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Murata develops direct current resonance- a new wireless power transmission system technology


Murata has developed a direct current resonance method as a new wireless power transmission system technology. 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 technology can enhance energy conversion efficiency because a resonance field is formed directly from the direct current power source.

It can also reduce the number of times power is converted in the power transmission system and achieve greater simplicity and power efficiency. In addition, expanding resonance fields could extend applications to a variety of usage scenarios. 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.
Major features (comparison with existing magnetic field resonance method)
1)This is a wireless power transmission system from a direct current power source Most of the power that people use is direct current (DC). Even commercial alternating current (AC) is converted to direct current, and nearly every electronic device runs on direct current voltage. Therefore converting energy from a direct current power source can enhance efficiency.
The technology directly converts between electric energy and electromagnetic field energy
2) The goal is to require only one direct power conversion when transmitting power wirelessly, as opposed to the four to six repetitions required up to now. This allows overwhelming energy savings and creates a big advantage in terms of compactness and lightness.
The technology expands the resonance field to transmit power
3)Innovations in transmitting and receiving devices and resonance devices can expand the resonance field and create new possibilities, such as supplying power to multiple loads. This should lead to technical applications and product development for various usage scenarios.

Comparison with existing methods
Configuration is simpler, devices can be made smaller and lighter, and system power efficiency can be improved as compared to the magnetic resonance method
There is a higher degree of freedom in the layout of power transition and receiving devices compared to the inductive coupling method, and no heavy magnetic material (iron) and coils (copper) are needed
Compared to the electric field coupling method, the new technology is superior when a greater transmission distance is required. No physical contact is required
A great amount of power is transmitted than with the radio wave method. This allows power transmitting and receiving devices to be smaller

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