They follow the Qi standard set by the Wireless Power Consortium (WPC) that allows for 5-15 watts of power. The drawback? The coils must be closely coupled and precisely aligned even a vibrating text message can move the phone enough to stop the magnetic induction.Ĭhargers using magnetic induction are very popular. The benefit? Very high efficiency when the coils are perfectly aligned, with 30-60% of the energy created being transferred to the receiver coil. The larger the coils, the larger the magnetic field. When a device with a wireless receiver coil is placed directly on top of a charging pad with a transmitter coil, the device battery is able to charge by intercepting the magnetic field created by the charging pad. The process behind wireless charging through magnetic induction is pretty straightforward. It transfers power easily between non-resonant but closely coupled coils. Inductive wireless charging uses a low-frequency oscillating field between 110 and 205 kHz to generate an electric current with a magnetic field. How Does Wireless Charging Work? Magnetic Induction However, newer and more complex wireless chargers using radio frequencies and ultrasound are starting to gain ground. Magnetic induction wireless charging is very common today, and used for most smartphone and smart technology charging. Does the name Tesla ring a bell? Read our blog article about Tesla and how his technology inspired electric cars. In 1894, Nikola Tesla first discovered magnetic induction, which is the foundation for modern day wireless charging. Though it has only started to integrate with consumer electronics in recent years, wireless charging technology has actually been around for over 100 years. Car models, hotels, and even some McDonald’s restaurants are all hopping on the wireless charging movement. Wireless chargers themselves are getting integrated in new and interesting places. True, there is a wire connecting the wireless charger to an outlet, but the device does not have to have a cord, making it less of a hassle to charge. Wireless charging existed with many products before it debuted in mobile devices: headphones, kitchen appliances, and power tools are all capable of charging without a cord being connected. In 2017, Apple released the iPhone 8 with wireless charging capabilities. Samsung first introduced integrated wireless charging in a mobile phone in their Galaxy S6 & S6 edge models in 2015. Wireless charging did not become mainstream in phones and mobile devices until relatively recently. Can these wireless chargers be increasing your EMF exposure? Keep reading to learn more about how the technology works and how it could be impacting your health. The latest example? The split second saved by placing your phone on a wireless charger instead of plugging in a charging cord.Īs a wireless electronic device, EMF radiation concerns arise. Wireless charging is becoming more prevalent and integrated into daily life, as modern day society morphs into a lifestyle of convenience.
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