Galaxy S6 edge+: Why is there noise when using wireless charger pad?

Last Update date : Oct 28. 2020

While charging the device, the fan inside the wireless charger will activate to cool the charger. 

On this process, you may hear a slight sound however this is intended concept to prevent charger overheating and normal operation. 
You can reduce noise by deactivating the fan. 
To deactivate, open the Apps screen, tap Settings → Accessory, and then tap the Fast wireless charging switch to deactivate it. Please note turning off the fan will result in a slower charging speed.

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