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

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17 views

SMPS 85-265 Vac to 32 Vdc doesn't work for a long time

I'm developing a SMPS and I'm having some problems with heating. Firstly here is all information about the SMPS: Input: 85-265Vac Output: 32Vdc - 48W Flyback design IC: UC3842 Inductor size: EE28 ...
2
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2answers
128 views

Core saturation detector-differentiator

I am building some project that requires me to measure the saturation corrent of some homemade inductors winded on scavaged ferrite cores, so I decided to try and create a circuit that will aid me in ...
0
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0answers
28 views

Mutually Coupled Inductors

Hello there im working on a project in which i'm making a wireless mobile charger. Im using two mutually inductors for transferring power wirelessly i want to transfer 14V (AC) from my primary coil to ...
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2answers
56 views

Why is there an inductor in this power supply circuit for SAM3X MCU?

I am working on a senior design project and am trying to embed an ATSAM3X8E (Here is the Application Sheet PDF) micro-controller into a system my team is designing. What is the pourpose of ...
1
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2answers
59 views

Calculating resistance and reactance of an coil (motor winding)

I want to find out the resistance and the reactance of an motor coil. I can measure the magnitude of the current through the coil using a DMM. For example, If the voltage across the coil is 230v ac ...
0
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1answer
32 views

Inductor Core Loss: Volt-uS vs. Irms vs. Switcher Frequency

For DC to DC application, I see these charts often for inductors, but I don't understand what they actually mean. What does this chart mean, and how does it relate Volt-uS, Irms, & Freq? Edit: ...
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0answers
27 views

How to measure the impedance of Induction motor windings

I want to know the easy method of measuring the impedance of induction motor windings (coils) in rectangular form. Say, Z=R+jXL; need to identify Z, R and XL as accurate as possible
2
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3answers
104 views

How does a transformer transmit power from the primary to the secondary?

I'm trying to get my head wrapped around transformer operation and in the process regretting the times I snoozed in my Electromagnetics class as a EE student back when I was a lad :) I'm looking for ...
0
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0answers
21 views

How to chose a right inductor for a matching circuit

I would like to chose an inductor to make a matching circuit. Operating frequency is 6.1 GHz. I am more concerned with self resonance frequency and Q of an inductor. An inductor with SRF > 7 GHz and ...
0
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30 views

a Half Rectified AC, filtered by an inductor in series

What does a Half Rectified AC, filtered by an inductor in series' Voltage will look like?? I think it would be still pretty much the same, or will it be much different than that?
5
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1answer
93 views

Toroidal inductors

I made some inductors with CF196T1305 ferrite cores ( http://www.cosmoferrites.com/Downloads/ProductSize/3defd392-c210-4f70-a6c6-70f5b60b1953_T1305%20_WS.pdf). According to the data sheet these ...
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1answer
52 views

Diy inductor saturation current

I have a boost converter that will convert 12V and 11A to around 20V and 6A. Since I didn't find any inductors (in my local stores) capable of such currents and frequencies and the correct inductance ...
2
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2answers
85 views

Would an inductor and a wire in parallel have an equivalent inductance of 0?

Since the equation is \$\frac{L_1L_2}{L_1+L_2}\$ and one of the wires has an inductance of zero , would the \$L_{eq} = 0\$?
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1answer
32 views

USB powered Switch Mode Li-ion Charger

I want to design a Switch Mode Li-ion charger which uses 5V as input and charges a single cell Li-ion cell. I am referring this AppNote On page 4 they have given the equation to find inductor value ...
0
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1answer
36 views

Inductor for boost converter circuit

I'm using an AAT1217 for the boost converter in my circuit. The reference circuit I'm using is: The datasheet suggests several inductors: It suggests using these fairly large inductors, the ones ...
0
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2answers
273 views

AC Power loss of inductor in a buck converter

I have a custom piece of equipment that gives a value for AC power loss (Pac) for an inductor plugged into an internal buck converter circuit. The custom equipment has an oscilloscope which is ...
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0answers
60 views

Trying to get a gain of -2

What capacitor will this circuit have a gain of -2 at 40 kHz? The op- amp has an open loop gain of at least 10000 at this frequency.
0
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1answer
32 views

Use Preformed inductor instead of coil for FM Transmitter

I want to build this transmitter: The inductor in the schematic says 0.1uh so I figured I could get some of these and use them instead of making my own like it describes in the picture. I would be ...
5
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3answers
125 views

Why does the MCP1650 datasheet give such a low value for the inductor in a boost converter?

