Resonance-frequency shifting method and system for wireless charging of automobiles

Abstract

The invention provides a method and system for achieving vehicle wireless charging through resonance-frequency shift. By the adoption of the method and system, wireless high-power vehicle charging with the power ranging from about 5 kW to about 150 kW is achieved, and constant-current voltage-limited charging management is completed. The system comprises a non-vehicle-end variable frequency emitting device and a power receiving device installed on an electric vehicle. According to the method and system for achieving vehicle wireless charging through resonance-frequency shift, frequency-shifted electric energy is emitted from a power emitting disk through two resonance circuits in a wireless mode, the electric energy is received by a power receiving disk, after rectification, a battery pack of the electric vehicle is charged, the requirement of the charging instruction of a battery management system BMS is met, in other words, the output power of the power emitting end and the output power of the power receiving end are controlled in a frequency shifted mode, and then constant-current voltage-limited charging is achieved. By the adoption of the mode that NFC and Bluetooth communication are combined, the electric vehicle can accurately establish the unique wireless communication channel link with a charging pile or a charger of the parking stall of the electric vehicle, the electric vehicles in a parking lot are in communication with the charging piles or the chargers in the parking lot in a one-to-one mode, link interference is avoided, and a stable negative feedback wireless control circuit is provided.

Description

technical field [0001] The invention relates to a wireless charging device for an electric vehicle, in particular to a high-power DC wireless charging cabinet and a charging pile suitable for 5kW to 150kW electric vehicle devices powered by power batteries. Background technique [0002] The development of electric vehicles will become more and more popular, and one of the factors affecting the development of electric vehicles is the convenience of charging. At present, wired charging has poor safety when it rains, the operation of wired charging personnel and the inconvenience of cables in the parking lot, etc., so the inconvenience of wired charging has also become a bottleneck for the popularization of electric vehicles. [0003] Automotive wireless charging technology is the only way for the development of electric vehicles. Wireless charging usually adopts super-audio electromagnetic induction technology, that is, the receiving power plate is installed on the vehicle, a...

AI Technical Summary

Problems solved by technology

To achieve wireless charging, it is also necessary to prevent the electric vehicle from mistakenly establishing a wireless communication link with the power transmission equipment in the adjacent parking space, but not establishing wireless communication with the power transmission equipment in the parking space, causing safety accidents

Images