The principle of wireless charging in the car is learned by everyone in middle school, that is, Ampere's law and Faraday's law. Ampere's law means that an oscillating electric field produces an oscillating magnetic field, Faraday's law means that an oscillating magnetic field produces an oscillating electric field, and wireless charging, that is, the time-varying magnetic field generated by the power transmitter, produces an electromotive force in a properly positioned power receiver.
When charging with an on-board wireless charger, the power transmitter generates an alternating current through its coil, which, according to Faraday's law, generates an alternating magnetic field, which is in turn picked up by the coil in the power receiver and converted by the power converter back into a DC current that can be used to charge the battery. The magnetic field has a feature, that is, it can pass through plastic, glass, water, air and other non-metallic non-iron materials, so there is no need for wires and connectors between the power transmitter and the power receiver to achieve charging function, which is the principle of wireless car charging.
A: The principle of on-board wireless charging uses electromagnetic induction that can provide power between the supply coil and the receiving coil.
1. Electric energy is transmitted by non-contact means such as electromagnetic response, electromagnetic resonance, frequency emission, etc. 2. In this case, charging is carried out without leakage of the connector. 3. Avoid safety hazards such as leakage and running during charging. It is very convenient to use and can also avoid circuit clutter.
The principle of on-board wireless charging is the electromagnetic induction method that can provide power between the supply coil and the receiving coil.
A receiving coil device is installed on the chassis of the car, and another power supply coil device is installed on the ground. When the electric vehicle drives to the power supply coil device, the receiving coil can receive the current of the power supply coil, so as to charge the battery.
The principle of automobile wireless charging is electromagnetic induction, electromagnetic induction wireless charging is the most used wireless charging solution, high school physics textbooks have mentioned through the primary coil of a certain frequency of alternating current, using electromagnetic induction in the secondary coil to produce a certain current, thereby transferring energy from the transmission end to the receiving end.
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At present, the most common charging pad solution uses electromagnetic induction, in fact, electromagnetic induction solutions in the technical realization is not too mysterious, China's local BYD company, as early as December 2005 to apply for a non-contact induction charger patent, the use of electromagnetic induction technology.