Questions tagged [ferrite]
Anything related to the properties and applications of ferrites. Ferrites are ferrimagnetic compounds widely used in the manufacturing of electrical devices exploiting magnetic fields like inductors and transformers.
177 questions
2
votes
4
answers
209
views
Transformer core design without number of turns available
I have to design a transformer with defined parameters such as my primary and secondary voltage, rated power of the transformer, the flux density and the lowest frequency \$f\$, are there other ...
- 61
31
votes
4
answers
3k
views
Why are ferrite cores on cables less common in consumer electronics?
I remember in the early 2000s, ferrite cores seemed to be all over. They were on the Playstation conttoller's cable, on USB cables, TVs would come with clip-on ferrite to put on your cables, it seemed ...
- 819
2
votes
1
answer
70
views
PWM controlled load: EMI best practices
I am driving passive LEDs (24 V, 1 A) through two transistors activated by a ~10 kHz PWM signal. The power goes through a shielded cable from the PCB to the LED module. My wider setup should be CE-...
- 307
3
votes
2
answers
513
views
Bead vs choke characteristics
I seem to have confused the concepts of beads and chokes.
Bead: Operates as an R due to LC resonance, causing heat loss and acting as a filter (hysteresis loss/eddy current loss).
Choke: Generates ...
- 49
1
vote
3
answers
250
views
ferrite core in common mode configuration on AC mains - does ground wire also going through the core have any effect?
I've had some electrical issues in my home over the last few years from nearby lightning strikes. I first focused on voltage protection devices (SPDs), but this didn't really help at all. Then I ...
- 185
4
votes
4
answers
728
views
Limitations of ferrite cores at low frequencies
Might sound like a silly question but I was reading on transformers:
What causes ferrite cores to be less suitable for transforming voltages at low frequencies (say 50 Hz) compared to iron cores? And ...
- 61
0
votes
1
answer
94
views
Ferrite core calculation formula for buck circuit
I am calculating inductors for buck circuits, I found this article that is what I want, but is the formula for calculating Emin and Ecore appropriate, I asked ChatGPT and it said Ecore is wrong, I use ...
- 49
-2
votes
1
answer
96
views
How much inductance and turns would I need for a LC circuit for mw band?
I been trying to make a LC circuit for mw band or sw band for now I only have a 3-18 pF trimmer capacitor and this small ferrite rod.
What gauge of wire and how many turns would I need for LC circuit ...
- 23
5
votes
3
answers
533
views
Can I change a ferrite core to a slightly larger one without problems?
I am installing some equipment and the manufacturer instructs to loop the communications wire several times on a ferrite core, problem is we are using a slightly different communications wire where ...
- 2,134
2
votes
1
answer
205
views
How should I sand down the inductor core to achieve the desired air gap?
I designed an inductor using a PQ2625 ferrite core. I don’t want the core to go into saturation during operation, so I determined a minimum required number of turns. However, this number of turns is ...
- 1,213
4
votes
1
answer
409
views
How effective are my old TV baluns?
I have some old 300 ohm to 75 ohm baluns, probably from the 1970s:
What is the expected cutoff frequency (-3dB loss) for old (1970s)
and modern (2020s) baluns of this form? What loss is expected for
...
- 916
1
vote
1
answer
162
views
Coax through ferrite in RF amplifier
What is the purpose of these pieces of coax woven through a ferrite bead? In this case I am talking specifically for use within RF-amplifiers. I have seen them before, both before and after power ...
- 171
2
votes
1
answer
87
views
Capacitive behavior of a CM choke
I have been measuring a CM choke intended to be installed on DC busbars and I am seeing something that I cannot quite understand. I expected a CM choke to be inductive in this range, but just above ...
- 21
0
votes
1
answer
305
views
Ferrite Core Losses calculate
I want to calculate the losses of a ferrite core. I don't want to rely on TDK limited charts and numbers.
Here Magnetics INC has a calculation with constant numbers which is very useful
I am looking ...
2
votes
0
answers
94
views
Does the spacing of ferrite clamps affect their performance?
During an EMC seminar (by Würth, I believe) some years ago, I remember learning that if you are going to put multiple ferrite clamps after each other on a cable, they should be separated by some ...
- 5,820