The basic principle of wireless charging of electric vehicles, compared with wired charging, is mainly more than the receiving coil, simple charging interface.
Electromagnetic induction is currently a relatively mature technology, many mobile phone wireless charging, and even our common induction cooker is the use of this principle.
A certain frequency of alternating current in the primary coil generates a certain current in the secondary coil clock through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end. When used, the distance between the two devices must be very close, the power supply distance is controlled at about 0mm ~ 10cm, and the charging can only be carried out one-on-one with the alignment coil. Electromagnetic induction wireless charging has a high energy conversion rate and a large transmission power range, from a few watts to a few kilowatts. The principle of magnetic resonance is similar to acoustic resonance, as long as two media have the same resonance frequency, they can transfer energy.
The charging distance of this way is between the electromagnetic induction type and the radio wave type, and the advantage is that the transmission power is large, which can reach several kilowatts, and multiple devices can be charged at the same time, and the coil correspondence between the two devices is not required; The disadvantage is that the loss is very high, the farther the distance, the greater the transmission power, the greater the loss, the most troublesome is that the frequency band must be protected.
The main circuit is composed of input protection circuit breaker, AC smart energy meter, AC control contactor and charging interface connector. The secondary circuit is composed of control relay, emergency stop button, running status indicator, charging pile intelligent controller and human-computer interaction device (display, input and swipe card).
The main circuit input circuit breaker has overload, short circuit and leakage protection functions; Ac contactor control power supply on and off;