The Working Principle of Wireless Charging Coils

The Working Principle of Wireless Charging Coils

The business opportunities of wireless charging coil modules are becoming prominent. Benefiting from the rapid development of the wireless charging market, the demand for transmitter (Tx) and receiver (Rx) coil modules has also surged significantly, driving the soaring global shipment volume of coil modules. Meanwhile, it has attracted domestic and foreign coil manufacturers to enter the market one after another, intensifying the fierce competition in the coil module market. Golden Eagle Coil has been producing wireless charging coils since 2012, and its shipment volume has exceeded 80,000K so far, enjoying a great reputation in the industry.

With more and more high-end smartphones supporting wireless charging technology, the demand for coil modules from mobile phone and charging pad equipment manufacturers is increasing day by day. In addition, with the introduction of medium-power wireless charging products in recent years, high-end coil modules with better coupling efficiency have become the new favorite in the market, expanding the market scale of wireless charging coils.

The coil module is composed of a magnetic shielding sheet and a copper coil, accounting for nearly 40% of the cost of the wireless charging module. Among them, the function of the magnetic shielding sheet is to prevent electromagnetic interference from affecting the mobile communication chip, while the coil is responsible for generating or receiving power energy. Both play a pivotal role in the wireless charging module, and the quality directly affects the efficiency of wireless charging.

At present, the products with large shipments of Golden Eagle Coil are mainly single-coil modules, whose application markets cover all current wireless charging products. Followed by multi-coil modules with a wider charging range, but the cost of multi-coil modules is 1.5 times that of single-coil modules, so this solution is only adopted in mid-to-high-end devices.

In the future, if coil manufacturers want to win in the market, they must continuously reduce the cost of magnetic shielding sheets through new processes, further reduce the width of the coil, and adjust the coil coupling efficiency to the best, so as to have the opportunity to continue to make efforts in the wireless charging coil market.