According to "Linkage" magazine on June 29th, Beijing time, Vamshi Tala is a research assistant at the University of Washington Joshua Smith Laboratory. In recent days, Tara has demonstrated a magic mobile phone that requires no battery. call. "Hello, Hello. I'm calling you on a cell phone that doesn't have a battery," Tara said in a messy lab. Originally, this prototype cell phone can actually draw a small amount of current from the thin air. This is Tara's many years of research results. "If you have to choose a device and let it get rid of the battery, what would you choose?" Tala asked. “The mobile phone is one of the most useful things. Imagine what if your battery runs out and you can still text or call.†To realize this vision, we need to think fresh about the way the current mobile phone operates. To make the phone work without a battery, the phone will have to be able to absorb energy from the surrounding environment. With Solar Panels or diodes, ambient light can be transformed into a steady flow of electricity. With an antenna, radio frequency television and Wi-Fi signals can also become electrical energy. A hybrid system of two technologies may generate tens of microwatts of electricity, but the problem is that traditional mobile phones require 10,000 times more power than this, for example, about 800 milliwatts when calling. The first problem the team solved was communication. Smiths Laboratories has developed a technology called "backscattering" that allows devices to communicate through reflected radio waves. It's a bit like an injured climber using the sun and the mirror to send a distress signal. Smith has set up a startup called Jeeva Wireless to commercialize its so-called "passive Wi-Fi" technology. This is a digital backscatter technology for ultra-low power Wi-Fi devices. However, even "passive Wi-Fi" technology is too power-consuming for Tara's mobile phone project. "Converting analog human languages ​​into digital signals consumes a lot of power," Tara said. "If you use analog technology to communicate, the energy efficiency will be much higher." Therefore, although the aircraft uses digital signal dialing, the backscattering of voice calls The process is purely analog. In the process of developing simulated backscatter technology, Smith realized that he was reinventing a spy technology during the Cold War. In 1945, the Soviet government gave the U.S. ambassador a statue of the United States and India. An audio component is placed inside, and it is activated only when the frequency of the radio waves matches, and then uses the energy of radio waves to operate. Like a spy device, some of Tara’s cell phones are also placed in remote locations to save power. A nearby prototype base station has circuits that are used to convert and connect to a digital cellular network, currently via Skype. The base station uses an unauthorized frequency and is limited to low-power transmissions. Because the aircraft relies on the signal to extract energy, it cannot be more than 15 meters away from the base station. To make this machine commercially available, the circuit can be built into a Wi-Fi router at home or placed in a traditional cell tower. "The real cell phone tower power is several hundred times higher, or it can expand the distance to one kilometer," Tala said. However, these are still far from being realized. The machine has a simple touch digital version. Its display is a small LED light that glows only briefly when the button is pressed. If equipped with a large touch screen, it will need about 400 milliwatts of electricity, about 100,000 times the power required by this phone. The most important thing is that it's awkward voice call. You must press the button like a walkie-talkie to switch between listening and speaking. Tara said that the next-generation models will have better call quality, as well as an e-ink display for sending text messages, and perhaps a camera. Smith said that although the aircraft is a prototype, it uses off-the-shelf components and is therefore much cheaper than regular phones. If mass production, it can be cheaper. Better yet, you will never have to worry about forgetting to bring your charger. Solar Street Light,Outdoor Solar Street Lights,Solar Light,Solar Street Lamp China Searun Solar Solution Co., Ltd. , https://www.searunsolar.com
The battery can also call without electricity! Mobile phone without battery