Feature wireless charger that can charge multiple devices simultaneously


More and more electronic devices with wireless charging systems, mainly mobile phones and tablets, that we can have around us.

Thinking of a future in which fewer and fewer devices depend on cables, plugs and other similar accessories, a wireless charging system with support for several simultaneous devices was presented.

A more efficient wireless charging system

This new technology, developed at Aalto University, Finland, may be the key to true wireless charging for these and other electronic products for years to come.

To date, implementing free position wireless charging systems involves the use of complex detection and control functions. Usually, a transmitter needs to first detect the presence and position of a device, to then be able to send energy in its direction, usually tracked by cameras or sensors. Although this solution works, the costs associated with its production rise and in addition, the devices end up adding a greater volume, due to the components involved.

The load transmitter proposed by the Aalto University team presents a more efficient alternative. Disregarding the creation of multidirectional power transfer channels, this system automatically tunes the channels when receiving devices, such as telephones, laptops and small gadgets, remain in motion, without being in physical contact with their charging source and without the need for be taken to a specific place.

“What sets this transmitter apart is that it is self-adjusting, which means you don’t need complex electronics to connect to receivers built into devices. Since it is self-tuning, the device can also be moved freely within a wide load range », explains Prasad Jayathurathnage, postdoctoral researcher at Aalto University and member of the team behind this project, in statements collected by a release from the house of studies.

Researchers have achieved the effect by designing the coils used in the transmitter, which when wound in a specific way, generate two types of electromagnetic fields: one going outwards and the other around. These fields couple the receiver and transmitter for efficient energy transfer.

The effectiveness ensured by this transmitter reaches 90% at a distance of 20 cm. At a greater distance, it works anyway, but with power losses. This is one of the aspects to be corrected, as this model is perfected.

“For now, the maximum range in maximum efficiency depends on the size of the transmitter and receiver. With proper engineering, we could reduce them. “says Jayathurathnage.

Although the team has demonstrated proof of concept, safety tests are still needed to confirm that the electromagnetic field generated by the transmitter is not harmful to humans. However, it is clear that the resulting electric field, which is known to be the main cause of potentially damaging effects, is minimal, since the technology is based on magnetic fields.

The project was presented as a proof of concept. Security tests still need to be carried out to guarantee the adequate security required by a system of this kind, which comes into direct contact with our organizations. Once deemed safe, this initiative could be implemented in specific commercial projects.

“True wireless charging means more personal freedom. You won’t have to worry about where you put your phone or if you remembered to plug it in »says Jayathurathnage.

A patent has already been requested for this technology, which within its growth aspirations plans to expand to the industrial area.