need
Of course, the charger needs to be powered on, and the phone that needs to be charged can be charged wirelessly, without the need for a wire connection.
Yes, plug the charger into the power supply can be used, if it is a wireless charging treasure then know that he is automatic lithium battery, you can take the charging treasure to other places after full, so the wireless charger just needs your phone on the above to charge, it still needs to be powered up.
Wireless charging also needs to be plugged in, it is mainly to carry out an induction charging with one of our panels, because we put our power supply has been plugged into our mobile phone, directly put the mobile phone on it can be directly charged, but in fact, we still need to be connected to the power supply, and then be able to charge normally.
For the device being charged, it is not required, but for the wireless charger, it is required.