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119 Threads found on edaboard.com: Air Gap
Can anyone pls help me how to implement mems capacitive shunt switch in HFSS.How to take design parameter and how to choose the air gap and also whether we put excitation or boundary to it in software..pls rply
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 (...)
Are you using air as substrate ? Interested of air you can also use low dielectric constant Foam materials.
For this to work within safe limits will require a really large air-gap of > 6 mm, depending on material type. With such large gap, your other problem may be the fill-factor. You won't be able to get the required number windings to fit on the bobbin.
How to calculate resonant patch length for aperture coupled patch? For certain Er value there are formulas to obtain patch sizes. If substrate is separated from ground plane by air gap, how Er is affected? I guess Er becomes smaller, and patch size must be increased to compensate for this effect. Is there any numerical solution?
Increasing the thickness and using an air gap can help increase bandwidth. Parasitic elements and multiple probes to feed the aperture can help too. I got a patch to 50% bandwidth but it was a chore as patches are usually narrow band. -10dB s11 seems to be the usual target over wide bandwidths. Waterhouse has interesting suggestions in his book
A standard inductor design procedure would first choose the core material depending on frequency and ripple magnitude, then select the core size according to stored energy 0.5*I?L. Then calculate air gap, wire gauge and number of windings. 15 kHz can be still handled by regular (thin) laminated iron.
On the pcb, we could separate the through-holes more than 5mm, but it will not change the fact that the leads coming out of the case have a distance along the surface of the package of ~5mm. 3.3kV seems like a lot for a 5mm spacing on the package. In fact, a gap of 5mm for 3KV seems too near in air, but we shoul
Current transformer with air gap? Very unusual. What do you want to achieve with it?
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 (...)
Pls, forum members i recently came across a paper online on how to optimize rectangular microstrip antenna using air gap technique. I have tried for more than two weeks without ant success, the design is in two phases. the first one is without air gap which i have uploaded the HFSS design here while i have no idea on how to (...)
Hi, To find gap-Map, using FDTD, for square lattice of dielectric coulumns in air, I choose the 'X' position in reciprocal lattice, while varying the radius of the rods. The result is good. But while considering the triangular lattice, I am a bit confused to choose the point in reciprocal lattice. Is it the 'M' or 'K'. Where the gap opens?
Hi, I'm planning to immplement suspended antenna design. I'm thinking the only difference between patch and suspended patch is the dielectric constant in patch changes because of additional air gap in suspended patch. Also, the width of dielectric changes. Please let me know if I'm heading in right direction. Regards
Hi I'm studying field radiated from spark discharge (air gap) by using CST simulation. Anybody know that this program including dielectric breakdown or not. becuase I try to simulate field radiation from spark discharge and then compare to another resreach.
For low frequencies like 17 kHz, laminated iron respectively cut tape core with air gap is usually the preferred solution.
What is the hotspot temperature rise at full load? What is the surface linear air speed? I suspect the eddy current losses are diminished with the 5mm thermal conductive dielectric gap. edit PQ35/35 has been discontinued since 2011 yet PQ40/40 is not. Cores must be burnished prior to assembly.
I believe you'll find many schematic drawings of a dynamic (moving coil) loudspeaker showing the magnetic path, e.g. The field in the air gap is in fact purely radial, in other words perpendicular to both the coil wire and speaker axis. So you can perfectly apply le
Energy is usually stored in precise air gaps for precision regulators. Otherwise gapless ferrite stored the energy between the magnetic particles which give a smaller effective gap that has much wider tolerances for saturation and thermal effects. Eddy current and skin effect losses can be improved with Litz wire (...)
Hi all i'm going to design an infinitesimal electric dipole above an infinite pec for height lambda/2.I'm going to earn figure 4.17 in antenna book,Balanis but the results aren't good at all.(VSWR and radiation pattern) i don't know how length i need for air gap in infinitesimal dipole?and don't know what is the problem? I'm using HFSS13 and d
A reasonable transformer design tool should give you core size and air gap, wire gauge and number of turns. Manufacturers of magnetic components, e.g. Coilcraft and Wuerth electronics have a number of catalog flyback transformers, you may find a type that roughly fits your specification.
I have a coil that fires across 5 series spark gaps in air. I'm having trouble calculating the energy needed to breakdown the gaps. Also been reading a bunch on spark gaps and I'm confused how exactly does it work with multiple series gaps. charge is applied to SG1+ and SG5-. What is happening leading up to (...)
hi Is it possible to design fly back converter using toroid without air gap?
Try fitting an air gap (a bit of sticky tape!) to the pole piece. If the door stick with 15 KgF then there is no point in using 50 KgF Frank
Most power tranformer for mains have the EI core, interlaced for better efficiency and solidity. A non-interlaced EI core also works. air gap between laminations is kept to minimal in its assembly. What are the effects of slightly increasing the air gap between core sections ? What changes are to expect in the (...)
Hello My goal is to create an air gap structure manually in the ICT file using the airgap{} syntax What I observe in the VIEW ICT for example is that the air gaps are getting created right above metal2 in the metal2 dielectric instead of forming in the gap between the (...)
Glass has a permittivity of around 4 , the same as paper and circuit board material. Being a good insulator, it will not affect the conducted field at 1MHz however charges may accumulate on contaminated air or surfaces which may result in a partial discharge in a tiny gap < 300Vpp, so keep it clean. Light weight gasses may also reduce the diele
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
The energy in ferrite is stored in the gap between ferrite particles. air gapped torroids are more precise and less lossy.
