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271 Threads found on edaboard.com: Ferrite Core
Hey , so I finally finished my smps which is a half bridge driving two IGBT's , all seems well , the IGBT's are barely warm etc but the transformer is getting hot even under longer periods of light loads. The wires are not how they are simply warm and even could be that way because the core is giving off heat , the part that gets hot is the ferrit
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, (...)
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
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
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?).
EP13, ok you download datasheet, choose a ferrite for your switching frequency. Then you get AL value for it. Then AL = L(nH)/N^2 Then to check for saturation (Bsat = 300mT)?do B = (L. Ipk) / (N * Area) Area is the Amin value, the minimum cross sectional area of the core, given in the datasheet. You may have to use a gapped core (...)
hello experts i'm designing dc dc converter for 40kHz PWM freq. and ferrite core transformer is 250uH will it support ??
Hi, Is an air coil better in terms of temperature stability, as compared to a ferrite or powdered toroid?
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 (...)
It's either a tuned circuit or a tuned transformer inside a metal screening can. The component betwen the green arrows is a ceramic capacitor. The screw on top moves the ferrite cap up or down a plastic core to adjust the inductance and hence frequency it is tuned to. The can style is standard, probably either 7mm or 10mm square but whether it is
I Assume your using a ferrite core for this transformer? Why not just use a few smaller diameter pieces of Enameled Magnet wire, twisted together to make your own Litz wire?
Hello, Operating a ferrite EPP core pulse transformer in a 170 degree ambient is too hot for ferrite? (its for a buck converter high side fet drive pulse transformer) Page 81 gives u vs temperature for N87 ferrite.
It definitely looks like a Small ferrite core Transformer and it shows no sign of being bad. Very Doubtful that is your problem.
Here is a spice model that you can use: *SRC=Untitled;Untitled;Transformers;;Siemens Matsushita, E19/8/5 *SYM=Untitled .SUBCKT Untitled 1 2 3 4 *Siemens Matsushita, E ferrite, N67_30300K_100C, E19/8/5 ** ** ** ** Rdc1 N41 N61 16.83 Lmag N41 2 0.2237 Rcore N41 2 504.1k Rac1 N61 1 52.30 Lac1 N61 1 97.10u ** ** ** ** L12 N
I am trying simulate a ferrite core antenna and coil integrated. but I do not have idea by where start. please can you hel me? I need know how simulate with CST the ferrite material or how called or I have that create a new material with its own characteristic. The antenna start up 20 to 200 Mhz.
Hello, We are designing a 3kW LLC converter (battery charger) with Vin=425VDC, and Vout = 400vdc, 3kW. (schematic below) Please give your opinion on the core losses in the PQ3535 ferrite core that we are using as the LLC converter transformer? (It uses ferroxcube 3C95 ferrite and is centre leg gapped for an AL value of (...)
hi How ferrite core Effective area (Ae) and Window area (Aw) calculation are calculated? Attached files have data for E20/10/6 core. The are is 32.1 mm^2 , how this value is calcualted?
My guess 67 = Epcos N67 ferrite, 25 to 300khz. It has a little more core loss than 3C85. 3C85 ferrite = Feroxcube 25 to 200KHZ. ETD59 core is a shape not a ferrite.
Hi I am trying to find the matching ferrite core all I have is this part number ferrite core d3,4/l3,2 I am not able to locate it anywhere - - - Updated - - - OK, I think it should the following. Dia - 3.4 mm Length - 3.2 mm
I am looking for an example or a step by step tutorial for setting up a low-frequency analysis of a typical switch-mode ferrite material transformer. I am, in particular, interested to extract core and copper losses in the results. There are many examples of other types of problems with CST Studio but after searching for days on Google and YouT
But the coil will have interwinding capacitance and a Self Resonant frequency, so you will care and what frequency you choose and what losses you have. Skin Effect losses increase with frequency. ferrite core losses increase with frequency But coupling losses reduce with rising frequency where the gap must be < diameter and gap losses reduce with
This is due to the flux skin effect on the steel core, causing a large drop in permeability. ferrite has an insulative binder between metallic particles and thus capable of higher currents.
The most widely criterium adopted for choosing the ferrite size is the Ae parameter ( which in the above datasheet is equal to 32.1 mm2 ). You can determine its value by using a step-by-step procedure which can vary a few from an author to another. Although it is possible to find on the web online tools which do tha
the core clamping parts on pg 288 are made of brass, and are virtually "in" the ferrite, so they will surely suffer much eddy current heating? Even if some heating occur there, should be due to the Foucault currents, which are strongly dependent on the width of any rod or screw placed inside the ferrite hole. Anyway
Hello, We are doing a 7.4kW Full bridge LLC converter. (vin=400VDC, vout = 300-410VDC). Please advise if we are overheating our transformer? We are using a PM87/70 ferrite core (Epcos) for the transformer (N87 ferrite). We have a 0.4mm gap in the centre leg of the transformer, which we calculate gives an AL value for the gapped (...)
As you know, N87 ferrite can run up to well above 100degC?... (as attached, from the Magenetic Design Tool download of Epcos TDK)
EPCOS ferrite tool ends up with Bmax of about 275 mT for 40 kHz full bridge with PM62 core, based on 25 K core loss induced temperature rise.
