For high-power, long-mileage dynamic wireless power transfer (DWPT) system, its economy and adaptability to complex working conditions are the main factors limiting its popularization and application. In this paper, the compensation and power supply of segmented rails are studied, and a DWPT system with mutual compensation of segmented power supply rails based on LCL topology is constructed. By multiplexing components, the number, cost and volume of devices are reduced, and the economy of the system is improved. The power supply topology is optimized to achieve constant-current characteristics over a wide load range to generate a stable high-frequency magnetic field in space and avoid short-circuit current induced by mutual coupling of adjacent rail. The resonant control conditions of the system are derived, and a phase shift control method based on the three-leg inverter is proposed to realize the full range regulation of transmitter current and output power, and improve the adaptability of the system. The characteristics of the proposed DWPT system have been verified by an experimental prototype.

A three-phase dynamic wireless charging system with balanced primary currents can yield a constant induced voltage. Compared with a three-phase primary and three-phase secondary (TT) system, a three-phase primary and single-phase secondary (TS) system has a simpler coil structure and circuit topology on the secondary side, but its reflected impedances are unbalanced among three phases and vary with position. In order to obtain balanced primary currents, the suitable three-phase inverter and compensation topology need to be studied. This paper accurately describes the unbalanced reflected impedances of the TS system and reveals its impedance characteristics varying with position. The three-phase LCC topology for TS system is provided to solve the problems of unbalanced and varying reflected impedances and the resonance conditions are also given. In addition, the corresponding topology and adjustment method of the inverter are proposed to ensure its balanced primary currents and constant induced voltage. Furthermore, a prototype was implemented to verify the topology and control method.

Wireless power transfer (WPT) technology offers a more convenient and safer alternative to traditional contact-based power supply methods. In many WPT systems, a two-stage receiver configuration, comprising a rectifier and a dc–dc converter, is commonly used. This article examines how the rectifier filter capacitance affects the output voltage of the buck converter in wireless power receiver system with input current source. Prior research often assumed a large capacitance, leading to a conclusion that the output voltage was unaffected by capacitance changes. However, this is not the case when the capacitance is intentionally reduced, causing the buck converter to switch from continuous voltage mode to discontinuous voltage mode, thereby linking the output voltage to the capacitance. Similar findings can be also observed in other dc–dc converters, such as the Boost converter. This article calculates the critical capacitance and output voltage for the buck converter in both continuous voltage mode and discontinuous voltage mode and develops small-signal models, providing design guidelines for rectifier filter capacitance. The theoretical findings are validated through simulation and experiments.

In wireless power transfer (WPT) systems, poststage dc–dc converters—such as buck converters—are commonly employed after the rectifier to achieve precise power regulation. This architecture effectively divides the system into two stages: the WPT transmission link at the front-end and the dc–dc converter at the back-end, interconnected via the dc link on the receiver side. However, if the switching frequencies of the two stages are improperly designed or lack coordination, the system may suffer from undesired low-frequency oscillations in voltage or current waveforms. This letter proposes a frequency design methodology to mitigate interstage dynamic interactions in WPTsystems. The underlying mechanisms of low-frequency oscillations are analyzed through steady-state circuit analysis and small-signal modeling. Based on these insights, a frequency planning strategy is developed to ensure system stability. Experimental results validate the proposed method, confirming its accuracy and effectiveness in practical applications.

In many applications of wireless power transfer (WPT) systems, there are situations where the transmitter needs to supply power to receivers of different frequencies or powers. Therefore, it is very important to improve its compatibility and adaptability. In this paper, a dual-frequency compatible WPT system with a single transmitter and multiple receivers is proposed. The transmitter current contains two main frequency components obtained by current modulation and resonance compensation. The receivers of different frequencies pick up the corresponding components by frequency selective resonance. Therefore, decoupled transfer and independent control can be achieved. In this paper, a dual-frequency compensation topology is constructed and an adjustment method for receiver power decoupling control is proposed. Through theoretical and experimental analysis, the efficacy characteristics of the system have been evaluated, and its dual-frequency compatibility and power decoupling control capability have been verified. Compared with the single-frequency multiple-receiver system, this system can avoid the problems of mutual coupling: induced output power and system efficiency reduction, transmitter detuning, reactive power increase and inverter output capacity reduction.

Expanding the application scenarios of wireless power transfer (WPT) systems demands increasingly stringent performance requirements. As a critical interface between the power source and load, the receiver topology plays a pivotal role in determining the system’s efficiency and stability. This review focuses on advancements in power electronic receiver designs for WPT systems, with an emphasis on two-stage and single-stage topologies. This article provides an overview of the current design status of power electronic topologies at the receiver in existing WPT systems, with a focus on analyzing the design ideas, implementation methods, and performance of two-stage and single-stage receivers. The advantages and disadvantages of various receiver topologies are discussed in detail, and corresponding strategies are proposed to address the new challenges associated with the stability of existing WPT systems.