Murata has developed wireless battery charging technology using "direct current resonance". Murata explains the direct current resonance method is a new technology that converts direct current electric energy into electromagnetic field energy and uses a newly discovered physical phenomenon called an electromagnetic resonance field to transmit power. The advantages of direct current resonance includes higher conversion efficiency, reduces the number of times power is converted in the power transmission system.
Murata says the direct current resonance method is an amalgamation of several technologies that Murata has fostered over the years, including power storage device technology, wireless transmission technology, power module technology to enhance power conversion efficiency, and EMI technology. Compared to the magnetic resonance method, DC Resonance method's configuration is simpler, devices can be made smaller and lighter and no heavy magnetic material (iron) and coils (copper) are required.
Murata said its objective is to get the technology into use in fields where a wireless arrangement is of high value. These are not limited to supplying power to such mobile devices as smartphones and tablets. They could also include small battery-operated electronic devices and communications cards. Murata to develop the technology primarily for applications requiring relatively small amounts of power. For applications requiring relatively large amounts of power, such as electric vehicle recharging, Murata said it will also consider the use of arrangements like open innovation as well as technical support and licensing. Murata has filed for 12 patents, including the basic patent on this technology.