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Wireless charger basics and status of wireless charging technology

Edit:Shenzhen Keliway Technology.,LtdUpDate:Apr 07, 2018

Wireless charger The wireless charger is a device that uses the principle of electromagnetic wave induction to charge. The principle is similar to a transformer. Each of the sending and receiving ends has a coil. The sending end coil is connected to a wired power supply to generate an electromagnetic signal, and the receiving end coil senses the electromagnetic signal of the sending end to generate a current to charge the battery. Introduction Wireless charging technology won 20 patents in 2007. A variety of devices can use a charging dock, mobile phone, MP3 player, power tools and other power adapters. The situation of scissoring will not exist. . By using the magnetic field generated between the coils, magical transmission of electrical energy, inductive coupling technology will become a bridge connecting charging base stations and equipment. Most current chargers, such as iPods and iPhones, charge the device's internal battery by direct contact with a metal phone. The advantages of wireless charging technology are convenience and versatility. The disadvantage is that it is inefficient and can only provide electricity. And Apple's dock connector not only provides power, but also can synchronize audio and video files to the device through the USB interface from the technical point of view, while transmitting digital files over the wireless network and charging is not realistic. In the actual test of some products, the ideal speed through the 802.11b / g wireless transmission protocol is about 3MB / s, and the USB cable transmission speed is more than ten times faster, reaching more than 20MB / s. Wireless data transmission is very power-consuming for mobile devices. Therefore, it is still unrealistic to use the wireless charging technology with slow charging and wireless data transmission. Therefore, the ideal wireless life has to wait for several years. However, wireless charging technology will still bring improvements to WiFi and battery technology. For devices that do not require data transmission, this new technology will greatly reduce the number of chargers required by users. In addition, through the use of wireless charging technology, public mobile device charging stations will likely become a reality.

A British company invented a new type of wireless charger. It looks like a plastic mouse pad. It can charge a mobile phone or the like on a pad and can charge multiple devices at the same time.

The pad is equipped with a dense array of small coils that generate a magnetic field and transfer the energy to an electronic device equipped with a dedicated receiving coil. The receiving coil is made of a magnetic alloy wire and is similar in size and shape to chewing gum. It can be easily posted

According to the British "New Scientist" magazine published on the 22nd, this "mouse on electronic devices.


Wireless charging technology has appeared before, but this new invention is more convenient and practical. Mobile phones and other devices can be charged at any position on the "mouse pad" as long as they are attached to the receiving coil. Unlike previous technologies, they do not require precise positioning. Several devices are placed on the mat at the same time and can be charged at the same time. The magnetic field generated by the charger is very weak and can charge the device without affecting nearby credit cards, videotapes, and other items that use magnetic data recording. Development History

As early as the 1930s, Michael Faraday discovered that changes in the surrounding magnetic field would generate electrical current in the wire. In the 1990s, an assistant to the Edison Spectroradiometer Energy Research Project, Nikola Tesla, applied for the initial One patent.


Unfortunately, this research has been delayed for a century. The biggest obstacle is the low transmission efficiency and danger. Electromagnetic radiation is only suitable for transmitting information and is not suitable for transmitting energy. Because radiation is not directional, energy will be wasted in useless space. Some people think of using directional electromagnetic radiation, such as lasers, but they are not operable and dangerous.


Prof. Xu Shuyuan of the Department of Electronic Engineering of City University of Hong Kong successfully developed the “Wireless Battery Charging Platform” in the early years. Several electronic products can be placed on a charging platform. No external wires are needed. Automatic charging through low-frequency electromagnetic fields and charging The time is no different from traditional chargers. However, this technology still requires the product to contact the charger. It mainly uses the near-field electromagnetic coupling principle.


Researchers at the Massachusetts Institute of Technology in the United States have recently made new advances in wireless transmission of electricity. They used a power source two meters away and lit the 60-watt light bulb across the floor.


Sorjačić's design has limited distances for non-radiative wireless energy transmission. The smaller the receiver, the shorter the distance. He calculated that laptop-sized objects can receive wireless power transmissions within a few meters, so that installing an emitter in each room would power the entire home's laptop.


Soryacchi hopes to increase efficiency to 70% to 80% through the use of different materials and improved technologies. They believe that the improved device will wirelessly charge laptops, mobile phones and other devices in 3 to 5 years. working principle

Physicists have long known that energy can be effectively transmitted between two objects having the same resonance frequency, and the interaction between objects having different frequencies is weak. The singer's singing can shatter one of the different water bottles without affecting the other bottles. It is also like when we are swinging, just sitting on the top and letting the legs swing in synchrony can give the swing the same power.



