Q1: What are the ways of wireless charging? What is the principle?
A: There are several types of wireless charging, such as induction, resonance, microwave transmission, etc. But in general, their basic principle is the same, which is to use the electromagnetic induction of alternating electromagnetic fields to achieve wireless energy transmission.
The induction type of wireless energy transmission is currently a relatively mature technology, many cell phones wireless charging, and even our common induction cooker is the use of this principle. Because the digital device space is small, the receiving coil is also small, coupled with the charging device power is small, so the charging distance is usually close (even need to contact with the charging base), but the relative electromagnetic radiation is also small.
Resonant is a type of charging technology currently being developed by MIT, and to put it mildly, they use the phenomenon of electromagnetic induction, coupled with the principle of resonance, to enhance the efficiency of wireless charging. Resonance transmission distance than the ordinary induction type some farther, and MIT is currently in the miniaturization of the research - for the car length of several meters of electric vehicles, this aspect of the technology pressure is not too big.
Microwave transmission type previously appeared more in science fiction movies or novels, in fact, it is also a good way of wireless power transmission, but by the transmission power and other aspects of the limitations, not large-scale practical. The biggest advantage of microwave transmission is that the transmission distance is long, and can even achieve energy transmission between spacecraft and the ground, but also can achieve directional transmission (transmitting antenna has directional), the future prospects are worth looking forward to.
Q2: What are the benefits of wireless charging?
A: The first benefit of wireless charging is that it does not require a wire, so you don't have to look around for a charging wire and bother. The second is that the standard of wireless charging in terms of hardware is more easily unified.
Q3: What are the problems to be solved?
A: First, the transmission efficiency is a problem faced by all wireless charging, for electric vehicles such as charging power more "electrical appliances" is even more so - electrical energy is first converted into radio waves, and then converted from radio waves into electrical energy, both conversions will lose a lot of energy.
Second, electromagnetic compatibility is also one of the technical bottlenecks that need to be solved for wireless charging. Electromagnetic waves are easy to produce leakage, when the high-powered vehicle wireless charging equipment operation, will also have an impact on the surrounding biological and electronic equipment, and can even endanger human health. The use of closed automatic intelligent garage installation of wireless charging equipment is a better way to solve the electromagnetic compatibility, but the cost is also really not expensive.
Third, electrical standards and other aspects.
