Questions tagged [inductor]
An inductor is a 2 terminal passive device that stores energy in a magnetic field.
1,393
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2answers
53 views
Doubt regarding inductors and transformers
If inductors block AC then how come transformers work only on AC? Please clear my concept.
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1answer
61 views
Can similar inductor value be used?
I found a schematic online of a 433mhz receiver which I am trying to replicate.
1 component is an inductor 16.6nh smd. However because I cannot find that exact value I was thinking to use an inductor ...
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1answer
52 views
Resulting current waveform of square wave voltage applied to capacitor/inductor
If a square wave voltage waveform is applied across a pure capacitor or inductor of a given capacitance/inductance, how will the resulting current waveform look? How should I calculate this using the ...
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3answers
115 views
LC power filter, big L or big C?
I was reading a datasheet for a Murata DC-DC converter Murata DC-DC converter. It has the following LC filter recommendation to reduce output ripple:
As the output voltage of the DC-DC converter goes ...
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1answer
31 views
Ferrite Magnet as Ferrite Inductor Core?
I have a toroidal “ferrite” ceramic magnet lying around and am wondering what the similarities are (if any) between one of these that has been put in the oven to remove most of its magnetization and a ...
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1answer
38 views
Inductor value for power supply design
I am designing a power supply card using V7805-2000 for 12V to 5V conversion. In the datasheet on page number 6 they have a recommended input filter and output filter circuit. For the inductor they ...
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1answer
414 views
How to design a large 125kHz loop antenna for long range RFID application?
I am designing a large loop antenna working at 125 kHz. To maximize the range of my system I am aiming for 1m diameter loop antenna with as many turns as I can allocate (e.g. ~100 for 18 AWG). I have ...
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2answers
54 views
What happens after disconnecting DC powered inductor?
Voltage over an inductor is proportional to the di/dt.
I want to know what happens if I disconnect an inductor from a DC power suddenly.
After disconnecting no current could pass through it, right?
So ...
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1answer
37 views
internal resistance of inductor effect
I'm trying to analyze an RL Circuit .
I saw this equation for voltage drop over an inductor:
V = L * di/dt
But what about internal resistance of the inductor ?
I ...
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1answer
41 views
Chip inductors without voltage rating - how to interpret?
During the search for a suitable chip inductor I noticed, that many producers don't mention a voltage rating in the datasheet.
How to understand that? Does it mean, as long as I don't exceed the rated ...
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52 views
Helping identifying a common mode choke
Seeking help to identify the following common mode choke. The best guess is it a part from Sumida Corporation.
This part is from a refrigerator.
Any of the following information is greatly ...
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2answers
66 views
Power over coax filter selection
TL;DR - How do I determine the appropriate inductor size to filter out signals at 115.2 kHz? Is the channel frequency determined by the baud rate or the signal rise time?
Edit -10/5/2020
Looks like ...
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44 views
Unclear RF Schematic Reference for Power Amplifier Connection and Matching Network Properties
Background
I'm trying to design a device with an STM32WL series MCU using the UFBGA-73 package. There is only one reference circuit given for the RF portion of the MCU in an application note (pg. 6) ...
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1answer
50 views
How is a magnetic field generated by an inductor when supplied with a pulsed current (pulse induction)?
My question relates to pulsed induction (PI) metal detection in particular.
It is my understanding that in a DC circuit an inductor acts as a conductor with little to no energy stored in a magnetic ...
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1answer
55 views
Reducing reactive power by using a resistor
I have a school exercise that goes like this:
Voltage is 230V. Frequency is 50Hz. Inductor is 400mH.
How big of a resistor should be added with the inductor (in a series) to reduce reactive power by ...
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1answer
47 views
Using an inductor as a LF antenna
I would like to miniaturize an existing antenna I built, which is just a typical ferrite rod antenna.
When makes a ferrite antenna different from an inductor ? Can I just use a same value inductor as ...
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2answers
132 views
Switching power line phases with inductive load
I have one question related to this schematic:
Scenario:
Source 1: AC source 220VAC, 50Hz, 120º
Source 2: AC source 220VAC, 50Hz, 0º
If I want to switch from source 1 to source 2 or from source 2 ...
