~Adopting optimized antenna layout design technology helps to shorten the development cycle~

Rohm (headquartered in Kyoto, Japan), a world-renowned semiconductor manufacturer, has developed a set of small wireless charging modules “bp3621 (transmitter module)” and “bp3622 (receiver module)” integrating antenna and circuit board. With this set of modules, the wireless charging function of small devices and computer peripherals such as smart tags and smart cards can be easily realized.

In recent years, in many application fields such as smart phones and smart watches, the wireless power supply function that can cancel the charging port and improve the waterproof and dustproof performance is being accelerated. However, the frequency of the existing wireless power supply standards is low, and the miniaturization of the antenna is limited in order to meet the standards. Therefore, the industry has higher and higher expectations for the standards and methods better used for small equipment. In addition, since the power supply efficiency of the wireless power supply function will change due to the antenna shape, size and distance, the wireless power supply function can only be installed after repeated trial production, adjustment and evaluation on the whole electronic equipment. For antenna design and layout design, the heavy development burden has always been a great 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 ~ 30mm square. It uses 13.56MHz high frequency band and adopts optimized antenna (coil) and layout design technology, which can provide power supply up to 200MW. It is very suitable for building a small wireless power supply system. It is not only convenient to install in small and thin equipment that is difficult to realize wireless power supply in the past, but also improves the flexibility of shell design by adopting the circuit board structure with full flat back. In addition, by using the transmitter module and the receiver module in pairs, the development time required for trial production, adjustment and evaluation to optimize the power supply efficiency can be shortened. In addition, the built-in antenna also supports bidirectional data communication and NFC forum type3 tag * 1 communication, which will help to expand the communication function 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 range of applications.

  

< new product features >

1. The integrated module of antenna and circuit board can greatly shorten the development cycle and easily realize the wireless power supply function

The new product is an integrated module of antenna and circuit board, which adopts Rohm’s own antenna design technology based on Simulation and circuit board layout design technology that can reduce wiring loss. By using the transmitter module and the receiver module in pairs, the power supply of up to 200MW can be realized. Compared with the case where the antenna and control circuit are configured separately, the feed characteristics can be guaranteed, so the product evaluation can be carried out without antenna design, layout design and feed characteristic evaluation. This can significantly shorten the development cycle and the design burden of circuit board modification, and can easily realize the wireless power supply function.

2. The miniaturization of the module is realized by using 13.56MHz high frequency band, which helps to improve the flexibility of shell design

The new product adopts the magnetic resonance mode * 2 in the high frequency band of 13.56MHz, and the antenna is smaller. It is suitable for small devices such as smart tags and computer peripherals such as mice. The new product is a small module integrating antenna, matching circuit and wireless charging IC, which is difficult to realize by the existing wireless power supply standard. In addition, as a wireless power supply product, it can not only eliminate the charging port and improve the waterproof and dustproof performance, but also make it easier to paste on the shell by adopting the circuit board structure with full flat back, which helps to simplify the shell structure and improve the design flexibility.

3. The antenna with built-in module helps to 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, the antenna with built-in module can support both power supply and communication functions at the same time. It can carry out two-way data communication (the 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 safe data transmission and rewriting of sensor data, device information and authentication information, firmware download, transmission of battery output voltage, etc.

< product lineup >

< public technical support information >

On Rohm’s official website, the following data required to build wireless power supply function are provided:

◇ technical specification ◇ Application Guide

< application example >

Small devices such as smart tags, smart cards and ID cards,

Computer peripherals such as mouse and remote control are small equipment used in the field of medical care

< explanation of terms >

*1) NFC Forum Type3 Tag:

NFC (near field communication) is a short-range communication technology that uses 13.56MHz frequency to communicate in a short distance. Its specifications are defined by NFC forum. Type 3 is one of the label standards.

*2) Magnetic resonance mode:

The utility model relates to a wireless charging mode that makes an antenna (coil) for power transceiver enter a resonant state to transmit magnetic field vibration and make current flow.

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