Questions tagged [inductor]

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

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Inductor saturation current

im trying to determine an inductor's saturation current, i use a pwm with a gate driver (tlp250) and a 0.4 sense resistor at the source which i prope across to capture the current waveform. I salvaged ...
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How should I understand back-EMF in an inductor?

I have a circuit made of a MOSFET that pulls the lower side of an inductor to ground while the other side is connected to a DC voltage source as follows: Then it is very simple to describe what's ...
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find the voltage and current of inductors and capacitors

I have a questions where I am trying to find the voltage and current across the inductors and capacitors under DC conditions in a circuit shown below. I currently have found the current and voltage ...
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How to tell a inductor's self-resonant frequency if its not mentioned in datasheet

I was looking at AIRD-03-221K inductor (a second datasheet here), and noticed it does not mention its self-resonant frequency (SRF). Of course, it mentions the frequency they tested it at, its 100Khz, ...
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Capacitive sensing vs inductive sensing Comparison [closed]

Apart from this technology being implemented with 2 different passive components, what are the major difference between the 2?
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In DC-DC converters, how can the ripple current affect the circuit's performance?

I have a DC-DC buck boost converter (TPS55288) that I was planning on using for a project. I'm making a revision to my current heated gloves, and my circuit needs to be as small as possible since the ...
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Determining an industrial electromagnet coil's number of turns and wire diameter, etc

I'm a new graduate and fresh hired Electrical Engineer who works in a company building magnetic separators for general industry (including mining, recycling etc.) Normally, we build magnetic ...
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LTV and NLTI capacitors and inductors' basic relations

Are the famous differential relations of inductor and capacitor true for Linear time-variant (LTV) inductors and capacitors? How about non-linear time-invariant (NLTI) ones? $$V_\text{L}=L\frac{dI}{dt}...
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Will the current able to flow or capacitor able to work in this circuit?

If the switch is closed, how does the capacitor work in this condition? I know that the main source is shorted. How about the capacitor? Will there be current flowing from the capacitor through the ...
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Transformer with only three wires from an APC UPS [closed]

I was taking apart an older APC UPS and found a big transformer in it. The label says CLASS 130(B) NER-B82 430-0144 from Shenzhen Jingquanhua Electronics. DB-E186-3107A E208707. When I looked it up ...
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Inductor behavior in DC circuit

An inductor in a pure DC circuit once steady state is reached has a zero volts across it. In the figure below, the inductor will have a voltage which is not zero Why isn't VL zero?
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Inductor selection for POL application

I'd like to add two AP6320x based DC-DC converters to small MCU board, for 3.3V and 5V. Since inductor is usually a critical component I wanted to do it right. Also, it would be nice to use inductors ...
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Why common-mode choke on differential-signal serial lines?

I have 2 questions: Why using a common-mode choke on serial communication lines (like CAN, RS485) if the signal is differential? Wouldn't the common-mode noise simply be cancelled in the receiver? I ...
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Can an air core inductor cause a buck converter to malfunction because of EMI?

I am trying to build a buck converter circuit using the LM2596T. While reading its datasheet, it came to my attention that EMI is a potential problem one should not ignore while designing a buck ...
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Using a high DCR inductor instead of resistor in LED/Zener voltage reference?

I need a very simple, low noise Zener or LED voltage reference that will be fed by a potentially noisy (RF) voltage source. Focusing on low noise, I was thinking of adding an LC filter before or after ...
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Is there a formula to calculate the saturation current of an inductor or is it only obtained experimentally?

I want to make an inductor for my buck converter since I cannot obtain the recommended inductors for the LM2596. How do I calculate the saturation current for this inductor if I use a ferrite core? ...
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How do I stop buck converter voltage from dropping whenever current increases?

I built this buck converter circuit using the LM2596T-5 (5 V OUTPUT, 12 V INPUT) using the exact components mentioned in the datasheet's first page (schematic below), except for the diode. I used the ...
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Why are pull-up inductors biasing the power amplifier output of radio transmitters chips needed?

I have seen many designs where the antenna/PA output is fed DC voltage through an inductor. Why not leave it out and feed the DC bias directly? It is L1a in the diagram below: There are some values ...
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Can a low side L-spike destroy a turned off microcontroller through its ground pin?

I am working on a low power project involving servo motors and an STM32 Bluepill MCU board and I was wondering if it was necessary to place a free-wheeling diode as shown in the schematic below (D1). ...
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Inductor voltage rating for SMPS

I am making a 500 V voltage supply using DC-DC boost converter from 5 V. Apparently inductors have maximum transient voltage rating to prevent the breakdown of the wire insulation material or the ...
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3 answers
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Is this explanation of a common-mode choke correct?

I am trying to understand how common-mode chokes work. I get the basic concept: the signal lines are joined by a transformer, such that each line will aid or impede current in the other. But I am hazy ...
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Why might one of these decoupling capacitor schematics also include an inductor and the other not?

I am looking at a third-party schematic (centered around a small IC) and it includes a selection of power schematics. They connect between a general 3.3 V supply and various other users of 3.3 V. In ...
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How do skin-effect and proximity-effect behave for flat-conductor power inductors?

Here is a Digikey search showing flat-conductor power inductors. And here is a picture of three power inductors found there: In this answer, by Rohat Kılıç, towards the end of his answer he explains ...
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What precisely is the numerical (or any) meaning of mutual inductance and, is it useful, representative (of something) or important?

When we consider two inductors that are magnetically coupled, we sometimes talk about mutual inductance. As an example, consider two inductors (such as 9 μH and 4 μH) that are 100% coupled and produce ...
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Why is the inductor's voltage not specified in the datasheet?

