The technology refers to the efficiency in a wireless charging system that can be converted from a power source to electrical energy and transmitted to the target device. The efficiency is mainly determined by the energy loss in the energy transmission process. Usually, the conversion efficiency of wireless charging systems is between 60% and 80%, which means that 20% to 40% of the energy is lost during the energy transmission process. Considering the different environment, equipment and technology, the conversion efficiency of wireless charging systems will also be different.
Low efficiency magnetic resonance wireless charging technology conversion efficiency is generalOnly about 70%, compared with wired charging efficiency is low. Magnetic resonance wireless charging technology requires the establishment of a magnetic field between the transmitting end and the receiving end for energy transmission, but the formation and maintenance of the magnetic field requires a lot of electric energy, and a certain amount of electromagnetic radiation will be generated during the transmission process.
Charging efficiency: In the case of the same charging time, the commonly used wired battery charger after charging is 93%, and the wireless charger after charging is 88%. Obviously, there is still a gap in the charging efficiency of wireless chargers, and there is still room for further improvement in technology.
The loss of components affects the internal resistance of wireless charging fast and slow components, and the conversion efficiency of the system is high. The selection of components such as triode with small internal resistance can greatly improve the efficiency of wireless charging. However, with low internal resistance, the cost will be relatively high.
GND is ground. The common negative electrode. This stuff improves efficiency. One, coil material. Two-wire structureDue to the skin effect of high frequency conduction, the effective conductive area is reduced. Therefore, the coil can be wound with multiple strands of wire (insulation between wires). Three use low voltage drop diodes. Fourth, the electromagnetic wave is attenuated by the square of the distance, so the closer the distance, the higher the transmission efficiency.
Then, the existing several charging methods are listed, slow charging, fast charging, wireless charging, power station change. The four kinds of high charging efficiency are fast charging pile (supercharging pile), which can obtain hundreds of kilometers of battery life in a short time; The most efficient mode, but the scope of application is limited, is the power station. These two efficient replenishment mainstream modes can not be replaced by wireless chargingYes.
Only one way is feasible, is to reduce the switching time of the power device. Other methods, such as the use of lower resistance coils, lower resistance power devices, are not as good as the above method. This is what I discovered during development.
1, wireless fast charge is not very fast, nor very slow. Wireless fast charge is much faster than wireless fast charge, and slower than wired fast charge. The power of the charging head wired output to the wireless fast charging base is not the wireless fast charging output power but wireless fast chargingInput power. Charging time of more than 2 hours of wireless fast charge, not as fast as the wired fast charge of 1 hour and 30 minutes, is not fast charge. Unexpectedly, the wireless fast charging efficiency of 60% when the 18W is charged for 2 and a half hours. 2, in general, the conversion efficiency of car wireless chargers is limited, but by reasonable choice of chargers, we can improve the situation. Although the speed of wireless fast charging is not fast, it is not too slow, and consumers should pay attention to the power and actual charging efficiency of the charger when purchasing. Many people worry about the harm of electronic equipment to the human body, but in fact, this is not neededWorried, the closed magnetic field is very safe, will not interfere with the mobile phone signal, and low temperature fast charge function, charging will not heat. Of course, the most important thing is the charging effect, wireless charging although relatively slow, but the effect is still very stable.
4, although some people worry that wireless fast charging will damage battery life, but in fact, wireless fast charging itself will not. Battery life is affected by a variety of factors, such as faulty charging habits (excessive discharge and frequent charging), high temperatures, and non-compliant charging devices. Lithium batteries have no memory effect, and appropriate "use with charge" is beneficial to battery health.
Advantages of wireless charging: one: reduce loss. As we all know, when using wireless charging, you only need to connect the wireless charging board to the power supply, and then place the device that supports wireless charging on the wireless charging board. Although wireless charging still needs to be connected to the power supply, it can reduce the use of data lines and avoid a large amount of loss and waste of data lines, which is relatively an environmentally friendly charging method. Two: high adaptation rate.
The advantages of mobile phone wireless charging are convenience, flexibility, protection interface, and the disadvantages are low charging efficiency, slow charging speed, and costHigh. Benefits Convenience: Wireless charging of mobile phones eliminates the hassle of using a charging cable. Users only need to place the phone on the charging dock, without plugging or unplugging the charging cable, to start charging. This makes the charging process easier and faster. Flexibility: Wireless charging eliminates the need for a specific charging cable.
The advantages of wireless charging are: reduce loss, high adaptation rate, the disadvantages are: the distance is too small, but the transition technology; The benefits of wireless charging reduce the loss. It is well known that when using wireless charging, you only need to connect the wireless charging board to the power supply first, and then wireless charging will be supportedThe device can be placed on the wireless charging pad.
1, wireless charging Wireless charging efficiency efficiency is lower than wired charging wireless charging efficiency , but in the future wireless charging efficiency , With the rapid progress of wireless charging technology Wireless charging efficiency , it is likely to be chargedElectrical efficiency compared with wired charging is better. However, at present, the technology of wireless charging is not advanced enough, so the charging efficiency of wireless charging technology is lower than that of wired charging. At this stage, wireless charging is more as a supplement and auxiliary to wired charging.
2, wireless fast charge is not very fast, nor very slow. Wireless fast charging is much faster than wireless fast charging Wireless charging efficiency is slower than wired fast charging. The power that the charging head wired outputs to the wireless fast charge base is not the wireless fast charge output power but the wireless fast charge input power. Charging time is 2 smallWhen the wireless fast charge is more than 1 hour and 30 minutes as fast as the wired fast charge, it is not a fast charge. Unexpectedly, the wireless fast charging efficiency of 60% when the 18W is charged for 2 and a half hours.
3, charging efficiency: in the case of the same charging time, the commonly used wired battery charger after charging is 93%, and the wireless charger after charging is 88%. Obviously, there is still a gap in the charging efficiency of wireless chargers, and there is still room for further improvement in technology.