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Newsletter "SEI NEWS" 2014

Home > Company Information > SEI WORLD > Back number > Vol.446

[Newsletter "SEI WORLD" Vol.446]

Sumitomo Electric Develops Industry’s First Ultra-Compact and Low-Profile Charging Power Transmitter Module

Sumitomo Electric Industries, Ltd. has developed an ultra-compact and low-profile wireless charging module (hereafter, “wireless charging module”) that can supply power to electronic devices, including wearable devices, without requiring power cables. The sample product was shipped from August 2014, and full-scale shipments started in October.


What makes Sumitomo Electric’s wireless charging module different?

A wireless charging module is composed of a control board and antenna. Conventional modules use a coil as an antenna but the bulk of the coil made the module difficult to be mounted within today's increasingly smaller electronic devices.

Sumitomo Electric successfully replaced this solid coil with a flexible printed circuit (FPC) utilizing the company’s exclusive “3D wiring technology” and developed the industry’s first wireless power module equipped with an FPC.

Our new wireless power module boasts a transmission antenna with dimensions of 10 mm x 30 mm and 0.25 mm in profile, which achieved an 84% reduction in size and a 75% reduction in thickness compared with the conventional standard model.


Products that can utilize the wireless charging module

Sumitomo Electric’s wireless charging module holds promise for a wide range of applications in electronic devices to be further downsized and made lighter in weight. Such devices include water- and dust-proof wearable devices, as well as healthcare-related and industrial devices that require wireless functionality.


Advantages of Sumitomo Electric’s wireless charging module

1.Ultra-compact and low-profile antenna

Antenna component made with our extra-pliant FPC

Replacing the conventional coil used in an antenna with an FPC enabled the module to achieve industry’s top compactness and slimness.

2.Flexible Installation

FPCs can be used as both receiving and transmitting antennas. The pliability of the FPC antennas enables the module to be mounted in a U-shaped or other bent space, in which a conventional module with a coil antenna could not be used.

3.Charging control function

Sumitomo Electric’s wireless charging module uses an electromagnetic induction power supply.*1 Misalignments in electromagnetic induction devices lower the transmission efficiency and can cause overheating. As a countermeasure, Sumitomo Electric installed a power supply control function linked to a temperature monitor and automatically stops power transmission in the event of an abnormal temperature rise.

4.Available as a set of transmitting and receiving modules

Sumitomo Electric manages the entire process?from design of the module to its production. Device downsizing requires sophisticated design considering the balance between transmission and reception modules. We offer a set of a transmitting module and receiving module that satisfy this requirement.

Wireless charging module (Top: transmitter, Bottom: receptor)

*1Electromagnetic induction is a type of wireless power transmission, to transfer electrical energy from the supply side through the air to a receiving device, thereby induces magnetic flux and makes current flow.

■Reference specification

The following table shows the specification of the module. The current-carrying capacity, antenna module size, and design can be customized to the client’s needs.

Item Specification
Transmission Input voltage DC 5V
Input current Max.400mA
Reference value based on the following dimensions
Dimension Antenna 30 (W) x 10 (H) x 0.25 (T) mm
Excluding projections
Control Unit 50 (W) x 32 (H) x 0.25 (T) mm
Excluding projections
Reception Input voltage DC 5V
Input current Max.170mA
Reference value based on the following dimensions
Dimension Antenna 30 (W) x 10 (H) x 0.25 (T) mm
Excluding projections
Control Unit 12.5 (W) x 10 (H) x 0.25 (T) mm
Excluding projections

Sumitomo Electric continues to improve the transmission efficiency and increase the product lineups. We also plan to develop a wireless power module using magnetic resonance.*2

*2 Magnetic field resonance method:
Electricity is transmitted from the transmission side to the reception side based on the phenomenon where the vibration of magnetic field occurs due to the current flow on the transmission side and is transmitted to the resonance circuit on the receiving side that resonates with the same frequency. This method is attracting attention as a way to send electricity over longer distances than the electromagnetic inductive method.

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