1, this is not allowed, wireless charging Qi certification compliance test and compatibility test will detect whether the EPP coil (protocol) project; Even if compliance tests can be passed after software tweaks, compatibility does not pass.
2, single coil: A11, A11a, MP-A2; 2) Multi-coil: A28 A28, MP-A13. Single-coil multi-coil Qi certification can be divided into the following three categories according to the product: 1) chargingElectrical products; 2) Mobile power supply products; 3) Embedded device (product contains TX transmission function).
3, QI-BPP certification: The product supports 5W power, the use of Qi protocol, must be BPP certification. Qi-epp certification: The product supports more than 5W power, the use of Qi protocol, must be EPP certification. Qi-PPDE certification: Products support more than 5W power, use Samsung private protocol PPDE, must be tested by PPDE (starting from July 1, 2019).
4, wireless charging Qi certification test content includesCompliance test and Interoperability Test. The compliance Test was conducted by the Authorized Test Lab (ATL) with 5 samples.
The transmitting end is often multiple strands of silk-covered wire, multiple strands of thinner enameled wire or gauze wrapped wire wound inductors are used in relatively high frequency circuits, such as the magnetic antenna rod coil of the radio, the shortwave radio coil, the high frequency transformer coil of the liquid crystal display lighting circuit, etc., often use multiple strands of wire and wound.
◆ Enameled wire is an insulated wire coated with paint, so it can be wound into a variety of shapes of coils used in a variety of electronic devices, without producing the phenomenon of short circuit between wires. ● If it is not enameled wire, but a wire wrapped with other insulating substances, such as gauze wire, silk wire, insulating sleeve pipeline, etc., can also be used as a coil.
Silk-covered wire: a copper wire is wrapped with glass fiber wire as an insulating sheath. Enamelled wire: a copper wire is attached to a chemical insulating material as an insulating skin. The breakdown voltage of silk-covered wire is only a few hundred volts, the breakdown voltage of enameled wire is several thousand volts, if the insulation is no problem, I think it is possible to exchange.
The materials usually used for winding transformers are enameled wire, sandbag wire, silk-covered wire, and the most commonly used enameled wire. The requirement for a wire is conductivityCan be good, insulating paint layer has enough heat resistance, and must have a certain corrosion resistance. As we use this Novo electrical equipment, the win-win transformer, all use high-strength polyester enamelled wire.
3, 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 then converted into a current to be transmitted to the intelligent terminal. When the system works, the input end converts the AC mains into DC through the full bridge rectifier circuitElectricity, or use 24V direct current terminal to directly supply power 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.
4, the principle of wireless charging technology is "magnetic electricity", simply put, through the charging device and the mobile phone device installed on the two "magnetic equipment" mutual induction and formation of current. At present, products supporting wireless charging have appeared in mobile phones, electric vehicles, smart furniture and other fields. Among them, in the mobile phone industry, the "Qi standard" is the most common, and Qi is often used in the packaging of many mobile phones and wireless chargersSign for annotation.
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, silicon steel sheet or permalloy is usually selected as the core material.
Wireless chargingAfter the 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.
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 wound, too much or too little can not, coil wound less,There will be damaged parts, resulting in burned parts causing sparks, because some do not freely modify the wireless charging base.
Therefore, I personally think that rich or choose imported cells. (2) The thickness is less than 18mm or see a variety of strange shaped mobile power supply, which is used in polymer, are lithium ion polymers, mainly lithium cobalt, lithium phosphate, and lithium manganese acid, etc., lithium cobalt acid cell is the best, this cell can be made into any shape.
From the theory, wireless charging technology is safe and harmless to the human body, and the resonance principle used by wireless charging is magnetic field resonance, only at the same frequencyRate resonance is transmitted between coils, and other devices cannot accept the band, in addition, the magnetic field used by wireless charging technology is itself harmless to the human body.
Hello, about whether magnets will be used in the wireless charger. First of all, you must understand the principle of wireless charging, that is, electromagnetic induction, through the magnetic flux between the two coils is constantly changing, to transfer energy, and electromagnetic induction in order to make the coil magnet more concentrated, usually the core of these materials with large permeability to reduce energy loss, therefore, wireless charger inside do not need to use magnets.
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 sets of asymmetric dipoles along the vertical direction to transmit power, this charging method has the advantages of low cost and low alignment requirements. But there are not many actual products.
2, the transmitting end is often made of multiple strands of silk-covered wire, multiple strands of thinner enamelled wire or gauze covered wireInductor coils are used in relatively high frequency circuits, such as the magnetic antenna rod coil of the radio, the short-wave radio coil, the high-frequency transformer coil of the liquid crystal display lighting circuit, etc., often use multiple strands of wire and wound.
3, at the sending end and the receiving end, the wireless charger has a coil. There is an electromagnetic signal sent out in the sending single coil, and the receiving single coil can receive the electromagnetic signal sent out, 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 short, the wireless charger is actually a charge that relies on the energy of electromagnetic waves to convert electromagnetic waves into electrical energyMode.
4, 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. Electromagnetic induction: A certain frequency of alternating current in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end.
5, hello, about whether magnets will be used in the wireless charger. First of all, you must understand its wireless charging principle, that is, electromagnetic induction, throughThe magnetic flux between the two coils is constantly changing to transfer energy, and electromagnetic induction in order to make the coil magnet more concentrated, usually the core of these materials with large permeability to reduce energy loss, therefore, the wireless charger does not need to use magnets. 6, wireless charger From the theory, wireless charging technology is safe and harmless to the human body, the resonance principle of wireless charging is magnetic resonance, only in the same frequency resonance between the coil transmission, and other devices can not accept the band, in addition, the magnetic field used by wireless charging technology itself is harmless to the human body.