How does a wireless charge work?

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How does a wireless charge work?

发布时间:7/1/2020

Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. Wireless charging of mobile phones mostly USES the principle of electromagnetic induction.
Electromagnetic induction wireless charging. When the current of the power supply passes through the coil (the transmitting coil of the wireless charger), a magnetic field will be generated. When other unenergized coils (the receiving coil of the mobile phone) are close to the magnetic field, a current will be generated to charge the mobile phone.
Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. Wireless charging of mobile phones mostly USES the principle of electromagnetic induction.
Electromagnetic induction wireless charging. When the current of the power supply passes through the coil (the transmitting coil of the wireless charger), a magnetic field will be generated. When other unenergized coils (the receiving coil of the mobile phone) are close to the magnetic field, a current will be generated to charge the mobile phone.
The advantages of wireless charging
Safety: No electrified contact design, can avoid the danger of electric shock.
Durable: power transmission elements are not exposed, so will not be air moisture, oxygen and other erosion;
There is no contact, so there will be no mechanical wear and loss caused by jumping fire when connecting and separating.
Convenience: When charging, there is no need to connect wire, just put it near the charger. There is no need to occupy multiple power outlets, and there is no trouble of multiple wires intertwining.
The downside of wireless charging
Slightly less efficient: General chargers also have transformers, but wireless charging transformer consisting of transmitting and receiving coils is structurally limited, the energy transfer efficiency will be slightly lower in theory than general chargers.
Slow charging speed: Due to current receiving devices such as mobile phones, most of which limit the input power, charging speed is slow.
High cost: Electrical circuits for pushing coils are required in chargers and electrical devices for power conversion, both of which require coils and high-frequency filter circuits for ELECTROMAGNETIC compatibility, so the cost is higher than direct charging.