High efficiency wireless charging system design for mobile robots

Abstract

In order to solve the problems of difficult and unintelligent charging of the mobile robot after the exhaustion of battery power, this paper applies wireless power transfer (WPT) technology to the charging of robot, and designs a wireless charging system that meets the characteristics of the robot. In this paper, the basic theory of wireless charging system is analysed. The expressions of output power and efficiency are derived, and the expressions above are input as code into MATLAB. By the MATLAB code, the effects of parameters such as coil inductance and coupling coefficient on the output power and efficiency of the system are studied, and the relevant parameters of the system are determined. Through MATLAB Simulink simulation, it is found that the voltage of the battery pack of the robot is too low and frequency split occurs. This paper proposes a frequency control strategy to deal with the frequency split phenomenon. The overall scheme of the robot wireless charging system design is given, and the design and hardware implementation of the transmitter controller, the energy coupler, and the receiver controller are given respectively. Finally, through the installation experiment, the correctness and practicability of the robot wireless charging system designed in this paper are verified.