Research on robot wireless charging system based on constant-voltage and constant-current mode switching

Abstract

The traditional wired charging of robot has the disadvantages of inconvenient charging and manual operation for electrical connection. With the continuous development of radio power transmission, the disadvantages of wired charging are overcome, and the charging process does not need manual intervention. At present, a single compensation network is often used to charge the robot wirelessly, but the single compensation network only has constant current or constant voltage output capability. When the constant voltage or constant current mode is switched in the charging process, additional DC–DC​ circuit is needed for control, which increases the difficulty of system design and system volume, and the control is also more complex. In this paper, based on the robot wireless charging system, a coupling mechanism which can switch topology is designed. The LCC-S/ LCC compensation network is used. In the charging process, the constant current and constant voltage charging mode is switched by switching the compensation network at the receiving end, which simplifies the design difficulty, volume and control method of the system. Finally, an experimental platform is built, and the experimental results verify the feasibility of the proposed topology and control method.

Keywords

• Wireless power transfer
• Constant current constant voltage two stage charging
• LCC-S/LCC
• Topology switching