Backscattering technique for real‐time monitoring of the received power in wireless power transmission systems

Zarifi, Telnaz; Moez, Kambiz; Mousavi, Pedram

doi:10.1002/mop.30189

Cited by 1 publication

(2 citation statements)

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“…2). This structure, a spiral inductance with wire length of λ/4 of the operational frequency with one signal terminal and one open-ended terminal, has less practical challenges than the Hertz antenna in implementation and satisfies the requirements for low frequency power and signal transmission in midrange applications [18]- [21].…”

Section: Fig 1 Schematic Of the Proposed Wpt Systemmentioning

confidence: 98%

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Impedance matching network for ground eliminated open‐ended resonant coil structure in distributed wireless power transmission systems

Zarifi

Moez

Mousavi

2017

IET Science, Measurement & Technology

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This paper reports a novel technique utilizing a standing-wave node as a virtual ground to implement an impedance matching network and power level tuning in a ground eliminated (GE) open-ended resonant coil structure. This technique with GE open-ended coils can potentially be used in wireless power transmission (WPT) systems, where an unknown metallic, ungrounded, arbitrary environment is used as a signal propagation medium to deliver electric power to several distributed nodes. To satisfy WPT standards the proposed resonant WPT system with the matching network is implemented and tested at 13.56 MHz. A comprehensive study of the GE open-ended resonant coil structure demonstrates ground plane effects and the necessity of an impedance matching network in no-ground signal situations. The experimental results confirm the theoretical analysis presenting 9 % improvements in mismatch efficiency, and 13.1 times in power transmission efficiency at 13.56 MHz when the matching network is deployed. Index Terms-matching network, virtual ground, ground eliminated open-ended coil, resonance inductive coupling, wireless power transmission, wireless sensor network. I. INTRODUCTION Wireless power transmission technology offers a wide range of industrial and biomedical applications and could lead to clean sources of electricity for a variety of users[1]. WPT involves the transmission of energy from a power source to an electrical load across an air gap, without electrical connectors such as wires. Among different WPT techniques, resonant inductive coupling (RIC) is more popular in mid-range (less than two times of coil's diameter size) applications since it has demonstrated higher efficiency in power transmission for long distances than the inductive or capacitive coupling ones[2]. In RIC methods, the transmitter (Tx) and receiver (Rx) coils are coupled in their resonant mode while the magnetic field between them transfers power from the Tx to Rx coil[2]-[6]. WPT has also demonstrated extensive potential in wireless sensor network (WSN) applications. WSNs have been used in industrial environments and demonstrate impressive performance in applications that require real-time, distributed, multiparameter measurements. WSN systems have also brought, flexibility, high performance and lower cost to sensing devices and systems[7]-[10]. Since WSN systems have distributed structures, supplying the electric power to the sensor nodes is a limiting factor. Using high capacitive batteries, the widespread primary solution, can provide the required electric energy but the power management required to achieve high sensor node performance is challenging and requires regular maintenance and battery replacement[11], [12]. WPT is an effective technique to deliver permanent electric power to WSN nodes while maintaining a wireless data communication link. The main challenge in WPT systems with distributed receiver loads is the physical distance between the power transmitter and the receiver node, where in large distances less power is received by receiv...

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Section: Fig 1 Schematic Of the Proposed Wpt Systemmentioning

confidence: 98%

“…We have recently proposed a technique [15][16][17][18], where nongrounded metallic structures can be used as electric power and signal propagation medium to deliver electric power locally to the Rx nodes when they are in vicinity of the metallic structure ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%