Xiaomi 9's 20W wireless charger adopts a new design, which is 100% higher than the previous generation peak charging power, up to 20W, charging the Xiaomi 9 in 90 minutes, which is faster than wired charging of many mobile phones. . A new cooling hole is added to the bottom of the charging board, and a separate silent fan and heat sink are built in. The dual cooling system can effectively reduce the temperature rise during the wireless charging process and improve the charging efficiency. The entire charging scheme has passed the safety fast charging 2.0 certification of the authoritative organization TUV Rheinland, which is safe and reliable.