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.
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Ferrite cable core selection best practices for USB 2.0 Full Speed
From signal integrity and best possible EMI suppression perspective should ferrite cable core match the characteristic differential impedance of 90ohms @ 12MHz (for USB 2.0 Full Speed) in order to ...
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How can I calculate the size of a power ferrite core transformer?
I'm working on an amplifier that has to drive a load with 200 W at 100 kHz.
I have a tested architecture based on wideband ferrite transformers but for 50 W and higher frequency.
My goal is to ...
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Value of a ferrite bead in PHYs
I have seen a couple of ethernet PHYs whose manufacturer datasheet recommends placing a ferrite bead on the power supply input of the PHY device whose value is, "Generally, a 100-220Ω (at 100 MHz)...
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What does float long and float short mean with respect to ferrite core transformer windings? [closed]
I have winding instructions for winding a EE13-06 ferrite core transformer, for secondary it's written 0.23 mm TIW,
no. of wire = 1,
no. of turns = 66,
start = float short,
finish = float long.
What ...
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AM Receiver Antenna Coil
In almost all the radio receivers whether FM or AM, custom wire-wound coils are used that are wrapped on a ferrite core usually (not always) of 100 mm x 10 mm dimensions. Is it possible to use fixed ...
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Push-pull converter: ferrite core transformer dropping voltage [closed]
I am creating a 100 W, 12 V to 120 VAC @50hz inverter. I have implemented a push-pull converter to obtain a 200 VDC link for the H-bridge of the inverter.
I am having problems with the push-pull ...
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Effects of ferrite isolator on waveform
I have recently measured the standing wave signal from a waveguide. I notice that as the frequency is lowered the signal tends towards a sawtooth wave.
**
My guess for why this happens is that the EM ...
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High PWM frequency step-up transformer using PWM signal generator and MOSFETs
I am trying to build a high frequency step-up transformer for PWM signals.
The signal that I want to step-up with transformer has to be modifiable with the 2 pulse signal generators.
So Freq 1 and ...
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Should I use a ferrite core on my AC adapter? [closed]
I'm using an AC adapter for a port replicator (it meets the voltage and provides more amps) which doesn't have the ferrite core the original one had. Should I put one of these ferrite cores on it or ...
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USB 2.0 VBUS Filter
I am reading an old (2013) FTDI application note AN_146 about hardware design for USB 2.0. On the subject of VBUS filtering, it says this:
2.4.4 Ferrite bead use and placement – USB peripheral ...
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Value of ferrite bead while connection chassis ground (from RJ-45 connector) to digital ground
I am connecting the chassis ground of the RJ-45 connector to the board's digital ground.
In that case, I saw an Evaluation board design that uses a 1000pF 2kV cap to connect both the grounds.
My ...
user220456
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How to increase output current while maintaining low voltage through a ferrite transformer?
I'm building a circuit to generate a 4600 Hz square wave signal and couple that signal to household 120 V, 60 Hz AC mains. This remotely turns on and off a receiver device plugged into an outlet in ...
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MC34063A ferrite bead
The converter works in the inverter mode and gives an output of -5V.
I present a diagram based on the documentation. I want to eliminate the output voltage ripple with a ferrite bead. Unfortunately, I ...
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How to measure the leakage inductance of LLC Split bobbin transformer with two auxiliary windings
Let’s say I am having ETD core and split bobbin for LLC Design
I have 4 windings in that transformer
primary
secondary
primary aux
secondary aux
I am winding the primary and primary aux windings in ...
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Confused about which impedence value to pick for ferrite bead
Per the vendor's recommendation, I need to add a ferrite bead to the 2.5 V power supply. An evaluation board used the BLM31PG601SN1. It has an impedance of 600 Ω at 100 MHz and a rated current of 1500 ...
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Is this a good idea to separate Grounds via ferrite beads?
is this a good idea to separate the GND of different parts of a circuit trough Ferrite Beads?
I have different parts in my board:
1- Microcontroller unit
2- Digital Inputs
3- Digital Outputs
4- Analog ...
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Ferrite bead selection
In some pages online, it is mentioned that "whenever possible, the targeted noise frequencies should fall within the bead’s “resistive band,” meaning the range of frequencies in which the ...
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Issues Choosing Flyback Transformer Specs & General Direction Help
I'm working on trying to figure out how to wind transformers myself and picking values etc. I currently have PQ26/25 Bobbins with PC95PQ26/25Z-12 ferrite cores (N95).
I have some smaller E cores ...
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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 ...
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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.
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Finding DC saturation behavior of clamp ferrites
While some chip ferrite datasheets specify maximum current and DC saturation behavior, it seems like many clamp ferrites omit both maximum current specification (which arguably is less critical) but ...
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Generating and measuring a sine wave with THD below -80dB
For an experiment I need to generate a sine wave which has a THD below -80dB. I would like to do that using a band-pass filter connected to a function generator because the output of the function ...
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Flashlight dismantle: why is a small cylinder of ferrite used?
After dismanteling a Petzl flashlight, I found a small cylinder of ferrite.
Why is it used? For what?
The flashlight used 3 AAA batteries so the ferrite bead doesn't seem to be used for reducing high-...
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Which frequency should be considered for inductor design in this FOT (fixed on time) PFC?
The PFC topology, I'm trying to design, works in transition mode, and switching frequency varies from 37 kHz to about 600 kHz according to the phase. The current flow through the inductor is as ...
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Will the current needed for core saturation (transformer) increase with applied voltage?
I was going through one of the research papers based on self-excited push-pull converters.
The line below is taken from the paper:
the current needed for core saturation rapidly increases with ...
