Underground Communications Using Capacitive Data Transfer Devices

Zang, Shaoge; Hou, Keran; Nguang, Sing Kiong

doi:10.1155/2020/8849618

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…It provides low voltage stress compared with the class E inverter structure. The push-pull converter is involved in autonomous structure for comparison with class E converter in terms of performance characteristics [163] and the purpose of underground data transmission [164]. A single switch quasi-resonant converter is then proposed to reduce the losses and cost [165].…”

Section: ) Invertersmentioning

confidence: 99%

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

et al. 2022

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Capacitive power transfer (CPT) technology is becoming increasingly popular in various application areas. Due to its limitations, such as low frequency, low coupling capacitance, and the high voltage stress on metal plates, the studies on high power CPT applications fell behind previously. Therefore, the wideband gap (WBG) semiconductor devices and the compensation topologies are further adopted to tackle these limitations. The main purpose of the paper is to review CPT applications in terms of performance parameters, advantages, disadvantages and also challenges. Initially, the basic principles of CPT technology are examined, which cover compensation topologies, coupler structures, transfer distance, power electronic components, and system control methods. Then, CPT applications are evaluated for performance parameters (i.e., power level, operation frequency, system efficiency, transfer distance) along with compensation types, inverter types, and coupler types. The applications are categorized into six main groups according to industrial topics as safety, consumer electronics, transport, electric machines, biomedical, and miscellaneous. Herein, power level changes from µW to kW ranges, the operation frequency varies from 100s of kHz to 10s of MHz ranges as well. The maximum system efficiency is recorded as 97.1 %. The transfer distance varies from µm range to 100s of mm ranges. The full-bridge inverter topology and four-plate coupler structure are noticeable in CPT applications. Finally, advantages, disadvantages, and challenges of CPT applications are evaluated in detail. This review is expected to serve as a reference for researchers who study on CPT systems and their applications.INDEX TERMS Capacitive power transfer, capacitive coupling, wireless power transfer.MEHMET ZAHID EREL was born in Sakarya, Turkey. He received the B.S. degree in electrical engineering from the Yildiz Technical University, Istanbul, Turkey, in 2013, and the M.S. degree in electronics and communication engineering from the Ankara Yildirim Beyazit University, Ankara, Turkey, in 2016. He is currently pursuing the Ph.D. degree with the department of electrical and electronics engineering,

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Section: ) Invertersmentioning

confidence: 99%

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

et al. 2022

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“…The disturbance caused by the data signal modulation leads to drops in power transfer efficiency and power transfer capability. Works in [5]- [7] are designed for low power applications like sensors and bio-implants and have poor power transfer efficiency. In [8], it achieved a full-duplex communication CPT system rated at 100W , but the data channel must be carefully designed to maintain a desired signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

Capacitive Power Transfer System With Integrated Wide Bandwidth Communication

Zang

Zhu

Zhao

et al. 2022

IEEE Trans. Power Electron.

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This letter proposed a novel method for compensation network design used in Capacitive Power Transfer (CPT) systems to achieve simultaneous power and data delivery. The proposed method combines both ladder filter and resonant circuit designs, allowing the existing double-sided CL compensation topology to exhibit different characteristics under the power channel and the communication channel. The proposed system significantly reduces the design complexity and increases the bandwidth for data transfer while maintaining the circuit resonance at the wireless power transfer frequency. The system is compatible with both Amplitude Shift Keying (ASK) and Frequency Shift Keying (FSK) modulation methods, passing the high frequency data carrier with an approximately unity gain. Detailed circuit parameter design and system performance analysis are presented, and a new metric Power to Signal (PSR) is introduced to analyze the effect of the data communication on the power transfer. A prototype CPT system rated at 10W is built, which demonstrates a 81.2% DC-AC efficiency and a data transfer rate of 10kbps by using either ASK or FSK modulation techniques.

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“…The sensor is powered by a built-in lithiumpolymer rechargeable battery charged by a solar panel (see Figure 1(a)). Also, a built-in GPS module with wireless communication function allows the traceability of collected data [13]. Users are able to check the real-time SWC data using their PC or cellphones.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Accuracy of an FDR Sensor in Soil Moisture Measurement under Laboratory and Field Conditions

et al. 2021

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Soil water content (SWC, % vol) is a key factor affecting plant growth and development. SWC measurement is vital to rational use of water resources for irrigation, and the accuracy of sensors in SWC measurement is of significant importance to smart data-driven irrigation. Here, a laboratory experiment and a field lysimetric experiment were conducted to evaluate the accuracy of Insentek sensors under various soil conditions (1.1 to 1.5 bulk densities and sand to clay soil textures) and irrigation levels (30, 45, and 60 mm), in 2018 and 2019. A microweighing lysimeter and oven-drying method were used as standard methods to compare the Insentek method. The root mean square error (RMSE, % vol) and relative prediction deviation (RPD) between the Insentek and microlysimetric SWC values were 0.89–1.04% vol and 5.6–6.8, respectively, under laboratory condition. The RPD value is larger than the threshold value of 4.0, indicating the accuracy of the Insentek sensors is reliable under laboratory condition. Except for 60 mm irrigation treatment, the RMSE between Insentek and the oven-drying method under field condition was 1.44–1.93% vol, and the RPD value was 1.56–1.93, lower than the threshold value of 4.0. The tiny gap between the Insentek sensor and soil may accelerate water infiltration along the probe 0-3 d after irrigation while increase air filling 5–7 d after irrigation, causing greater RMSE and lower RPD values. The dissatisfied performance in field condition may also be associated with the obvious drawbacks of oven-drying method, such as disturbance in soil sampling. When using oven-drying method to analyze the accuracy of the Insentek sensors in field condition, the concerns should be well addressed.

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Underground Communications Using Capacitive Data Transfer Devices

Cited by 4 publications

References 18 publications

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

A Comprehensive Review on Wireless Capacitive Power Transfer Technology: Fundamentals and Applications

Capacitive Power Transfer System With Integrated Wide Bandwidth Communication

Analysis of the Accuracy of an FDR Sensor in Soil Moisture Measurement under Laboratory and Field Conditions

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