Questions tagged [inductor]
An inductor is a 2 terminal passive device that stores energy in a magnetic field.
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Complete discharging of Initially charged capacitor through Inductor
I have been trying to simulate a parallel resonant circuit in Pspice . The idea of the circuit is to discharge C18 (Cin) completely (This cap is initially charged to 1.3 V) through the inductor and ...
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3answers
32 views
Finding saturation field of ferrite core from manufacturer specs
I want to wind my own ferrite core inductors for some power conversion. However, I am having trouble finding out when the cores will saturate from manufacturer's data. For example, this material ...
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2answers
76 views
Equivalent model of a real inductor
A real inductor, because of parasitic contributions, behaves differently with respect to an ideal inductor. In the following slide of a course I am studying the equivalent model of a real inductor is ...
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34 views
Figuring out Inductance
I am trying to figure out the Inductance used on this PCB. I know it's value but need to understand what type of inductor it is and other things so I can order it.
The code on it ...
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2answers
68 views
Can a change in magnetic field change the impedance of a coil
I kept a coil in a linearly increasing magnetic field and calculated the impedance by measuring the induced current and voltage.
When the maximum value of magnetic field was reduced (while keeping ...
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3answers
67 views
What is a power factor correction choke (PFC choke) and how does it work?
They Exist
This Link at Newark displays "Power Factor Correction Chokes", which I did not know existed. I have a linear motor which I suspect really needs power factor correction. Please tell me ...
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28 views
Total phase inductance of three phase reactor
Consider a three phase reactor (inductor) using E-I or E-E laminations with phase winding on each limbs. Now inductance of R phase is given by:
Lr=Lrr+Mry+Mrb
Lrr: Self inductance of R-phase
Mry: ...
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5answers
153 views
How do we define resonant frequency for a circuit, that has arbitrary combination of resistors,capacitors and inductors?
How do we define resonant frequency that has arbitrary combination of resistors,capacitors and inductors?
For instance inductors and capacitors may neither be in series or parallel, but may ...
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35 views
(Inductor) Low-pass filter for current signal
I'm using resistors in a series circuit to vary the resistance between a constant 12V supply line and ground.
Using transistors, the current either flow through all resistors, or is routed to ground ...
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46 views
Finding voltage across inductor in steady state
I am uncertain about the voltage drop I got across the inductor because of its extremely small magnitude compared to the voltage source. Was my procedure correct or were there any flaws in my ...
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1answer
39 views
Voltage regulator circuit
I am using this linear regulator and the application circuit looks like this:
Is the above circuit good enough?
I have a habit of putting a series ferrite bead on the input side but after reading a ...
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3answers
61 views
inductor resistor differential equation
I am trying to find the current through the inductor in this circuit. When I approach it, I get a differential equation that does not seem like something I've learned how to solve. Am I making a ...
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Modeling phase delay in high frequency resonantly coupled inductors
I am interested in simulating resonant wireless power transfer circuits similar to the ones developed by MIT and others. So far, I have been able to successfully create a basic simulation model of a ...
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1answer
55 views
Identify the element among RLC
question :
A two terminal network consists of one of the RLC elements . The element is connected to an a.c. supply .The current through the element is I A.
When inductor is inserted in series between ...
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1answer
38 views
Common Mode Noise on Differential Lines Driven Against Chassis GND
How is common mode noise filtered on differential lines that have a noise source that is driving them relative to chassis GND? I drew a picture of what I am imagining below. Imagine a PCB with ...
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5answers
1k views
When a current flow in an inductor is interrupted, what limits the voltage rise?
When the current flowing in an inductor is interrupted the voltage will rise until (typically) there is a flashover or insulation breakdown in the switch. Assuming extremely good insulation what would ...
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2answers
28 views
Inductor Saturation Current and Temperature Rise Current
I have an inductor at the output of my boost converter. My output RMS inductor current is 271mA and the peak switch current is 1.3A. I have selected a 22uH / 2A Inductor as we select the inductor ...