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2answers
323 views
Voltage in an inductor - DC circuit
I have done a simulation of a simple circuit using Multisim software to simulate the behaviour of the coil in DC circuit. The behaviour of the coil in DC circuit is shown by the below picture:
...
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0answers
42 views
Choke module in the KNX power supply, what is the purpose of the third winding?
I have a question concerning the physical interface of KNX, twisted pair.
I was wondering how the KNX (twisted pair) transceiver can produce a pulse like the following:
I thought there must be some ...
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2answers
46 views
What is the right way to measure K on an inductor with three coils?
I have an inductor which has three coils, L1, L2, L3.
In normal use L2 and L3 are connected in series, and resonated with a capacitor.
L1 would then drive the tank circuit.
In Spice, I need the ...
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2answers
45 views
Effect of secondary coil in a resonant transformer on resonant frequency
I have a friend who has asked me to help them with tuning their tesla coil. Every schematic I can find for building one simplifies down to essentially the circuit below. I recognize the primary ...
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1answer
28 views
Plannar Inductor Unacounted Parasitic Capacitance
I'm trying to determine the source of approximately 300pf worth of parasitic capacitance in a planar coil project I'm working on. I'm trying to find out how my numerical predictions line up with the ...
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1answer
103 views
Stability of input filter in SMPS - Theoretical explanation
I read the Application note Wurth Electronics ANP008c about negative resistance of a SMPS input and how to avoid oscillation when using an input LC filter. I'm asking for a theorethical clarification ...
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1answer
37 views
A parallel RL circuit being energized by a sinusoidal a.c. voltage of \$v=100\sin(1000t+36°)\$. Find total current in RMS value
The question is as follows:
\$\bullet\$In my book it is done as:
\$\begin{align}\\
i_R &=\frac{V_m}{R}\sin(1000t+36°)\\
&=10\sin(1000t+36°)A\\
&=10\cos(1000t-54°)....(a)\\
\end{align}\\\$
...
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19 views
Vgs for MOSFETs in BLDC circuits
I'm confused about how N-channel MOSFETs operate in BLDC circuits.
Say we had MOSFETs that are being driven with Vg = 10V, and DC+ is 36V. Say we have Q1 and Q4 on at some instance (Through phase A ...
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1answer
28 views
Why the inductance become L/D'^2 in buck-boost small signal model?
The slide presents a buck-boost converter's small signal model, with source disturbance set to zero. Now the effective inductance in the second figure turns out to be L/D'^2 --- why?
It makes sense ...
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1answer
69 views
How can I use an inductor as an EMI sensor?
In the paper "Synthetic Sensors: Towards General-Purpose Sensing" by Gierad Laput, et. al, they use a 100 mH inductor as an EMI (electromagnetic interference) sensor. They have not provided ...
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1answer
84 views
Noise on the PWM signal. What value of capacitor should i add to decrease the noise?
I have noise on my 60Hz PWM output. The PWM output is going to the ESC to control the motor. Below is the signal with 5V per division. The PWM signal is a 60Hz, 10V signal. The duty cycle can be ...
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1answer
53 views
DC Inductor design for boost converter
I am working on the design and prototyping of a boost conductor. With that task in hand I have to design a DC inductor for a boost converter. I am using the material EPCOS N27 since its the only one ...
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3answers
60 views
how to decide which passive component to use [closed]
i am not new to electronics and know the functions of a lot of basic components , but the problems arises when i have to use then because i dont know how to use them , when should i use a 1 ohm ...
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1answer
52 views
loop inductance of half bridge
i have a question for my class but i cannot answer it, any help to understand this question will be more than grateful.
Why it is so important to minimize the commutation loop inductance of a half ...
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0answers
21 views
How do you create an Octagonal Microstrip Inductor without a bridge/underpass in NI AWR Microwave Office?
Microwave office has a built-in element like "MOCTIND", but it has a bridge from the center and I would like to construct my own without the bridge that comes with the model. (They do have ...
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3answers
303 views
Why does the current in a transformer's primary coil change when a load is attached to the secondary coil?
I don't really know if the question is suitable to be submitted here or in the Physics StackExchange. The problem is I don't quite understand this sentence from "Practical Electronics for ...
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4answers
2k views
Why doesn't an inductor have polarity?
