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.
Modern wireless charging technology for mobile gadgets, although it simplifies the process of replenishing battery charge, still has a number of limitations. The QI standard really relieves users of smartphones and wearable electronics from the need to connect a cable to the connector of their device, but “ties” this process to a specific place - a surface with a charging pad. A solution that would not require any additional manipulations with the same smartphone would make a real breakthrough, a revolution in the industry. The first steps in this direction, such as the startup Cota, are already being taken. However, the effectiveness of the described system makes not only experts, but also ordinary people doubt the technology. However, it is the Wi-Fi signal that is considered as an alternative and conditionally promising method of transferring charge over a distance, which was demonstrated by researchers at the Sensor Systems Laboratory at the University of Washington using the example of their own “Power over WiFi” system.
Scientists were able, using a Wi-Fi signal as a basis, to ensure autonomous operation of a video surveillance camera and a sensor that determined the temperature. Thus, specialists from the University of Washington confirmed in practice that the technology under discussion has the right to life in certain situations.
It should be noted that the standard signal in the wireless coverage area seemed insufficiently reliable to American scientists, since the packet format of data transmission at those moments when it was required by a device connected to a public network did not allow the router to be used as a continuous power source. Therefore, the team of engineers slightly modified the access point based on the serial Atheros AR9580 chipset, which in no way affected the quality of the service provided - providing Internet access. As a result, the improved router model continuously filled the coverage area with so-called “noise” in the form of a radio signal, which was only responsible for recharging electronics with a homemade Wi-Fi module on board. The latter, in turn, acted not only as a receiver, but was also responsible for collecting wirelessly received energy.
TP-Link TL-WDR4300 router available on the market, equipped with an AR9580 radio module for operation in the 5 GHz band
The result of the experiment, which used an OV7670 video camera and a simple temperature sensor, was the following result: the developers of the “Power over WiFi” system were able to provide wireless power to the sensor for its continuous operation at a distance of six meters from the signal source. As for the camera, the achievements here turned out to be much more modest: in photo mode, the charge accumulated in 35 minutes using Wi-Fi was only enough to take one black and white photo with a resolution of 174 x 144 pixels (this required 10.4 mJ). The scientists resorted to two different layout schemes for the receiver module, as a result of which the working distance from the router to the camera ranged from 5-8 meters, including the wall separating the signal source and receiver.
According to the authors of the “Power over WiFi” project, wireless networks can become a completely acceptable way to recharge devices with minimal power consumption that would be activated for a short period of time - sensors for monitoring sudden changes in the environment.
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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.