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Wireless power transmitter with LTC4125

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Bjtpower

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Dear All

are there anyone having idea of "LTC4125"

I am developing a wireless power Transmitter.

I am basically looking for the "How to start the testing of application developed Board"

I am attaching Image in the mail also the datasheets.
http://cds.linear.com/docs/en/datasheet/4125f.pdf

Kindly guide

Thanks
Marx LTC4125_PROBLEM.PNG
 

It is just a power oscillator with an adapting output stage. What exactly are you trying to do with it?

Brian.
 

Brian:
I am looking a help for the "Just start the Circuit"

We have developed a application note of the same on the demo board for the testing but we dint know what output will come without receiver..?

What test point needs to be follow without damaging the IC.
There is no enough information on the web portals for the testing scheme.

Let me know

Thanks
Marx
 

The series 24uH inductor and 100nF cap from the transmitter, and the series 47uH inductor and 33nF cap from the receiver, resonates at the desired frequencies.
I would not expect to damage the transmitter without using the receiver resonator load, especially when this is at resonance, because at resonance actually this gives the maximum current at the transmitter side.
But to get the right information at the TX side, I would give data with and without receiver in place.
 
It won't do anything useful without a matching receiver. The design is a tunable oscillator running at approximately 100KHZ that pumps current at that frequency across Ltx. The other components are for detecting fault conditions such as the supply current being too high, frequency being too far out of range or Ltx becoming too hot.

The easiest way to test it is to connect a small flashlight lamp (use incandescent, not an LED) across a coil of wire with say 100 turns around a 40mm air core then hold it close to Ltx. I made a wild guess at the coils size but it will be close enough to see some effect. If you hold the coil close to Ltx the current drawn from the 5V supply should increase and hopefully you will see a glow in the lamp.

Brian.
 
What do you mean by "How to start the testing of application developed Board"? What characteristic do you need to measure? Ouput Power, Voltage Gain?
Another question, what sort of emitting coil are you using?
 
Hi SK

I just want to know the if i give a 4-5.5 volt to the demo board without Receiver.

then what Waveforms will come at the sw1 and sw2..??

what is exact waveforms should be??
 

Sw1 and Sw2 is an inverter, so you'll probably see an AC curve. But if there is no receiver it might not transmit anything but just pingging to check if receiver is here. Some of these devices are made for not spending power.

- - - Updated - - -

Otherwise, you can take or build a receiving coil, put a capacitor in series with a load resistor. Inductor and capacitor has to be in resonnance with transmitter. Fr=103KHz=1/(2*pi*sqrt(L*C))
 

Hi SK,

i used the Receiver of LTC4120.
now the power is transferred.
But it is transferring for 60 seconds then it make the circuit off automatically for 100 sec an then again it charge battery for 60 sec likewise cycling.

And battery Voltage is increasing from previous state to next State by some amounts.

Now i am confused that why such charge Behavior occurs..?

Thanks
Marx
 

I would start by checking the three conditions betwixt pointed you to: "...fault conditions such as the supply current being too high, frequency being too far out of range or Ltx becoming too hot. "
 

Dont know..

what is going on.?
Sometime it charge battery for high Duration and sometime not, all conditions are identical.

This is screwing..
Transmitter-LTC4125 and Receiver-LTC4120 using.
 

With the wireless Receiver, i have connected a 3.7v/450maH (LI-POLYMER) Battery.

But it charges the battery only upto 4.00 voltage and it goes to shut down mode without charging battery in cv as well Trickle charge.

Somebody help me by reading LTC4120 Datasheet.

The battery is not 100% Charged.

I am measuring Voltage on the Scope where scope DC (Maximum) measuring=4.12v and DC Mean Measuring 4.00 volt.

Kindly help
 

What voltage are you expecting it to charge the 3.7V battery to?

The final voltage is decided by the ratio of resistor values between BAT, FB and FBG. You should aim for 2.4V at FB when the battery has reached full voltage. The charge can also be stopped if the thermistor detects the battery temperature is too high so it is important to use the type recommended in the data sheet.

Brian.
 

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