Identify QI standard: Wireless charging currently has two major international mainstream industry standards. One is wirelessCharging Alliance (WPC) QI standard, the other is AirFuelAlliance. These two standards have strict certification standards for the energy, technical parameters, compatibility, and safety of wireless charging products.
The current mainstream wireless charging power standard is 10W, which corresponds to the 5V2A charging specification. The wireless charging power supported by Apple phones is also generally in line with this standard. Some devices may support lower power, such as 5V5A, corresponding to a 5W charge rate. In contrast, the power of wired charging is usually around 18W, and wireless chargingThe speed of electricity is indeed slower.
There are four basic principles of wireless charging, respectively, electromagnetic induction charging, magnetic resonance charging, radio wave charging, electric field coupling charging, the mainstream standards on the market mainly Qi standard, PMA standard, A4WP standard, iNPOFi technology and Wi-Po technology five. Let's take a look at the principle of wireless charging.
At present, the mainstream wireless charging standards are Qi standard, PMA standard, A4WP standard, iNPOFi technology and Wi-Po technology. The Qi standard is convenient and versatileElectromagnetic induction. The charging base and the mobile phone terminal have built-in coils respectively. When the two are close, the generating coil generates a certain current in the mobile phone receiving coil based on a certain frequency of alternating current through electromagnetic induction, thereby transferring the point energy from the originating end to the receiving end, and then starting to supply power to the mobile phone from the charging seat. Magnetic resonance.
Electromagnetic induction: The fundamental principle is to use the principle of electromagnetic induction, similar to a transformer, the primary coil of a certain frequency of alternating current, through electromagnetic induction in the secondary coil to produce a certain current, thereby transferring the energy from the transmission end to the receiving end. The conversion efficiency is high, the cost is cheap, but the transmission distance is short, easily affected by placement.
Wireless charging, also known as inductive charging or non-contact inductive charging, based on the principle of electromagnetic induction, it is not necessary to transmit electricity to the device like the traditional wired charger, but the device that needs to be charged can be charged by contacting the wireless charging base.
Wireless charging system mainly adopts the principle of electromagnetic induction. Wireless charger refers to the charger that does not need to be connected to the terminal device that needs to be charged without the traditional charging power cord, using the latest wireless charging technology, by using the magnetic field generated between the coils, the magic transmission of electrical energy, inductive coupling technology will beBecome a bridge connecting charging base stations and devices.
The principle of wireless charging is that through near-field induction, the wireless charging device conducts energy to the charging terminal device, and the terminal device converts the received energy into electrical energy and stores it in the battery of the device. The principle of energy conduction is inductive coupling, which ensures that there is no exposed conductive interface. It can not only eliminate the messy transmission line between the equipment, but also for electric toothbrushes and other frequent contact with liquidsElectronic devices with conductive media are also safer.
The popularity and application of wireless charging technology Wireless charging with its convenient and environmental characteristics has gradually become a new trend of mobile phone charging. Through the principle of electromagnetic induction, such as the Qi standard and the PMA standard, the phone can automatically receive energy without physical contact with the charging line.
In addition, with the development of wireless charging technology, some wireless charging bases similar to charging bowls have begun to appear. This year's Apple autumn conference PPT AirPower is a similar device, it can simultaneously give the iPhone, Apple Watch, Air Pods and other devices are charged, and the convenience rises sharply. In addition, if wireless charging technology can be popularized, the charging experience in public places will be greatly improved in the future.
Wireless charging technology has not been widely popular reasons: the number of terminals is less two years ago, Nokia Lumia 920 built-in Qi wireless charging technology, and randomly equipped with wireless charging board, but no other manufacturers followed up. Although some third-party manufacturers have also launched wireless charging accessories, but need to install a special case, also not compatible with other digitalThe equipment is inconvenient to use.
The only way to popularize: common standards and mobile phone manufacturers support the formation of common standards is undoubtedly long and tedious, but it is the only way for wireless charging technology. Most importantly, they need the backing of a mobile phone giant such as Apple or Samsung to become widely available. Imagine if Apple's iPhone line started to support some kind of standard wireless charging technology, popularization obviously is not far away.
1The principle of wireless charging: electromagnetic induction. The charging base and the mobile phone terminal have built-in coils respectively. When the two are close, the generating coil generates a certain current in the mobile phone receiving coil based on a certain frequency of alternating current through electromagnetic induction, thereby transferring the point energy from the originating end to the receiving end, and then starting to supply power to the mobile phone from the charging seat. Magnetic resonance.
2, wireless charging system mainly uses the principle of electromagnetic induction. Wireless charger refers to the charger that does not need to be connected to the terminal device that needs to be charged without the traditional charging power cord, using the latest wireless charging technology, by using the magnetic field generated between the coils, magical transmissionTransmission energy, inductive coupling technology will become a bridge connecting charging base stations and equipment.
3, the principle of mobile phone wireless charging is the use of electromagnetic induction technology, the electric energy through the magnetic field in the air to the mobile phone, so as to achieve the charging of the mobile phone. Specifically, wireless charging devices mainly include two parts: transmitter and receiver. The transmitter generates a high-frequency alternating magnetic field through a built-in coil, and the coil inside the receiver receives the magnetic field energy and converts it into electricity, thus charging the phone.