## 1 Introduction  
Wireless power transfer (WPT) technology uses non-contact media such as electric fields, magnetic fields, and microwaves to transmit power. It leaps from wired to wireless transmission of power and significantly changes the way power is utilized, bringing convenience to modern social life and industrial applications. Since it has the characteristics of flexibility, safety, and convenience [1; 2; 3; 4; 5], it is currently widely used in fields such as smart homes, medical electronic devices, industrial robots, and transportation [6; 7; 8; 9]. At present, the mainstream wireless charging solutions on the market are primarily one-to-one dedicated designs, which means that each load needs to be equipped with a dedicated wireless charger that is compatible with it. The chargers are not interchangeable with each other. Due to the varying voltage, current, and power requirements of various loads, the limitations of traditional one-on-one dedicated charging modes are becoming increasingly apparent, especially in the scenario of multi-load wireless charging, which faces problems such as rising costs, resource waste, and charging efficiency being easily affected by load location. To solve such problems, the scientific research community actively explores multi-load wireless charging technology, aiming to enable multiple loads to share the same wireless charger by designing different system topologies [10; 11]. However, the current multi-load wireless charging technology still faces many challenges, such as complex system topology and control mechanisms, low reliability, and limitations on the number of loads. In WPT systems, inverters play a core role, and their performance directly affects the efficiency and stability of the system. For multi-load application scenarios, the design of multi-output inverters is particularly critical. It can generate multiple independent outputs and effectively solve load-matching and power allocation problems [12]. In recent years, extensive research has been conducted on multi-output inverters both domestically and internationally. Reference [13] introduced a dual-output inverter suitable for dynamic WPT systems, which can generate two identical outputs to drive two transmitting coils simultaneously. Thanks to its innovative topology, it effectively reduces the number of inverters and the complexity of the system. However, its output independence and controllability are relatively poor. Reference [14] proposed an independent controllable dual-output inverter that can generate two independently controllable and wide-range outputs, achieving on-demand independent driving and the fast and smooth switching of two transmitting coils, thus simplifying the design and control difficulty of the system. Reference [15] designed a multi-leg inverter based on a full bridge inverter by improving the output structure, consisting of one common leg and \(n\) selectable legs, to achieve multiple outputs. This inverter can flexibly drive multiple transmission coils according to the actual load power supply requirements. Compared with a full bridge inverter, it can reduce nearly half of the power switches when driving the same number of transmission coils [16]. However, the current stress of the common leg is high, and the redundancy of the inverter is low. References [17; 18; 19] proposed a type of single-inductor multiple-output inverter for driving multiple transmitting coils, which can reduce the number of inductors and power switches, has high power density and scalability, and each output can be controlled independently. However, its switching frequency needs to increase proportionally with the increase in output quantity, resulting in excessive switching losses. References [20; 21] proposed a novel inverter topology with independent dual coil driving capability, in which the main power switch and auxiliary power switch can drive two independent coils. It provides a wide zero voltage switching range and compact size and improves output power and coil utilization.