Wi-Fi charger. Powering gadgets and charging batteries via WiFi

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Radio waves from WiFi networks completely fill indoor spaces. In fact, this radiation carries considerable energy, which is wasted, wastingly heating the walls and furniture of the apartment. It can be used usefully - for charging batteries and operating miniature electronics.

For example, here are the prototypes of four gadgets that were powered by WiFi as part of the Seattle experiment (more about it below).

Camera without battery (maximum distance from router can be 5.8m)

Temperature sensor (max. distance 6 m)



Charger for lithium-ion batteries (max. distance 8.5 m)

Charger for NiMH batteries (max. distance 8.5 m)

In Seattle, six houses took part in the experiment. They were given WiFi routers and a collection of electrical gadgets with an energy harvester that converts 2.4 GHz radio waves into direct current.

An experiment in real conditions showed that within 24 hours, all distributed devices were powered exclusively by energy from WiFi radio waves, while the router continued to successfully perform its main function, distributing Internet traffic to computers and other home devices.

The authors say a key problem with WiFi power transmission is the uneven transmission pattern, which makes it difficult to achieve the voltage required to operate mobile devices (0.3V).

So the developers introduced PoWiFi - what they say is the world's first truly working system that uses existing commercially available WiFi chipsets to harvest energy and power. The key elements of this system are a WiFi transmitter and an energy harvesting module.

In particular, the Atheros WiFi transmitter chipset was modified to inject small amounts of traffic into empty spaces.

The energy harvesting module was made to work simultaneously on several 2.4 GHz WiFi channels.

Module design: a matching circuit, an electric current rectifier converts the wave energy into direct current, and then the voltage is increased to a useful level by a DC-DC converter. The module exhibits reflection loss of less than -10 dB in the 72 MHz WiFi operating range.

The researchers were able to successfully power the Omnivision OV7670 VGA video camera and temperature sensor via WiFi, as well as charge Li-Ion and NiMH batteries (standard AA batteries).

All details of the described design are explained in a scientific paper, where the efficiency of the system is also assessed based on the results of the experiment.

P.S. Interestingly, in one of the additional experiments, the researchers built a structure from two antennas, their energy harvesting module with USB output.

This system allows you to charge any USB gadgets at a good speed. For example, they increased the Jawbone UP24 fitness bracelet to 41% in just 2.5 hours.

It would be nice to put more of these energy collectors in the apartment. Or all over the entrance.

There are many references to charging gadgets via Wi-Fi, which may well save us from the annoying process of charging from the network, because modern smartphones, tablets and other portable devices in most cases do not have a very capacious battery on board, this is primarily due to their size devices. At the same time, screen diagonals are growing and consuming more and more energy. It's hard to remember a time when the phone was charged once a week. Everything develops and grows, but not the capacity of the food elements.

Charging over Wi-Fi: myth or reality?

Four years ago, at the CES 2010 (Consumer Electronics Show) exhibition, which traditionally took place in Las Vegas, a device was announced that extracts energy from the environment, including from waves. The RCA Airnergy Charger showed great promise, because wireless networks are available almost everywhere, which means the battery charge will always be at maximum, isn’t that cool?

But let's face it, more than four years have passed, all this time the world market leaders have been fighting to increase the capacity of power supplies, but this device has not been heard of anywhere. After a little calculation, we can easily say that the energy of radio waves, with the help of which wireless networks operate, is not enough to charge any device.

Program for charging your phone via Wi-Fi

There are also people who believe in such nonsense, but in practice it is impossible. And if you think that you will download such a program and forget about the low battery charge, then you are deeply mistaken.

Wireless charger

But wireless charging exists, although it works on a different principle. Induction charging is available on many new gadgets, but in order to charge something from it, you need to be in close proximity to the source, namely at a distance of a couple of centimeters. And this already gives us hope, because it’s cool to have a table on which you can put a laptop, a tablet and a phone, and everything will be charged at the same time. Down with the wires, give induction charging to all devices!

Wireless chargers are already rapidly gaining popularity and are beginning to actively occupy their niche in the market. But such technology is already actively stepping on the heels of such an idea as charging a phone via Wi-Fi.

Chronology of development

The idea of ​​transmitting energy over long distances without the use of accompanying conductors has long been exciting the minds of the best thinkers on the planet. The first progress in this matter began at the beginning of the 20th century.

The well-known Serbian scientist Nikola Tesla discovered, implemented and described such technology. But society was not ready for such technologies, since the memories of the witch hunt and incidents in Salem were still alive in the people’s memory, and therefore the technology was consigned to oblivion and sank into oblivion. But only up to a certain point.

A lot of time has passed since that moment, several world wars have happened, and now humanity has reached a level of development at which ideas that were almost a century old are not so crazy and unacceptable.