Hi sandbo, In working with CPW lines in HFSS, I've found that meshing the air gaps with a maximum length of half the gap width is sufficient for good convergence. I've also found that meshing the air gap seems to be more important than meshing the strip, which it appears what you are doing.
I am designing a DC-DC converter for impedance matching of my piezoelectric energy harvester with flyback converter. The switching frequency of the dc-dc converter is about 1kHz. The voltage is around 20V and current is about 2mA. I made a transformer using EPCOS EFD 20/10/17 B66417U0160K187 core with air gap. It has one primary and two output w
B mm Overvoltage (2s) 1.9 1500 790 V/mm 3.9 3000 770 V/mm 5.0 4000 800 V/mm air can breakdown with sharp edges around 1kV/mm but may withstand 3kV/mm with smooth conductors and contaminate gap with sharp points below 500V/mm Some Ceramic or epoxy coated packages "can" be rated perhaps 5x higher, if clean. I hope this pu
You don't need to. Just put them side-by-side, making sure there is no small air gap between them.
There's no thing like an "allowed percentage". But a large air gap will involve increased leakage inductance and possibly additional eddy current losses in the winding. In some designs, the coil former zone around the air gap is kept free of windings to reduce this effects. Beyond "allowance", when I see a core design (...)
Because your pot has no terminals , there is nowhere between which you can measure inductance. If you sit it down on your exciting inductance, the air gap between the two will have a massive effect. Just build a test jig and see what the effect is on the exciting inductance. Frank
input voltage 220V AC Out put Voltage 36 to 42V DC @2.5A - - - Updated - - - There is a air gap in E type core for Fly-back type converters. For toroid it will not work?
this is phani kumar. i am working on designing of SMPS and led drivers. i have a query regarding air gap in transformers. Different techniques of air gap in transformers: 1) keeping some milar sheet as an air gap. 2) cuting some part of 1 core. 3) Cutting both cores. please (...)
In Gieras/Wing, Permanent Magnet Motor Technology - Design and Applications, I find a paragraph about single phase BLDC motor design. They are made e.g. with non-uniform air gap to generate a starting torque. They are basically suited as a replacement for single phase AC motors (e.g. shadow pole type) with considerable better efficiency. Sim
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.
Hi Fellows, I wonder if anybody could help me to verify the Trace Width to match 85Ohm impedance for Differential pairs (surface microstrip) for a two layer board. Currently I have used 12mil/0.3mm trace width with 5.5mil separation. TOP side would have these pairs & BOT would be a GND copper pour. I am confused about the Lower Trace/Upper tr
O.K., I got your point. I was under the impression that the heatsink case is isolated from the metal base plate. In fact it can't be clearly seen from the video if it is. In any case, air gap and creepage distances for 115 respectively 230 V, reinforced insulation must be observed. P.S.: Reviewing the fact sheet, I see that the lamp is desi
I agree with Frank that using ferrite (with air gap) or iron powder inductors for 100 (or e.g. 1000 Hz) just makes no sense. It's a waste of money, weight and design space. Use regular laminated cores with air gap, if inductors are actually an appropriate filter means for your design.
Your secondary voltage will be limited in one case by the turns ratio and the breakdown of the switch FET. The FET will get beat up if the plug cap fails to break over and you have a lower breakdown path than the back-referred air gap (which is higher breakdown in operation than in free air testing). A snubber network can relieve the (...)
I've already tried this, but i could not get two resonances close enough. Got good results only with thick substrate about 7-8 mm Yes it`s true. Better bandwidth are with air gap and normal dimensions ( electrical dimensions equal to physical ) . Also possible some multi path, four for instance. It will be better.
Hi guys, i wanna ask u something about chokes or gapped cores. I will implement PFC circuit and SMPS but i dont know whether i need to use choke or gapped cores. I have read some books but they mention different things for this issue. Some of them just use ungapped cores while others dont for both PFC and SMPS. PFC is CCM boost type (...)
There are "complex" calculators, e.g. the ferrite tool downloadable from Epcos. Saturation of a particular core (material, cross section, effective magnetic length, air gap) is given as a specific ampere-turns product. So rewinding an inductor will of course change the saturation current. As you might guess, increasing the inductance gives a low
The center hole can have thread. When using a core with an air gap, a tubular ferrite can be screwed into the hole to change the AL value, hence the inductance. This is frequently used in filters that require tuning.
All capacitors (except maybe air gap) are going to have some nonzero temperature coefficient. What temperature range are you looking at, and what kind of variation is tolerable? One option is to make a MMC array of class I dielectric caps (NP0), if you really need low tempco operation. Using a high quality film capacitor m
Yes you can have a stepped gap DC choke, where there is a small part of the core with no gap giving a higher inductance at light loads, at higher loads this bit saturates under the DC bias and becomes effectively an air gap...!
Due to the large inductance of the secondary coil,the "air gap" makes for the capacitAnce that resonates with the coil. Sounds unlikely. Even with open coil, the resonance frequency will be most likely dominated by the coil self capacitance, the air capacitance only adds up. Due to the "air capacitance", the resonance can (...)
Hello! I am a newbie in smps, I making a smps with input 33VDC, output 12VDC 1A using UC3842. It work but there are some problem: - The mosfet, and diode D1 overheat. I dont understand what happen. Please explain to me. This is schematic 84695 The flyback transformer use EE25 with air-gap 0.25mm, primary winding is w