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Wireless charging without mats or pads

03.08.2021

Labs around the world are working to improve wireless charging technology, trying to expand it beyond charging mats and pads. However, the most common solutions use complex monitoring and detection functions, usually with cameras or sensors, which increase the size and cost of the charger.

Finnish Aalto University has been able to get around this problem: their new transmitter creates channels of energy in all directions, automatically adjusting them if the receivers are in motion. Phones, laptops and all kinds of gadgets equipped with a new receiver can simultaneously receive energy for charging batteries and for direct operation - without physical contact with the charger or fixation in a certain place.

The self-tuning effect is achieved due to the special way of winding the coils used in the transmitter. They create two kinds of electromagnetic fields, one outward and one around. These fields link the receiver to the transmitter for efficient power transfer.

At distances up to 20 cm, the transmitter efficiency reaches 90%. The authors expect to increase the range of peak efficiency by improving the experimental samples.

The technology, already patented by Aalto University, will be followed by a successful concept demonstration and security tests. It must be confirmed that the electromagnetic field generated by the transmitter is not dangerous to humans. However, it is already clear that the electric field - the main cause of potentially harmful effects - is minimal in this solution, since charging is based on the application of magnetic fields.

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It will be easier to understand the lecturer 24.12.2002

The Japanese corporation "JVC" introduced a radio receiver that automatically corrects the diction of the presenters and makes their speech more measured.

The development is focused primarily on older people who do not have time to perceive too fast speech. The speaker's voice is recorded on a semiconductor integrated circuit, where it undergoes fast processing: pauses are removed, due to which the words are slightly stretched.

At the same time, as far as possible, "eaten" endings, hesitation and other inaccuracies are corrected.

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