1.85 euros. According to the query X technology, the internal resistance of the wireless charging coil is 0.85 euro, wireless charging technology comes from radio energy transmission technology, can be divided into low-power wireless charging and high-power wireless charging two ways, low-power wireless charging often uses electromagnetic induction.
2, wide impedance range, to meet a variety of needs of the inductance of the wireless charging coil is usually at the micro hen level, 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, and then according to the inductance valueFactors such as resistance determine the number of layers, height, and outside diameter of the coil. Wireless charging coil is suitable for short wave, medium wave circuit, its Q value can reach 150-250, and has high stability.
4, in the range of ravg 0~ 0.08m, the output power increases first and then decreases with the increase of coil turns; In the range of ravg 0.08~ 0.4m, the output power decreases first and 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.
I just bought a double coil, the mobile phone does not need to be put on the whole, horizontal and vertical can be put. But the single coil must be aligned with the phone to charge it.
General double coil nose single coil safety. Advantages: Increase the effective power to improve the ability to resist electromagnetic interference, reduce power loss, reduce vibration with a better insulating paint, reduce the amount of copper material to increase the effective space.
Bex wireless charger: cost-effective, 15W charging, strong suction and user-friendly design, even game lovers can easily use. polyzygosisA style of three-in-one charger: 22W wireless fast charge, strong compatibility, dual core design to ensure low loss, intelligent heat dissipation makes charging more secure. Green Link 3-in-1 Charger: Compatible with Apple Watch, iPhone and AirPods, the phone module swipes to provide an elegant desktop solution.
Charging method: Wireless Zikko Apple wireless charger compared with common wireless chargers on the market, it has the advantages of high 10W fast charging, multi-coil without aligning a fixed position, and all-round charging. Equipped with high 10W double coil wireless transmission power, compared to commonThe single coil, it does not need to be aligned to a fixed position when charging. It has three modes of horizontal and vertical placement, no matter it is horizontal, horizontal and vertical placement, it can truly achieve all-round charging.
I chose the best double head fast charge, one to pass, the green light is on after the mobile phone is absorbed, the blue light is shining when the headset is charged, the most surprising is that it supports magsafe magnet, convenient to check the mobile phone message. However, the overall use will be a little warm, but I can accept the range.
2, 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. To improve space utilization, the wire used in the coil is usually insulated enamelled wire.
3, due to the skin effect of the high-frequency signal in the wire, it means that the high-frequency current is guidedThe wire will converge to the surface of the wire, so the wireless charging coil generally uses a multi-strand enamelled wire to reduce the impedance.
4, same size. The same size and as close as possible, otherwise it will have no effect, low conversion efficiency.
5, wireless charger refers to the use of electromagnetic wave induction principle for charging equipment, the principle is similar to a transformer. There is a coil in the sending end and the receiving end. The sending end coil is connected to the wired power supply to generate an electromagnetic signal, and the receiving end coil senses the electromagnetic signal of the sending end to generate a current to charge the battery. The wireless charging system mainly uses the principle of electromagnetic induction and continuous energy coupling through the coilComplete the transfer of power.
6, this is similar to the principle of a single-phase transformer, that is, the AC coil produces the opposite magnetic field back and forth, when the receiving coil senses the magnetic field changes, the induced current is generated, and the received electrical signal can be charged by transformer rectification. It's kind of like that. It uses an induction coil.
1, wireless coil winding coil precautions mainly include the selection of different frequency characteristics of the coil, the selection of notThe magnetic core of the same material, as well as the inductance of the coil, distributed capacitance and other parameters are considered. In the wireless charging receiving coil, according to its working characteristics in the audio segment, silicon steel sheet or permalloy is usually selected as the core material.
2, Finally, after confirming, put the phone on the wireless charger, it will display the charging prompt, 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. Please place the mobile phone and wireless charging cable correctlyExcessive circle deviation may lead to low charging efficiency or inability to charge.
3. Yes. The operation steps are as follows: First, according to the needs of the circuit, select the winding method: First, determine the size of the inner diameter. 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.
4, wireless charger working principle Wireless charging system mainly uses the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. As shown in the picture, system workerThe input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V DC end to supply power directly to the system. After passing through the power management module, the output direct current is converted into high-frequency alternating current through the 2M active crystal oscillator inverter to supply the primary winding.
1, wireless charging has electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission and other methods, usually most of our mobile phone wireless charging is the principle of electromagnetic induction. Talk about the principle of electromagnetic induction. On chargeIt's the electromotive force. The generation of electromotive force requires a changing magnetic field. The changing magnetic field comes from a coil connected to the power grid. It can be seen that as long as there is a changing magnetic field, it will generate an electromotive force in the coil. Can charge your phone.
2, electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger transmission coil) will generate a magnetic field, other unenergized coil (mobile phone end of the coil) close to the magnetic field will generate current, charging for the mobile phone. The advantages of wireless charging safety: no power contact design, can avoid the danger of electric shock.
3, a changing magnetic field will produce a changing electric fieldThe changing electric field will produce a changing magnetic field, the size of which is related to their rate of change, and the rate of change of the sine function is another sine function, so the electromagnetic wave can be propagated out, and the induced voltage is related to the change of the magnetic flux, so the magnetic field inside the coil produces an induced voltage, thereby completing the charging process.
4, wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, wireless charging of mobile phones mostly uses the principle of electromagnetic induction. Electromagnetic induction wireless charging, when the power supply of the current through the coil (wireless charger of the power supply coilA magnetic field is generated, and other unenergized coils (the charged coils on the phone) near the magnetic field will generate an electric current to charge the phone.