200W development kit targets wireless power transfer

March 19, 2018 // By Julien Happich
The 760308EMP-WPT-200W offered by Würth Elektronik eiSos and Infineon Technologies AG is a 200-watt development kit for wireless power transfer, where the link between the transmitter and receiver coils can be used to transfer not only power but also data.

The 760308EMP-WPT-200W 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. 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.

“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”, explains Cem Som, Division Manager Wireless Power Transfer at Würth Elektronik eiSos.

Infineon Technologies - www.infineon.com

Würth Elektronik - www.we-online.com


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