At this stage four mainstream wireless charging technology As charging power increases and speeds up, handset brand makers have introduced mobile phones equipped with wireless charging capabilities. In the recent past, the most serious news in this field was that Apple i8 would introduce wireless charging. With the endless stream of such information, the wireless charging market is expected to continue to heat up. According to market research firm IHS estimates, by 2025, total wireless receiver and sending end equipment shipments will reach 2.8 billion units, an alarming number. Back tracking the history of wireless charging technology, after some integration, the current wireless charging technology mainly by the AirFuel Alliance and wireless charging Union (WPC) are dominated by the two camps, using these two camps new version of the wireless charging specifications of the products are commercially available Production. It is worth mentioning that, due to the magnetic resonance (Magnetic Resonance; MR) and magnetic induction (MI) technology has its own good, so both camps have introduced dual-mode technology. Mainly wireless development of wireless charging In terms of the development of wireless charging technology, in addition to the above magnetic induction and magnetic resonance technology for transmitting electric power by using a magnetic field, relatively mature radio wave technology is developed. Due to the adoption of the Apple Watch, the electric field-coupled wireless charging technology also ranks among the For the current stage of the mainstream wireless charging technology. Also noteworthy is the recent rise of WattUp, a radio charging technology powered by a partnership between Dialog and Energous. Let us learn more about these wireless charging technologies below. Magnetic field transfer using magnetic induction & magnetic resonance dual mode First of all, magnetic induction technology can be said to be adopted earlier wireless charging technology. This technology uses magnetic induction to transmit power wirelessly, primarily through inductive coupling between the two coils. The alternating current in the sending coil forms a oscillating magnetic field, and the receiving coil in the sensing range of the magnetic field is electromagnetically induced to generate an induced current. However, it is unlikely that any of the charging coils will have the same properties due to inductance, compensation architecture, and different mutual inductances between different coils, so between charging pad devices of two different manufacturers Need a good fit. Overall, the advantages of magnetic induction wireless charging technology is low cost, the disadvantage is that the receiving end and sending end of the coil to be aligned. The same use of magnetic field transmission of electricity, the use of magnetic resonance mode for wireless charging, there will be no coil matching problem. Magnetic resonance wireless charging is the use of resonant devices, such as inductors and capacitors, so that the transmitter and receiver to achieve a specific frequency, and then generate magnetic resonance and energy transfer. The advantage of high transmission efficiency, easy to charge one at a time, but the disadvantage is that the magnetic resonance circuit is very complicated, costly, frequency adjustment is not easy, the resonance is not easy to maintain, and the transmission efficiency is easily affected by the resonant frequency. Electric Wave and Electric Field Coupling Pursuit of Positional Freedom As for the radio wave charging technology, which is relatively mature technology, mainly composed of a microwave transmitting device and a microwave receiving device, which can capture the rebound from the wall of the radio wave energy, with the load to make adjustments Maintain a stable DC voltage. Then talked about Japan's Murata push the electric field coupling wireless charging technology. In the CEATEC Japan 2010 comprehensive electronics exhibition, Murata's Bike Robot Type ECO is equipped with this wireless charging technology. The so-called electric field coupled wireless charging technology, the use of the vertical arrangement of two asymmetric dipole, the dipole by the power supply section and the receiving part of the activated carbon electrode and ground electrode composition, through these two Asymmetric dipole electric field coupling generated by the induced electric field to power. With this structure, the electric field coupled wireless power supply with high position freedom and high transmission efficiency can be realized. In addition, it is worth mentioning that, this technology for the electrode shape, material limitations less, and the electrode can be thin. This is because no electric current passes through the bonding portion of the electric field, so it is not necessary to use good conductors such as copper and silver, and it is possible to use ITO transparent electrode or mesh electrode depending on the shape. Furthermore, the electric field combination of this technology generates very little heat. This is because the combined part of the electric field is an AC voltage charged planar conductor, through which the current is extremely small and the conductor itself does not overheat. RF wireless charger to get rid of coil demand In addition to the major wireless charging technologies described above, WattUp's RF wireless charging technology, which Dialog and Energous have recently partnered through a strategic partnership, has also attracted the attention of the industry. This technology and the current coil-based induction or resonant wireless charging the biggest difference is that it uses radio frequency radio technology, by receiving the transmitter of the radio waves, and then convert it to power, thus eliminating the coil design, coupled with the antenna design The flexibility and small size advantages of wireless hearing aids, IoT sensors such small devices provide wireless charging, and placed high degree of freedom, can be charged at any angle. Energous divides WattUp into three types: near field, mid field and far field. The charging distances are contact (5mm), 90 cm and 450 cm respectively. In addition, depending on the distance, different power specifications are available, such as several watts, hundreds of mW, and tens of mW. The security and interference issues previously challenged by this technology, etc., seem to have somewhat lessened the concerns of outsiders when Energous announced its approval by the US FCC (Federal Communications Commission) in 2016. In addition to the well-known wireless charging technology, there are still many technologies under development, including Wi-Fi wireless charging, ultrasonic wireless charging, the use of focused light charging, and the use of infrared light charging system. Wireless charging technology is flourishing, and each has its own strength and weakness in terms of cost, scalability, power, efficiency, size and distance. It can be predicted that the market should coexist with a variety of wireless charging technologies in the future.
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