2, the principle is through the use of the magnetic field generated between the coils, generate current, for transmission.
3, mobile phone wireless charging system mainly uses electricityMagnetic induction principle, through the coil energy coupling 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.
4, charging base: ensure that the wireless charger or charging base used is compatible with your Huawei mobile phone, and supports the Qi wireless charging standard. Normally, you can sell on Huawei's official website or related third partiesThe signal transmits energy, wirelessly connects the charger to the phone, and transmits energy to the phone for charging. Inductive charging: This technology transmits energy through inductive electromagnetic fields, and there needs to be a certain distance between the phone and the charger, and the phone can be charged wirelessly if the charger is placed within a certain range.
electromagnetic induction type. A certain frequency of alternating current in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end.
There are four basic principles of wireless charging, which are electromagnetic induction charging and magnetic resonance chargingRadio wave charging, electric field coupling charging, the mainstream standards on the market are mainly Qi standard, PMA standard, A4WP standard, iNPOFi technology and Wi-Po technology. Let's take a look at the principle of wireless charging.
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.
1, Redmi K40 as a new mobile phone launched by Xiaomi, its wireless charging function attracts attention. Officially confirmed that Redmi K40 supports Qi standard wireless charging, just put the phone on a compatible wireless charger, you can achieve easy wireless charging, while it also supports 33W wired fast charging, both convenient and efficient.
2, Redmi K40 mobile phone support wireless charging function, in order to use this function, need to use with wireless charging base. First, make sure the wireless charging dock is connectedPower, and the phone is placed in the correct position of the base, so as to ensure that the phone begins to wireless charging. Then, go to your phone's Settings options.
3, although the Redmi K40 supports wireless charging, there are still some things to pay attention to during use. First of all, because the efficiency of wireless charging is relatively low, it is recommended that users place the phone on a compatible wireless charger and keep it still when wireless charging to ensure the efficiency and stability of charging. In addition, users also need to pay attention to the distance between the wireless charger and the phone, as well as the power stability of the charger.
4, Red rice k40 can not be wireless charging. Because the Redmi k40 doesn't have wireless charging. Its built-in 4520mAh battery only supports 33W wired charging, no wireless charging and reverse charging. So the phone can only be charged with cable.
5, Redmi k40 does not have wireless charging. Its built-in 4520mAh battery only supports 33W wired charging, no wireless charging and reverse charging. Some media have tested the battery life of the Redmi k40, using the Bilibili client to play online barrage videos, silent, 75% brightness. Based on what's been monitoredCurrent information estimates that the Redmi k40 can reach about 12 hours of online video life under test conditions.
6, the most serious drawback of Redmi K40 is that there is no wireless charging, and the wired charging rate is only 33 watts. The Redmi K40 is a good value phone, but it has some drawbacks, the most serious being the lack of wireless charging, which may be an important consideration for some users. In addition, the wired charging rate is only 33W, which is relatively slow compared to some other flagship phones, which may affect the user's charging experience.
Generally about 0.9-2 meters high-power wireless charging A wide range of wireless charging transmission distance up to 5 meters Wireless charging technology can be divided into low-power wireless charging and high-power wireless charging two ways. Small power wireless charging often uses electromagnetic induction large range wireless charging , such as the Qi method of charging mobile phones, but ZTE's electric vehicle wireless charging method is adoptedThe induction type used.
The distance is greater than 10 cm, and the conversion efficiency is only about 60%, that is, the sent power is 1000W, and the received power is only 600W.
If the charging efficiency is relatively normal and harmless to the human body, the farthest distance that can be done now should be 5-10cm, and the domestic micro goose technology and Qualcomm should be able to do it. And this is not the public familiar with Qi wireless charging, is magnetic resonance wireless charging, based on the principle of magnetic resonance. Although there are also 1 meter or even farther wireless charging technology, but the current charging power of these are too small, charging speedToo slow to put into daily use.
The core magnetic resonance medium and long distance wireless charging developed by Spurotin can successfully achieve wireless charging within one meter.
Generally about 0.9-2 meters high-power wireless charging transmission distance up to 5 meters wireless charging technology can be divided into low-power wireless charging and high-power wireless charging two ways. Low-power wireless charging often uses electromagnetic induction, such as the Qi method of charging mobile phones, but ZTE's electric carInductive car wireless charging method.
The core magnetic resonance medium and long distance wireless charging developed by Spurotin can successfully achieve wireless charging within one meter.
Wireless charging distance mobile phone and charger can not leave more than 10cm, the closer the effect is better. Wireless charging technology has always been only related to "small" mobile devices such as smartphones and small-size tablets. However, one of the three major wireless charging camps, A4WP (" Wireless charging Alliance "), recently announced that its technical standards have been upgraded, and the charging power supported has increased to 50 watts, which means notebook computers and tabletsSuch high-power equipment can also achieve wireless charging.