NGK INSULATORS, LTD. (hereinafter, “NGK”), TOREX SEMICONDUCTOR LTD. (hereinafter, "TOREX") and Ossia Inc. (hereinafter "Ossia") have started working together to spread the use of wireless power transmission/transfer (WPT) systems. The companies have developed a WPT power receiver development kit using a combination of NGK’s lithium-ion rechargeable batteries EnerCera®, TOREX’s low-current-consumption power supply ICs and Ossia’s WPT technologies.

Adoption of sensor networks using many IoT devices has been increasing in recent years. Conventionally, powering IoT devices involved power cables and primary batteries (disposable batteries), so cumbersome wiring and replacing batteries had been an issue. Using radio frequency (RF) to transfer power over about 10 meters, WPT is attracting attention as a power supply technology that promotes the realization and widespread use of maintenance-free IoT devices as it enables power supply to places where wiring presents difficulties and eliminates the need to replace batteries. In particular, Ossia’s Cota® WPT using the 5.8 GHz band is expected to be used in a wide range of applications, including power supplies for sensors installed in places such as enterprise environments, retail, factories and warehouses. At the higher frequency of 5.8GHz, it enables smaller receivers and more precise control of power supply.

NGK, TOPEX and Ossia are working together to spread the use of 5.8 GHz band WPT. The WPT power receiver development kit comprises the Ossia Antenna that extracts radio frequency as power, EnerCera batteries that store the power and a power supply IC that stably supplies the stored power at an optimal voltage to an MCU* or sensor. Connecting this kit to any MCU or sensor enables developing a device with WPT as a power source.

* Microcontroller unit (MCU): A semiconductor chip used for such purposes as controlling electronic device operations.

- Iwao Ohwada, Vice President, General Manager, Advanced Device Components Div., Electronics Business Group, NGK INSULATORS, LTD. : With features such as low resistance, high capacity, and long life, EnerCera batteries are an ideal energy storage device for WPT because it can efficiently charge the power transmitted via WPT and store it for long periods of time and provide high enough output to power MCUs and sensors. Combined with the power supply IC and Ossia’s WPT technology, we will promote the development and popularization of maintenance-free IoT devices powered by WPT using the 5.8 GHz band.

- Tomoharu Yamamoto, General Manager, Product Planning & Overseas Sales Management HQs, TOREX SEMICONDUCTOR LTD. : TOREX’s power supply ICs realize low consumption, high efficiency, and low noise, enabling EnerCera to be charged with zero waste by the power transferred via WPT. The micro DCDC series, integrating a coil and control IC, facilitates stable supply of power stored in EnerCera at an optimal voltage to MCUs or sensors, helping to make devices even more compact.

- Jennifer Grenz, Chief Revenue Officer, Ossia Inc. : Ossia’s Cota Real Wireless Power is uniquely suited for multiple battery applications. Charging batteries with wireless power changes the way companies can design products without needing to have easy access for frequent battery replacement. It is also an environmental benefit to reduce disposable battery waste. One Cota transmitter can power multiple batteries simultaneously, even while in motion, allowing for product innovation.

[EnerCera batteries]

EnerCera is an ultra-small/ultra-thin lithium-ion rechargeable battery using NGK's original crystal-oriented ceramic plate as electrodes. EnerCera’s unique battery structure (semi-solid-state battery) where small amounts of electrolytic solution are infused into multi-layered ceramic battery materials, enabling it to achieve features required to power IoT devices but which had been difficult to incorporate in existing lithium-ion rechargeable batteries, such as being ultra-small/ultra-thin, high capacity, high output, high-heat-resistance and long life. EnerCera batteries’ innovation and practicality have been highly commended, and it has received many awards as an energy storage device promoting the full-scale popularization of IoT modules.

EnerCera Battery Series EnerCera Coin (above four products) and EnerCera Pouch (five products below)

■ EnerCera Product Site：https://www.ngk-insulators.com/en/product/enercera.html
■ EnerCera Special Site：https://enercera.ngk-insulators.com/en/

["micro DC/DC" XCL Series]

"micro DC/DC" The XCL series is ultra-small DC/DC converters that integrate a coil and a control IC using Torex's unique technology. Our unbending dedication as a power IC manufacturer has maximized DC/DC converter performance, and we have realized a product that simultaneously achieves space-saving, high efficiency, low noise, high heat dissipation, and low cost.

■ "micro DC/DC" XCL Series Product Site：https://www.torexsemi.com/technical-support/application-note/xcl-intro/

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