Maximum Efficiency Tracking and Improved Active Disturbance Rejection Composite Control Strategy for IPT System

This paper proposes a combined maximum efficiency tracking and improved active disturbance rejection control (ADRC) strategy for an inductive power transfer (IPT) system, addressing issues of reduced efficiency and voltage fluctuations under load variations. The transmission characteristics of the inductor–capacitor–capacitor and series (LCC-S) IPT system are analyzed, and the relationship between transmission efficiency and the secondary DC-DC converter’s duty cycle is derived. Maximum efficiency tracking is achieved by adjusting the secondary converter’s duty cycle via the primary side Buck converter. An improved ADRC controller enhances dynamic voltage regulation by reducing the extended state observer’s order and incorporating model information for better disturbance compensation. Experimental results show that the proposed approach improves average transmission efficiency by 12% and maintains constant output voltage under varying loads. The controller requires fewer parameters than linear active disturbance rejection control (LADRC), with faster responses and smaller voltage fluctuations than PI and LADRC controllers.