Protection device and protection method for vehicle-mounted terminal equipment of electric vehicle wireless charging system

Abstract

The invention discloses a protection device and a protection method for vehicle-mounted terminal equipment of an electric vehicle wireless charging system, and belongs to the technical field of electric vehicle wireless charging and charging safety. The protection device comprises a controllable rectification circuit, a protection control circuit and the like. The controllable rectification circuit adopts a full-bridge rectification circuit and comprises four power switch tubes. The protection control circuit judges whether a battery load is suddenly cut off from the wireless charging system or not according to the detected voltage and current values and then controls the gate-level signals of the power switch tubes, and when the conduction angles of the gate-level signals are zero, the effect of isolating a filter capacitor from the wireless charging system can be achieved. The protection method disclosed by the invention has the characteristic of quickness, and can timely perform protection when a load shedding condition occurs, so that the safety of the vehicle-mounted terminal equipment is ensured. The protection method provided by the invention is relatively low in investmentcost, relatively high in reliability and very high in practicability.

Description

technical field [0001] The invention discloses a vehicle-mounted device protection method of an electric vehicle wireless charging system, and belongs to the technical field of electric vehicle wireless charging and charging safety. Background technique [0002] With the rapid development of electric vehicles, the wireless charging technology of electric vehicles has been applied. When an abnormality occurs in the charging process, the BMS may forcibly control the battery to cut off the wireless charging system. When the system is connected, the filter capacitor will be continuously charged, and after a long time, the filter capacitor will exceed the safety limit, resulting in serious consequences such as fire and explosion. How to ensure the safety of wireless charging for electric vehicles has become a hot topic of research by experts and scholars at home and abroad. At present, the protection method of the vehicle terminal of the wireless charging system is generally to ...

AI Technical Summary

Problems solved by technology

At present, the protection method of the vehicle terminal of the wireless charging system is generally to send a command to turn off the power supply from the vehicle terminal to the ground terminal. This method requires response time and cannot fully guarantee the safety of the vehicle terminal equipment.

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