Questions tagged [inductor]

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

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1 vote
4 answers
2k views

Can the coil in a magnetic field be replaced by a copper mesh?

From theory, I remember that EMF induced is a function of the rate of change of magnetic flux. A generator is typically a changing magnetic field applied to a bunch of diamagnetic wires wound closely ...
4 votes
6 answers
6k views

What is the largest inductance value ever attained (in Henries)?

For example, are there inductors with values in terms of kH or even MH? 1 H inductors are not all that easy to find.
0 votes
2 answers
51 views

Inductor and transformer with open magnetic core

I have some troubles to understand the principle of: 1-> open core inductor 2-> open core transformer Let us talk about open core inductor as the one above: If we think about it as an ...
1 vote
3 answers
108 views

16A AC rated switch contacts welding with 36V battery and capacitor. Can a series inductor fix this?

I have an old Black&Decker battery powered mower that uses a 36 volt SLA battery pack. The original motor failed catastrophically and I now have a 24 VDC motor adapted to fit. I added a PWM buck ...
0 votes
1 answer
34 views

Attach thermocouple to a PFC inductor

The inductor I am talking about is simply a toroid. I am attaching a thermocouple junction to this component with help from thermal paste and aluminum tape. Anything I should be careful about in this ...
0 votes
2 answers
1k views

Selecting a MOSFET to drive a coil with a square wave

I need help with finding an alternative to the IRF1310 in the circuit shown. The circuit is going to be controlled with a microcontroller with 3.3 V logic. The simulation of the circuit in LTspice ...
3 votes
2 answers
513 views

Sizing the DC/DC inductor for only momentary high currents

My DC/DC setup is going to power a GSM modem. The behavior of these modems is that they typically consume only a few tens of milliamps, but when transmitting they are drawing 2A for microseconds. On ...
0 votes
1 answer
105 views

Why is an inductor rather than a capacitor used to smooth switch mode regulators

I understand (at least at a high level) how to use both capacitors and inductors to reduce noise but I don't understand the advantages/disadvantages of each approach or why one is chosen over the ...
1 vote
3 answers
89 views

Is connecting an inductor in series with capacitor bank a good idea to reduce inrush current?

I need to connect capacitor bank to a 240VAC supply. I understand at the instance of switching on the capacitor bank there will be an inrush current since capacitor act like a short to ground. I'm ...
2 votes
1 answer
67 views

Equivalent model of a real inductor -2

Is this possible to explain what is happenning on this inductor? I observed this phenomenon on an inductor. I simulate the phenomenon by adding a parallel resistor to the inductor, but I do not ...
-1 votes
0 answers
30 views

How to select frequency for Ferrite bead? [closed]

As per my knowledge, we use ferrite bead for removing high frequency noise. How do we know the noise frequency to be removed in our board. Eg: My boards maximum frequency is 100MHz, which frequency ...
0 votes
2 answers
39 views

Would an inductor work differently under a different dielectric environment?

I am talking about these common rounded inductors with a metal core that you would find on PCBs. Would the operation be different in, say, mineral oil vs. air? These are two different dielectric ...
1 vote
1 answer
2k views

How to convert Inductor to series transmission line?

My objective is to understand the travelling wave amplifiers, but I am stuck on how to realize inductors in transmission lines. But, I am basically stuck on how to convert a series inductor to a ...
1 vote
2 answers
62 views

How to properly start an induction motor using a variable frequency drive? [closed]

I've seen on several websites that a variable frequency drive (VFD) can be used as a starter for induction motors, but didn't find any details calculation on what should be the starting frequency. In ...
0 votes
3 answers
70 views

How much power passes through the shunt component of a high-pass Pi or Tee filter?

I would like to send ~100W through an RF filter. Can you estimate the current passing through the shunt component without a circuit simulation assuming a reasonably high S21 value? MLCC's are cheap, ...
2 votes
2 answers
79 views

Variance in winding a toroid

I'm building a filter from a kit with some given (microscopic pre-soldered SMT) capacitors and 2 toroids. It looks like the notch frequency is a bit too low with 10 wire turns around a T37-2 iron ...
0 votes
0 answers
169 views

Identify and source replacement common-mode noise choke

I have a circuit where the marked inductor common-mode noise choke in the image below is damaged. I am having massive trouble sourcing this inductor common-mode noise choke anywhere. No results on ...
0 votes
1 answer
37 views

Inductor and Capacitor 3-digit exponent value codes: is there a standard?

