And just recently, the Ministry of Industry and Information Technology issued a provisional provision, its full name is "Wireless charging (power transmission) equipment radio management interim provisions (draft for comments)", the provisional provisions on the wireless charging rated transmission power requirements is less than 50W.
The Ministry of Industry and Information Technology stipulates that the power of wireless fast charge must be less than 50 watts, there are such requirements in the end whyThey are not very clear, but what they know is the limit, the power of this charge is not because of radiation, because radiation is everywhere, all the time, and not all radiation will have an impact on the human body.
This document clearly states that since January 1, 2022, the rated transmission power of mobile and portable wireless charging equipment should be less than 50W. In other words, millet 120W wireless second charge is not supported by the Ministry of Industry and Information Technology. The Ministry of Industry and Information Technology does not support it, not because the wireless second charge itself has any security hiddenTrouble.
But just now, the Ministry of Industry and Information Technology suddenly came out with new news. From next year, the power of mobile wireless charging equipment will be less than 50W, which also seems to reflect the wireless fast charging technology of mobile phone products will be limited. Mobile phone wireless fast charge may be the highest will also be fixed at 50W, of course, there is certainly a reason for such restrictions.
Some time ago, Xiaomi released its own space charging technology, the power is 5W, from the millet promotional video can be seen, such technology is indeed very science fiction, but may not be able to use in the country. Just today, the Ministry of Industry and Information Technology issued a reportThere is no need to use a traditional charger and cable. This technology is based on the principle of electromagnetic induction, by wirelessly transmitting electrical energy to the device to charge. When the internal charge of the device is full, the excess power is reversely transmitted back to the charger.
2, two-way fast charge means that both output and input support fast charging; The output supports fast charging, that is, when the charging treasure charges the mobile phone, the charging treasure and the mobile phone support fast charging, and the input supports fast charging, that is, when the charging treasure charges the charger and the charging treasure support fast charging. At present, the charging speed is generally 5V, 2A is the base benchmark, charging power exceeds 5V, 2A areThe concept of fast charge is also divided into two directions of pulling high voltage and increasing current in principle.
3, fast charge protocol: PD QC fast charge power: 10W wireless 18W wired This South Carolina wireless charging treasure battery capacity is 10000 MA, support QC18W and PD18W wired fast charge function, also support 10W wireless fast charge function. The South Carolina wireless power Bank POW2 uses a triple heat dissipation design, whether it is wireless or wired charging will not be hot.
4, wireless fast charging is a combination of wireless charging technology and fast charging technology, and the mainstream models on the market are nowSupport wireless fast charging technology. Wireless fast charging mobile phones are Xiaomi Huawei P40, Mate30, Mate30 pro and so on. Wireless charging technology Because the charger and the electrical device transmit energy by magnetic field, the two are not connected by wires, so the charger and the electrical device can be no conductive contact exposed.
5, November 25 news, this afternoon Huawei officially released its new MatePad Pro tablet computer, Yu Chengdong mentioned when introducing this tablet computer, this tablet is the first two-way wireless charging tablet. Huawei MatePad Pro YesThe world's first two-way wireless charging tablet, equipped with 7250mAh large-capacity battery, support 40W super fast charge 15W forward wireless fast charge, 5W reverse wireless fast charge technology.
6, wireless fast charging is a convenient charging technology. Wireless fast charge through magnetic resonance, electromagnetic induction and other technologies to achieve wireless charging function. Compared with traditional wired charging, it does not need to connect the cable between the phone and the charger, just place the phone on the charger to start charging. This technology eliminates the trouble of plugging and unplugging the data cable when the user is using the phone, and brings a more convenient and efficient charging experience to the user.
Apple iPhone: Starting with the iPhone 8, Apple's mobile phones support wireless charging. You can use the Qi standard charger or charging pad to charge the iPhone, which is very convenient. Samsung Galaxy: Most phones in the Samsung Galaxy series support wireless charging.
Mobile phones that support wireless charging are: Huawei Mate 40E Pro, Huawei P50 Pro, Huawei Mate 40E, Huawei Mate 40 Pro, Huawei Mate 30 Pro, Huawei Mate 20 Pro, Huawei P40 Pro, etc.
There are many mobile phones that support wireless charging. At present, flagship phones of major brands such as iPhone 11 and above, Samsung Galaxy S2, Huawei Mate 30 Pro and Mi 11 have built-in wireless charging function. In addition, some other brands of mobile phones such as LG, Sony, OnePlus and other models are also equipped with this function.
As of December 12, 2019, HUAWEI has the following mobile phones supporting wireless charging: HUAWEI Mate 30 5G, HUAWEI P30 Pro, HUAWEI Mate 20 Pro (UD), Huawei Mate RS Porsche Design.
NoneThe way of line charging is electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. Most of the wireless charging of mobile phones uses the principle of electromagnetic induction. Electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger's power supply coil) will generate a magnetic field, other unenergized coil (mobile phone side of the electric coil) close to the magnetic field will generate current, charging the mobile phone.
The main principle of wireless charging is the electromagnetic induction principle. It is charged in a non-contact manner, transferring electrical energy by generating a magnetic field between the charger and the device being charged. Wireless charging is explained in detail belowPrinciple. Wireless charging technology is mainly based on the principle of electromagnetic induction. Specifically, when the AC magnetic field is generated on the charger, the electric energy is transferred to the device through the action of the magnetic field, and the wireless power supply is realized.
Electromagnetic induction: The fundamental principle is to use the principle of electromagnetic induction, similar to a transformer, the primary coil of a certain frequency of alternating current, through electromagnetic induction in the secondary coil to produce a certain current, thereby transferring the energy from the transmission end to the receiving end. The conversion efficiency is high, the cost is cheap, but the transmission distance is short, and it is easy to be affected by the placement.
Wireless charging mobile phone principle is: electromagnetic induction principle,Electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger's power supply coil) will generate a magnetic field, other unenergized coil (mobile phone side of the electric coil) close to the magnetic field will generate current, charging the mobile phone.
The principle of wireless charging is that through near-field induction, the wireless charging device conducts energy to the charging terminal device, and the terminal device converts the received energy into electrical energy and stores it in the battery of the device. The principle of energy conduction is inductive coupling, which can ensure that there is no exposed conductive interface, which can not only eliminate the messy transmission line between the equipment, but also frequently interact with liquid such as electric toothbrushesElectronic devices in contact with conductive media such as body are safer.