No abstract

During wireless charging, the change of battery resistance will cause the fluctuation of output power, which will shorten the battery life and affect the charging safety. According to the theoretical analysis of WPT, when the load resistance changes, the output power can be stabilized by adjusting the input voltage of the system. Aiming at the variable load MCRWPT system, that is, only the load resistance changes under the resonant state, this paper designs the MCRWPT constant power control system by using the principle of reflective impedance and using the phase-shifting control voltage regulation and builds a simulation model through Matlab/Simulink platform to verify that the output power is kept in a certain range, without additional communication loops, which reduces the volume of electrical equipment and saves costs.

In the process of power transmission, changes in system parameters, such as inductance, capacitance and system operating frequency, will cause system detuning and reduce transmission performance. In this paper, a combined control system with frequency tracking is designed for the detuning of MCRWPT system caused by the parameter changes in the non overcoupling region. Only the phase controlled capacitor is added at the transmitter to tune, and at the same time, the phase-locked loop is used to track the frequency, so that the system can quickly recover the resonant state after detuning. This method does not need to add a circuit at the receiving end, which ensures that the system can obtain the best transmission characteristics while reducing the volume of electrical equipment.