Voltage transfer ratio analysis for multi‐receiver resonant power transfer systems

Abstract

The wireless power transfer characteristics of system architectures with single transmitter and multiple receiver coils are investigated. With multiple receivers in a limited space, couplings within receivers occur. Effective resonant frequency is changed due to such couplings, the desired working region should be adjusted accordingly. An equivalent circuit model is developed to describe the system with a single receiver, and extended to describe the system with two receivers. The circuit model yields transfer frequency responses that are in good agreement with experimental measurements over a range of frequencies that span the resonance. In a multi-receiver system, a method for tracking frequency shifts or retuning the lumped capacitance so as to maximise the efficiency is proposed. The simulation and experimental results well agree with the theoretical analysis.

Design and analysis of decoupled tetra‐polar ring‐coils for wireless power transfer in rotary mechanism applications

“…16a, the circuit loop of L pA is excited by a current of 2.5 A (peak). The corresponding OCV with the fundamental frequency 50 kHz is submerged in the switching noise, which means the fundamental (8) where U iB_OC and U oB_OC represent the OCV of L pB and L sB , respectively. Fig.…”

“…Therefore, IPT systems with multiple coils are proposed to improve the power transfer capacity by adopting low-cost and low-power devices. The inductive couplers of multi-coil IPT systems can be divided into three types: single-transmitter and multi-receiver [8], multi-transmitter and single-receiver [9], multi-transmitter and multi-receiver [10].…”

“…According to the expression of induction electromotive force in(8), the mutual inductance between L pA and L pB can also be neglected. Similarly, the mutual inductance between L sA and L sB is also negligible fromFig.…”

Design of a High-Power High-Efficiency Multi-Receiver Wireless Power Transfer System

“…Many literatures have investigated various aspects regarding multi-receiver WPT systems, such as efficiency optimization [1][2][3][4][5], multi-frequency WPT [6], transfer characteristics [7,8], energy encryption [9], omnidirectional WPT [10], cross coupling effect [11,12], reconfigurable WPT [13], and bidirectional power transfer [14]. To extend the application scope of multi-receiver WPT, the system should be more generalizable and robust with flexible receiver number and power levels.…”