1, there are 6 commonly used book binding methods: (1) horse binding. The pages only rely on two wire nails to connect, because the wire is easy to rust, so the fastness is poor. Suitable for ordering books with less than 6 print sheets. (2) Flat booking. The pages are loose because the wire rusts easilyAn electric field is generated, and a changing electric field can produce a magnetic field. In high school textbooks, Faraday has long taught us the truth of "electromagnetic mutuality". The charging seat and the mobile phone each have a coil, the charging seat is called the main coil, and the mobile phone is called the secondary coil.
Wireless charging is what is going on, as the name suggests is charging do not plug the cable. Similar to WiFi, it is very convenient. In theory, mobile phones and other electronic devices can be powered anytime, anywhere. However, wireless charging can not be transmitted as far as WiFi for the time being, and now mature solutions can only achieve wireless charging within a distance of 10mm, generallyThe distance of about 3~5mm is better, and this kind of wireless charging technology uses magnetic induction wireless charging technology.
The basic principle of wireless charging: 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.
The principle of electric field coupled wireless charging is to transmit electrical energy through the induced electric field generated by the coupling of two sets of asymmetric dipoles in the vertical direction. Suitable for short distance charging, high conversion efficiency, the position can not be fixed; However, the disadvantage is that the equipment is large and the power is small. Therefore,At present, among the four wireless charging methods, electromagnetic induction wireless charging scheme is the most mature and most widely used in business.
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.
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, and uses the latest wireless charging technology by using the line