703 Threads found on edaboard.com: Ferrite
I have RF amplifier 15MHz , working from DC+50V to 50ohm Load.
N-MOSFET transistor have in drain RF choke.
Choke is toroids OD 24mm Ht 7mm (any as T94) painted on White, 11 turn , I measute L=12.4uH
Question is how type material is used?
I have yet found
RF, Microwave, Antennas and Optics :: 04-01-2017 14:12 :: berger.h :: Replies: 1 :: Views: 428
you need to get datasheet of the ferrite........few softwares will know what ferrite you they wont be able to assess your core losses.
2....dont overheat core with core loss
3....use enough strands to avoid skin effect problems
4....Proximity mindful of it
Power Electronics :: 02-26-2017 18:56 :: treez :: Replies: 2 :: Views: 425
I am winding a ferrite core inductor . To have an airgap of around 0.8 mm, I put a piece of paper between the centre leg of 2 E cores. (Core used is EE19/8/5) Is it a feasible method to have the air-gap?
How to join / glue ferrite core halves for winding the ferrite core inductor / transformer??
Which solution or paste is used for (...)
Analog Circuit Design :: 02-22-2017 03:08 :: abhishek.2138 :: Replies: 11 :: Views: 766
Basically yes, they are an epoxy coated combination of capacitor and ferrite beads (inductors) for supressing RF interference. To DC they usually appear as a short circuit. In the photo I would guess they block interference entering or leaving the board and the red discs are to absorb excess voltage spikes.
Check with Murata, they are one of the
Elementary Electronic Questions :: 02-22-2017 09:13 :: betwixt :: Replies: 6 :: Views: 478
GWDBSUCCESS i have posted an LTsice simulation of an offline flyback that uses your transformer. Just convert from.txt to .asc, then open in ltspice, then hit running man icon.
Also posted is excel design doc.
The datasheet you attached does not give the ferrite type so you cannot calcuate the core you will have to do thermal measurem
Power Electronics :: 02-17-2017 23:49 :: treez :: Replies: 5 :: Views: 614
thats a switching mode power supply circuit and I guess its a fly-back type (I see pc817 optocoupler).
the transformer is ferrite core switching transformer with two output winding
the transformer is specially designed for that circuit
you can find design information in switcher IC datasheet or application notes
Power Electronics :: 02-08-2017 06:02 :: hamidmoallemi :: Replies: 1 :: Views: 390
This is a components of Micro Wave Oven see the connection diagram
Next pictures are ferrite core filter, It is a common mode filter (feed through) for high frequency filtering application.
Service Manuals, Requests, Repair Tips :: 01-31-2017 11:00 :: smijesh :: Replies: 4 :: Views: 646
When I wrap the transformer for the spec 24v to 400v if I actually vary the pot in the circuit to change frequency won't that change the voltage also, I'm not sure what will happen at such high frequencies if it would damage the transformer or a low enough frequency won't damage a ferrite core like for example 1khz, what if that's the minimu
Power Electronics :: 01-27-2017 17:36 :: FvM :: Replies: 54 :: Views: 4145
What performance difference is to expect using a ferrite rod or an iron rod as wound transmitting antenna under 100 KHz ?
Would ranges be way different at a given -say 1 Watt- TX power, or not of major concern to reach 100 m distance?
RF, Microwave, Antennas and Optics :: 01-24-2017 01:16 :: Externet :: Replies: 9 :: Views: 906
Hi these are ferrite core transformers that are used in switching mode power supplies.
you cannot use them as 50Hz transformer, they are designed to be used in high frequency switching mode supplies with a switch controller IC
they are designed for specific circuit and not general ,
forget about them!
Microcontrollers :: 01-22-2017 06:16 :: hamidmoallemi :: Replies: 3 :: Views: 506
Our SMPS manufacturer says that they used an "EF13" core in the SMPS that they designed for us.
I cant find any trace of such a ferrite core shape.
Do you know of an EF13 datasheet, where i can find it?
Power Electronics :: 01-09-2017 22:22 :: treez :: Replies: 4 :: Views: 547
ferrites are ferromagnetic oxydes, ferrite cores are sintered like ceramics. In so far I don't see where epoxy or silicone resin comes into play.
RF, Microwave, Antennas and Optics :: 12-29-2016 18:01 :: FvM :: Replies: 4 :: Views: 389
Power inductors need air gaps, gapped ferrite toroids are rather unusual so you can safely assume that the API toroid chokes are powder cores. According to other datasheet comments I expect a xx-iron alloy, similar to other major powder core vendors.
