“In recent years, the adoption of wireless power supply, which can eliminate the charging port and improve water and dust resistance, has been accelerated in numerous application fields such as smartphones and smart watches. However, the lower frequencies of existing wireless power standards and the constraints on miniaturization of antennas to comply with the standards have resulted in growing expectations for standards and approaches that are better common to small devices.
ROHM has developed wireless charging modules “BP3621” and “BP3622” that can easily realize wireless power supply of small and thin devices
~Using the optimized antenna layout design technology, it helps to shorten the development cycle~
The world-renowned semiconductor manufacturer ROHM (headquartered in Kyoto, Japan) has developed a set of small wireless charging modules “BP3621 (transmitter module)” and “BP3622 (receiver module)” integrating antenna and circuit board. Wireless charging of small devices such as smart tags and smart cards and computer peripherals can be easily implemented.
In recent years, the adoption of wireless power supply, which can eliminate the charging port and improve water and dust resistance, has been accelerated in numerous application fields such as smartphones and smart watches. However, the lower frequencies of existing wireless power standards and the constraints on miniaturization of antennas to comply with the standards have resulted in growing expectations for standards and approaches that are better common to small devices. In addition, since the power supply efficiency of the wireless power supply function will change due to the shape, size and distance of the antenna, it is necessary to repeatedly conduct trial production, adjustment, and evaluation on the entire Electronic device before installing the wireless power supply function. In terms of layout design, the heavy development burden has always been a big problem. In this context, ROHM has developed a 13.56MHz wireless charging module, which can easily realize the wireless power supply function for small and thin devices.
The new product is a small module with a size of about 20mm to 30mm square. It uses a 13.56MHz high frequency band and adopts an optimized antenna (coil) and layout design technology, which can provide up to 200mW of power supply, which is very suitable for building a small wireless power supply system. Not only is it easy to install in small and thin devices that have been difficult to achieve wireless power supply in the past, but also the flexibility of housing design is improved by adopting a circuit board structure with a fully flat back. In addition, by using transmitter modules and receiver modules in pairs, the development time required for trial production, adjustment, evaluation, etc. required to optimize power supply efficiency can be shortened. Not only that, the built-in antenna also supports bidirectional data communication and NFC Forum Type3 Tag*1 communication, which will help expand the communication capabilities of the application.
The new product has been put into mass production in October 2021 and is expected to start online sales in the near future. The production base is ROHM Apollo Co., Ltd. (Fukuoka, Japan).
In the future, ROHM plans to continue to expand the product lineup of small and high-power modules to further expand the applicable range.
＜New product features＞
1.Antenna and circuit board integrated module, which can greatly shorten the development cycle and easily realize the wireless power supply function
The new product is an integrated antenna and circuit board module that uses ROHM’s own simulation-based antenna design technology and circuit board layout design technology that reduces wiring losses. By using transmitter modules and receiver modules in pairs, a power supply of up to 200mW can be achieved. Compared with the case where the antenna and control circuit are separately configured, the feeding characteristics can be guaranteed, so product evaluation can be performed without the need for antenna design, layout design, and feeding characteristics evaluation. This can significantly reduce the development cycle and the design burden of board modifications, and enables easy wireless power delivery.
2.The use of 13.56MHz high frequency band realizes the miniaturization of the module, which helps to improve the flexibility of housing design
The new product adopts the 13.56MHz high-frequency magnetic field resonance method*2, and the antenna volume is smaller, which is suitable for small devices such as smart labels and computer peripherals such as mice. The new product is a small module that integrates an antenna, a matching circuit and a wireless charging IC, which is difficult to achieve with existing wireless power supply standards. In addition, as a wireless power supply product, not only can the charging port be eliminated, and the waterproof and dustproof performance can be improved, but also by adopting a fully flat back circuit board structure, it is easier to stick to the case, which helps to simplify the case structure and improve the design. flexibility.
3.Antenna with built-in module to help expand the data communication function of application products
Since the new product uses the same 13.56MHz high frequency band as the NFC communication standard, it can support both power supply and communication functions through an antenna with a built-in module. It can carry out two-way data communication (communication speed is 212kbps, up to 256 bytes) and NFC Forum Type3 Tag communication, which helps to expand the data communication functions of application products, such as data security transmission and rewriting of sensor data, device information and authentication information, Firmware download, sending of battery output voltage value, etc.
＜Disclosed technical support information＞
On ROHM’s official website, the following data required to build a wireless power supply function are provided:
◇Technical Specifications◇Application Guide
Small devices such as smart labels, smart cards and ID cards,
Computer peripherals such as mice and remote controls for small devices in healthcare
＜Explanation of terminology＞
*1) NFC Forum Type3 Tag:
NFC (Near Field Communication) is a short-range communication technology that uses a frequency of 13.56MHz to communicate within a short distance, and its specifications are defined by the NFC Forum. Type3 is one of the labeling standards.
*2) Magnetic resonance method:
A wireless charging method in which an antenna (coil) for power transmission and reception enters a resonance state to transmit magnetic field vibrations and flow current.