.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.
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. The wireless charging coil is suitable for short wave and medium wave circuits, and its Q value can reach 150-250, and has high stability.
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. 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.
In the range of ravg 0~0.08 m, the output power increases first and then decreases with the increase of coil turns; The ravg is 0.08~ 0.4mWith the increase of coil turns, the output power first decreases, then increases and then decreases. For a fixed operating frequency, the quality factor Q mainly depends on the shape and size of the coil and the material used.
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. In summary, Keysight E4980A/AL precision LCR table with its high precision, wide impedance range, fast measurement and multi-fixture selection, has become the ideal choice for wireless charging system coil test, to ensure the high efficiency and high reliability of the system provides a strong support.
The resistance value of the inductor under test is zero, and there is a short-circuit fault in it. The size of the DC resistance value of the inductor under test is directly related to the enamelled wire diameter and the number of coils wound. As long as the resistance value can be measured, the inductor under test can be consideredIt's normal. Note: If you need to determine accurate inductance and resistance values, please use special inductance testing instruments such as: impedance tester, LCR tester, digital bridge, etc.
Notes for winding coils mainly include the selection of coils with different frequency characteristics, the selection of magnetic cores of different materials, and the consideration of parameters such as inductance and distributed capacitance of the coil. In the wireless charging receiving coil, according to its working characteristics in the audio segment, passSilicon steel sheet or permalloy is often used as the core material.
Finally, after confirming, put the phone on the wireless charger, the charging prompt will be displayed, and it is OK. Precautions for wireless charging: Do not place metal objects, magnetic stickers, magnetic cards and other foreign objects between the mobile phone and the wireless charger (such as the car magnetic bracket iron attached to the back of the mobile phone). The mobile phone may not be charged properly or be damaged due to overheating. Place the mobile phone correctly. If the wireless charging coil deviates too much, the charging efficiency may be low or it cannot be charged.
First of all, according to the needs of the circuit, select the winding method: First of all, determine the size of the inner diameterSmall. Then according to the inductance value and resistance and other factors to determine the coil layer number, 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.
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 go to modify wireless chargingBase.