Abstract
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 100% deviation from the intended transfer power as opposed to 8.1% for orthogonal codes in CDMA.
Highlights
W IRELESS power transfer (WPT) is proliferating with applications that include charging of electric vehicles [1] [2], biomedical devices [3], robots [4], and electronic devices [5]
To understand code division multiple access (CDMA)-WPT, we extend the concept of power factor to include voltage sources encoded as digital codes
We present a framework for Code Division Multiple Access Wireless Power Transfer
Summary
W IRELESS power transfer (WPT) is proliferating with applications that include charging of electric vehicles [1] [2], biomedical devices [3], robots [4], and electronic devices [5]. This is complemented by a rapid advancement in the fields of communication, sensing, and computation resulting in a densely connected networks of electronic devices. The focus of the research is on the more general case of mutable multiple access WPT, which we will refer to as “multiple access WPT” for convenience
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