Wireless charging device and protection circuit thereof

Abstract

The invention relates to the technical field of electronics and provides a wireless charging device and a protection circuit thereof. The wireless charging device comprises a wireless power transmitting module and a wireless power receiving module; the wireless power transmitting module comprises a first control module and a power supply module; the power receiving module comprises a second control module and a receiving module; the protection circuit comprises a voltage comparison module, a switch module and a silicon controlled follow current module; when an overvoltage anomaly exists, the voltage comparison module is used for outputting a conduction signal to the switch module, the switch module is conducted, so that the silicon controlled follow current module is conducted; when the silicon controlled follow current module is conducted, the voltage of the voltage output end of the receiving module is reduced, and the second control module is powered off and stops working so as to enable the communication between the second control module and the first control module to be interrupted; when the first control module detects communication interruption of the first control module and the second control module, a power supply stop instruction is output to the power supply module, so that the power supply module stops working, and the circuit is safe, reliable and easy to realize.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a wireless charging device and a protection circuit thereof. Background technique [0002] An electric vehicle refers to a road vehicle that relies entirely or partially on electricity as a driving energy, including electric vehicles and electric bicycles. Electric vehicles need to charge the battery pack to supplement electric energy. Usually, the battery is charged through the charging and changing cabinet Charge. At present, most electric bicycle battery charging and changing cabinets use wired charging. The wired charging method requires frequent plugging and unplugging of the charging cable, and the life of the connector between the charging and changing cabinet and the battery pack is generally about 500`2000 times. Frequent plugging and high current charging will cause poor contact of the connector and increase the contact resistance. If the contact part ...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a wireless charging device and its protection circuit, which aims to solve the problem that the current wireless charging method will cause the voltage of the rear stage to rise and damage the battery pack and charging device when the load is open.

Images