The large weight of the unmanned aerial vehicle (UAV) could cause a decrease in endurance mileage, while poor anti-offset performance could extend charging time and may even damage onboard equipment. To address the above issues in constant voltage/current (CV/CC) capacitive power transfer (CPT) system for the UAV, a constant voltage/current CPT system with lightweight characteristics for the UAV is proposed. Firstly, a capacitive coupler with strong anti-offset tolerance for the CPT system is proposed, and the coupling performance and equivalent model are studied. Secondly, the switching strategy for constant voltage/current output is studied based on the T-π type compensation circuit, without additional compensating elements. Finally, a simulation model and a test prototype are built to verify the feasibility and effectiveness of the proposed system. The results show that the system achieved a constant voltage output of 60V and a constant current output of 2A. The rate of change of the output voltage and current is less than 5% when the capacitive coupler is offset by ±100mm, the rate of that is less than 6% when the load changes. The switching strategy proposed in this paper has obvious lightweight advantages and could serve as a reference for designing the CPT system for the UAV.

This paper analyzes the dynamic characteristics of wireless power transfer systems based on LCC-LCC topology. By controlling the input current of the primary compensation network, the Active Disturbance Rejection Control (ADRC) Algorithm is used to realize the voltage output of the secondary compensation network indirectly, which improves the dynamic response of load voltage and anti-interference ability. Firstly, the small signal model of the system is obtained by using the generalized state-space average method. On this basis, the transient characteristics of the Wireless Power Transfer (WPT) system are analyzed and the consistency of the transient performance of the primary current and the secondary voltage is demonstrated. Secondly, the Active Disturbance Rejection Control (ADRC) strategy based on the primary side current of the Wireless Power Transfer (WPT) system is proposed and the parameter calculation rules of the controller are given. Finally, an experimental platform was built to demonstrate the theoretical analysis. The experimental result demonstrated that the proposed Active Disturbance Rejection Control (ADRC) strategy can achieve a stable output of load voltage with the response time of about 1.61ms and the voltage fluctuation of about 2V.

To meet the demand for constant current and constant voltage charging of batteries and to increase the system output power, the LCC-LCL/S-type self-switching wireless power transfer system is proposed. The system does not require communication between the primary and secondary circuits, and its output mode is controlled by simply changing the status of two switches on the secondary side. Notably, the system satisfies the zero phase angle characteristic before and after mode switching. The parameter design method is proposed based on the circuit topology and the maximum safe current constraint. To make the output voltage fluctuation as small as possible, the optimum load switching point for the system has been designed, and its optimality has been validated by simulation. Furthermore, the switching control strategy is proposed, considering the effects of the system no-load and load short-circuit in real situations. Finally, an experimental platform was built to achieve the high efficiency output of the system with the maximum output voltage of 46.21 V, the maximum output power of 180 W, and the maximum efficiency of 93.4%, which verified the applicability of the proposed method.

This paper proposes a novel double-mosquito combination (DMC) coil for inductive wireless power transfer (IPT) systems to improve their anti-misalignment capability. The DMC coil consists of a mosquito coil with single-turn spacing and a tightly wound close-wound coil. By superimposing the magnetic fields generated by both coils, a relatively uniform magnetic field distribution is achieved on the receiving coil plane. This approach addresses the challenges of significant output voltage fluctuations and reduced transmission efficiencies caused by coupling coil misalignments in conventional IPT systems. To further optimize the DMC coil, an interaction law between its parameters and the mutual inductance is established, setting the coil mutual inductance fluctuation rate as the optimization objective, and using the coil turn spacing, number of turns, and outer diameter as constraint conditions. The beetle antennae search algorithm (BAS) is employed to enhance the whale optimization algorithm (WOA), facilitating the adaptive optimization of the coil parameters. An experimental IPT system platform with a 50 mm transmission distance is developed to validate the robust anti-misalignment capability of the proposed coil. The results demonstrate that within a horizontal misalignment range of 50 mm, the system’s output voltage fluctuation rate stays below 7.4%, and the transmission efficiency remains above 83%.

A compound anti-interference control method based on a high-order nonlinear disturbance observer (HONDO) is proposed to address the impact of system disturbances on output voltage when applying the Buck–Boost converter in a microgrid to provide power to loads. Initially, the dynamic circuit model of the Buck–Boost converter is formulated, taking into account the system disturbance. Subsequently, HONDOs are designed to provide real-time estimates of uncertain factors in both the voltage loop and current loop of the circuit. These estimates are then utilized to design backstepping controllers aimed at effectively tracking the load output voltage set point. The simulation and experimental findings indicate that, when faced with load mutations, input voltage variations, and uncertainties in system parameters, the proposed compound anti-interference control method outperforms traditional control techniques by offering superior response speed, broader disturbance estimation capabilities, and enhanced dynamic performance of the Buck–Boost converter.