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Ferrite rod (loopstick) antenna directivity
In a video about ferrite rod antennas it was stated that the antenna is most sensitive to the direction perpendicular to the axis of the rod, and it is insensitive along the axis. These are shown ...
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Why doesn't magnetic power transfer use ferromagnetic cores in the coils?
One well-known fact is that putting a ferromagnetic material in an inductor will increase the magnetic flux and thus the inductance value.
Wireless power transfer (WPT) happens through the magnetic ...
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Ferrite on USB VBUS line for charging port
On USB host port (and usually on device ports, too) the VBUS line is filtered with a ferrite (Intel EMI Design Guidelines recommends a 500mA part, for example), and that is obviously fine for standard ...
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Burned component on GIGABYTE RTX 2080 GAMING OC 8G
I have purchased an RTX 2080 which contains a scorched component. I have carefully removed it with a heat station. The card is not short and it works, but it is seen with artifacts.
As I found on the ...
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Which ferrite materials are used in GHz transformers?
Ferrite materials are commonly used for transformers for kHz and low MHz frequencies. Some vendors of RF products do however provide small transformers using small binocular cores (it looks like ...
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Current Density: Whether to calculate or use thumb rule in designing the ferrite core transformer
I am referring the book Transformer and Inductor Design Handbook[4E] by Colonel Wm.T.McLyman.In which he has emphasised to calculate the current density, rather than using the thumb rule value of 3-6 ...
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Split core vs. ring ferrite
I have an Arduino clone with L298P motor driver, which drives a linear actuator with a brushed DC motor and a built-in end of stroke mechanical switches and diodes. Motor runs at about 12V/2A DC, on/...
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GDT Core Selection for an MF Switching Action
I am designing an MF (approx. 1.5 MHz) MOSFET driver for an inverter circuit. I’d searched numerous driving strategies (according to the circuit’s needs like high frequency operation, drive-input ...
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Controlling motor EMI - more ferrite turns or shorter cables?
In wiring up a small robot, powered by two BLDC motors (of the "hoverboard" variety), I was going to shorten the leads a bit, and wrap them one turn around a soft-core ferrite for EMI ...
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What kind of inductor to choose?
Which kind of inductor should I choose if value is the same?
rolled over a ferrite
rolled over a plastic
rolled in air
rolled in a package looking like a resistor
Is it related to specific roles?
...
user201301
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Possible Contradiction in N87 ferrite material μa vs B graph
Why does this graph description (of N87 material) states ^B =< 0.25mT (which is peak flux density), even though horizontal axis goes up to 0.40T?
Is the horizontal axis in tesla peak-to-peak? Is it ...
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Ferrite core in electromagnets
I have a small project based around designing a small home-made DC actuator using a small DC electromagnet.
My final goal is to generate the strongest magnetic field possible with the minimum amount ...
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Should I place ferrite barrel/ring on my Nokia 5110 module data lines?
I have Nokia 5110 LCD module from AliExpress. My motherboard is ruled by ATmega64A and control pins for LCD are grouped together as pin header (male, 8 pins in total). The module itself is placed on ...
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Magnetic circuit and material magnetization
We have a high power magnet (SmCo, 1T) whose field is being conducted through EN24T steel to an airgap where we perform measurements.
The problem is that there appears to be a creeping change in field ...
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How can I noise decouple an FPGA with multiple VCC/VCCIO/VCCA pins?
Currently I am working on a small project using a Max10 FPGA from Intel.
I know about decoupling IC using a capacitor in parallel and a ferrite in series. This works for a small amount of VCC pins. ...
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Is the necessity of the ferrite core on a PS2 controller cable a function of the length of the cable?
I'm connecting a wired PS2 controller to an ESP32.
The controllers come with 2 meter cables that have ferrite cores at their connector end.
I will be shortening to 5cm and soldering to a 5cm ribbon ...
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can somebody explain this sentence in better words?
what is the meaning of "reproducible Al values over time" and why should we need it to be reproducible over time???
and what is "production spread"?
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How to characterize a wideband RF ferrite transformer
Transformer models incorporating intrinsic and parasitic elements are well known:
The mutual and leakage inductances are calculated from measurements of the primary and secondary winding inductances ...
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Where to get the core for an electromagnet?
I understand that using a soft iron core or a ferrite core for an electromagnet increases the strength compared to an air-core. I'm going to be using DC current and want the core to be 5-8mm in ...
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Multiple windings on single ferrite ring vs multiple ferrite rings
My question is does putting cables through multiple identical ferrite rings the same as winding them multiple times on a single ferrite ring?
I have my current setup as follows with multiple ferrite ...
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Can a ferrite bead accidentally rectify RF?
If the ferrite is designed to filter out in the lower region, up to 100 MHz, and the pass-band signal is even way lower, 60Hz, I'm thinking that the ferrite is constantly saturated along with the 60Hz ...
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Difference between ferrite pipe core and full ferrite core?
Disclaimer: I’m computer scientist
It is possible to buy ferrite pipe core coils and full ferrite core coils. The seller sell them for audio applications.
I’m considering using the coil to measure a ...
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Short circuited ferrite bead on PCB
I'm analyzing a circuit (USB game console.)
Three identical ferrite beads (805 or 603 package) are used in the circuit.
It was working but I tried something on circuit. Now it is not working.
I ...
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Loopstick (ferrite rod) antenna circuit model
A ferrite rod antenna circuit equivalent is usually given as so:
The numbers are made up, I didn't calculate the exact C you need to have to make it resonate at 1 MHz.
Here's a slightly more ...
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EMC 30-50 MHz emssions
I was trying to pass EMC tests for my 48V 5A BLDC driver and failed in 30-50 MHz range. I think I found the problem in my drive circuit, but I have a few questions that got me thinking, maybe someone ...
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