Hybrid Interference Field Mitigation of Dual-Rectangular Transmitter Pad for Universal Wireless Charging Area Expansion

SummaryWith the increasing demand for the constant voltage (CV) charging of multiple loads, this article proposes an LC compensated wireless power transfer (WPT) system with multiple load‐independent CV outputs function. Each transmission channel consists of a compensation capacitor and a compensation inductor forming a resonant loop. By configuring different combinations of compensation inductor and capacitor for each transmission channel, different CV outputs can be achieved without affecting the output voltages of other transmission channels. In addition, the proposed system can achieve near zero phase angle (ZPA) and zero‐voltage switching (ZVS) operations, thereby improving system efficiency. Firstly, a detailed theoretical derivation of the proposed system with multiple load‐independent CV outputs and ZPA operation is performed, and the detailed parameter design process is provided. Secondly, the implementation method of ZVS operation is introduced and verified through simulation. Finally, an experimental prototype of two transmission channels is taken as an example to verify the correctness and rationality of the proposed system.

Design and development of an LC compensated WPT system with multiple constant voltage outputs function

Sang,

Wang,

Yang

et al. 2024

A CV‐type WPT system based on CLC‐N compensation with compact receiver

Wang,

Sun,

2024

The demand for wireless power transfer (WPT) systems that can maintain a constant voltage (CV) output characteristic is gradually increasing in some practical application areas of WPT, such as industrial power supplies. However, existing CV‐type systems are often limited by the parameter design of the loosely coupled transformer (LCT), and the configuration of the receiver side is not compact enough. Therefore, this paper proposes a strongly coupled system with a CV output function composed of capacitor‐inductor‐capacitor‐none (CLC‐N) topology. The system's transmitter uses a CLC compensation, while the receiver conforms to a minimalist design without the need for compensation components such as capacitors and inductors. The initial segment of the paper pertains to the discussion of the conditions required to satisfy both the zero‐phase‐angle (ZPA) and CV output functionality of the suggested system. Subsequently, an in‐depth approach to parameter design is outlined, accentuating that the output voltage remains unrestricted by the LCT's parameters. Additionally, this paper examines the realization of zero‐voltage switching (ZVS) within the suggested system as well as the influence that variations in compensation components have on the CV output function. To underscore the benefits of the suggested CV‐type WPT system that employs CLC‐N compensation, the paper presents a comparison with a range of other CV‐type WPT systems. Ultimately, an experimental prototype is fabricated to test the theoretical framework, and the results from these experiments confirm the feasibility of the suggested CV‐type WPT system based on CLC‐N compensation.

A multi‐tap‐receiver based wireless power transfer system with multiple independent outputs and reduced wire length

Wu,

Zhang,

Hou

et al. 2024

Multiple independent outputs are highly desirable to power the different ports in some power distribution wireless power transfer (WPT) systems. This paper develops a WPT system with one transmitter coil and one multi‐tap‐receiver coil to generate multiple independent output voltages. The systems with dual‐tap‐receiver, three‐tap‐receiver, and multiple‐tap‐receiver are analyzed in theory. Because the sub‐windings of the multi‐tap‐receiver can be reused in positive series, the wire length of the receiver (WLR) is reduced compared to the system with multi‐independent receivers. For instance, a multiple outputs system needs N voltage levels (v1, v2, …, vN) while the receiver has N sub‐windings (LS1, LS2, …, LSN), then the voltage level vi (1 ≤ i ≤ N) is powered by sub‐windings LS1, LS2, …, LSi. Hence, the highest voltage level is fed with the entire charge included in the whole receiver, and a part of the sub‐windings supplies low‐voltage levels. The proposed system reduces WLR by more than 32.77% while v2/v1 is 2:1, and under the condition that v3/v2/v1 is 3:2:1, the saved WLR is higher than 75.73%. Besides, an 880‐W prototype with a dual‐tap receiver is built. The experimental results verify that the dual output voltages are load‐independent and non‐interfering. The efficiency is higher than 93.259%.