Now that wireless charging technology has been widely used, the use of wireless charging coils has gradually freed people from the troubles caused by charging cables. With the further popularization of this technology, the wireless charging function in public places has also developed, but wireless charging What exactly is a charging coil?
wireless charging coilThe wireless transmitting coil is used to transmit electrical energy in the electric and magnetic fields between the charger and the device, and the receiving coil and the capacitor form resonance between the charger and the device. Wireless charging is a relatively novel charging method, and its principle is actually very simple. It is to separate the ordinary transmitting coil and the receiving coil secondary to achieve the purpose of wireless.
The development of wireless charging coils can generally be divided into 4 stages: in 1890, physicist and electrical engineer Nikola Tesla had already done wireless power transmission experiments and realized AC power generation; in 2007, the research of MIT The team completed the experiment that can achieve the longest transmission distance of 2.7m; in 2014, Dell joined the A4WP camp, representing the advent of the wireless charging era for laptops; in October 2017, iphone joined the wireless charging family, and the wireless era on the mobile phone was officially launched. advent.
The loss of the wireless charging coil is lower than that of the wired charging technology. The wireless charging coil system mainly adopts the principle of electromagnetic induction, and the energy is coupled through the coil to realize the transmission of energy. The conversion rate of the wireless charging coil is several percentage points higher than that of the wired charging coil. .High conversion is also a key factor for the application of wireless chargers around the world. Through the coupling energy of the wireless charging transmitting coil and the wireless charging receiving coil, the current output by the transmitting coil is converted into direct current by the receiving conversion circuit to charge the battery.
Wireless charging coils are divided into low-power wireless charging and high-power wireless charging. What is the difference? In fact, it is well understood that low-power wireless charging often uses electromagnetic induction, such as wireless charging coils used on mobile phones; while high-power wireless charging coils It is widely used in electric vehicles, large power supply equipment, etc.