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# Coupling Coil

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46 Threads found on edaboard.com: Coupling Coil

## Characterize the coupling coefficient between one power Tx coil and one data Tx coil

Hi All, my system have a set of power coils and a set of data coils. Ideally, we want the coupling coefficient between the power coil and the data coil to be zero to minimize the interference between them, espcially they are operating in a closed frequency range. In this paper "Enabling Wireless Powering (...)

## Questions about the interference from 6.78MHz wireless power coil to data coil

Hi All, I have a class E PA operating at 6.78MHz to drive wireless power coils. I also have the data coils using inductive coupling method on the same board, whose input frequency can vary in a range. For example, my input frequency range is 1MHz to 5MHz, and I picked the resonant capacitor to resonant with the data coil at (...)

## How to Convert dBuA to EIRP

The other problem involved with the calculation is that 10 m is absolutely near field (lambda is about 40 m). Any calculation based on free space transmission or coupling of electric and magnetic field will give wrong results. Simulating the exact shape of the transmitting coil and it's magnetic field will give you a much more accurate result. T

## RF reciever circuit doubt

R5, C1 and C6 are there to filter out any noise from the supply line. C6 is needed because elcos aren't very good at RF. The purpose of C6 is to ground the RF currents in the tank circuit, necessary for the feedback that makes the circuit oscillate. If you don't want to make a tap in the tank coil you can use the capacitive coupling in the first c

## question of frequency transfer of inductive link for wireless power transfer system

(1) Yes, what goes in comes out if its direct magnetic coupling. Definitely the same frequency and same sine waveform. (2) As the coupling is purely magnetic, what amplitude comes out depends on both spacing and orientation. In fact you can twist the receiving coil about and very likely find an orientation where no energy at all couples, (...)

## Inductors of LPF wound onto the same toroid

No, you can't do that because it would create magentic coupling between the inductors. For the low pass function, it is important that both inductors are NOT coupled.

## 10MHz instrumentation amplifier oscillating.

Can't you connect the center-tap of the coil to the +2.5V reference and direct-couple the opamp inputs to the coil without the input coupling capacitors? Then the noninverting inputs will be biased properly.

## Coupled Mode Theory for Wireless Power Transfer

The question has been gelling in my mind, as to which process is more feasible, or more efficient, or more prevalent: (a) magnetic coupling, or (b) electromagnetic/photon transmission? When we recall that an old-fashioned crystal radio receiver can operate without batteries, by drawing its power from a broadcast antenna miles away, then a new re

## contradiction in coil dimensions in this drawing of wire collinear by G-7RGQ.

Wounding a certain length of wire into a coil won't make a phase shift equal to the wire length. This is due to the EM field coupling involved, which can lengthen or shorten the time delay.

## single coil latch type relay driven with AC?

AC type Relays use a shaded pole type magnetic coupling much like AC motors with shaded poles, so the force is smoother. within the full cycle. But certain AC solenoids running off single diode rectified line AC can move fast enough to act as a spring resonant water pump. THis is what is used in Expresso machines for cold water with a plastic pres

## 13.56 Mhz Power Supply

2kV @300W is equivalent to < 7 A so step up transformer with low primary ESR loss and low Eddy current loss is needed i.e. air coil, but will have poor coupling factor and radiate dangerous EMI to eyes. COnsider Klystron tube & Microwave transformer (MOT) 1.5kW > 1GHz with resonance arc at several kV inside oven using aluminum foil. Also dangerous.

## Fan speed control using PWM signal

The signals where the diodes are present do not get connected to any windings/ coil. So no back emf here. May be because of mutual coupling due to wire routing or some other incidents which may result in higher than 5V on these lines, the diodes are used to limit them to not more than 5V. The series 100 ohm resistor limits the current to safe value

## What to do with grounds on either side of a power transformer?

There is a large common mode noise generated with floating SMPS that can be problematic for unbalanced sensitive circuits. e.g. external microphone inputs on laptops. Although primary side grounding reduces conducted noise getting back into the line, there is always a coupling capacitance from primary to secondary coil. When no secondary ground i

You're talking very generally about "coil" versus "antenna". I suggest to think about useful frequencies for wireless energy transfer and intended coupling mechanism (magnetical, capacitive, electromagnetical). Consider that your charging system must not interfer with radio communication.

Each capacitor appears Zc=1/(2pif*C) + ESR. the diodes are dynamic resistance and depend on size. You wont be able to match the impedance because the coupling current and spacing loss makes the input impedance high and the closer you get, it can drop below 50 Ohms. You are much better off using a step-down inductive coil antenna to boost the

## coupling coil simulation on hfss

can any one send one me the .hfss file of coupled coil simulation. i already make the receiver coil i face some problem with making transmitter coil , i can't excite it. Thanks

## Coil design for inductive coupled circuits

I think what you are after is a "grid dip oscillator". This was a hand held variable oscillator, whose oscillations "dipped" when it was near a circuit which was tuned to its frequency and hence absorbed energy. So you have to sweep your generator frequency and look for RF being absorbed from it. I would make the inductance of the L as high as

## coaxial exciting coils

note: I'm electrical engineer and familiar with electromagnetic theories. So you know that the metal cylinder is shorting the field of the coil and the coupling between both coils will be very low? It's an axisymmetrical AC-magnetic problem. It can be solved e.g. with Quickfield or FastHenry.

## Current sense coil number 2...

Yup it will. But it depends on coupling factor as well. Generally for current sense, primary conductor is also wound for a single turn over the coil to give a better coupling factor.

## inductance of spiral coil in sonnet

How can i check the inductance of a octagonal coil 3mm x 3mm in sonnet? How can i simulate coupling between two adjacent coils in sonnet?