Researchers at the University of Washington made a prototype router, PoWifi, to convert Wi-Fi signals into electricity and charge digital products such as cell phones. The research team installed PoWifi routers for 6 homes to keep them connected for 24 hours. The radio waves emitted by the router are converted into DC voltage through a rectifier. This process is similar to the conversion of solar energy into electricity by solar panels. Then use the converter to increase the voltage to meet the use requirements. The researchers demonstrated using PoWifi to charge the camera placed 5 meters away from the router and also showed the charging effect of charging the temperature sensor. In addition, the experience of 6 households shows that charging does not affect the speed.

The surround backscatter technology developed by American engineers can utilize Wi-Fi signals and convert them into electricity. Surround backscatter is also called Wi-Fi backscatter. This technology allows two digital products to be powered by wireless signals.

1. The router transmits the binary code by absorbing or reflecting the Wi-Fi or TV signal in the air without the need for a battery. Past experiments used Wi-Fi to provide a small amount of power, which would cause too much interference and slow down the wireless network. However, the new method is to maintain data transmission speed by jumping between Wi-Fi channels in the 2.4 GHz wireless band.

2. Using a rectifier, the energy of the radio waves emitted by the router will be converted into a DC voltage. This principle is similar to the fact that solar panels convert light energy into electricity.

3, through the DC converter to raise the voltage to a usable level.

Will not cause interference to the speed of the network

Wi-Fi backscatter technology was first published by the research team of the University of Washington. At the recent MIT EmTech Digital conference, the team’s chief engineer, Shiam Gracota, demonstrated the router. The research team installed a prototype router called PoWiFi in six homes and required users to use this router throughout the day.

Continuously provide enough energy

This system can be used to charge temperature sensors and low-resolution cameras without batteries, as well as standard cell phone batteries. Part of the difficulty is getting the router to provide enough energy, said research team member Fumish Tana, a researcher at the University of Washington in Seattle.

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