I wonder if API provides meaningful data on request, or if all customers are working on a creati
Power Electronics :: 12-13-2016 08:21 :: FvM :: Replies: 5 :: Views: 494
The first one is probably Wilkinson power divider and the second one seems ferrite based wide-band divider/combiner.
RF, Microwave, Antennas and Optics :: 12-06-2016 20:06 :: BigBoss :: Replies: 1 :: Views: 292
I need to design and simulate a tlt 4:1 (made for instance in microstrip technology) with ferrite sleeve around the microstrip inn 40MHz-250MHz bandwidth. Anyone can help me? If i use ADS i could use the model XFERTL2 and i'd just need to know the inductance without the sleeve and effective dielectric constant of the coupled line, but i'd prefer t
RF, Microwave, Antennas and Optics :: 12-01-2016 11:01 :: molloy :: Replies: 0 :: Views: 361
In which mode ferrite Core Power Inductor inductance is measured? There are two modes in my LCR meter labeled SER and PAL. And what is the difference?
Power Electronics :: 11-21-2016 05:56 :: adnan012 :: Replies: 2 :: Views: 397
I guess "Magnetics" refers to powder cores. They can be considered as cores with built-in gap, so alternative ferrite cores will usually need a gap, at least if they work in an inductor or flyback transformer.
Parameters aren't really comparable, powder cores have larger saturation flux, but also higher losses, it's probably easiest to start th
Power Electronics :: 11-20-2016 12:57 :: FvM :: Replies: 14 :: Views: 893
In general a series ferrite bead with a parallel capacitor suffices for most cases, but it is just a general tip which could not be suited to some level of ESD.
Power Electronics :: 10-27-2016 18:00 :: andre_teprom :: Replies: 3 :: Views: 476
Yes, and the Output can be Either Stepped UP or Down in Voltage.
You could also have Multiple Output Windings.
Your Biggest Problem is Making a SUITABLE ferrite Core Transformer for the Frequency of Operation.
Typically it should be wound with LITZ Wire, to better handle the High Frequencies involved.
Elementary Electronic Questions :: 10-23-2016 23:47 :: chemelec :: Replies: 26 :: Views: 1861
Just a guess without all the information....
The diagram looks like it has a ferrite core so it is probably intended to be used at a pulse frequency of >10KHz. What frequency are you driving it with?
Even with lower primary current you should get considerable voltage across it's output.
Power Electronics :: 10-24-2016 18:10 :: betwixt :: Replies: 10 :: Views: 630
Very high power density can be achieved with tape wound amorphous metal toroid cores. There are also large ferrite and powder core toroids available. But toroid transformer design is involving a considerable manufacturing overhead compared to regular winding geometries.
Power Electronics :: 10-04-2016 06:25 :: FvM :: Replies: 25 :: Views: 2020
Label your dimensions per this drawing.
Just to make sure this is a ferrite core and not a iron core?
Power Electronics :: 10-02-2016 02:16 :: FlapJack :: Replies: 6 :: Views: 795
Modulation is only possible with nonlinear (active) devices, I presume.
My question was that, if the circuit is passive HB simulator will serve nothing.We shouldn't confuse nonlinearity of ferrite devices in standard circulator because this nonlinearity depends on the signal amplitude otherwise if this amplitude is relati
RF, Microwave, Antennas and Optics :: 09-22-2016 19:53 :: BigBoss :: Replies: 13 :: Views: 1027
Pulse planar 72A < 0.5 mOhm 0.45uH choke may be too lossy.
This represents 100 Ohm reactance but 36mV loss. (2.5W) @72A
So it is better to use distributed ferrite beads and smaller
Power Electronics :: 09-05-2016 01:24 :: SunnySkyguy :: Replies: 33 :: Views: 2436
The rated current specification of ferrite beads might cause misunderstandings. It's a thermal rating, don't expect much choke impedance at this current, the inductor will be mostly saturated.
PCB Routing Schematic Layout software and Simulation :: 08-28-2016 10:22 :: FvM :: Replies: 7 :: Views: 676
For a common mode choke I will prefer ferrite core,
If a differential/Output inductor go ahead with Powdered iron.
