## 1 Introduction
However, it contains many passive components, resulting in a complex structure. References [22; 23] achieved the driving of two or even multiple transmitting coils by adding switches at the inverter output end, but this increased the number of switching devices, and the two transmitting coils in reference [23] can only be driven alternately and cannot be driven simultaneously. Reference [24] proposed a single-input dual-output direct AC-AC converter that can directly convert 50 Hz AC into two high-frequency ACs, thereby reducing the number of converters and improving the transmission efficiency of the dual-transmitter WPT system. However, the two outputs cannot be controlled independently, and closed-loop control is required to achieve stable DC current output. Overall, research on multi-output inverters has made some progress, but there are still many problems and challenges. (1) The existing inverters have limited adaptability to various loads, which limits the flexibility and degrees of freedom of the system. (2) The topology design of inverters is complex, with higher requirements for stability and reliability, which increases the design difficulty. (3) Insufficient output regulation capability makes it difficult to achieve precise control. (4) The system is susceptible to parameter accuracy, and minor deviations may affect its efficiency and stability. Therefore, this article proposes a multi-output inverter to address these issues. The proposed inverter can significantly reduce the required number of power switches while maintaining a constant output, simplify the control system design, and improve the overall stability and reliability of multi-load WPT systems. In addition, by introducing different resonant compensation networks to adapt to the different charging requirements of multiple loads, the system's ability to support different types and quantities of loads can be effectively expanded, and its application scope can be extended, such as wireless charging desktops, multi-load charging stations, smart homes, etc. It can simultaneously supply power to various wireless charging devices. In Section 2 of this paper, the topology structure and output extension method of the proposed multi-output inverter are elaborated, and its operating principle is introduced. In Section 3, a corresponding mathematical model is constructed to analyze the operating characteristics of the proposed inverter. Then, it is compared with existing multi-output inverters, and its parameters are designed. In Section 4, a selection analysis is conducted on the resonant network of the system, and the output power that the proposed inverter can provide at each output terminal under different resonant networks is calculated, aiming to achieve the optimal configuration combination of diversified output characteristics and efficient power transfer. In Section 5, simulation is conducted based on the simulation model, and experimental testing is carried out by an experimental setup. The correctness of the proposed inverter, the feasibility of its application, and the superiority of controllable multi-output are demonstrated through simulation and experiments. Finally, a conclusion is presented in Section 6.