Würth Elektronik and Infineon 760308EMP-WPT-200W development kit for wireless power transfer

Würth Elektronik and Infineon Technologies have jointly released a development system for wireless power transfer, the 760308EMP-WPT-200W. The 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 high system efficiency.

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.

The product serves to develop applications outside the Qi standard up to a power of 200 W. Options include sensors and a display board to test scenarios for data acquisition, forwarding and display.

The currents in the resonance circuit are sinusoidal, which ensures good EMC performance, and the circuit can be scaled from 10 W up to several kW. By changing the switching frequency, the output voltage changes and data can be transmitted from the receiver to the transmitter.

Possible fields of application include Industry 4.0, IoT or medical technology. 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.