Views: 1 Author: Site Editor Publish Time: 2022-12-29 Origin: Site
More than 100 smartphones from today's top phone Manufacturers will support Qi, the mainstream .wireless charging standard. Wireless charging stations are in cars, restaurants, hotels, airports, corporate offices, and automobiles.
If you want to use the wireless charging feature, a glass back panel beats a metal back panel. No need to replace housings, Cases, and adapters: You already have the best charging system and don't need them anymore.
Inside a typical charging pad, There are coils with a diameter of about one and a half inches, wound 10 to 20 turns. The back of the phone has a similar coil - its companion if you will. The coil of the strike pad is driven by about 1 amp of AC at a frequency of about 200 kHz. As shown in the diagram, this current creates a magnetic field, which induces a current in the phone's coil. (For tech-savvy: Yes, just like in a transformer. It's a transformer.) The phone coil will be connected to the rectifier, which converts AC power into DC power to charge the battery.
But why exactly does the material on the back of the case matter when you're charging your phone?
The answer is simple: metal can hijack charging power.
On the back side of the Glass, the magnetic field transfers power from the charging pad coil to the smartphone's coil, where the energy loss is negligible.
But power loss occurs on the metal back. The metal consumes some of the charging pad's energy and converts it into heat. Therefore there will be a transmission energy loss, leading to an increase in charging time. In addition, there is a real risk that the heat may raise the phone's internal temperature, which is not a good thing, as electronics like to run at low temperatures.
Zooming into more detail, this is what happens to the metal backplate. The circulating current will consume part of the alternating magnetic field, later called "eddy current." These eddy currents heat the back the same way that current heats the components in an electric heater. The amount of heat generated in a cell phone depends on the metal used to make the phone. The "conductivity" of a metal is a physical property that describes the tendency of the metal to convert the current flowing through it into heat. Aluminum typically has a conductivity 25 times higher than stainless steel. The conductivity of Glass is almost zero.
Glass: Positive Acceptance
Glass is the best material for wireless charging for now and for the foreseeable future. It will also play a key role in 5G wireless reception. While metal backplanes can accommodate wireless signals, 5G will involve more channels and frequencies, requiring higher antenna performance. Metal, which tends to hijack signals, won't help. Glass will be better suited for smartphones.