1, simply put, the current is concentrated in the skin part of the conductor, so it is called the skin effect. The main reason for this effect is that the changing electromagnetic field creates a vortex electric field inside the conductor, which cancels out the original current. Obviously, in high-frequency applications, if only one wire is used because of its relatively small surface area, the current utilization rate will be greatly reduced, so that the wire heating is serious or the signal attenuation is increased, which is obviously what we do not want.
2, the same size. The same size and tryClose. Otherwise, it won't work. It's inefficient.
3, there is an electromagnetic signal sent in the sending single coil, and the receiving single coil can receive the electromagnetic signal sent, and then the electromagnetic signal is converted into current, and the current enters the mobile phone, so as to achieve the effect of wireless charging. In simple terms, the wireless charger is actually a charging mode that relies on the energy of electromagnetic waves to convert electromagnetic waves into electricity.
4, wireless charging of the transmitting and receiving coil distance of about 8mm. The QI standard is not just the distance between the two, but the frequency and communication protocol of the two wireless charging standards. This distanceIs a maximum distance, beyond which the efficiency of wireless reception is very low. So it doesn't have to be 8mm.
Press the positive and negative terminals. How the wireless charging coil is wound, placed and how to control the charging power, the use of electromagnetic mutual induction phenomenon, through the magnetic field coupling of the two coils can complete the transmission of electric energy. Below, we discuss how to efficiently complete the transmission of electricity. This involves how the coil is wound, placed and how to control the charging power. Wireless chargingThe device is a device that uses the electromagnetic wave induction principle to charge, and the principle is similar to that of a transformer.
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.
It is best not to change that, because you these two are output terminals, afraid of problems, you will buy a set of USB male and female connection head, put your original wireless charger onWhat harm or change will the wireless charging base increase the coil? '> Please ask the gods, what harm or change will the wireless charging base increase coil? 1, 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, 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.
2, wireless charging noIt will accelerate the aging of the battery and will not have radiation to the body. The principle of wireless charging is electromagnetic induction. The charging dock is like an iron core with some primary coils wrapped around it. Cell phones have secondary coils built into them. The primary coil is energized to generate electromagnetic induction, so that the secondary coil generates induction voltage, and generates induction current to charge the mobile phone after loading. So don't worry.
3, can not, excessive increase in voltage or increase the number of turns will burn the battery, because the more you turn the higher the voltage, I do not know whether your self-made charger is Qi program, if it is Qi, it is not possible, this must be closeContact? You need to switch to radio, anything within five meters.
4, 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.
5, the harm is relatively small can be ignored, wireless charging technology has appeared in the 19th century, but the popularity of mobile phone applications is not high. It uses the principle of "magnetic resonance" to allow the wireless charger to transmit an electric charge through the air to the phone's battery. Many wireless chargers on the market do not indicate radiation levels,Electromagnetic radiation standards for wireless chargers have not yet been introduced.
6, the changing magnetic field will produce a changing electric field, the changing electric field will produce a changing magnetic field, its size 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 transmitted out, and the induction voltage is related to the change of magnetic flux, so the magnetic field inside the coil will produce induction voltage, This completes the charging process.
Wireless charging coil test wellThe bad method is as follows: test the resistance value of the coil, and the resistance value is a good product within a certain range. 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.
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 wireless charging coilsPrecise evaluation.
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.
Wireless charging coil test coil capacitance to the ground because the capacitor is the electric field energy and magnetic field energy conversion material, 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.
Indicator. A chip location is reserved. The wireless charging coil is thermally sensitiveResistor, detects the temperature while charging. Type-C seat with steel plate inside, durable. Disassemble the family photo. Zte wireless charger products work neatly and look very comfortable. The input has electrostatic protection to avoid damage and reasonable design. Using well-known manufacturers in the industry components, IDT solution with diodes mos tube, the material is the mainstream level.
AP45851 compatible with high power output, chip compatible with Qi fast charge protocol (5/9/12V application), in line with the latest Wireless Charging Alliance (WPC) Qi version specifications. The AP45851 uses the unique CNS-chip as System technology to fully integrate a variety of high-performance mixed-signal functions, such as low-power device detection during standby and foreign object detection (FOD) for secure wireless charging.
Wireless charger refers to the use of electromagnetic wave induction principle for charging equipment, the principle is similar to variable voltageA surname 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.
Play the role of metal isolation, prevent energy waste, improve charging efficiency.
You have normal no-load voltage and low on-load voltage. The no-load voltage is normal, indicating that your wireless charging transceiver circuit is normal, but the voltage is pulled down after the load, the most likely is that your coil matching is not good, resulting in insufficient power received by the output end, so the charging voltage will be pulled down.
ThisThe principle is very similar to that of a real radio. That is, the sending end sends a high-frequency alternating magnetic field, and the receiving end changes the energy through LC resonance. Here's a picture for you. In the second half of this year, there is also a period of homemade wireless charging equipment, but the information is placed in the unit. I can't upload it.
No. The wireless charging coil is directly connected to the positive and negative terminals. The wireless device cannot recognize the charging device, so it cannot be charged. Wireless charging receiving cableThe coil is to accept the current emitted by the wireless charging transmitting coil. When the transmitting coil emits the current, the receiving coil receives the emitted current to the current storage end.
It is best not to change that, because you are both output terminals, afraid of problems, you will buy a set of USB male and female connector, the original wireless charger on your mobile phone charging line is broken into two connected to your male and female connector it is not good for two.
The principle is very simple, stick the charging coil inside the mobile phone battery cover, paste the screen wallpaper, and then connect the positive and negative electrodes to the mobile phone usb power supply. I can put my phone on the spotWireless charging on the Touchstone transmitter.
In summary, the modification did not actually make any circuit changes to the host, but added an outlet cable, and did not change the volume shape, you can continue to install a thin battery and other back cover, you can also install a wireless charging component for the thin battery cover. In order to make the modified phone have more charging compatibility, the MINI USB port is empty, even if you do not bring a charger, you can normally use other.
First, follow the matching of positive and negative poles and colors. Second, from left to right, there are English letters V, D-, D, G, apple 5 numberAccording to the line color is red, black, green, white, V is connected to the positive terminal (red line), G is connected to the negative terminal (black line), D- is connected to the white line, D is connected to the green line.