ROHM’s New Wireless Charger Modules

ROHM has developed compact wireless charger modules with an integrated antenna panel: BP3621 (transmitter) and BP3622 (receiver). The new modules allow wireless power supply functionality to be added to smaller devices such as tags/smart cards or PC peripherals.

Wireless power supplies are increasingly being adopted in smartphones, smartwatches and other compact devices. By utilizing wireless power technology, the devices can improve water and dust resistance by eliminating the need for peripheral contacts. However, current low-frequency standards for power transmission – along with restrictive antenna designs – limit the degree of miniaturization that can be achieved. These factors further reduce the demand for standards and methods that can be universally adopted in embedded devices. Additionally, the efficiency of power transmission can vary – depending on antenna shape, size and distance. Therefore, iteration of prototyping, adaptation and evaluation is often necessary on the system – a significant development burden for antenna design and planning.

In response, ROHM has developed 13.56MHz wireless charging modules that allow users to easily add wireless power functions to thin and compact devices. Measuring only 20 mm2 to 30 mm2 The BP3621 (transmitter) and BP3622 (receiver) include an improved antenna (coil) design. It enables the configuration of a compact wireless charging system using a frequency band of 13.56MHz to provide up to 200mW. The all-flat back panel chassis facilitates installation in thin and compact devices – contributing to greater flexibility in chassis design unlike conventional solutions. Moreover, the use of transceiver modules as a pair can greatly reduce the development load for prototyping treatment, adaptation, evaluation and other processes needed to achieve high-efficiency wireless charging. At the same time, the built-in antenna supports two-way data communication and NFC Forum Type 3 Tag operation, which broadens the application range.

Going forward, ROHM will continue to develop compact modules, with effective power conversion to 1W and also NFC-compatible to support a wide range of applications.

Feature guides

  1. Modular design with integrated antenna panel makes it easy to realize wireless charging function, which greatly reduces the development load

Rohm’s new antenna-equipped modules combine original simulation-based design technology with matching mods and an improved panel layout design to reduce wire loss. As a result, the pairing of transmission and receiver modules can provide up to 200mW of power. Unlike conventional solutions where the antenna and control circuit are configured separately, wireless charging performance is guaranteed, allowing product evaluation without the need to evaluate or design antenna characteristics or characteristics. This unit greatly reduces the development and design load required to modify the plates, making it easy to realize the wireless charging function.

2.It adopts 13.56MHz frequency band contributes to higher rating, providing greater design flexibility

Targeting embedded devices such as smart tags and PC peripherals (such as mice), these new modules use an MRI method in the 13.56MHz frequency band to reduce antenna size. This makes it possible to develop a compact module that integrates a wireless charger IC, matching circuit, and antenna that was difficult to achieve in the past. Wireless charging offers greater reliability through improved dust and water resistance by eliminating physical terminals, while a completely flat rear chassis with front-mounted components contributes to simpler housing structures and greater design flexibility.

3.Integrated antenna expands communication function

The same high-frequency band is used as the NFC communication standard, allowing the built-in antenna to transmit data and power. Both bi-directional data connections (256B max. 212 kbps) and NFC Forum Type 3 Tag are supported, allowing functions ranging from firmware downloads, secure data transfer, and rewriting sensor/device/authentication information to output voltage values. the battery.

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