South Korea develops sound charging technology: The bigger the voice, the faster the phone charges

Scientists are developing technology and the future for charging mobile phones with sound. If a person calls loudly not because he is not polite, it is possible that he is charging for his mobile phone.　　Because now scientists are developing technology that uses sound to charge cell phone batteries, the louder the sound, the faster the charge. A few days ago, South Korean scientists have invented a device that allows the phone to recharge with sound while talking. The technique converts sound into electrical energy. This means that those who like to "phone" phone users do not have to worry about the phone will soon not be able to power, but also for the cell phone batteries will continue to charge, the more sound, the faster the charge.　　It is reported that this technology is not limited to the mobile phone domain, can also be integrated into the portable player field. Sang-woo Kim, a researcher at the University of Han, said that, just as a loudspeaker converts an electrical signal into a sound, a sound signal can become a power source, a process that is reversible. He added: "A lot of people are exploring how to get energy from the living environment, our daily life and the surrounding environment is full of sound, but no one sees it as a kind of energy, in fact, speech, music or noise can be converted into electricity to use." "This device uses piezoelectric effect to generate electricity, and can convert the volume of about 100 db to 50 mv voltage." But the average mobile phone's operating voltage is 2 to 3 volts, and People's Daily speaking volume is about 70 db, so at present the technology can not be charged for normal mobile phone calls.