Abstract
At present, wireless power supply technology has gradually attracted people’s attention due to its safety, convenience, and portability. It has become one of the development trends of power supply for future technologies such as electric vehicles. In many engineering applications, inductive wireless power supply systems need to supply power to multiple loads at the same time. Therefore, it is necessary to analyze the dynamic process of the multiload system. This paper first selects the optimal compensation network according to the stable operating conditions of the multiload system. Secondly, in order to classify and describe the movement state of the load in the dynamic process, the simulation model is established on the MATLAB/SIMULINK platform to analyze the influence of the mutual inductance or resistance of any load on the output characteristics of the primary system and other loads. Then, in order to solve the problem of unstable output voltage used by multiple loads entering the same track at the same time or load resistance changes, this paper adopts a secondary side control strategy. The duty cycle of the Buck circuit is adjusted by the fixed frequency PWM sliding mode controller (PWMSMC), so as to realize the independent control of each load. Finally, an experimental platform was established to verify the correctness of the theoretical analysis.
Highlights
Wireless power transfer (WPT) has become a major technology in modern automation applications because it provides less installation workload, greater flexibility and mobility, and at the same time eliminates the wear and tear of power supply cables [1]
The results show that, in a single-load system, by controlling the change of Buck duty cycle by PWM sliding mode controller (PWMSMC), a fast dynamic response and stable output voltage waveform can be obtained
This paper analyzes the dynamic process of multiload induction wireless power supply system and its control strategy for stable output
Summary
Wireless power transfer (WPT) has become a major technology in modern automation applications because it provides less installation workload, greater flexibility and mobility, and at the same time eliminates the wear and tear of power supply cables [1]. Static wireless charging and wired charging have problems such as frequent charging, short cruising range, large battery consumption and high cost [2,3]. In this context, dynamic wireless power supply technology emerged. The inductive wireless power supply technology uses the principle of electromagnetic induction to transmit the electric energy in the track to the receiving coil, charge the battery or directly power the motor. The electrical equipment can be equipped with a small number of battery packs, and the power supply becomes safer and more convenient.
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