor. This sensor consists of two windings on a coil and a metal shaft that moves according to the ambient pressure and the vacuum level. The sensor is calibrated at the factory ...
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1 answer
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Explaination on phasor diagram for RL circuit?

This is the phasor diagram which I had drawn from the value of phase difference(deg) from MULTISIM. I'm a bit confuse here... shouldn't by theory, when inductance is increase, thus the degree for Vl ...
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How to generate PWM with duty cycle varying in sinusoidal fashion?

I have to regulate a sinusoidal current in an inductor. I have only a DC supply. There are many ways to do it like using stepper motor driver to regulate step wise sinusoidal in 1/256th step mode. For ...
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