The qi protocol is a wireless charging standard introduced by the Wireless Charging Alliance (wpc).
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Similar to Qualcomm's qc, Qualcomm's qc protocol is through the mobile phone to listen to the data line in the data corner to apply a certain voltage to tell the charger, I need what protocol, qi protocol is the same, when your mobile phone is put on, the charger transmitter and mobile phone receiver to establish a connection, and then will transmit a specific frequency to the phone, the phone will feed back to the charger, I need whatever power I need, and the charger will emit corresponding electromagnetic waves to charge the phone.