1, 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 chargingElectricity: When the current of the power supply passes through the coil (the power supply coil of the wireless charger), a magnetic field will be generated, and other unenergized coils (the electric coil of the mobile phone) will be near the magnetic field, and the current will be generated to charge the mobile phone.
2, the basic principle of wireless charging is to convert the current into a magnetic field, and the magnetic field is transmitted through the air and 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 windingGroup.
3, 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 current of the power supply through the coil (wireless charger's power supply coil) will generate a magnetic field, other unenergized coil (mobile phone side of the electric coil) close to the magnetic field will generate current, charging the mobile phone. As shown below.
4, the principle of wireless charging is that through near-field induction, the wireless charging device conducts the energy to the charging terminal device, and the terminal device transfers the received energyIt is converted into electricity and stored in the battery of the device. The principle of energy conduction is inductive coupling, which can ensure that there is no exposed conductive interface, which can not only save the messy transmission line between the equipment, but also be safer for electronic devices such as electric toothbrushes that are often in contact with conductive media such as liquids.
All coil winding is enamelled wire. If it's not enamelled, it shorts out. Enamelled wire generally selects the diameter of the line, which is the thickness.
Problem four: How to make mobile phone wireless charger All the coil winding is enameled wire. If it's not enamelled, it shorts out. Enamelled wire generally selects the diameter of the line, which is the thickness.
First prepare three Dongdong: one is the United States wireless coil, the other is the United States wireless charger also known as wireless energy disc, two lacquer bag money. To do a modification requires a certain amount of hands-on ability and hands-on equipment, such as: multimeter, electric soldering iron and solder.
Will paint the bagElectrical advantages Safety: no power contact design, can avoid the danger of electric shock.
Is there really a wireless power bank? In 2019, the answer is obviously yes, although there are not many wireless charging products in the real sense on the market, but the overall technology has been relatively mature. The principle of wireless charging treasure is also mainly wireless transmission, eliminating the entangling of wires.
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, increasing the coil is equal to increasing the resistance, it will make the current slow, the coil is proportionally woundToo much or too little can not, coil around less, there will be damage to the parts, resulting in parts burned spark, because do not be free to modify the wireless charging base.
Magnetic resonance charging, the principle is the same as the resonance principle of sound. Coils of the same vibration frequency arranged in a magnetic field can exchange energy with each other. If the coil is large enough, long-distance transmission is also possible, but high efficiency, miniaturization is more difficult.
In theory, wireless charging technology is safe and harmless to the human body, and the resonance principle used for wireless charging is magnetic field resonance, which is only transmitted between coils resonating at the same frequency, and other devicesIn addition, the magnetic field used by wireless charging technology is itself harmless to the human body.
The electromagnetic induction wireless charging system for electric vehicles is usually divided into two parts: power supply and power supply. Usually, a receiving coil device is installed on the chassis of the car, and another power supply coil device is installed on the ground. When the electric vehicle drives to the power supply coil device, the receiving coil can receive the current of the power supply coil, so as to charge the battery.
1, electric field coupling wireless charging, does not use the coil for electromagnetic induction, but directly through the charging base and the capacitor formed between the electrical device to be charged in the high-frequency electric field, that is, the use of the induction electric field generated by coupling two groups of asymmetric dipoles along the vertical direction to transmit power, this charging method has the advantages of low cost, low alignment requirements. But there are not many actual products.
2, no. Each wireless charging coil will have a certain amount of energy loss, increasing the number of coils will lead to a decrease in the overall charging efficiency, more coils will increase the energy loss and mutual interference, thus reducing the efficiency of wireless charging; Moreover increasingThe number of additional coils requires more coils and associated circuits to be installed in the device, which increases design complexity and cost.
3, the number of wireless charging coils is based on the number and size of the charging device to be charged. In theory, the more coils there are, the more efficiently the device can be charged, because the device can receive the charge at any location. However, if the number of coils is too large, it will increase the cost and volume, which is not practical or economical. Therefore, the appropriate number of coils should be selected according to different charging needs.