发布时间：2023-06-09
Wireless charging technology is divided into static wireless charging (electromagnetic radiation type, electrostatic coupling type, magnetic field coupling type) and dynamic wireless charging.
Concept and Principle of Static Wireless Charging Technology for Vehicles
Static wireless charging technology charges electric vehicles when they are stationary, commonly used in shopping malls, parking lots, or parking spaces with self-installed charging stations.
Static wireless charging can be classified according to the transmission mechanism: electromagnetic radiation type, electrostatic coupling type, and magnetic field coupling type:
Electromagnetic radiation static wireless charging technology: Its transmission technology transfers energy through far-field methods, mainly including radio wave and laser methods, suitable for long-distance wireless power transfer.
Electrostatic coupling static wireless charging technology: Its transmission technology transfers electrical energy through the near field, using alternating electric fields to transmit energy.
Magnetic field coupling static wireless charging technology: Its transmission technology transfers electrical energy through the near field, using alternating magnetic fields for energy transfer. Magnetic field coupling technology has gained popularity and is widely used in static wireless charging for electric vehicles.
Among them, magnetic field coupling static wireless charging technology is a relatively well-discussed mode.
The commonly used magnetic field coupling wireless power transmission technologies are inductive and resonant types.
Inductive type: An alternating current at a certain frequency is applied to the primary coil, generating a certain current in the secondary coil through electromagnetic induction, transferring energy from the transmitting end to the receiving end. The devices need to be very close during use, with the power transmission distance controlled at about 0–10 cm, and charging must align the coils 1V1. Inductive wireless charging has a high energy conversion rate and a wide range of transmission power, from several watts to several kilowatts. It offers high power and high efficiency at close range, but is sensitive to the coupling coefficient, making it generally suitable for short-distance transmission.