Wireless charging system and wireless charging method based on primary side controllable capacitance compensation

Abstract

The invention provides a wireless charging system and a wireless charging method based on primary side controllable capacitance compensation. The system comprises a transmitting end circuit and a receiving end circuit. The two ends of the primary side controllable capacitance compensation circuit of the transmitting end circuit are connected in parallel with two switch assemblies which are connected in series. In the initial charging stage, all switch assemblies of the primary side controllable capacitance compensation circuit are disconnected, and constant-current charging is carried out on a battery load; and when the amplitude of the primary side current reaches a current threshold value corresponding to the condition that the total equivalent load of the system is located at the optimal matched resistance of the system, the capacitance value of the primary side series compensation circuit is changed by controlling the conduction of a switch assembly of the primary side controllable capacitance compensation circuit, and constant-voltage charging is carried out on the battery load. According to the wireless charging system based on primary side controllable capacitance compensation, the working frequency is fixed, the frequency bifurcation phenomenon does not occur, and the wireless charging system is stable and reliable.

Description

technical field [0001] The present invention relates to the technical field of wireless power transmission, and more particularly, to a wireless charging system and a wireless charging method based on primary side controllable capacitance compensation. Background technique [0002] Inductive wireless power transmission technology is more and more popular in research because of its advantages of safety, stability, flexibility and convenience, electrical and mechanical isolation. It can work in harsh environments such as underwater and mines, and is also widely used in wireless power supply and battery charging, such as electric vehicles, underwater exploration, underground mines, aerospace, implantable medicine, LED lighting, mobile phones Wireless charging of batteries, wireless charging of electric vehicles, etc. These technologies all rely on the charging of the battery, and the charging process of the battery mainly goes through two stages of constant current charging an...

AI Technical Summary

Problems solved by technology

[0004] In the first method, adding a DC-DC converter and corresponding control will increase power loss and cost, which is not conducive to simplifying the design; in the second method, a variety of topological structures are used to achieve constant current output and constant voltage output, so that the entire The system is complex and redundant, and the corresponding scope of application will also be limited; the third method needs to achieve constant current output and constant voltage output under the corresponding compensation network by changing the switching frequency. The design process is very difficult and increases the cost of the system. and complexity

Images