A Framework for Code Division Multiple Access Wireless Power Transfer

The availability of energy is one of the major hindrances to unlocking the massive potential of electronic devices. Powering a highly connected network of devices requires multiple access and a wireless power transfer (WPT) solution that is scalable and capable of maintaining a constant power flow r...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.135079-135101
Main Authors: Sarin, Akshay, Avestruz, Al-Thaddeus
Format: Article
Language:English
Subjects:
Co-design
Code Division Multiple Access
code division multiple access (CDMA)
Codes
current-mode class-D (CMCD)
Frequency division multiaccess
Hardware
high-efficiency
Interference
Internet of Things (IoT)
power amplifier
Power flow
Receivers
Reconfiguration
resonant converter
Time division multiple access
Time-frequency analysis
Topology
Transceivers
Transmitters
Wireless power transfer (WPT)
Wireless power transmission
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Summary:The availability of energy is one of the major hindrances to unlocking the massive potential of electronic devices. Powering a highly connected network of devices requires multiple access and a wireless power transfer (WPT) solution that is scalable and capable of maintaining a constant power flow regardless of reconfiguration (mutability) and electromagnetic environment (power flow selectivity). In this paper, we present a framework for the implementation of code division multiple access wireless power transfer (CDMA-WPT) for enabling WPT among multiple transmitters and multiple receivers simultaneously. CDMA-WPT maintains power flow selectivity and is easily scalable. An inverter/rectifier topology is presented for the hardware implementation of CDMA-WPT. A design process for practical co-design of high-performance hardware and obtaining a code set is also presented. We demonstrate the hardware implementation of CDMA-WPT using two transmitters and two receivers maintaining a nearly constant 5W operation with nearly 75% dc-dc efficiency, and four transmitters and four receivers maintaining a constant 4W operating with greater than 70% dc-dc efficiency. This paper is accompanied by a video hardware demonstration in real-time the difference between using orthogonal codes in CDMA versus conventional single-frequency WPT using 4 transmitter-receiver pairs; conventional single-frequency WPT shows up to a 82% deviation from the intended transfer power as opposed to 8.1% for orthogonal codes in CDMA.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3116114