Let's say we have a DC source connected to an inductor. The orientation of the magnetic field through the inductor depends on which direction the coil was wrapped (right hand rule). But why do we not ...
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1answer
39 views
Inductor Voltage and Current After Switches Open and Close
I was given this problem where switch s1 and s2 are opening and closing at different times.
I have already solved for the voltages and currents, but now I need to plot vL and iL at each time. My ...
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2answers
93 views
Intuition behind Capacitive reactance?
In an LR circuit with an AC source (\$V=V_0\cos(\omega t)\$) we have that
$$I(t)=\frac{V_0}{\sqrt{R^2+(\omega L)^2}}cos(\omega t -\phi)$$
where \$\phi=\frac{\omega L}{R}\$. I find this formula rather ...
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3answers
1k views
Does Ohm's law apply in an RLC circuit?
Suppose I have the discharging free source RC circuit as shown below (I am referring to figure a, not figure b):
From this, I can easily calculate that the charge on the capacitor as a function of ...
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0answers
62 views
Best replacement for this faulty inductor from a computer power supply?
Edit: Looks like replacing the inductor resulted in the same problem, and my newly wound inductor started causing some smoke. :(
I recently acquired a faulty Corsair CX750M Power Supply that makes a ...
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1answer
81 views
Please Identify this adjustable inductor (ferrite-core bobbin)
Can anyone identify this component and suggest where to get more of them---or provide a manufacturer/model number? I need more for an HF radio project but haven't found them.
These are for hand-...
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1answer
56 views
Ferrite Choke wiring, understanding the datasheet and how it affects the signal
I've been tasked with digitising an old analogue product for my company. I'm attempting to reverse engineer the analogue circuitry with no documentation (it was designed by an outside consultancy 30 ...
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0answers
35 views
How to change input impedance electronically?
I need to simulate a wire loop in presence of a metal(usually iron) near it and without the metal.
the resistance of the wire is constant (suppose R=20ohm) but the inductance of it changes; The ...
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1answer
87 views
How to remove an inductor after getting signal from it?
In the circuit that I've designed, I get 3 different signals and I process them via a microcontroller. 2 of them are from different inductors and 1 of them is from kind of a button. So, my question is ...
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0answers
59 views
How to select an inductor for 3rd overtone oscillator SIMPLIFIED way
My question is at least approximate calculation of L1 inductor. With my design I have followed below SIMPLIFIED rules. Can someone correct any of my mistakes, if my component selection is proper? ...
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0answers
73 views
How to increase the peak current to 12 kA in my circuit?
I am simulating a circuit with a capacitor bank. I am getting maximum peak current to 8.8kA.
I need to know how can I increase the peak current to 12-15 kA without increasing the input voltage. The ...
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0answers
77 views
Can I avoid tripping my breakers with an superinductor?
I was thinking about creating a circuit with a large inductor to avoid tripping my breakers when I turn on an iron.
When I use the iron, if I slowly start it with minimum heat and gradually increase ...
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2answers
61 views
Determining acceptable single-pulse heating in a wire coil
I'm trying to determine the max heating allowable in an insulated copper inductor. This is a pulsed application where peak current in the 5kA range is delivered over <1ms. My task is to figure out ...
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3answers
293 views
Why does this diagram reject self-resonance behavior for RF chokes?
Based on this tutorial, after self-resonance the impedance decreases and the inductor behavior becomes a capacitor. But for a real inductor (Murata RF choke):
What is the minimum self-resonance ...
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71 views
I've built dead bug (on steroids) boost converter
I know it looks sloppy but this is my very own homemade boost converter! It outputs 6watts of power from a 3.7v battery(phone battery)...
It's switched by an astable multivibrator, and the switch is ...
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1answer
61 views
How does the secondary coil affect the Q of the primary coil?
This is an LC tank circuit in which load resistor \$R_L\$ is link-coupled through the inductor:
My textbook stated that:
Link coupling is another way of coupling the signal to a small load ...
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2answers
57 views
current analysis with pre-carried current in the inductor .- confused
The direction of the reference i(t) current is certain. When we add the pre-existing currents, it will be -12 amperes, thats okay. But why did we multiply it by - (minus) when we integrating the ...
