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NXQ1TXH5 - Detecting receiver

Question asked by Jan Buchwald on Nov 12, 2018
Latest reply on Nov 13, 2018 by JOSE ALBERTO REYES MORALES

Hi All,

 

I developed a wireless charging application with the NXQ1TXH5 and charging works. But I have problems with the device detection. It takes very long to find the right alignment of the coil, start charging works only in one position (has to be extremely precise, about 1mm). This is reproducible. 

When the charger detects the receiver coil (used smartphone for testing), I can move the smartphone up to 1cm in all directions and the charger won't stop charging. So when the connection is established, everything works fine.

 

What's the issue? Any ideas? It seems that the charger can't "find" the receiver. Used standard values for components as required in the datasheet. Coil is the WT-505090-10K2-A11-G from TDK, R8 = 47 Ohms (according to application note).

 

Best regards

Jan 

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