Frequency Shift Keying FSK method for wireless power transfer

[areebaa]

Hi ,
I would like to design and test a FSK modulation method so that it can be used for wireless power transfer receiver Coil.
Thanks

 

[KlausST]

Hi,

Afaik FSK is for data transmitting, but you talk about power transmitting.

What do you realy want to do?

Klaus

 

[areebaa]

thanks
I mean to use it with power + data transmission in an inductive coupling.
if already power transmission design exists could we use FSK modulated signals over power coil ? if yes How to design such FSK modulator

Hi,

Afaik FSK is for data transmitting, but you talk about power transmitting.

What do you realy want to do?

Klaus

 

[c_mitra]

Are you talking about the smart cards that get the power from the RF signal? Don't expect too much power...

 

[betwixt]

Should be possible but FSK is just a change in frequency to represent a zero or one. Send the data to modulate the oscillator frequency at one end and use a PLL to recover it at the other.

I suspect the 'smart cards' are RFID which uses a different system altogether.

Brian.

 

[FvM]

I'm not aware of an inductively coupled smart card standard using FSK for reader-to-tag communication. Mostly ASK.

The reverse channel is using load modulation (also AM), partly with sub-carrier.

 

[c_mitra]

Are you talking about the smart cards that get the power from the RF signal?

I should have been more careful. I meant 'something like the smart cards that receive power from the RF signal'...

But FSK system too use a carrier and the carrier can be rectified to charge a capacitor to drive a small detector...

 

[FvM]

Back to the OP's last question

if already power transmission design exists could we use FSK modulated signals over power coil ? if yes How to design such FSK modulator

You are talking about a proprietary system designed by yourself or a system according to an existing industry standard? Which communication direction do you intend, power transmitter to receiver, reverse direction or both?

Popular Qi standard is e.g. implementing a reverse communication channel by load ("backscatter") modulation, a kind of AM with bi-phase bit coding.

 

[Warpspeed]

Hi ,
I would like to design and test a FSK modulation method so that it can be used for wireless power transfer receiver Coil.
Thanks

Simplest way is to use a digital frequency divider, and switch between two different division ratios.
It really depends on the operating frequency and how far you wish to shift the frequency.