Electromagnetic induction wireless charging, when the current of the power supply passes through the coil (the sending coil of the wireless charger), it will generate a magnetic field, and other unpowered coils (the receiving coil of the mobile phone) will generate current to charge the mobile phone when they are close to the magnetic field.
1. Safety advantages of wireless charging: no live contact design, which can avoid the danger of electric shock. Durable: power transmission components are not exposed, so they will not be eroded by moisture and oxygen in the air; There is no contact, so there will be no loss caused by mechanical wear and flashover when connecting and separating. Convenient: When charging, you don't need to connect with wires, just put it near the charger, you don't need to occupy multiple power outlets, and you don't need the trouble of winding multiple wires.
2. Disadvantages of wireless charging The efficiency is slightly lower: there are transformers in general chargers, but the structure of the transformer composed of the transmitting coil and the receiving coil of wireless charging is limited, and the energy transmission efficiency is slightly lower than that of general chargers in theory. Slow charging speed: At present, most receiving devices such as mobile phones limit the input power, so the charging speed is slow. High cost: the charger needs electronic circuit to drive the coil, and the power receiving device needs electronic devices to convert power. Both of them need coils and high-frequency filter circuits to meet electromagnetic compatibility, so the cost is higher than that of direct charging.