Hello, We wish to use a PM core by Epcos for a switch mode transformer. These only come with ferrite materials N27 and N87. We are doing a full bridge converter, 2kw, vin=380vdc, vout = 360vdc. The Epcos ferrite databook does not specify what is the permissible frequency range of these materials. Do you know what it is? Epcos (...)
The ferroxcube Soft ferrites databook does not state which ferrites are best for use at which frequency.. Ferroxcube soft ferrites databook: I am making a Boost PFC inductor for 70KHz operation using a PQ core. It can be in materials either 3C81, 3C90, 3C91
Hi, I would like to get started with SMPS design there are lots of application notes with test report available for designing it. The manufacturer of the Transformer has given only the core type of ferrite core transformer and its dimension and there is no m
I have designed and implemented the flyback transformer using the EE30 ferrite core and the switching frequency is 20kHz, no switcher IC has been used and i am just driving the mosfet irf630 at 20kHz using gate driving IC ir2110 and gaing signals from PIC16F616. The converter was designed to give output voltage of 25V at
Hello, I hope this is the right forum to ask this. I am attempting to find the datasheet for the ferrite core SFT-59SN from TKK industries. It seems a rather popular item, according to the references found on the internet, but the datasheet is nowhere to be found. Does someone has it, or can at least give me some characteristics (e.g. core (...)
Knowing the frequency will make it easier to guess the AL. You wont be very wrong if you get similar size core that is made for power transformers, most materials are about the same. Au contaire, @vbase each supplier has at least a dozen types out of a thousand different mixes of ferrite. for example TDK have hundred
The ideal transformer is a choice, but it doesn't have any input and output inductance. How to simulate a HF ferrite core transformer in ADS if the input and output inductance need to be included?
hi everybody. my project use the push pull amplifier, working in 1-30MHz. I using ADS and had some FET model, but i can't know how to build transformer ferrite core model. 1.can you show me how to build it and the manufacturer ferrite core are often used?? 2. a my friend gives me a noname ferrite (...)
The two ferrite cores have to be held together for the transformer to work. The tape could be holding them or the tape was used to hold them together while the glue dried.
Hello, We are doing a 60W isolated offline flyback (120W peak). We are using an ETD44 ferrite core with 1mm gap. The transformer winding company say that they cannot glue the ETD44 ferrite core halves together because it is not a robust method of adhesion. Is this true? They tell us that they must instead use the (...)
The N87 material data can be found in the first part of the ferrite data book. You can also use the Epcos ferrite calculation tool to estimate core losses. 350 mT is below saturation but involves huge core losses. Question is about switching frequency and duty cycle of peak load. If it's more than a few percent, the (...)
hello I want to design an electronic circuit charger for Laptop from 12 to 19 volts , i want using DC-DC chopper with ferrite core , how can calculate L,H,turn,length of wire and wire clip ??
More information required: Switching frequency, ripple current. Up to 10 or 20 kHz, laminated iron is suitable, for higher frequencies, ferrite cores are suggested.
get a bunch of these:
The core losses are specified with the general sifferit material data, e.g. N87, not the individual core data sheets. I don't have the documents that are relaunched under the TDK brand, but I presume they still have the information that was previously available. There's also the ferrite calculation tool.
The difference is mainly not related to operating frequency, it's small signal versus large signal. You can refer to the supplementing PC47 ferrite material documentation from Epcos/TDK for details, also regarging exact frequency characteristic.
Please, can any body help me with edt-5901 data concerning power rating,ferrite core
Hello everyone, I need a ferrite core no. with small air gap which can deliver 50Watts @100KHz, It must be common and easily available. i'll use it in a forward converter. Hi --BawA-- Have a look through this thread ( read it from it's first page till the latest page , you'll catch what you're looking for and more . ) www.ed
They operate at high frequency (in several KHz) , and uses some magnetic elements like ferrite core, so EMI would be an obvious issue , but this issue can be mostly addressed if the proper layout routing rules are followed , like shorter and wider traces, avoiding right angle traces etc Use of Decoupling capacitors on Vcc pin of IC is also a good p
I have used 17 wires in parallel to make make a litz wire. what is Lm ? btw i have got Bmax as 1800 G. I suggest you use this although it does not have torroids, it has all the calculations for ferrite materials and different
i have deployed irf540 x2 with a ferrite ee core ee core is 30mm x 6mm i hand wound the eecore with primary 12turn ct 12turn sec 180turns ...took idea from here i just made the stepup ckt error in ckt i correct
A ferrite cored transformer works best at medium frequencies and certainly not DC so you need to convert your 5V DC to at least 5V AC at maybe 50KHz before the transformer will work. It can be a difficult topic and not easy to explain in a few words. Do some research on SMPS (Switch Mode Power Supply) for ideas on how it works. Brian.
Single balanced mixer uses only one transfomer. DC saturation of ferrite core will only change inductance of windings. Mixed signals are producing much less change in magnetic density of core than DC current in separate winding can do. Signals are practically always in linear part of magnetic curve although it's slope is changed.