What is the relation between the inductance of transmitter and receiver coil used in wireless power transfer

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newbie_hs

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As per my knowledge ,

For TX

For a transmitter coil, lower inductance is usually the best route because, it's current that needs to flow to generate an external magnetic field.

For RX
Usually want more turns on the RX coil to create sufficient dc voltage after rectification.

May I know your thoughts.
 

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FvM said:
I'd consider series resonant operation of TX coil.
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Yes , the operation of WPT is series resonant.
My question is about the inductance of TX and RX coil.
As per my understanding the inductance of TX coil should be less than RX coil.
May I know your thoughts about this
 

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TX coil inductance doesn't limit current in series resonance, only ESR does. Don't see that it should be generally lower than RX coil inductance. But you should discuss specific design parameters, frequency, power and coil geometries.
 

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