Wireless power development system

16 May 2018 Power Electronics / Power Management Telecoms, Datacoms, Wireless, IoT

Under the name 760308EMP-WPT-200W, Würth Elektronik eiSos and Infineon Technologies are offering a 200 Watt development system for wireless power transfer.

What makes 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.

Expected to be available from the third quarter of 2018, the development kit comprises a power supply, a transmitter unit and a receiver unit. 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.

According to Cem Som, division manager for wireless power transfer at Würth Elektronik eiSos, “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 10 Watts 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 200 Watts, 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.”

For more information contact Jason Page, Würth Elektronik eiSos, +27 (0)71 259 9381, [email protected], www.we-online.com

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