Investigation of Single-Input Multiple-Output Wireless Power Transfer Systems Based on Optimization of Receiver Loads for Maximum Efficiencies

Abstract

In this paper, the efficiency of single-input multiple-output (SIMO) wireless power transfer systems is examined. Closed-form solutions for the receiver loads that maximize either the total efficiency or the efficiency for a specific receiver are derived. They are validated with the solutions obtained using genetic algorithm (GA) optimization. The optimum load values required to maximize the total efficiency are found to be identical for all the receivers. Alternatively, the loads of receivers can be adjusted to deliver power selectively to a receiver of interest. The total efficiency is not significantly affected by this selective power distribution. A SIMO system is fabricated and tested; the measured efficiency matches closely with the efficiency obtained from the theory.

Frequency Bifurcation Conditions for Capacitive Wireless Power Transfer with Multiple Receivers

“…However, several factors indicate a future need to charge multiple receivers simultaneously. For example, the rise of internet of things applications and the electrification of transport and industry opens the door to powering several devices by a single transmitter [9]- [11]. Obviously, a coupling-independent mode would also be desirable for multiple receivers.…”

Transmission Distance Improvement of a Two-Coil Magnetic Resonance Wireless Power Transmission System Using Transformers

“…Wireless power transmission (WPT) is a promising technology used in charging electric devices such as mobile phones, tablet, and electric vehicles [1][2][3]. Two-types of WPT technology have been studied: a magnetic resonance method and an inductive coupling method [4].…”

Design of Wireless Power and Information Transfer Systems Considering Figure of Merit for Information

“…Wireless power transfer (WPT) based on inductively coupled resonance was first introduced in [1], where an efficiency of about 40% was achieved with a separation of approximately 2 m between Tx and Rx of spiral shapes. Since then, the inductively coupled resonant WPT technology has been developed in theory and also applied to many applications including WPTs to multiple receivers, electric mobile phones, home appliances, motor vehicles, biomedical devices, and so on [2][3][4][5][6]. In most practical WPT devices, the information of power-receiving units needs to be transferred to power-transmitting units.…”