2, Qi certification is divided into the following three wireless charging latest protocol : - Qi-BPP certification: The product supports 5W power below, the use of Qi protocol, must pass BPP certification. -Qi-epp certification: The product supports more than 5W power, the use of Qi protocol, must pass EPP certification. - Qi-PPDE Certification: Products support more than 5W power, use Samsung private protocol PPDE, must be tested by PPDE (implemented from July 1, 2019).
3, wireless charging Qi certification type can be divided into three categories: BPP certification, EPP certification and PPDE certification. 1) QI-BPP certification: The product supports less than 5W power, the use of Qi protocol, must be BPP certification. 2) Qi-EPP certification: The product supports 5WOn the power, use Qi protocol, must be EPP certification. 3) Qi-PPDE certification: The product supports more than 5W power, uses Samsung private protocol PPDE, and must be tested by PPDE (from July 1, 2019).
4, yes belongs to the three factory products, apply for Qi certification. The application process is as follows: 1) Members apply for Wireless charging latest agreement ; 2) Product registration Wireless charging latest agreement ; 3) Product provision; 4) Product compliance testing; 5) Product compatibilityTest; 6) Final product confirmation; 7) Review and issue certificates.
5, Qi certification type 1) QI-BPP certification: The product supports less than 5W power, the use of Qi protocol, must be BPP certification. 2) QI-EPP certification: The product supports more than 5W power, the use of Qi protocol, must be EPP certification. 3) Qi-PPDE certification: The product supports more than 5W power, uses Samsung private protocol PPDE, and must be tested by PPDE (from July 1, 2019).
6, Shenzhen Microtest microtest testing is mainlandA transformer, an alternating current of a certain frequency 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. The conversion efficiency is high, the cost is cheap, but the transmission distance is short, and it is easy to be affected by the placement.
Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. 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 power coil)Near this magnetic field, an electric current is generated to charge the phone.
electromagnetic induction. This is the most common way wireless chargers work, which uses the principle of electromagnetic induction to generate current through electromagnetic induction between the primary and secondary coils, so as to achieve the transfer of energy in the space. Radio waves.
Electromagnetic induction: This kind of charging system is mainly composed of the primary coil and the secondary coil two coils, through the primary coil with a certain frequency of alternating current, due to the role of electromagnetic induction, in the secondary coil will produce a certain current, visible energy is transferred from the transmission end to the receiving end. advantageIt has high energy efficiency, simple technology, short transmission distance and relatively fixed use position.
Wireless charging system mainly adopts the principle of electromagnetic induction. Wireless charger refers to the charger that does not need to be connected to the terminal device that needs to be charged without the traditional charging power cord, using the latest wireless charging technology, through the use of 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 equipment.
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 will receive the 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.
1, QC protocol working principle: the device through the USB data communication port D, D- output voltage signals to the charger, the charger built-in USB decoding chip, judge the charger needsThe voltage to be output.
2, about 5mA. After the wireless charge is connected to the QC power supply, the 9V gear of the QC0 protocol is shaken, and the standby current is about 5mA. Wireless charger is the use of electromagnetic induction principle of charging equipment, its principle and transformer similar, through the sending and receiving end of each placed a coil, the sending end of the coil under the action of power to the outside electromagnetic signal, the receiving end of the coil received electromagnetic signal and electromagnetic signal into the current, so as to achieve the purpose of wireless charging.
3, wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radioWave transmission and other methods, wireless charging of mobile phones mostly use 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.
4, in summary, public protocols such as USB PD and QC occupy the market with their wide compatibility, but the efficiency is relatively low; Proprietary protocols such as SCP offer speed advantages, but may be limited in device compatibility. In the future, with the continuous progress of technology, we look forward to moreEfficient and secure fast charging protocols, wireless fast charging will also bring new challenges and opportunities.
5, the fast charge protocol is the most common charging protocol, and many charging banks support this protocol. It allows the charging bank to provide a large amount of power to the device in a short period of time, greatly improving the charging efficiency. For example, some fast charging banks support QC0 or QC4 protocols, which are capable of providing up to 18W or more charging power, making charging very fast. The wireless charging protocol allows the power bank to charge the device wirelessly.