Powdered iron core available in Magnetic inc
If it is PCB integrated, should take care of rated current in the track
Power Electronics :: 08-27-2016 12:25 :: smijesh :: Replies: 1 :: Views: 309
Isn't it obvious that for low frequency power transfer the coils must be very close together or touching each other, have many windings and have an iron core and for high frequencies have a ferrite core?
Does a simulation program know anything about that?
What is CST (Central Standard Time?) and what is MWS (Medium Waxed Shine?).
Power Electronics :: 04-20-2016 14:29 :: Audioguru :: Replies: 3 :: Views: 1392
This is common mode noise, mostly generated by ground currents through your probe cable. Can be partly reduced by leading the probe cables with multiple turns through large ferrite toroids. Better use differential high voltage probes.
Power Electronics :: 08-15-2016 08:05 :: FvM :: Replies: 2 :: Views: 467
Hi! I referenced this video to create a coax air transmission line 2-port measurement.
I designed a ferrite ring, its outer radius is 7mm, inner radius is 3.04mm and length is 20mm,
the hollow part of ring and surface are set to PEC. The ferrite with relative permittivity 5 and
Electromagnetic Design and Simulation :: 08-13-2016 13:54 :: flyingoven :: Replies: 2 :: Views: 700
Both small loop and stub antenna will give similar near field signals from harmonics of SMPS pulse currents.
The small loop may be easier to locate the source of emissions, but often the conducted emissions become radiated via the interface cables, so these should be well shielded and use large ferrite donuts or clamped C shells around interface
RF, Microwave, Antennas and Optics :: 08-10-2016 17:42 :: SunnySkyguy :: Replies: 8 :: Views: 607
It is easy to reduce noise say on 50mV SMPS ripple using LC filter to desired level combined with PSRR on chip.
CM and DM ferrite beads can also reduce ingress on high impedance inputs, if the layout causes crosstalk.
I have used SMPS for video amplifiers and AMLCD bias without noise effects, but with care.
In this case I stepped down 9V to 5V
Analog Circuit Design :: 07-26-2016 11:16 :: SunnySkyguy :: Replies: 6 :: Views: 434
I did a quick search on the internet and could not find a clue about this issue.
I'm using STM32F407VGT6 in my design and I couldn't manage to run the uC yet. I've just figured out that I've used 60Ω ferrite bead instead of 600Ω(FCM1608KF-601T03) and I would like to know if this is a fatal mistake or not.
Is there anyone
Microcontrollers :: 07-21-2016 14:14 :: ogulcan123 :: Replies: 3 :: Views: 361
Most likely you have a large common mode noise interfering with a differential current source, sense.
Try a large CM balun or ferrite sleeve or twin coupled choke to the twisted pair to raise CM impedance and thus CMRR but keep DM impedance relatively low compared to Zc(f)
If that fails, reduce area of loop with a smaller gap . water has a diele
Hobby Circuits and Small Projects Problems :: 07-08-2016 02:35 :: SunnySkyguy :: Replies: 3 :: Views: 467
I'm analyzing a design of a board using a ferrite bead BLM18PG471SN1D it is 2A rated and used in a supply input operating at 15V, maximum steady state operating current is <1.4A.
The board has got an inrush current that can go upto 28A for <2ms.
I would like to know how if it is safe to use this part as im concerned about reliability.
Professional Hardware and Electronics Design :: 06-22-2016 11:15 :: ku637 :: Replies: 1 :: Views: 852
@andre_teprom , what do you mean "the reel" ? before the core? I didn't understand.The whole core is getting hot but the windings are much cooler than the core if compared, rather strange as I usually have dealt with windings getting warm upon large loads.
I was considering the possibility that the transformer a
Power Electronics :: 06-19-2016 16:47 :: andre_teprom :: Replies: 18 :: Views: 1259
The inductance value seems factor 5 higher than usual.
To make an inductor with sufficient saturation current, you'll either use a gapped ferrite core or a powder core which has a built-in distributed air gap.
I presume that you won't like the core loss level generated by powder cores at 600 kHz, gapped ferrite is probably the better choice.
Analog Circuit Design :: 05-13-2016 15:41 :: FvM :: Replies: 3 :: Views: 476
There are online calculators for smps.
It's a frequent topic here. See the list of related threads at the bottom of this column. Or do a forum search. Example, buck, boost, buck-boost, flyback.