I'm currently designing an SMPS around an MCP1650. In the datasheet (see page 4), the recommended value of inductor is 3.3uH. However, all the inductor size calculations I've come across (here and ...
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1answer
39 views

Stray Capacitance in my load waveform?

I have just taken this trace of my Loadwave form for PWM controlled halogen dimmer. I was wondering if anyone could identify the cause of the transients below or above zero volts for each polarity. ...
1
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1answer
34 views

Size of inductors in passive filters

I was reading about why we need active filters even when we have passive filters with us. I got to know that one of the main reasons for doing so, is that at lower frequencies the size of the inductor ...
1
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1answer
52 views

Measure inductor coil's resistance using multimeter

simulate this circuit – Schematic created using CircuitLab Above is the set-up of my simple experiment to determine the inductance of an inductor. The voltage across resistor R (5 ohms) ...
4
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2answers
368 views

Why do we rectify then invert current in induction heaters?

I was trying to build a simple zone refining prototype, so I thought of How to simplifying induction heater for zone refining? I throughly read What does a beginner need to know to build an inductive ...
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2answers
34 views

Calculate rotor slip without knowing synchronous speed

I am given the rated values of a squirrel cage induction motor: A 300hp, 2300V, 3‐phase, 60Hz squirrel‐cage induction motor turns at a full‐load speed of 590r/min. What is the approximate value ...
2
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4answers
176 views

How does inductor store energy?

I know that the capacitors store energy by accumulating charges at their plates, similarly people say that inductor stores energy in magnetic field. I cannot understand this statement. I can't figure ...
2
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1answer
42 views

Buck Converter Multiple inductors

I'm looking at a height constrained application, that's making it difficult to find the power inductors I need. What's wrong with say using 4 inductors in parallel to get more current? I know the ...
3
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4answers
102 views

Why would anyone use an inductor on a mux?

I read a schematic where it has a Z80 CPU tied to a 78LS138. The CPU's WR line is tied to ...
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1answer
57 views

Newbie RLC Question

Hoping someone can help. I have been studying RLC series circuits. The first set of questions gave the value of resistor, inductor and capacitor, which were calculated as follows: To calculate ...
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1answer
23 views

How is quality factor affected when combining inductors?

Lets say I have an inductor, L1 = 22 nH, with a quality factor (Q) of 50. I need an inductor of 44 nH, so I put two L1s in series. Will the Q of "the combined inductor" be 50? What if I want half ...
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2answers
40 views

Does gauge size of a signal wire has an effect to its susseptability to electromagnetic interference?

Let's say you have the option to use a lower gauge wire size (i.e. thicker wire) for a signal wire that happens to be run along power wires. Will it pick up more electromagnetic interference than ...
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1answer
47 views

Hi, in following circuit how do i calculate value of inductors L1, L2, L3, L4. (Design equations for inductors)

What will be the design equation to calculate values of inductors L1, L2, L3, L4.
2
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1answer
94 views

How to correctly use a LC meter/bridge

I have a LC meter at hand that I'd like to use it to measure the inductance (dominated by L1) of a circuit branch like this : simulate this circuit – Schematic created using CircuitLab ...
0
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1answer
61 views

What is the purpose of an inductor on an incoming AC line?

I am trying to build the following schematic. It is a AC/DC converter from Cui link I do not understand the function of L2. What is its purpose? I am having a ...
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1answer
95 views

Can I measure inductor current by adding a secondary winding?

