Würth Elektronik eiSos and Infineon Technologies have jointly brought a development system for wireless power transfer to market. The kit serves to develop applications outside the Qi standard up to a power of 200 W.
Data can also be transmitted via transmitter and receiver coil, as well as receiver sending data to the transmit coil. A manual is available online and explains the innovative method of modulating the alternating field between transmitter and receiver. Options include sensors and a display board to test scenarios for data acquisition, forwarding and display.
Possible fields of application include Industry 4.0, IoT or medical technology, for instance. Wherever there are harsh environments with any cable and connector openings in enclosures which should be avoided, such as in the case of wireless battery charging, it may be expedient to convey status messages.
The 760308EMP-WPT-200W development kit includes a power supply unit, a transmitter and a receiver unit. The transmitter side consists of a full bridge and a resonance circuit. This is formed from the series connection of the WPT coil and the resonance capacitors. As a result of the phase shift between the voltage and current in the resonance circuit, the system works in ZVS (zero voltage switching) mode. This leads to a very high efficiency of the overall system.
A synchronous rectifier is used on the receiver side with downstream filtering and screening. In addition, amplitude modulation (AM) of the alternating field between the transmitter and receiver allows any data to be sent from the receiver side to the transmitter side.
An application example that can be simulated with sensors at the I²C interface of the receiver board, is a mobile device that sends data to a base-station while charging. All data and documentation necessary to realise a proprietary system of this kind are freely available for download.
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