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High-Power Wireless Charging: New Boards from ST

Innovation in High-Power Wireless Charging

STMicroelectronics has launched a Qi-compatible transmitter and receiver combination capable of delivering up to 50W, designed to accelerate the development of high-power wireless charging applications such as medical and industrial equipment, home appliances, and computer peripherals.

The STEVAL-WBC2TX50 transmitter board can deliver up to 50W of output power using the ST Super Charge (STSC) protocol. This proprietary protocol from ST allows for faster wireless charging compared to standard protocols used in smartphones and similar devices, enabling quicker recharging of larger batteries.

Additionally, the board supports the Qi 1.3 5W Baseline Power Profile (BPP) and 15W Extended Power Profile (EPP). The main component on the board is ST’s STWBC2-HP transmitter system-in-package, which combines an STM32G071 Arm Cortex-M0 microcontroller and an application-specific front end.

Components and Technical Capabilities

The front end provides signal conditioning and frequency control, a high-resolution PWM generator to drive the transmitter, and operates with any DC voltage from 4.1V to 24V. It also contains MOSFET gate drivers and a D+/D- interface for USB Power Delivery.

Additionally, the STWBC2-HP SiP can work with ST’s STSAFE-A110 secure element to provide Qi authentication.

The STEVAL-WLC98RX receiver board is built to handle up to 50W charging power, safely accommodating the full STSC capability as well as BPP and EPP charging.

Features include support for Adaptive Rectifier Configuration (ARC), which extends the charging distance by up to 50%, allowing for lower-cost coils and more flexible configurations.

It provides accurate voltage and current measurement for Foreign Object Detection (FOD), thermal management, and system protection. This board uses ST’s STWLC98 wireless power receiver IC, which contains a Cortex-M3 core and an integrated high-efficiency synchronous-rectifier power stage with programmable output voltage up to 20V.

Software Tools and Availability

Dedicated software tools, ST’s STSW-WPSTUDIO for the STEVAL-WLC98RX and STSW-WBC2STUDIO for the STEVAL-WBC2TX50, are available to modify the configuration parameters, tailoring the operation of the device to the needs of customized applications. A comprehensive set of design documents is also available to assist development.

Conclusion

The introduction of these new wireless charger boards from STMicroelectronics represents a significant advance in the development of high-power wireless charging solutions. With advanced capabilities and dedicated software tools, these boards are well-positioned to facilitate innovation in various industrial and medical applications.

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