Development system for wireless power also transfers data

Würth Elektronik eiSos and Infineon Technologies AG are offering a 200-watt development system, the 760308EMP-WPT-200W, for wireless power transfer. Unique to the development kit special is that the link between the transmitter and receiver coils can be used to transfer not only power but also data.

 The 760308EMP-WPT-200W development kit comprises a power supply, a transmitter unit and a receiver unit, and is an innovative and 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.

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

The 200-W-WPT will be available from the third quarter of this year.

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