I dont know how to build the transformer
Many find it is easier to start with a ferrite core, of a size rated to store the required ene
Power Electronics :: 05-09-2016 15:44 :: BradtheRad :: Replies: 3 :: Views: 587
Closed i know but...some would say dont bother fussing to cater for the transient case of "max vin AND max duty cycle" occurring together...just put a small 0.2mm gap in the ferrite core, and then the onset of saturation flux density will be more gradual and more easily catchable by any overcurrent limit.
It is that "Nuisance" case of "max vin A
Power Electronics :: 04-28-2016 15:24 :: treez :: Replies: 3 :: Views: 428
If you could do it with a mains transformer there, then you could do it with a smaller ferrite transformer there too, and so you would , instead.
Power Electronics :: 04-25-2016 08:51 :: treez :: Replies: 9 :: Views: 785
Your datasheet is a simple inductor rather than a transformer. A buck converter normally has an inductor with a single winding.
To find specs for making your own inductor, there are online calculators. You can purchase a ferrite core. Or, a DIY-er might make his own steel-particle slurry by cutting up steel wool and mixing 50-50 with silicone.
Power Electronics :: 04-19-2016 15:33 :: BradtheRad :: Replies: 4 :: Views: 785
For such low frequencies, you should use an iron core instead of ferrite. You also should specify the voltage amplitude and source/load impedance. Basically you're making an audio transformer but for even lower frequency.
Power Electronics :: 04-04-2016 19:35 :: mtwieg :: Replies: 14 :: Views: 536
i'm designing dc dc converter for 40kHz PWM freq. and ferrite core transformer is 250uH will it support ??
Power Electronics :: 03-16-2016 06:51 :: kiransbaddi :: Replies: 4 :: Views: 611
Is an air coil better in terms of temperature stability, as compared to a ferrite or powdered toroid?
RF, Microwave, Antennas and Optics :: 03-08-2016 22:19 :: neazoi :: Replies: 5 :: Views: 548
For measurements on a dual-band 2.4/5GHz WiFi antenna (printed IFA), we guess there are somewhat leakage current on the outer conductor of test cable connecting to the antenna under test. Could you please recommend some parts like ferrite and balun module (two ports) with SMA connectors? Thank you so much.
RF, Microwave, Antennas and Optics :: 03-01-2016 23:09 :: supersage :: Replies: 3 :: Views: 713
Carrier frequency of the shown power line remote control is 100 kHz rather than 315 MHz. But the coupler could be basically designed similarly. You preferably operate the transformer in resonance. Air core or open ferrite core with a very few windings. I presume you know basic LC resonator formulas (or can review it on the internet).
315 MHz is
RF, Microwave, Antennas and Optics :: 02-19-2016 14:25 :: FvM :: Replies: 6 :: Views: 869
I have a problem(I think), I have a linear regulator that is being supplied by a switching converter and as such I want to use 1 ferrite bead each on the linear regulators input and output. But that regulator is supposed to supply 10A max and while looking for beads I can find beads rated for 10A and 10,5A at the most.
But I have heard
Analog Circuit Design :: 02-08-2016 04:21 :: David_ :: Replies: 25 :: Views: 3198
FVM is right that the circuit in your pic will never do wideband, but I have seen similar using binocular (2-hole) ferrites and bifilar wire. I'm uncertain those will handle 1Watt.
RF, Microwave, Antennas and Optics :: 02-01-2016 19:28 :: ge :: Replies: 11 :: Views: 846
Hopefully the little dcdc?s have some ceramic capacitors as close as possible to them, (if not put some there)
I support this recommendation, which can probably be one of the most effective care to achieve a significant reduction of noise with high rates of dV/dt. Anyway, the Insertion of ferrite beads close to the
Power Electronics :: 01-23-2016 11:21 :: andre_teprom :: Replies: 11 :: Views: 821
Does anyone know if 0.1mm gapping pieces are available to put between the core halves of an ETD44 core so as to give a 0.2mm gap?
This is needed because the cost of gapping by grinding the cores is ridiculously expensive
Power Electronics :: 01-14-2016 15:40 :: treez :: Replies: 15 :: Views: 801
FB1 FB2 FB3 L301 L302 are components that could be missed out......but just choose any ferrite bead to replace them, anything that can handle the current in them, and not drop too much voltage in passing the current.
- - - Updated - - -
TI T2 and T3 are all the same part...the bom is weird.
they are all c
Power Electronics :: 01-10-2016 19:58 :: treez :: Replies: 6 :: Views: 625