I have a buck converter and I want to add a current loop to it. I don't want to use a hall-effect sensor or something expensive like that. I think it is not practical to use a sensing resistor since ...
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1answer
108 views

Why inductors can not be integrated into IC? [duplicate]

If passive components like resistor and capacitor can be integrated into an IC, why not inductor?
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1answer
77 views

Wind high impedance transformer at home

Suppose I need to make transformer at home, but I am unable to wind 100k turns obviously, then can I just connect a resistor in series with a winding to achieve desired impedance? Will it have serious ...
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0answers
118 views

Why output current shoots up by 10x

Here is my hand cranked generator for charging a high voltage capacitor. How the system is designed to work is shown in the following image: It is designed to charge the 10 mF capacitor to upto 50 V ...
0
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1answer
88 views

How to design mutual inductor in proteus for wireless charging?

While designing the wireless charger, i've designed the circuitry in proteus. And it begins with the use of the dc voltage, then the oscillator and finally the transmitter circuitry and the receiver ...
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2answers
181 views

Reduction of DC motor noise

I am designing a circuit with a DC motor (http://www.jaycar.com.au/products_uploaded/YG2732.pdf) and some other stuff including a MCU and a LASER, all driven from a single 12V source and am concerned ...
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0answers
55 views

Which current ripple equation should I use? (Boost converter)

I am designing a boost converter for a microgrid as an university project. It is supposed to interface a 2.4kW 120V solar array (using MPPT) with a 380V DC bus. There will be other sources and loads ...
2
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3answers
141 views

Current through Inductor Problem

I am working on my Circuits Analysis class and I came across an interesting problem. I will put it below along with my work and then explain the problem. The current through the \$L=100\,mH\$ ...
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2answers
92 views

Calculating inductor voltage in a second order linear circuit

I was trying to solve the following second order linear circuit: I managed to calculate all parameters but one: the Voltage of the Inductor at t=0, that is necessary to define the B parameter of ...
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1answer
63 views

4 pin inductor for buck convertor

I am designing a buck converter. I have found an inductor to use for it but it consists of 4 pins. Will I not need only 2 pins? The inductor is: WURTH ELEKTRONIK 7446622002 CHOKE, COMMON MODE, ...
3
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2answers
347 views

Missed ordering 10uH inductors for ICs, do I need them?

Well dumb me apparently forgot to order these 10μH inductors. I'm assuming the L and the C and the R are used for band-pass-filtering/stabilizing the input voltages. I really don't want to make an ...
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1answer
64 views

external power treatment in the powered board

I'm working with an audio board (company project) that is powered by a external 9V power supply. Actually an ordinary AC adapter, like this one: http://www.sweetwater.com/store/detail/MAud9v500. The ...
0
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0answers
81 views

How does this single-ended to balanced circuit work?

This comes from the sparkfun jamboree bluetooth audio board schematics (https://cdn.sparkfun.com/datasheets/Wireless/Bluetooth/Purpletooth_Jamboree1.pdf) How exactly does this work? With S7 in ...
0
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1answer
80 views

How do I pick an inductor(s?) for an LC filter on a power rail?

I'm using a TI SN6501 transformer driver to provide an isolated power supply for a project I'm working on. However, it is imperative that the output power rail be as clean and noiseless as possible, ...
0
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1answer
69 views

step response of a circuit having an inductor loop

What is the step response of \$I_1(t)\$ in the following circuit? (I mean if we apply step as input I what will be the I1? I simply used Laplace transform and calculated the step response, but it was ...
6
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1answer
481 views

Boost SMPS getting very hot. Why?

I tried to experiment with boost SMPS with multiple supply rails and I almost burned myself when touching parts when running. Here is the circuit and the part getting hot: simulate this ...
4
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2answers
193 views

Is there a difference between a choke, a reactor, and an inductor?

I've seen all three of these terms used interchangeably. But once when I did so, I was told I was using one of the terms incorrectly. Are these terms, in fact, equivalent? Or are there differences ...