Wireless charging technology takes advantage of this principle. Similarly, wireless charging technology also applies the principle of electromagnetic wave induction, and the related AC induction technology. A technology that sends and receives the generated AC signal at the sending and receiving ends to send and receive the induction AC signal, the user only needs to Charging devices can be charged on a "flat", which used to appear on watches and razors, but was unable to effectively charge large-capacity lithium-ion batteries. Wireless charger technology principle composition as shown


A new type of wireless charger was originally invented by a British company. It looks like a plastic mouse pad. This "mouse pad" is equipped with a dense array of small coils that generate a magnetic field and transmit energy to a dedicated receiver. The electronic device of the coil is charged. The receiving coil is made of a magnetic alloy wound around a wire. It is similar in size and shape to chewing gum and can be easily attached to electronic devices. Placing a cell phone or the like on the pad will charge it, and it will charge multiple devices at the same time.



Wireless charging technology has appeared before, but this new invention is more convenient and practical. Mobile phones and other devices can be charged at any position on the "mouse pad" as long as they are attached to the receiving coil. Unlike previous technologies, they do not require precise positioning. Several devices are placed on the mat at the same time and can be charged at the same time. The magnetic field generated by the charger is very weak and can charge the device without affecting nearby credit cards, videotapes, and other items that use magnetic data recording.

Researchers at the Massachusetts Institute of Technology say that the body's response to the electric field is strong, but the body's reaction to the magnetic field is almost non-existent, so this system will not affect human health. However, this is only a speculation, some researchers expressed concern about this view, in the real application of life, but also need to further test.


As an electronic charging product, the charger itself can not avoid radiation, so wireless charger radiation is inevitable. However, at present, the power of the wireless charger is very small, the charging time is long, and the generated radiation is also small, which should not cause great harm to people. Unified charger port

To avoid unnecessary waste and generate more e-waste, China is implementing unified standardization of mobile phone charger ports, but for wireless charging technology, this will be the most popular. Not only mobile phones can be used, digital cameras, IPONE and iPad, and laptops can also share this charging device. Japan’s Fujitsu is even preparing to introduce a more advanced technology that will extend this success from portable electronics to electric vehicle charging. The ultimate goal of Fujitsu’s move is to set up a public “charging point” on the street, which will make it easier for portable digital devices and electric car users to provide 24-hours-a-day charging services. In addition, wireless chargers are smarter to save energy. Although the performance of the wireless charging device is about 70%, which is equal to that of a wired charging device, it has an automatic full-off function to avoid unnecessary energy consumption. And this performance acceptance rate continues to increase and it will soon reach 98%.


Mobile phone will have built-in charging receiver and unified wireless charging standard



To achieve wireless charging of mobile phones and other products, there must currently be two parts: the transmitter, which is connected to the power supply, is responsible for transmitting power to a wide space; the receiver, which is generally installed on the electronic product, is used to receive power. Currently wireless charging technology has begun In the case of mobile phones, the iPhone is used as an example. Now that wireless charging manufacturers have wireless charging capabilities, they have been retrofitted with a "cloth" that resembles an "apple." As a wireless charging receiver, it is presently in the form of an increase in the charging of mobile phone casings, but related transformation products may be available in China this year. At present, this shell is called "Qimen", it supports iPhone and BlackBerry, users do not need to replace the mobile phone can be the first to experience this feature. At the end of this year or early next year, the wireless charging receiver will be fully "thin" and become a wireless charging receiver chip built into the mobile phone product, which is only as large as a fingernail cover. At present, Nokia, Philips, LG, Samsung, Sony Ericsson and RIM and many other internationally renowned mobile phone manufacturers support this technology. Wireless chargers may also be bundled with mobile phones for sale.



The key to mobile wireless charging is compatibility. Qi standard ensures brand compatibility.


Wireless charging technology mainly uses electromagnetic technology, which converts current into electromagnetic in the transmitter. The mobile phone converts the electromagnetic current into a current through the built-in chip receiver to charge the mobile phone. The key to the promotion of wireless charging technology lies in ensuring that all manufacturers' wireless chargers are compatible. Menno Treffers, chairman of Qi Standard Wireless Charging Alliance, said that the Qi wireless charging standard uses electromagnetic induction technology, which is more efficient and safe than other technologies. High-Qi wireless charging standards include three aspects of interface, performance, and regulations, which will pose considerable challenges for the popularization of wireless charging technology. Therefore, mobile phones that pass the Qi standard will be able to pass any Qi-certified charging stations. Other rechargeable devices for wireless charging. Qi's first requirement for the device is no more than 5 watts, which may be a major limitation for some manufacturers who want laptops to also be able to pass wireless charging technology.



Some manufacturers have introduced Qi standard wireless charging products and have a wide market




Energizer recently announced that it will soon introduce wireless charger products that support the Qi standard, and will initially bring a new experience of wireless charging to Apple iPhone 3GS and BlackBerry Blackberry Curve 8900 users. At the same time, data provided by market research company iSuppli shows that the wireless charging equipment market will reach a scale of US$14 billion in 2013. Philips has already begun to produce new phones with wireless charging settings. The Philips X723 mobile phone has appeared, and its mining is a 3.2 inch 240X400 screen with GPS and 3 million pixel camera. Fortunately, the aircraft will be standard wireless charger Xenium Q1 (Qi wireless charging alliance standard), but the specific time to market and the price is not yet disclosed.