There are four basic principles of wireless charging, respectively, electromagnetic induction charging, magneticField resonance charging, radio wave charging, electric field coupling charging, the mainstream standards on the market mainly include Qi standard, PMA standard, A4WP standard, iNPOFi technology and Wi-Po technology. Let's take a look at the principle of wireless charging.
At present, there are four main technical ways to achieve wireless charging: magnetic induction technology, magnetic resonance technology, microwave technology and electric field coupling technology. Among them, magnetic induction technology and magnetic resonance technology are the technologies that are basically used in the current mass production products.
Radio wave type. This is the development of more mature technology, classSimilar to the early use of ore radios, mainly composed of microwave transmitters and microwave receivers, can capture the radio wave energy bouncing off the wall, while adjusting with the load while maintaining a stable DC voltage. This method requires only a transmitter mounted in a wall plug and a "mosquito" receiver that can be installed in any low-voltage product.
Electromagnetic induction charging, very simple, and the principle of electromagnetic induction in high school is similar, wireless charging the charging base and the terminal are built with coils, so that the two are close to the charging seat and start to supply power from the charging seat to the terminal. A lot of wirelessly charged phones areThis principle, but the position must be relatively uniform in order to charge efficiently. And there is also coupling radiation problem, electromagnetic wave coupling will not exist a large magnetic field leakage.
Convenient: no need to connect with a wire when charging, as long as it is placed near the charger. Technically, a charger can power multiple electrical devices, and in the case of multiple electrical devices, it can save multiple chargers, do not occupy multiple power sockets, and there is no trouble of multiple wires winding each other.
The main parameters of dynamic wireless power supply technology include power transmission distance, power, efficiency, and side shift of coupling mechanism
1, USB charging treasure emergency Many people will carry USB and mobile power. We connect the USB cable to the USB power port of the smart door lock, and then connect the other end to the mobile power supply to provide emergency power to the door lock. Enter your fingerprint or code, and you'll open the door.
2, you can use USB emergency power supply, the general smart password lock is out of power, you can use USB to charge. At the lower end of the front panel of the combination lock, there will be a USB power supply hole, which can be opened by borrowing a series of mobile power devices such as a charging bank for emergency power supply. To prepareAn emergency mechanical key can open the door through the backup of the emergency mechanical key, the general smart code lock will leave a keyhole, in the case of no electricity, you can use the emergency mechanical key to open the door.
3, electronic lock out of power, how to do? Here are two ways to open the door. If you carry a charging treasure with you, then we can find a power supply hole with usb in the lower part of the front panel of the electronic door lock, where you can use a charging treasure or other usb devices for emergency power supply, so as to open the door.
4, some smart locks can be charged by external power emergency, such as external power supply (9V battery or Micro USB connected charging bank) temporarily power the system to let the user open the door first, and then replace the battery as soon as possible. Emergency battery box can use the emergency battery box, first installed in the inside of the four five batteries, and then the emergency battery box inserted into the emergency battery box jack of the combination lock, and then the electronic lock is opened, and then replaced with the normal use of the battery in the cabinet door.
1, in addition, the characteristics of millet's space charging is that the distance is farther and because the number of mobile phone receiving antennas is large, even if it is handheld or placed in the trouser pocket, it can be charged within a few meters. You can imagine installing a few of these charging piles at home or in the office, basically you can really get rid of wired charging. In terms of power, each device can achieve 5W charging power, and it will not lose power because of more devices.
2, space charging is a good solution to this problem, space charging is a littleLike the WiFi we use today. As long as you take your mobile phone into a place or area with a space charging device, you can charge it while playing. It can be said that the charging experience of the mobile phone is extreme.
3, space charging technology is actually the expectation of the public, and it is also a necessary prerequisite for the development of science and technology in the future. If air charging really will be popular, it will be a landmark invention, imagine going anywhere without taking the charger, there is no need to worry about the problem of battery life, charging cars can even no longer worry about the problem of battery life.
1, electromagnetic induction: simple and efficient close contact electromagnetic induction, like a pair of tacit understanding of the dancer, the sending end and the receiving end through the induction of magnetic flux transfer power. It is known for its simple structure, high efficiency and low cost, and is especially suitable for close-range device charging. However, it also has limitations, limited transmission distance and strict location requirements, requiring accurate alignment to charge, as shown in Figure 4-1.
2, the principle of wireless charging in the popular sense of the understanding is somewhat similar to the transformer, the transformer magnetic field coupling circuit is a magnetic conductor, noThe circuit of line charging magnetic field coupling is only air, and the magnetic medium is different. Wireless charging in the industry generally has four major technologies: magnetic induction technology, magnetic resonance technology, microwave technology and electric field coupling technology. The main technologies are magnetic induction technology and magnetic resonance technology.
3, the principle of wireless charging The principle of wireless charging is to transfer energy to the device that needs to be charged through electromagnetic induction or electromagnetic radiation. Specifically, wireless charging is divided into two ways: electromagnetic induction and electromagnetic radiation. Electromagnetic induction: Through the principle of electromagnetic induction, the current at the transmitting end is converted into a magnetic field, and then the energy is transferred to the magnetic fieldAt the receiving end, the energy is converted into current, thus achieving wireless charging.
4, mobile phone wireless charging system mainly adopts the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to supply power to the system directly. Wireless charging technology is a special way of power supply, it does not need the power line, rely on electromagnetic wave propagation, and then the electromagnetic wave energy into electricity, and finally achieve wireless charging.
5. Currently using Qualcomm Snapdragon S4 processor and Fatboy NoneLine rechargeable battery with 2000 mAh capacity. Nokia has always advocated unique experiences, and Nokia's map positioning, music and other features are the main differentiating applications. The power consumption challenge of high-frequency use is also the driving force behind Nokia's improved battery charging technology. At the same time, in the exhibition, the Windows P8 used by the Lumia 920 can share information such as photos with Windows 8.
6, S6 built-in wireless charging coil, support wireless charging function. You need to purchase a wireless charging dock separately, and you can easily charge your phone wirelessly by simply placing it on a compatible charging dock.