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1answer
71 views
Is Inductive Kickback Protection not necessary for AC?
For DC inductive loads, typically a flyback diode is placed over the motor so that when the current changes instantaneously it doesn't have a chance to build upon the switch contact and then create a ...
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1answer
60 views
Impedance load matching
So I've done this so far, and know one of the components is a 50ohm resistor. However I dont know where to go from here. How do i decide if its an inductor or a capacitor?
This is a past paper exam ...
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2answers
44 views
Finding the voltage across a inductor in a charged RLC-circuit
Well, I've the following circuit:
simulate this circuit – Schematic created using CircuitLab
In the circuit I want to find the voltage \$\text{V}_{\text{Y}_1}\left(t\right)\$ as a function ...
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2answers
215 views
Inductor Symbol? What does this symbol indicate?
In the diagram below the symbol labeled L1 is described as:
1.5mH, Core: SM CM20 x 12 x 10
But what does this symbol show exactly? I have searched thoroughly and cannot find this symbol and am ...
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0answers
38 views
Maximum power transfer theorem [duplicate]
Im very stuck on where to go with this question.
The examples in class used complex numbers, where as this doesn't seem to need them.
Im aware that Zs = Zl, but does Zl=Cl+Rl?
Any help with how to ...
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1answer
76 views
What's the purpose of the inductor in this microphone biasing schematic?
I'm just wondering what's the purpose of the inductor in this microphone biasing schematic?
Could it be that I have very low input signal from the microphone because of missing L1? Bias generator ...
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2answers
79 views
Johnson-Nyquist noise for a lossy inductor?
In searching the internet for thermal noise on an inductor and I'm not finding much on the basics for a real lossy inductor. I'm interested in thermal noise for a fixed inductor in a surface mount ...
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2answers
108 views
Using a capacitor instead of inductor in a switching regulator, and viceversa
Contextualizing more:
In a switching topology, and I am butchering it now, the inductor gets "charged", and eventually will keep an amount of energy "just enough" required for the load. This is ...
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1answer
51 views
Buck/Boost converter TPS63070RNMT is not working properly
I am working on a Buck/Boost converter design which is based on Buck/Boost converter TPS63070RNMT. Below is the schematic design. All the selected components are as per the Section 9 of the datasheet.
...
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1answer
50 views
Designing a circuit using an LT1073 DC-DC Converter
I'm currently designing a circuit to convert a 24V (±30%) to supply a 3,3V IC used to monitor currents. I need to use the LT1073 which has the following diagram.
The operations of the component and ...
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1answer
60 views
Questions about Inductive Kickback and what causes an inductor to discharge?
This is most likely a dumb question, just for some reason I have just forgotten the fundamentals about how charging and discharging work.
Essentially my question is for this simple circuit:
When the ...
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3answers
59 views
Under open-circuit conditions, does a transformer behave more like a resistor, capacitor, or inductor?
I have the below schematic showing the equivalent circuit of a transformer under open-circuit conditions. Will the transformer behave like a resistor, inductor, or capacitor? And will this behaviour ...
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2answers
141 views
What is the purpose of the choke in this circuit?
I'm looking into modding an old battery charger, but I want to understand exactly how it works before I start. What is the purpose of the choke in this circuit?
Some people at my work have suggested ...
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1answer
63 views
Science behind mutual inductance dot convention
I have gone through several links about the dot convention of mutual inductance, but nowhere could I find the reason why a dot is placed where it's placed. Is it to do with any direction of current ...
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0answers
73 views
Finding the voltage across an inductor in a RLC circuit
Well, we have the following circuit:
And I need to find the voltage at the node \$\text{Y}_1\$.
My Work:
The input voltage and current relation is given by:
$$\frac{10}{s}=i_{in}(s)\cdot\frac{1}{\...
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1answer
40 views
C=Q/U equivalence for inductor
In order to calculate the time it takes to charge a certain capacitor with value C at a given constant current of a value I to a voltage of value U, I can use:
$$ C = \frac{Q}{U} = \frac{I\Delta t}{U}...