In addition, technical progress and the evolution of microprocessor technology are a very good help for converting electromagnetic waves into a directed flow of electrical energy.

There is no doubt that somewhere in closed facilities a similar technology has long been developed and brought to perfection. But these devices are unlikely to be used for industrial purposes. Therefore, I propose to consider those options that were initially aimed at entering the civilian market.

Current level of development

The first time we heard that charging a phone via Wi-Fi had become possible was about five years ago. This device was demonstrated at CES 2010 under the name RCA Airnergy Charger. According to descriptions of the operating principle, it was similar to the device proposed by Tesla.

Airnergy

The device was a small box of quite acceptable dimensions for constantly carrying in a jacket pocket; A cable came out of the box to connect to the phone. Inside there was a small circuit with a Wi-Fi signal receiver and a small capacity battery. Specific technical data were not published, but a figurative model of the device’s operation was outlined.

The receiver intercepts radio waves through which information is transported, registers their vibrations, frequency and amplitude. After which the circuit arranges them in such an order that they are no different from electricity fluctuations. Having completed the transformation, the newly generated electricity begins to fill the battery capacity. All that remains is to connect the device and watch how charging occurs.

But, alas, despite the genius of the idea, its implementation left much to be desired. The general operating methodology, ergonomics and internal design of the board were not very well polished and did not even allow it to enter the market. What can we say about the ability to compete with traditional methods of power supply.

Efficiency was abysmally low, despite the fact that the presentation claimed to charge a BlackBerry device from 30% to full charge in just 90 minutes. But in reality, the technology was crude, and the release of the device announced for the summer of the same year never materialized. Its cost should have been about 40 US dollars.

Product from Energous

Currently, the Energous company already sells such a device. Technological subtleties are not disclosed for reasons of intellectual property protection, since this technology is already more advanced than that previously described.

There is no longer any need to connect to a gadget for charging. The device itself converts the waves in such a way that they are focused not on data transmission, but on replenishing the charge level. The only significant drawback is that it works in only one mode: the device either charges a mobile device or provides access to the network.

Perhaps, if it weren’t for such a specific operating principle and the need to buy a new smartphone, the device would have found its audience.

Power over Wi-Fi

Finally we got to the flagship of the implementation of such an idea. At the end of the first half of this year, it became known that the Washington Research University was at the stage of actively testing a new technology, power over Wi-Fi, which even then made it possible to charge not only the batteries of mobile devices. Satisfactory results were also obtained when replenishing the battery charge level in the watch.

Compared to the two previous charging methods, this method has several distinctive features.

Firstly, there is no need to buy separate special devices or a new smartphone. All you need to do is reflash your home router. This will in no way affect its performance as an information relay. No hardware changes are required at all.

In our world, when we are surrounded by wires everywhere in the office, at home, with friends, wireless charging is a salvation. With multiple devices at your disposal, I bet you have at least two chargers next to your bed. I'm right? It is because of this that many smartphones on the market have wireless charging capabilities using the Qi standard. Today, Ossia Inc...

In our world, when we are surrounded by wires everywhere in the office, at home, with friends, wireless charging is a salvation. With multiple devices at your disposal, I bet you have at least two chargers next to your bed. I'm right?

It is because of this that many smartphones on the market have wireless charging capabilities using the Qi standard. Today, Ossia Inc has made another breakthrough; according to company representatives, all devices that have Bluetooth or Wi-Fi can be charged wirelessly.

Unlike existing wireless charging standards, which operate over a very short distance, Ossi Inc's development, called Cota, allows devices to be charged at a distance of up to 30 meters. This technology uses Wi-Fi signals and Bluetooth waves as “wires” through which charge is transmitted. In addition, Cota Ossia uses for this purpose already existing antennas that are installed in the devices. Based on this, manufacturers will not need to change anything. All that is required is the installation of a special chip that converts the signal.

As you would expect, with the advent of new wireless charging technology, new chargers and so-called “receivers” have appeared. Tiny IC receivers can be installed either on the smartphone or tablet board itself, or in the battery itself. After the Cota Ossia charger detects this chip within its range of action, it will “send” thousands of signals to the receiver, which the chip will convert and thus the device’s battery will receive the charge it needs. If you are afraid of any radiation, then according to representatives of Ossia Inc., their charger emits a signal no more than a mobile phone during a conversation.

Next generation wireless charging: Ossia Cota

Based on this, such chargers can be installed anywhere: in the home, office, cafe and even outdoors. So, with this wireless charging technology, you can charge your devices without even knowing it. It is worth noting that this technology can recharge not only smartphones and tablets, but also other household appliances. At least that’s what the manufacturer’s company representatives said.

At the moment, Ossia Inc. intends to enter into contracts with various manufacturers of both mobile devices and household appliances. Considering that smartphones nowadays are increasingly being used “next to the socket,” this technology could truly become a breakthrough in this area.