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Wireless charger controller offers power, design solutions

03 Mar 2015

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STWBC digital controller

As wireless charging becomes more and more popular for everyday devices, developers are responding by introducing innovative wireless charging solutions. STMicroelectronics is the first to introduce a customisable, designer-friendly wireless battery charger (WBC) controller, which can control power transfer from a WBC transmitter (TX) to a receiver (RX).

The STWBC digital controller can be used in WBC-enabled phones, wearables and other battery-powered devices that employ electromagnetic induction for recharge. It can control the amount of transmitted power to match the requirements of the receiving unit, maximising the efficiency of power transfer and minimising the increase of operating temperature.

The digital feedback between the TX and RX units also allows foreign object detection (FOD). For instance, it can detect metal objects close to the receiver, which might pose hazards. Upon detection, the STWBC would stop transmitting power for safety.


The key features of the STWBC include the following:

  • Multiple Qi and Power Matters Alliance standards support
  • Qi 1.1.2 A11 certification
  • Up to 5W power capability for mobiles, wearables and remote controls
  • Native support for half-bridge and full-bridge topologies
  • Operating voltage of 5V

Uniquely, the STWBC comes with the following firmware options that allow customers to personalise their end products without using external microcontrollers:

  • A turn-key Qi 1.1.2 A11-certified solution (reference design board STEVAL-ISB027V1), fully interoperable with Qi-enabled mobile phones
  • Application programming interface access to customise the underlying firmware; for example modifying, the behaviour of the LEDs or GPIOs in response to the receiver behaviour and supporting I2C and UART communication within a network
The device also offers its customers support in building their applications, including the Qi 1.1.2 A11-certified reference design board (STEVAL-ISB027V1), API libraries and documentation to develop software customisations as well as a graphical user interface to monitor real-time performance and diagnostics.

Housed in a VFQFPN32 package, the STWBC is available in full production at a price of $3 in 1K volumes.




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