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245 Threads found on Ferrite Core
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 (...)
Hello, We are trying to work out the peak-to-peak B (flux density) allowed in our 40KHz Full Bridge SMPS transformer. The maximum ambient for the transformer will be 45 degrees C. We are using a Epcos TDK PM62/49 core, centre leg gapped to 0.2mm. We have it in N87 ferrite material. PM62/49 ferrite core datasheet:
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.
The standard transformers don't work at 500kHz but your may find ferrite core transformers (or you can do it yourself too) that would work at that frequency.Don't consider L-C matching etc. circuit because power is really high, small components ( except special ones) can not resist to this power level. The optimum way is to use a ferrite (...)
Hi, I need help on ferrite core transformer design. I want to use TDK PC40-EE55/55/21 core. So please any body help me to calculate number of turns against 20Khz full H-Bridge drive.
I presume you have an idea about the block diagram of the inverter. To use the ferrite transformer for battery charging, you need to feed the high voltage winding of the transformer with a 50 kHz AC voltage. How do you chop the mains voltage (probably after rectifying it)?
Please suggest some good sites or tutorials for magnetics design like power inductor design , transformer design , core selection guide for ferrite as well as laminated core. Hi Rajnaveen I highly recommend you to read the thread which comes in below , from first page up to the latest page :
If no other interference effects are being perceived on each board circuitry itself, means the path of magnetic flux field is well confined on ferrite core, therefore mutual coupling between inductors placed at neighbor boards could be presumably negligible, in theory. Anyway, it´s quite important to know the exact location of logic/magnetic ma
The detector diode does not have a load because crystal earphones do not conduct electricity. All the crystal radios on the internet have a 47k resistor as a detector load in parallel with the crystal earphones. 12.5MHz is shortwave. The coil is usually 10 to 20 turns on a ferrite core (your air-core coil is for 80MHz) and the capacitor in (...)
I am designing a 50khz transformer with following specifications 0.2 Tesla circular ferrite core 15 volt 500ma can anyone say the core where i can get with these specifications and also please tell me the where can i find the sheet that gives core area and window area for 0.2 t ferrite (...)
Epcos has the ferrite Magnetic Design Tool to support the calculations
Why we cannot use ferrite Material core for 50Hz application instead of Laminated cores? Who told you can't? It's pretty possible, but not reasonable. You simply have to calculate number of turns according to a meaningful Bmax value. Because Bmax of ferrite is about 1/4 of laminated iron core, consider a (...)
it surely can't be powdered iron in a 70KHz smps? It "surely" can, review e.g. Magnetics data sheets. If you're not colour-blind, you should recognize the difference. Powder cores have a slightly brownish or "warm" grey shade, opposite to black til neutral grey ferrite. It should be noticed that an E-core isn't magnetically optimal
Hello, Basically, I want to build a two stage buck converter as a charger for a (solar) battery string. 104767 I want to build those two inductors using some torroidal iron powder cores. I still didn't finish the calculations so I wonder if there's any problem if I'll buy some larger torroidal cores as theoretical
Hi, I'm designing a miniature 100mH inductor, the external diameter of the inductor is limited to 3.6mm, the length could be 20-30mm, resistance should be less than 240 Ohm. The operating frequency is between 10..30 KHz. The coil should have closed magnetic field lines to avoid interaction with external objects / fields. At the moment I can'
Can you imagine a reason why it shouldn't be possible? Apart from this general point, N27 isn't particularly "high frequency" ferrite, rather dedicated for power transformers, predecissor of N87 etc.
Hello All, I am building a Pure sinewave Inverter.Now, when I connect my dc-dc converter to the drains of my full bridge inverter (SPWM section) my ferrite core tranformer begins to make a sound and then after a little while I see smoke coming from it. What could be the problem? I was wondering if it could be the LC filter at the output of the
Break a spare one in half and leave it exposed to humid air; ferrite is nearly inert (black oxide), powdered iron will rust somewhat on the freshly broken faces.
Hi, I want to plot the Hysteresis curve of a ferrite base on Jiles-Atherton Model using java. From ferrite manufactuerer's datesheet, I can get the parameter Bsat, Hsat, Hc, Br, ui. How can I apply the parameters to obtain thouse parameters Alpha, Ms, a, k, c of Jiles-Atherton Model ? Regards, rocky
How to choose the core(powdered iron core or ferrite core) for filter inductors(Differential mode inductors and common mode inductors) in EMI filter design? Please guide. Thanx in advance.
Loop the motor wires through a ferrite core with as many turns as you can, with .1 MF capacitor each side of it between the wires. Also connect a .01 MF capacitor directly from each brush holders to the motor frame. Make sure that the motor circuit wiring (high current) goes directly to the battery (it should be twisted). Any low power wiring (rece
Hello, Here in MaryLand we have to make a 9uH inductor which will be used in a 650W, 200KHz, CCM boost converter. The inductor current is triangle between 47 Amps and 42Amps, with around 45 Amps RMS current. We only have the PQ40/40 ferrite core set so far, but is there any smaller type of ferrite formers which are used for inductors (...)
Hello, I am working with 180W , 36V, 5A rating forward converter, i am facing problem with resetting the core using Reset winding. i have used EE42/21/15 ferrite core, primary turns is 25, secondary turns is 30, reset winding turns is 25, auxillary turns is 3. i have use RG2 fast recovery diode having 100ns RR time(trr). 10256
Hello, Is it ok if my LT3791-1 pwm controller is sat right underneath the power inductor of the boost converter? Its 650W, and vin = 18V , vout = the inductor is on the top side of the PCB, and the controller is on the bottom side, right beneath the power inductor. The inductor is in a PQ40/40 ferrite core set. PQ series ferrite c
No, litz wire won't provide any real advantage at VHF. Coaxial transmission line transformers are probably your best bet, and 61 ferrite is a good starting material. Low permeability powdered iron mixes like 17 are more suitable for high-Q inductors, and wouldn't make for a very efficient transformer. Plus I don't think anyone makes powdered iron b
Pls guide me to design footprint for ee1304 vertical 10pin bobbin for my ferrite transformer..... I am new to eagle...........
A reasonably designed resonant inductor would either use an air gap (ferrite core) or a low to medium pearmeability powder core, which has acceptable temperature drift.