I looked through a few inductors' datasheets and in none of them is the maximum voltage specified. Even Mouser does not let you filter inductors by voltage. Why is that? Is inductor voltage "not ...
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Why does inductor core saturation depend on the temperature?

For example at room temperature (20ºC) the saturation current is 450mA and with 100ºC the saturation current is 350mA. What causes this? (Edit) The higher inductance with higher temperatures and lower ...
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How to use an LC stage as a voltage amplifier?

What I have done From my simulation here, I have tried using a parallel LC stage as a voltage amplifier at resonance. $$f = \frac{1}{2\pi\sqrt[]{LC}}$$ $$L = 0.001$$ $$C = 10 \cdot 10^{-6}$$ $$\...
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What are metal composite inductors made of?

I am currently studying different types of inductors and core materials. For most materials I can find a wikipedia page or other sources which describe what kind of alloy is used, for example ...
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Question about inductors in the form of magnetic fields [closed]

Could you please explain this sentence: Inductors build up energy in the form of magnetic fields, and become more conductive.
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Thevenin of DC circuits with inductors and capacitors

Can I use Thevenin's theorem for DC circuits containing an inductor or capacitor upon application of Laplace transform - bringing the entire circuit to the \$s\$ frequency?
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Need help with a resonant frequency question

I DON'T WANT THE SOLUTION I just don't understand where the "100" (highlighted) came from.
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Calculating the induced voltage by an inductor

I was given the following problem in a textbook. My teacher reviewed the problem for the class and I was presented with, what I suspect is, a wrong answer. I am asking here to see if my own reasoning ...
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2 answers
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Time based solution of an LC circuit at resonance

I am trying to solve for the voltage across the capacitor in an LC circuit driven by a sinusoidal voltage at the resonant frequency, \$\sqrt{\frac{1}{LC}}\$. My solution contains a scaling factor of ...
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2 answers
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What is this flange on an inductor?

Usually I have seen pads beneath inductors. What is the purpose of this flange on an inductor? Why is it constructed like that? Context: I am looking for low profile inductors (<1.2mm) and ...
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Inductor identification

Please help; I am not able to identify this inductor from its bandings; I've never had to replace one before. This is from the Toyota SRS Airbag Sensor Array in a 1996 Toyota Granvia. The Sensor has ...
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Why do diplexer low-pass filter output have more inductors than capacitors and vice versa?

I am reading "Practical Radio Frequency Test & Measurement A Technician's Handbook" by Joseph J. Carr. On page 41, it has a diagram (figure 2.29 shown below). In that figure, why do ...
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Reason for using small sampling resistors in voltage measurement circuits

The above schematic is of the ZMPT101B module (current type voltage transformer) collected from Arduino Forum. All of the modules available in the market use a similar type of circuit having two ...
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I’m working with pcf7991at antenna driver ic

Just wondering if you can help me I’m trying to calculate capacitor and resistor values for a 125khz inductor coil . My coil measures 6.8 ohms. I’m not sure how to calculate the capacitor values ...
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Why the output voltage of no-load boost converter is increase continuously?

I'm designing the boost converter with 3 mH inductor and 680 uF capacitor 20 kHz fequency. When I try with 12 V, 5 A power supply in the input and fixed 50% duty cycle, I can reach the 24 V output ...
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What is the definition of ILac in following diagram and calculations?

The attached diagram and calculations refer to following application note: AN2761 Application note Solution for designing a transition mode PFC preregulator with the L6562A I don't have any idea about ...
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Calculate Lq and Ld of a motor with HFI

I have seen several papers, where Lq and Ld are calculated by injecting a rotating voltage vector for Vd or Vq at a fixed frequency. I already made an implementation on a controller and it seems to ...
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1 vote
3 answers
475 views

Driving a Peltier element with PWM

I'm trying to drive a Peltier element using the VNH2SP30 motor driver, switching at the Arduino's PWM frequency of ~970 Hz (which is extremely low, but I'm planning on increasing the driving frequency ...
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Multi-phase buck converter inductor selection

This question is regarding the inductor design (uncoupled) in a multiphase buck converter. In a multiphase converter, the inductance per phase requirement is higher than the corresponding single phase ...
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How we select LC filter for MAX3221?

I have seen a schematic where they used MAX3221IPWRG4 (Texas Instruments), RS232 Driver and Receiver. There they have used LC filter of inductor value 0.68uH and capacitor value of 680pF, but in ...
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Mutual Inductance Practical Explanation

I can't understand why the Mutual Inductance is measured in Henry. The self inductance of a coil is the abillity that has a coil to create a magnetic field that produses a voltage on itself so to ...
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Flyback transformer size vs. core losses

I'm in the process of compiling some notes on inductor design. I have good hands-on experience in the field (excuse the pun), but I feel this experience hasn't been totally systematic. I have been ...
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2 answers
120 views

Why does large volt-second product need a large inductance?

This is a buck converter that converts from a high input voltage VIN (60V) to a low output voltage (3V). I read that because this case has a large voltage-second product we have to use a large ...
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1 vote
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Power supply filtering of ICs

My question is - why in 99% of designs we dont need to provide RC filter to the power supply of IC, just individual capacitor is required? I know, that paths does have some resistance, but still, the ...
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4 votes
1 answer
247 views

Values at t=0- and t=0+ when closing switch; Circuit Analysis

I have a circuit as shown in the schematic and need to find out the values at t=0- and t=0+ but I don't understand it correctly. The condition is that the switch was open for a long time and closes at ...
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4 votes
2 answers
578 views

Reduce coil whine in LED driver

I have designed a PCB to control RGB LEDs at various intensities using the PWM input to an ALW8808WT-7 driver from an STM32RCT MCU. The 33 uH inductors in my prototype board let off an awful whine ...
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