Voltage problem

R

rakibulraju

Member

• Sep 24, 2013

• #1

I am working with wireless electricity transfer.I am getting open circuit output voltage about 11v dc after converting it?but when I give this to a load like a led the voltage is dropping drastically to 2v and current is only 50-60ma?what is the problem that voltage is dropping drastically and current is also low? I need to charge a mobile with this but it is not working?

 

MikeMl

Well-Known Member

Most Helpful Member

• Sep 24, 2013

• #2

You just learned why coupled coils are wound on ferrites or iron; not air.

 

ronv

Well-Known Member

Most Helpful Member

• Sep 24, 2013

• #3

Make sure your receive coil is adjusted to be resonant at the same frequency as the transmit coil.

 

Willen

Well-Known Member

• Sep 24, 2013

• #4

May be current is too weak so voltage and current drops after a load. Heard that wireless electricity transmission has no more effiency.

And may be such wireless electricity transmitter device will not transmit enough current to charge cell phone.

 

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M

mickyy20

New Member

• Sep 24, 2013

• #5

first check voltage and current across with load.
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**broken link removed**

 

WTP Pepper

Active Member

• Sep 24, 2013

• #6

Google Thevenin's equivalent circuit. The internal impedance of the circuit is made up of coupling efficiency (among other things) which in air and at low frequency can be quite high.
Even at higher frequencies, if the load current is sufficiently high enough, the losses across this air gap can still be high.