Brief Description Of Wireless Charger

With the continuous improvement of the requirements for power supply quality, safety, reliability, convenience, immediacy, special occasions, and special geographic environments, the contact-type power transmission method is becoming less and less able to meet actual needs.

A wireless charger is a device that uses the principle of electromagnetic induction for charging. Its principle is similar to that of a transformer. By placing a coil at the transmitting and receiving ends, the transmitting end coil sends an electromagnetic signal to the outside under the action of electric power, and the receiving end coil receives the electromagnetic signal. Signal and convert electromagnetic signal into electric current, so as to achieve the purpose of wireless charging. Wireless charging technology is a special way of power supply. It does not require a power cord, relies on electromagnetic wave propagation, and then converts electromagnetic wave energy into electrical energy, and finally realizes wireless charging.

New electronic products, especially portable electronic products such as digital cameras, mobile phones, and tablet computers, are increasingly used in people's work and life, and the matching chargers also use traditional wired chargers. However, the compatibility and versatility of wired chargers are relatively poor, and it is inconvenient for users to carry and charge. At the same time, post-disposal treatment increases environmental pollution. Therefore, it is extremely urgent to provide users with more reliable, convenient, convenient and timely charging equipment. The development of wireless technology makes it possible to transmit radio power, and the research and development of wireless chargers will also meet user requirements.

There will be three main forms of battery charging in the future: visual charging, smart charging and wireless charging. In 2016, there were only 138 members of the International Wireless Power Consortium (WPC), but this year there are more than 200 WPC technology companies, such as Apple, Samsung, HTC, Huawei, Lenovo, Xiaomi, Nokia, Sony and many other mainstream mobile phone manufacturers. Generally speaking, a Qi wireless charger has a flat surface, called a charging pad, on which mobile devices can be charged. Qi specifies three different methods for coil calibration, namely: guided positioning (magnetic attraction), free positioning (moving coil) (and free positioning (coil array), these three methods are briefly explained below.

First, guide positioning (magnetic attraction): that is, a one-to-one fixed position charging is used to guide the placed charging equipment and achieve accurate calibration. The advantage of this calibration method is simple, but it requires a series of magnets in the charging equipment The attracted material, therefore, the power loss associated with the eddy current (and thus the temperature rise) will be attracted by the magnetic attractor. Second, free positioning (with a movable primary coil): It is also a one-to-one charging device that can be positioned and charged. This method requires a mechanically movable primary coil that is tuned to couple with the position of the charging device. However, Movable mechanical parts often reduce the reliability of the system. In addition, for multiple charging devices, the motor control of the primary coil is complicated and expensive. Third, free positioning (coil array): Allow multiple devices to be charged without considering their location. Compared with the above two methods, this calibration method is based on a more expensive and more complex winding structure and control electronic elements. At the price, it provides more user-friendliness.