Positioning system for wireless charging of electric vehicle

Abstract

The invention discloses a positioning system for wireless charging of an electric vehicle. The system comprises a primary side unit and a secondary side unit; the primary side unit comprises a primaryside power coil, auxiliary coils and a communication signal transmitting module, and the secondary side unit comprises a secondary side power coil, a communication signal receiving module and a secondary side control module; the communication signal transmitting module connected to the auxiliary coils generates communication signals including ID information of the auxiliary coils and applies thecommunication signals on the auxiliary coils, the communication signals are transmitted to the secondary side power coil through coupling between the auxiliary coils and the secondary side power coil,the amplitudes and IDs of the communication signals are obtained through the communication signal receiving module and the secondary side control module, by calculating the amplitude values of the communication signals of all the auxiliary coils, the position, relative to the primary side power coil, of the secondary side power coil can be obtained, and therefore the secondary side power coil ispositioned. According to the positioning system, just by additionally arranging a small amount of additional hardware, the position of the secondary side power coil in a wireless charging system of the electric vehicle can be quickly and accurately measured.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle wireless charging, and in particular relates to a positioning system for electric vehicle wireless charging. Background technique [0002] As the energy crisis and environmental pollution continue to intensify, the trend of electric vehicles gradually replacing traditional energy vehicles is becoming more and more obvious. However, many factors limit the application of electric vehicles, such as: large battery size, high price, and short battery life. Moreover, the wire plug-in charging method commonly used by electric vehicles at present also has the aging of the contact port and is prone to electric sparks; the length of the transmission cable and dragging obstacles limit the flexibility of the mobile device; the transmission equipment has poor tolerance in harsh environments such as high temperature and high pressure. High maintenance costs and other issues; electric vehicles need to a...

AI Technical Summary

Problems solved by technology

Generally, the primary power coil is installed on the ground to transmit power, and the secondary power coil is installed at the bottom of the electric vehicle to receive power; the horizontal offset between the primary and secondary coils will lead to a decrease in the efficiency of the wireless energy transmission system and the power electronics in the system. Increased device voltage and current stress

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