The principle of wireless charging technology:
Wireless charging (Wirelesscharge), also known as induction charging and non-contact induction charging, is a device that uses near-field induction, that is, inductive coupling, to transfer energy from power supply equipment (charger) to electricity. The device uses received energy to charge batteries and at the same time to operate itself. Because the energy is transmitted by inductance coupling between charger and electric device, there is no wire connection between them, so both charger and electric device can be exposed without conductive contacts.
Wireless charging technology began to enter the consumer's attention in 2010. In 2011, many Japanese manufacturers took the lead in displaying their commercial devices related to wireless charging technology. In the second half of 2011, some consumer electronics manufacturers began to use it for charging applications of portable devices such as smartphones, and gradually began to enter the public world. According to a report by MarketsandMarkets, the global wireless charging market will experience blowout growth in the next five years. By 2017, it will form a market of more than $7 billion, compared with only $457 million in 2011, with a compound annual growth rate of 57.6%.
Future wireless charging technology will allow all mobile devices to be embedded in built-in receivers and transmitters, which are deployed everywhere in public areas, such as cafes, hotels, airports, fast food restaurants, etc. Consumer electronic devices are obvious target markets, but medical and industrial portable devices are also application segments that can benefit from radio power. They can achieve waterproof enclosures and reduce charging ports. These charging ports are often used and can cause unnecessary failures due to repeated insertion of charging wires.
Advantages and disadvantages of wireless charging technology:
Safety: No power-on contact design, 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 mechanical wear and tear when connecting and separating, and the loss caused by jumping fire.
In order to make medical implant device safer, it is possible to charge medical device implanted in human body without damaging body tissues without needing wires to penetrate skin and other autologous tissues, so as to avoid the risk of infection.
Convenience: When charging, it does not need to be connected by wire, just put it near the charger. Technically, a charger can supply electricity to multiple electrical devices. In the case of multiple electrical devices, it can save the trouble of multiple chargers, not occupying multiple power sockets, and not winding multiple wires.
Low efficiency: Energy storage efficiency is less than real contact.
Charging speed is slow: because of low efficiency, charging speed is slow under the same input power.
High Cost: In charger, there is need for electronic circuit to drive coil, and in electrical device, there is need for electronic device to exchange power, both need coil, so the cost is higher than direct contact.
Can't charge when moving: This problem only happens on mobile devices. For example, whisker planer can't move the charger when charging. If the batteries in the whisker planer are completely exhausted, then the whisker planer can't be used. Instead, the traditional design connected by wire can continue to use when the charger is connected by wire.
Low compatibility: Different brands of wireless charging devices can not be used interchangeably because there is no uniform standard. In recent years, Qi, an industry organization, has begun to implement standardization, and its outlook is expected to reach a unified standard.