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Wireless chargers are expected to become ubiquitous in hotels, airports, cafes and other public places as they enable to top up the batteries of portable and wearable devices, letting the user forget about cables.

In a wireless battery charging system, power is transferred by electromagnetic induction (inductive power transfer) between a transmitting pad - or dongle (TX) - and the battery-powered device (RX), such as a smartphone, smartwatch or sports gear. The power transmitter unit controls the current in the transmitting coil to transfer the correct amount of power as required by the receiver unit that continuously provides this information to the transmitter by modulating the transmitter carrier frequency through controlled resistive or capacitive load insertion. Generating the correct amount of power guarantees the highest level of end-to-end energy efficiency and helps limit the device's operating temperature.

We have a range of wireless battery charging solutions including transmitters and receivers providing low stand-by power and features like foreign objects detection (FOD). ST also offers evaluation and development tools and reference designs to help develop high-efficiency and compact wireless chargers compliant with the most common wireless charging standards including Qi and AirFuel.

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN4900
      How to tune STEVAL-ISB038V1 wireless charging evaluation kit for wearable applications
      4.0
      1.1 MB
      PDF
      AN4900

      How to tune STEVAL-ISB038V1 wireless charging evaluation kit for wearable applications

Publications and Collaterals

    • Description Version Size Action
      STWBC Wireless battery charger 09.2017
      1.15 MB
      PDF
      STWBC-EP Extended Wireless Power 12.2017
      817.57 KB
      PDF

      STWBC Wireless battery charger

      STWBC-EP Extended Wireless Power

    • Description Version Size Action
      Brochure Power management guide 10.2018
      4.42 MB
      PDF

      Brochure Power management guide

eDesignSuite

Converter

Input

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V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

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Power Management

Part number Description
STWBC Digital controller for wireless battery charger transmitters supporting Qi A11 topology
STWBC-WA Digital controller for wireless battery charger transmitters for wearable and smart watches applications
Part number
Digital controller for wireless battery charger transmitters supporting Qi A11 topology
Digital controller for wireless battery charger transmitters for wearable and smart watches applications