1, wireless charging coil test good or bad method is as follows: test the resistance value of the coil, resistance value within a certain range is a good product. Test the Q value of the coil, the higher the Q value, the better the performance. Test the coil temperature rise, the lower the temperature rise, the better the performance. Test the efficiency of the coil, the higher the efficiency, the better the performance.
2, wideThe 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. The E4980A/AL has a wide impedance range from 4 milliohm to 100 milliohm, and can cover this band with 10% accuracy, making it particularly suitable for the precise evaluation of wireless charging coils.
3, the secondary winding is broken, the wireless charging coil has two windings, one is the main winding, one is the secondary winding, after the secondary winding is damaged, it will cause the main winding to heat, and the output has no voltage.
4, wireless chargingThe coil tests the capacitance of the coil to the ground because the capacitor is a substance that converts electric field energy and magnetic field energy. In the process of wireless charging, electric field energy and magnetic field energy need to be converted. The process of wireless charging is the transmission of electric energy from the charging device to the receiving device.
5, the size of the current and the thickness of the coil is related to the frequency. Look at the specific circuit, sometimes when the difference in inductance value is not large, the impact on the output voltage and current is not obvious, but it may lead to a large difference in the change in unit period voltage/current, and also lead to the difference in loss and efficiency, so the choice of inductor is reasonable at this timeCharge coil Q value parameter. "Q" stands for "Quality Factor". The coil passes direct current wireless charging coil Q value , but the resistance acting as alternating current wireless charging coil Q value is called inductive reactance. The higher the frequency of alternating current, the higher the inductive reactance. To calculate the Q value of the coil, use the following formula Wireless charging coil Q value : Another factor that affects the Q value is the substrate. The coil may have a substrate made of ferrite or ceramic material.
Q value; It is the main parameter to measure the inductance device. It is the ratio of inductive reactance to equivalent loss resistance when the inductor is operating at a certain frequency of AC voltage. The higher the Q value of the inductor, the smaller the loss and the higher the efficiency. The quality factor of inductor is related to the DC resistance of coil wire, the dielectric loss of coil skeleton and the loss caused by iron core and shield.
The resistance value of the measured inductance is too small. The internal coil of the inductor has a short circuit fault. Pay attention to the test operation, be sure to carefully zero the multimeter first, and carefully observe whether the position of the pointer swinging to the right really reaches zeroTo avoid miscalculation. When it is suspected that there is a short circuit fault inside the inductor, it is best to use the r×1ω block to measure repeatedly several times, so as to make a correct judgment. (2) The resistance value of the measured inductance.
Inductance calculation formula: impedance (ohm) = 2 *π * F (operating frequency) * inductance (mH), set with 360ohm impedance, so: Inductance (mH) = impedance (ohm) ÷ 2π ÷ F (operating frequency) = 360 ÷ 2π ÷ 06 = 116mH.
The Apple XR supports up to 18W of fast charge. In detail, while the original charger of the Apple XR is only 5W, the phone itself supports the use of higher power chargers for fast charging. By using a charger and cable that supports the USB-PD protocol, the Apple XR can achieve up to 18W of fast charge power. This fast charging technology can charge more power to the phone in a short time, which is greatly convenient for users to use.
iPhone XR supports 18WPD fast charge, charging peak up to 18W, (Note: charging power will change with the change of electricity). Apple from iPhone8 and above series models support PD fast charge, just with PD charger C to L Apple PD fast charge cable can achieve fast charge effect (it is recommended to use the original or through the Apple MFi certified third-party fast charge cable).
The iPhone EXR is equipped with a 2942mAh battery, and the machine is standard with a 5WUSB power adapter. IPhone EXR support fast charge, it is recommended to use 18w, Apple xr fast charge maximum support 61w, can be iPThe official Apple chargers used by honeXr to support fast charging are Apple18W, 29W, 30W, 61W and so on.
Superconducting technology and wireless power transmission technology are very promising, and they are extremely valuable scientific and technological applications in the field of electromagnetism. However, the technical details of the two are very different, and it is not easy to compare. So I did a little research on wireless power transmission during my master's degreeGuide jade to answer the wireless transmission technology, looking forward to someone to supplement the various details of superconducting technology.
Superconducting power: superconducting transmission, superconducting energy storage, superconducting current limiting, superconducting motor, etc. The current superconducting technology is actually more suitable for application in DC above, there is AC loss when AC, and now the proportion of direct current in power transmission and electricity is increasing, which is related to the increase in power consumption of computers and big data centers. Therefore, we are optimistic about the prospect of superconducting technology in DC power transmission.
For now, superconducting technology and wireless power transmission technology are the cutting-edge technologies of current science and what exists is science and technologyThe focus of development. Because the two technologies are closely related to our lives and are revolutionary, they are so compelling. Let's take a look at these two technologies now.
1, the main parameters of the inductor device. Wireless charging q value is the main parameter of inductive devices, wireless charging technology is completely without the use of wires, the use of magnets to charge the device technology. Wireless charging technology, derived from wireless power transmission technology.
2, wireless charging coil test is good or bad as follows:Test the resistance value of the coil, resistance value within a certain range is a good product. Test the Q value of the coil, the higher the Q value, the better the performance. Test the coil temperature rise, the lower the temperature rise, the better the performance. Test the efficiency of the coil, the higher the efficiency, the better the performance.
3, the Q value is a parameter indicating the quality of the inductance. "Q" stands for "Quality Factor". The coil passes direct current but acts as a resistor for alternating current, called inductive reactance. The higher the frequency of alternating current, the higher the inductive reactance. To calculate the Q value of the coil, use the following formula: Another factor that affects the Q value is the substrate. Coils can be made of ferrite or ceramic materialsThe base plate.
4, wireless charging coil is suitable for short wave, medium wave loop, its Q value can reach 150-250, and has high stability. After the wireless charging coil is energized, a magnetic field is formed around it, and it is made into a spiral shape, the more the number of turns, the greater the magnetic field range, the more electricity passed per unit time, the stronger the magnetic field, according to the skin effect of the current, the thick line can be replaced with more thin lines to get a stronger magnetic field.