Combining wireless power and data transmission together

The 760308EMP-WPT-200W development kit comprises a power supply, a transmitter unit and a receiver unit, and is a powerful solution thanks to the products from Würth Elektronik and Infineon (MOSFETS, drivers, microcontrollers, voltage regulators).

The transmitter side consists of a full bridge and a resonant circuit made up of the WPT coil and the resonant capacitors connected in series. Due to the phase shift between voltage and current in the resonant circuit, the system operates in Zero Voltage Switching (ZVS) mode. The result is a very high level of efficiency for the overall system.

On the receiver side, there is a synchronous rectifier with downstream filtering and sieving. Thanks to the AM modulation of the alternating field between transmitter and receiver, any data can be sent from the receiver side to the transmitter side.

A sample application would be a mobile device that sends sensor data to a base station during the charging process. All the data needed to implement this kind of proprietary system is offered for free download.

For example, for medical technology and IoT
Cem Som, Division Manager Wireless Power Transfer at Würth Elektronik eiSos, explained: “Customers have been asking us for years how they can operate their applications with power ratings that exceed the Qi standard. The circuit can be scaled from 10W to several kilowatts. The currents through the resonant circuit are sinusoidal, which favours the excellent EMC properties.

"Changing the switching frequency allows the output voltage to be altered and data to be transmitted from the receiver to the transmitter. We want to address applications with an output of 200W, outside the Qi standard. These are typically applications in the fields of medical technology, Industry 4.0, IoT, and all areas with harsh environmental conditions.”

To address the different requirements of wireless power transmission, semiconductor components from Infineon offer added value.

“Thanks to our broad product portfolio, we are able as a leading semiconductor manufacturer to play a major role in the development of efficient and innovative wireless power solutions,” said Verena Lackner, Global Application Marketing for Wireless Charging at Infineon. “Wireless charging is a key topic for Infineon, and together with Würth Elektronik we can use this system solution to effectively support customers in various design challenges.