I've seen the standard NNX exponential value code where NN are the significant digits and X ...
2 votes
1 answer
113 views

What is going on regarding power toroid shielding? (some shielded, some unshielded, no apparent difference)

In this Digikey search for 47uH toroid inductors, the shielding column shows that some are considered shielded, and others are considered unshielded. And even from the same manufacturer (Bourns). A ...
0 votes
1 answer
56 views

LC circuit with back to back diodes [closed]

I know how an LC circuit works, but in this circuit there are 2 diodes and I am not able to intuitively get the waveforms of current and voltage across the capacitor. Could you please help understand ...
2 votes
2 answers
67 views

LC meter fails to measure inductance of a transformer primary with the presence of opened secondary

I'm making some custom low signal 1:50 step up transformer, and I noticed something interesting. My LC meter displays correct primary inductance when no secondary is present on a core. With the ...
0 votes
1 answer
43 views

determining the Bmax for inductor design

at this moment of this youtube video following graph is presented for selecting the proper maximum flux density. the considered proper amount of core loss is 100mW/cm^3. is this a general amount for ...
1 vote
1 answer
54 views

Is it okay to use a polarized capacitor at low enough frequency?

I have solenoids with values between 0.5-10 mH. In order to make an LC resonant circuit at 1 kHz, I need capacitors in the value of anywhere between 2 to 50 microfarads. The problem is that I can't ...
2 votes
1 answer
175 views

What are the differences between these ferrite cores?

The ER, EC, and ETD ferrite cores are presented in a datasheet but visually I don't see any difference between them. The search results also say the same thing.
2 votes
0 answers
37 views

Safe operating temperature for power inductor

I'm currently developing a DC-DC buck converter that has a rated output of 10A/60V. When the average output current is 7.5 amps, my main inductor heats up to about 40°C (room temp's about 25°C). I ...
2 votes
1 answer
61 views

implementing dot convention

in the following topology, a boost inductor with secondary winding is operated in which the windings are in opposite directions. Implementing this structure, in reality, made me confused. Based on my ...
1 vote
1 answer
69 views

Trouble finding LDM for EMI filter

I am trying to use this DC-DC converter and I am having trouble recreating the recommended circuit as I'm not entirely sure what an LDM is or where to find one: From basic google searches it looks ...
0 votes
1 answer
39 views

Difference between air gap calculation in an inductor with respect to practical measurement

I've designed a 75 μH inductor with EI3329s. Winding is 23 turns of two parallel 1 mm wire. From calculations, rhe air gap must be 1.1 mm in the center post of the core. I've neglected the reluctance ...
1 vote
1 answer
1k views

Power input surge protection

I've seen power protection that uses: MOV (metal-oxide varistor) Inductor TVS diode Application Note: Transient Voltage Suppressors (TVS Diode) Applications Overview I didn't see any design guide ...
7 votes
1 answer
112 views

After being open for long time, the switch in circuit closes at \$t=0\$. Determine \$I_1(t)\$ for \$t>0\$, Steady State Current and Initial Current

I am seeking guidance on this Assignment [Homework] Problem regarding RL circuits because me and my study group are getting two different answers and we don't know why. Question : After being open ...
27 votes
10 answers
36k views

How does an inductor store energy?

I know that the capacitors store energy by accumulating charges at their plates, similarly people say that an inductor stores energy in its magnetic field. I cannot understand this statement. I can't ...
-2 votes
2 answers
104 views

What is this component in a power supply?

We bought a Cisco 6500 series 6 kW PSU and took it apart. This is a module connected immediately to the inputs of the power supply unit. Does anyone know what it does?
2 votes
5 answers
910 views

Turning an inductor into transformer and leaving the secondary open

Let's say I have an inductor of whatever type (ferrite core, air core). This inductor is a part of a circuit, an oscillator for example. Now I wind some magnet wire around it and I leave the ends ...
0 votes
8 answers
231 views

Is there a voltage across an ideal inductor?

