| Wireless charging is very hot recently, and mobile phones are also being used on a large scale with wireless charging technology, but we are still far away from the real wireless power supply (Wireless power and wireless charging, although the equipment is similar, but the concept is still very different), However, the recent wireless power supply is the first to be applied to the mouse. Why does the wireless power supply mouse be used first? How far away are we from the real wireless power supply?  Recently, we have collected three wireless charging/powering mouse peripherals currently on the market and are ready to do a horizontal review. However, the time between the three products needs a little time. Here we will give you a preview. Incidentally, we talked about wireless charging/power supply, and the difference between wireless charging and wireless power supply. Everything comes from wireless transmission technology In fact, whether it is wireless charging or wireless power supply, in fact, it is all derived from wireless transmission technology.  Speaking of wireless power transmission, we now generally believe that Tesla was first invented by Nikola Tesla at the end of the 19th century, and Tesla originally worked under Edison's hands. Since he disagreed with his opinions, the reason for the breakup was that Tesla believed that AC It is the future, and Edison thinks that the future belongs to DC power and has been torn for a long time. The final result, of course, we already know. The reason why AC can win is because the AC power can be transformed easily. We know that long-distance transmission of electrical energy requires ultra-high voltage to ensure that power is minimized during transmission. However, if DC power is to be transformed, it needs to pass through. : The first step is first converted to alternating current, the second part is transformed, and the third step is converted to direct current. This will result in increased power consumption, increased equipment costs, and increased difficulty in processing. Therefore, AC power has become our current Power transmission methods are in use.  The power wireless transmission is precisely based on the discovery and application of alternating current, the changing electric field can produce a changing magnetic field and can inspire distant coils to produce a changing electric field (one of the transformer's working principles). So many people at the time studied how they could Increasing distance has unfortunately been unsuccessful. Four Ways of Wireless Transmission Based on electromagnetic induction technology, the wireless charging/wireless power supplies we use today are based on the principle of electromagnetic induction. At least our current commercially available devices are all electromagnetic induction devices. There are currently four ways to achieve wireless power transmission: Magnetic induction, electromagnetic resonance, electromagnetic coupling and microwave resonance.  Most of the various types of wireless charging technologies we see today use electromagnetic induction technology. We can think of this technology as a separate transformer. We have removed the central magnetic conductor (iron core). And the coil on the receiving end is placed in two separate devices. When the power is input to the coil on the transmitting end, a magnetic field is generated. When the magnetic field senses the coil on the receiving end, a current is generated, so we build a set of radio energy transmission. system. Because we have removed the middle conductor, the magnetic field weakens rapidly with distance, and the distance that energy can transmit is very short. , Generally only a few millimeters to a few centimeters can have a better transmission effect, so it can only be used in small power wireless charging devices.  Compared with the electromagnetic induction method, the electromagnetic resonance is much more distant than the electromagnetic resonance. Two coils with exactly matching specifications are used for electromagnetic resonance. After one coil is energized, a magnetic field is generated, and the other coil resonates, and the generated current can be lit. Light bulb or power transmission to the equipment.  At present, it can reach a transmission range of several meters, but because it is a divergent transmission method, the overall efficiency is not high, but the advantage is that it can transmit power to multiple devices at the same time, and has a certain degree of freedom in the horizontal position. However, electromagnetic coupling and microwave resonance are generally not favored. Electromagnetic coupling distance is limited, and the principle is similar to magnetic resonance, but there are not many supporters. However, microwave resonance current transmission power is too small. The principle is similar to WiFi signal transmission (in fact, WiFi signal The transmission of wireless signals can also be considered as an energy transmission method, because the energy is distributed in all directions and utilization is extremely weak. The difference between wireless charging and wireless power supply Well, before we understand the basic situation of wireless transmission, and then return to our question, where is the difference between wireless charging and wireless power supply?  Both of them essentially originate from wireless power transmission. We all know that power transmission refers to the technology of transmitting power from a power generating device to a receiving end without passing a cable. Nowadays, many people will mix wireless transmission, wireless charging, and wireless power supply. Together, although the boundaries between the three are not too clear, there are subtle differences among them.  From the perspective of our consumer use, we can understand this simply: Wireless transmission relies heavily on losing words. It focuses on the transmission of electricity. This is a process and a technology , Wireless power supply and wireless charging are two different ways of applying wireless transmission technology. Wireless charging The more important thing is to charge the energy storage device in the device. The key is to charge it. The object must carry the energy storage device or popularly speaking, the battery. At present, the significance and application scenario of wireless charging are more. In a relatively fixed position, the use of small battery charging equipment. Wireless power supply Wireless transmission equipment Deploying power transmission to electrical appliances The use of electrical appliances does not necessarily require the storage of electricity. More emphasis is placed on the ability to be able to use it on the fly (and of course charge the battery), and to provide power to remotely adjustable electrical equipment The significance of wireless power supply is to provide more power for household appliances, and to meet the requirements of true wireless power. It can be said that wireless power supply is more difficult than wireless charging and has a greater significance. Many people like to mix the three together and call it wireless charging. It is true that in the current environment, we are more exposed to wireless charging. But in the future, with the development of technology, we need to distinguish these areas under their respective application scenarios. open. Why wireless power is first used on the mouse  The current wireless-powered mouse (note the power supply) should be Razer's Mamba Superstar. The Logitech G903 PowerPlay combination and the Corsair DARK CORE wireless charging mouse kit are based on charging the internal batteries. Called wireless charging mouse, the mouse battery is charged first, and then the mouse will use the internal power of the battery, and will not directly use the power provided by the wireless charging mouse pad. The use of wireless power for the first time on the mouse is actually very easy. The first is because of the low power consumption of the mouse , Do not need high-power wireless transmission, so the current wireless transmission technology can meet the power requirements of the mouse. The second reason is that mouse pad is a must The mouse pad as an essential item for mouse use is placed on the desktop and does not add extra space. The third is the short supply distance The mouse is in intimate contact with the mouse pad during use. At most, the number of seconds you raise your hand is a few centimeters at most. This range of mature electromagnetic induction can fully meet the demand.  The low-power devices do not have to deal with heat dissipation. We currently see cooling holes in many wireless charging devices, and even some wireless charging devices have internal air-cooled heat dissipation. This is a problem with small-power products like the mouse. Not at all. PConline Summary In the future, on the terminal equipment, wireless power supply will have a bigger stage. Not all load appliances will be equipped with batteries, and it is not practical. High-power charging, such as electric car charging, is still a wired charging method. Wireless The use of the power supply environment is also much wider than the wireless charging, of course, the technical difficulty is also very high, but I believe the future can be expected. 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