1, single coil: A11, A11a, MP-A2; 2) Multi-coil: A28 A28, MP-A13. Single coil multi coil Qi certification according to the product can be divided into the following three categories: 1) charger products; 2) Mobile power supply products; 3) Embedded device (product contains TX transmission function).
2, Qi certification process is rigorous to ensure product compatibility and safety. Qi-BPP and EPP correspond to different power coil types respectively, while Qi-MPP introduces new technical features such as higher operating frequencies and communication schemes. The WPC Council actively promotes the standard update, and the certification of Qi2 is in progress.
3, QI certification is not mandatory certification, but Qi certification is also right and wrongIt is important that products using the Qi standard undergo rigorous testing to ensure their safety, interoperability and energy efficiency. Only products that have passed independent laboratory testing can use the Qi mark and are considered to be "Qi certified" products.
1, the most used is Ti's chip, about 12. There are many options for launch, and we're one of them.
2, wireless charging PCB, different functions, the required components are different. The required components are: Resistor, capacitor, resonant capacitor, resonant coil, MOS tube, control chip, protocol chip.
3, the realization of wireless charging function requires a wireless transmitter module and receiving module, and now the new mobile phones launched by the major mobile phone brands on the market have built-in wireless charging receiving module, some mobile phones without built-in receiving module need an external receiving chip, the use of the receiving chip is also very simple (plug into the mobile phone charging port); The wireless charger needs to be connected to the power supply, but the phone can be placed on the wireless charger for wireless charging of the phone.
4, iPhone11 asApple's flagship iPhone11 also supports wireless charging, but relative to domestic mobile phones, the charging rate may be slower, but other aspects are still very strong, such as iPhone11 has a variety of different colors to choose from, but also the new addition of green and purple, very small and fresh.
5, wireless charging requires a chip built into the device to receive electromagnetic waves and electromagnetic fields, and nova8 does not have this chip. In addition, wireless charging is not as efficient and fast as wired charging, so it may not be necessary for all users. nova8 is currently concurrentIt does not support wireless charging, but it does support 40W wired fast charging, which can be quickly charged in a short time. If you need wireless charging, you can choose other mobile phones that support wireless charging.
6, xr wireless charging does not need to be set, after connecting the charger to the power supply, the phone is placed horizontally on the charger, waiting for the screen to light up wireless charging is successful. The iPhone ExR is a smartphone designed, developed and marketed by Apple Inc., and was unveiled at the Steve Jobs Theater Fall event on September 13, 2018 at 1:00 am Beijing time.
The number of wireless charging coils is based on the number and size of the device to be charged by the charging device. In theory, the more coils there are, the more efficiently the device can be charged, because the device can receive the charge at any location. However, if the number of coils is too large, it will increase the cost and volume, which is not practical or economical. Therefore, the appropriate number of coils should be selected according to different charging needs.
No. Each wireless charging coil will have a certain amount of energy loss, and increasing the number of coils will result in overall chargingThe electrical efficiency decreases, and more coils will increase the energy loss and mutual interference, thus reducing the efficiency of wireless charging; And increasing the number of coils requires more coils and associated circuits to be installed in the device, which increases design complexity and cost.
Magnetic resonance charging, the principle is the same as the resonance principle of sound. Coils of the same vibration frequency arranged in a magnetic field can exchange energy with each other. If the coil is large enough, long-distance transmission is also possible, but high efficiency, miniaturization is more difficult.
According to the principles of physics, the stronger the electromagnetic coil, the stronger the magnetic field will be emitted, and then follow the handThe reception of the machine is also related, the stronger the magnetic field, the stronger the charging ability will be.
Wireless charging base to increase the coil, or do not modify it, you increase the coil not only did not play a good effect but affect the speed of charging, increase the coil is equal to increase the resistance, it will make the current slow, the coil is proportionally wound, too much or too little can not, coil wound less, there will be damage to the parts, resulting in parts burned spark, For some do not arbitrarily modify the wireless charging base.
is the greater the inductance. The larger the wire diameter, the smaller the resistance. These are designed to reduce the current if you increase itThey're small.
.85 euros. According to the query of X technology, the internal resistance of wireless charging coil is 0.85 euros. Wireless charging technology comes from radio energy transmission technology, which can be divided into two ways: low-power wireless charging and high-power wireless charging. Low-power wireless charging often uses electromagnetic induction.
Wide impedance range, to adapt to a variety of needs The inductance of the wireless charging coil is usually at the micro hen level, and the test frequency is in the kHz range, which requires a wide and accurate measurement range. E4980A/With a wide impedance range from 4 milliohm to 100 milliohm, AL can cover this band with 10% accuracy, making it particularly suitable for the precise evaluation of wireless charging coils.
Then according to the inductance value and resistance and other factors to determine the number of layers of the coil, height, outside diameter and so on. Wireless charging coil is suitable for short wave, medium wave circuit, its Q value can reach 150-250, and has high stability.
In the range of ravg 0~0.08 m, the output power increases first and then decreases with the increase of coil turns; In the ravg range of 0.08~ 0.4m, output powerThe rate decreases first, then increases and then decreases with the increase of coil turns. For a fixed operating frequency, the quality factor Q mainly depends on the shape and size of the coil and the material used.
The mobile phone wireless charger is probably about 50mm in diameter of the mobile phone end coil, the charger end is about 46 to 48mm in diameter, because of different mobile phone models may vary, but the best transmission method is the mobile phone end and the charging end coil size is the same.
Wireless charging base to increase the coil, or do not modify it, you increase the coil not only did not play a good effect but affect the speed of charging, increase> What are the wireless charging concept stocks? Hengdian Dongmagnetic (002056) : Soft magnetic materials supply to Apple wireless charging field iwatch products. Jinsheng Precision (300083) : The company has a wireless charging structure related patents, and is developing wireless charging ceramic battery cover technology. Klik (002782) : On the interactive platform, it said that it has the technical reserve of wireless charging, and will actively carry out the strategic layout and seize the opportunity to enter the market.
What are the wireless charging concept stocks? Qingdao Haier (600690) : Haier "tailless TV" was adopted with MITThe collaborative wireless power transmission technology, which can transmit power to the TV without the use of wires, is the first successful application of wireless power transmission technology in TV receiving terminals.
Apple wireless charging concept stocks are: Hengdian East Magnetic (002056) : Hengdian East Magnetic said on the interactive platform on September 6, 2017 that the company currently provides wireless charging disks to Apple.