Wireless Charging with Capacitive Coupling Wireless Power TransmissionJanuary 2012 – Murata Electronics North America introduced its new wireless power transmission system at the 2012 Consumer Electronics Show. This module makes capacitive wireless charging systems a reality. The higher power capability of the LXWS series transmitter and receiver enable wireless charging systems for tablet PCs, mobile phones, laptops, music players, and a host of other consumer electronics. As these products require increased battery consumption to achieve higher levels of functionality, the challenge arises to ready them with the ability to charge quickly and wirelessly. To resolve that issue, Murata applied its circuit design and module manufacturing technologies to develop a capacitive coupling wireless charging module that is capable of charging at 10W, includes a high level of positioning freedom, and integrates removal and error detection to ensure optimal system operation.

Advantages of Capacitive Coupling Wireless Power Transmission

For the design engineer, the incorporation of a very thin electrode (less than 0.1mm) with a miniaturized antenna structure decreases the thickness of the structure. Further, the LXWS series transmitter and receiver generates limited heat in the wireless power transmission area, effectively suppresses noise, and is easy to integrate into almost any mobile device. For the consumer, these benefits translate to being able to charge several different products on the same system at the same time without the need for a cable connection.

Inductive Vs Capacitive Coupling for Wireless Power Transmission

As background, wireless charging is accomplished primarily through the use of either inductive or capacitive coupling. In the capacitive coupling wireless charging, coils are replaced with transmitter and receiver simple electrodes. With this and the technological advantages mentioned, greater cost savings are realized. Moreover, Murata has incorporated more than 30 of its proprietary patents into this product line.

Samples of both the LXWS series’ transmitter and receiver are available upon request. For pricing information, please contact Murata through http://www.murata-northamerica.com. Production volumes will be available beginning in the next three to six months.