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1answer
32 views
What is the change in voltage across an inductor, or change in current through a capacitor?
The formula for voltage on an inductor is stated as
v = L (inductance) x (di / dt)
and current for a capacitor is
i = C (capacitance) x (dv / dt)
But I don't understand what the (dv/dt) part of ...
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2answers
52 views
high voltage coil protection with epoxy resin [closed]
I have a high voltage cylinder coil with iron core. I want to protect it with epoxy resin. What is a good and easy way to do it for single use in a lab environment? What are the pitfalls?
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Simplified eqn for inductor charge for short timeframe?
In a worked solution my professor has given me it says:
I(load) = Io(1-e^(t/time constant))
and I(load) = Io * (t/time constant) (for a short time period)
I don't understand how the second line can ...
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1answer
39 views
Buck Converter - Closed Loop - Effect of decreasing inductance and increasing capacitance
Output voltage as a function of output current is plotted from oscilloscope data for a closed loop buck converter.
Switching frequency is kept the same in both the cases.
CASE 1 : Inductance = 2....
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1answer
45 views
What is the function of series inductors on the motor phases of a commercial brushless EC/BLDC motor controller?
While designing my own BLDC controller I got curious about how the big boys do it and opened up a commercially available one (Maxpos 50/5). Most things were quite straightforward, except a 11.3uH ...
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1answer
40 views
How to read markings on EMI/RFI filter
I am looking at a 3-pad SMD EMI filter chip (see photo) which is marked on the top with "222J". I am familiar with reading the markings on top of resistors and capacitors, but am not sure how to ...
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1answer
62 views
How to write inductor ODE equation properly?
I've drawn a following scheme, and now want to write ODE system for describing inner processes, in order to explore it:
simulate this circuit – Schematic created using CircuitLab
I wrote the ...
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2answers
91 views
How is it possible that an LC Oscillator create a sine wave?
I have a question, for example look at this circuit:
1)How is it possible if this circuit can oscillate, for example taking on the capacitor full charged, and the inductor full discharged, the ...
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2answers
86 views
Inductor through hole legs different length
Why would the legs on a radial through hole inductor be different lengths from eash other? There is no polarity to indicate like a LED or Electrolytic cap...
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0answers
71 views
Transfer of Energy from Initially charged capacitor to uncharged Capacitor
I have started to learn about LC circuits, Specifically, I am simulating a case where the initial conditions are where one large capacitor (100F) has previously been charged to 1.3V, considering the ...
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1answer
69 views
Limiting current draw from a power supply
I have a power supply that can supply around -60 kV DC and 10 mA. This power supply provides energy to a device known as a fusor. A fusor utilizes a low current and a high voltage to ionize a gas and ...
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1answer
91 views
Can a stepper motor flyback diode discharge a coil when connected in serial to the coil and opposite to the current?
On a circuit taken from this page http://www.opend.co.za/tutorials/steptut1.htm
The last circuit shows two diodes positioned in reverse polarity to the current.
It is supposed to protect against the ...
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2answers
99 views
What kind of magic is energizing the coils in this simple stepper motor driver?
Looking at this web page, i found a simple stepper motor driver circuit
https://www.electronicshub.org/stepper-motor-driver-circuit/
The problem is, i just can't understand how it can work when the ...
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0answers
56 views
Transformer/Inductor Bobbin Sizes
I have to design a 150 Ampere, 1.5 mH Inductor for a power supply project assigned to me, and off-the-shelf components are to be used. My instructor is insistent on using a transformer Bobbin to wind ...
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2answers
35 views
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2answers
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Transformer and Thevenin Theorem
Consider an ideal transformer connected to a real AC voltage source (with output resistance Rg).
Now consider to apply the Thevenin theorem between the output terminals of the secondary circuit. I ...
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1answer
85 views
Output Filter Components Breaking Class D Amplifier Chip
Hi I am designing a class D amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board:
I bought components of the same values given ...