I have been learning about LC and LCR circuits. My question is about inductors themselves, more specifically ideal inductors with zero resistance. If I disconnect an ideal inductor from a DC supply, ...
0 votes
1 answer
74 views

Core, Inductor, Inductance [duplicate]

Does anyone know what the Al value given in the datasheets means when choosing cores? There is no explanation of the subject other than the formula anywhere. And why is (n^2) / equal to L? Why do we ...
6 votes
1 answer
180 views

Non linear inductor in LTspice

I am trying to construct a non linear inductor in LTspice and have a question regarding the two plots provided below. In the first image current is swept from -30A to 30A in steps. The result yields ...
2 votes
2 answers
111 views

Ideal Transformer Currents Relationship

I'm currently quite confused with the relationship of the currents for an ideal transformer when it overlaps with multiple mesh currents. It was defined that for: $$\frac{\bf I_2}{\bf I_1}=\frac{1}{n}...
0 votes
3 answers
60 views

Inductance depends on the number of turns in a solenoid. Is this the case with reluctance as well?

The total flux (\$\Phi\$) through an solenoidal inductor of length \$l\$ and \$N\$ turns is proportional to the current through the inductor and the inductance \$L\$ of the inductor according to $$\...
1 vote
1 answer
64 views

Buck converter coil selection (Coilcraft vs Bourns)

I am using the SCT2331 (a clone of the Diodes AP63200, with 400KHz switching frequency instead of 500KHz). The design works with an inductor from Coilcraft (LPS3314-103), but when I try a different, ...
3 votes
2 answers
292 views

Interview Question

This Circuit was given. I know every component of this circuit individually, I know feedback and gain margin and transconductance amplifier. But the problem is how to start? first, I was thinking to ...
0 votes
1 answer
174 views

How to Choose Proper Components for Class D Amplifier Circuit

Hi I am designing a class B amplifier PCB using the TPA3122D2 amplifier chip. I am planning to base my circuit on the schematic from the evaluation board (see below). I have tried building out this ...
2 votes
0 answers
50 views

Current Direction and Voltage Polarity in Capacitor/Inductor Circuits

I believe that this question may be simple for those with a little more experience, but it is still puzzling me. Studying capacitance/inductance, I understand that the capacitor in the DC case behaves ...
0 votes
0 answers
53 views

I want to Implement this active inductor design in my circuit

I'm trying to use the active inductor in here instead of the inductor in my class e power amplifier, however I'm having difficulties in getting the required values for the parameters in here Cds, Cgs, ...
2 votes
1 answer
495 views

Can this 1000W ballast be wired for 240V and plugged to 120V to run a 400W MH Lamp?

I've a 1000W MH ballast. Is it okay to use the wiring for 240V the ballast and use it on 120V? Like does it reduce the ballast to 500W? I've attached a video for better understanding of how the bulb ...
0 votes
1 answer
72 views

How to reduce or eliminate inductor sound noise in a buck SMPS?

I use this circuit as my device power supply: Here I have R2=5.6K as my SMPS load but at this load I have about 10KHz switching frequency which leads to an annoying audible noise, probably from L1 (...
0 votes
0 answers
48 views

The switch pin of boost converter seems to pull down the input voltage

I'm designing a circuit to convert the 3.7-4V Li-ion battery output to a steady 5V DC power supply. The boost-converter I chose is a synchronous boost converter SGM6611C with a fixed switching ...
0 votes
0 answers
51 views

Inductor calcualtions to limit inrush and avoid oscillations in power line

I want to design a circuit that is able to supply my load with 12V at 2.3A for around 10ms when the power is switched off. The capacitor size will therefore be 23000 uF, assuming a 1V sag. Applying ...
2 votes
4 answers
243 views

Which components cause low humm and medium to high pitched buzz in this computer monitor? [closed]

I recently bought a ten year old 10-bit color fidelity computer monitor (NEC PA301W) that has brilliant display quality but to my sensitive ears has an audible/annoying low pitched humm noise along ...
2 votes
2 answers
120 views

DC-DC booster functionality

I am working on a DC-DC booster. I have already built it, boosting 1.7 V to almost 18 V. I am using an IRF540N as my transistor, an inductor, a diode, and two capacitors. I was reading about how the ...
1 vote
2 answers
129 views

Can I use common mode power line choke as 1:1 transformer in isolated buck-boost switched mode power supply at 20 - 100 kHz?

I'm planning to build a multi-output power supply that allows output voltages between 0 - 30 V and currents below 5 A. The idea is that I will purchase a number of 30V 5.3A power bricks (unknown if ...

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