Wide impedance range, to meet 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; 0 in ravgIn the range of.08~ 0.4m, the output power decreases first and then increases and then decreases with the increase of the number 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. Standard coil technologies (such as wire winding coils and PCB coils) generally specify quality factor values.
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.
The basic principle of wireless charging is to convert the current into a magnetic field, which is transmitted through the air and then converted into a current to be transmitted to the intelligent terminal. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to supply power to the system directly. 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.
Wireless charging system mainly adopts the principle of electromagnetic induction. Wireless charger means no useThe traditional charging power line is connected to the charger on the terminal device that needs to be charged, using the latest wireless charging technology, by using the magnetic field generated between the coils, the magic transmission of electrical energy, inductive coupling technology will become a bridge connecting the charging base station and the device.
Generally seen wireless charging, the use of the "current magnetic effect" and "electromagnetic induction" principle. In 1819, Danish scientist Elster observed that if there is an electric current on a wire, a magnetic field will be generated around it, which can deflect the north finger. Later generations further discovered that the magnetic field generated by encircling the wire into a ring, or even wound into a coilWill be stronger, more concentrated, this is called the "current magnetic effect."
No strong radiation, no effect on the human body! The main principle is: the way of wireless charging is electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. Most of the wireless charging of mobile phones uses the principle of electromagnetic induction.
Select high power high frequency triode, such as TV tube. If the power is not large, you can choose the medium power tube, the field effect tube.
RunThe electromagnetic coil used in the field of wireless charging is also related to the improvement of the wireless charging efficiency of the entire system, but the coil itself has power loss. Wireless charging coils need to be arranged on both the transmitter and the receiver, and low loss coils can greatly improve the efficiency of wireless charging. Other green wireless charging boards use fast charging coils, with a conversion efficiency of 76%, which is in line with the Qi wireless charging standard of iPhone 8 and iPhone X, and can be well adapted.
Soldering iron, copper wire, resistor, transistor, capacitor. That will do. So wireless charging is simple. But I suggest you don't do it yourself.It's all special materials. If you do it for fun, just make an oscillating circuit.
The so-called "plus transistor" refers to signal amplification, if you want to increase the voltage of the power supply, "plus transistor" is not possible, to use a voltage doubling circuit, DC voltage doubling is more troublesome, I give you a DC double voltage circuit. Theoretically, the output voltage of 24V is actually less than 24V because of the voltage drop of the diode and the transistor, which I have done, more than 20 V. The value of the component doesn't have to be too accurate, just close.
Definitely not. The current and power of the 9018 are too lowHuawei launches multi-device smart wireless charging pad with built-in 13 coils that can simultaneously charge three devices At the Huawei P50 conference on July 29, Huawei launched a multi-device smart wireless charging board with 13 built-in wireless charging coils to support simultaneous charging of multiple devices, with a maximum wireless charging power of 15W X3, providing users with integrated wireless charging solutions such as mobile phones, headphones, smart watches, etc., without alignment, and can be easily charged at any location. Recently, more information about this charger was revealed, the price is 799 yuan, and the sale time is September.
Huawei's new work revealed: Beyond Apple's smart charging board, only 799 yuan starting at Huawei's July new product launch conference, although Huawei P50 series and MatePad Pro 16 and other products stole the show, but a mysterious new product was not ignored. This product is Huawei multi-device intelligent wireless charging board, it has been officially listed, the price is only 799 yuan.
Whether it is Huawei, Xiaomi or Apple mobile phones, this charging board can be compatible, helping users reduce their dependence on mobile phones and improve the convenience of scientific and technological life. Overall, this 3-in-1 wireless charging pad with a sense of technology is worth pushingAdd utility and beauty to your desktop.Huawei Super Fast charge wireless charger (MAX 27W) : Align the coil center of the earphone case (the lower part of the earphone is near the back position of the LED light, not the geometric center) with the center of the wireless charger coil, and the indicator light is charged.
How to operate: You need to buy a wireless charging board, connect the wireless charging board to the power supply, and then put the phone in the central position of the wireless charging board to charge, if you can not charge, you can adjust the placement. Phone use tips: p30pro uses a full screen design, support a variety of operationsOpen the system Settings page of the phone, click Intelligent assistance - system navigation, and then choose your favorite operation mode.
Other brands such as vivo, OPPO, etc., their high-end models are also gradually introducing wireless charging function. Advantages of wireless charging Wireless charging technology brings great convenience to mobile phone users. Using wireless charging, users do not need to carry a lot of cables, just place the phone on the charging pad, can achieve charging. In addition, wireless charging technology also has the characteristics of high charging efficiency, which can save time for users.