New Industry Products

2.5W Wireless Charger Transmitter Evaluation Kit

May 18, 2018 by Paul Shepard

The STEVAL-ISB045V1 evaluation kit from STMicroelectronics includes the STEVAL-ISB045V1T wireless battery charger transmitter evaluation board based on the STWBC-WA digital controller, the firmware and the STEVAL-WBCDNGV1 USB-to-UART dongle needed to use the STSW-STWBCGUI.

The STEVAL-ISB045V1 firmware offers the flexibility of modifying LEDs or GPIO behavior and customizing I²C and UART signals. The layout is based on cost-effective two-layer PCB.

Tools for the STEVAL-ISB045V1 evaluation kit are available now and allow users to access run time information such as regulation error, frequency or protocol status.

The STWBC-WA digital controller upon which the STEVAL-ISB045V1 is based is STMicroelectronics' wireless battery charger transmitter application optimized for wearable usage. Thanks to its 5V native supply, the STWBC-WA device is suited to operate with USB power supplies.

Wireless battery charging systems replace the traditional power supply cable by means of electromagnetic induction between a transmitting pad or dongle (TX) and a battery-powered unit (RX), such as a smartwatch or sports gear.

The power transmitter unit is responsible for controlling the transmitting coil and generating the correct amount of power requested by the receiver unit. The receiver unit continuously provides the transmitter the correct power level requested, by modulating the transmitter carrier through controlled resistive or capacitive insertion.

Generating the correct amount of power guarantees the highest level of end-to-end efficiency due to reduced energy waste. It also helps to maintain a lower operational temperature.

The digital wireless battery transmitter can adapt to the amount of energy transferred by the coil by modulating the frequency, duty cycles or coil input voltage.

Key features of the STEVAL-ISB045V1 evaluation kit include:

  • STWBC-WA digital controller
  • 5 W output power
  • Resistive and capacitive modulation
  • Foreign object detection (FOD)
  • Active presence detector
  • Turn-key and firmware APIs
  • Total reference design (IC, firmware, GUI and dongle)