Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055688
Xiaoqiang Gu, S. Hemour, Ke Wu
Conversion loss performance of fully passive harmonic transponders, which is drastically affected by low power mixing operation, determines their detection ranges directly. This work presents both theoretical and experimental studies of thermal effects on the performance of fully passive harmonic transponders. For the zero bias Schottky diode-based harmonic transponder, it is found that a lower temperature can lead to a larger detection range of the transponder in the power range of interest (≤-30 dBm). The conversion loss decreases by around 3.25 dB when the temperature goes down to -20°C compared to the loss performance at +30 °C. In other words, the theoretical figure-of- merit maximum detection range has been enlarged by about 19.3 %. This work also highlights the opportunity of operating the Internet of Things transponders in winter, as thermal conditions play an important role in the design of nonlinear component-based devices to achieve higher reliability and better performance.
{"title":"Improving Conversion Loss Performance of Fully Passive Harmonic Transponder at Low Temperature","authors":"Xiaoqiang Gu, S. Hemour, Ke Wu","doi":"10.1109/WPTC45513.2019.9055688","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055688","url":null,"abstract":"Conversion loss performance of fully passive harmonic transponders, which is drastically affected by low power mixing operation, determines their detection ranges directly. This work presents both theoretical and experimental studies of thermal effects on the performance of fully passive harmonic transponders. For the zero bias Schottky diode-based harmonic transponder, it is found that a lower temperature can lead to a larger detection range of the transponder in the power range of interest (≤-30 dBm). The conversion loss decreases by around 3.25 dB when the temperature goes down to -20°C compared to the loss performance at +30 °C. In other words, the theoretical figure-of- merit maximum detection range has been enlarged by about 19.3 %. This work also highlights the opportunity of operating the Internet of Things transponders in winter, as thermal conditions play an important role in the design of nonlinear component-based devices to achieve higher reliability and better performance.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124551437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055578
J. Tissier, M. Koohestani, M. Latrach
A comparative study among the four commonly used rectifier topologies in literature was presented with the aim of indicating which one yields the maximum RF-to-DC power conversion efficiency for low power RF energy harvesting. For a fair comparison, source-pull simulations were conducted to extract the optimal diode input impedance and to further provide the maximized efficiency for a given RF input power, frequency, and load value. It was shown that, independently of frequency, a single diode topology leads to a better efficiency at low RF powers (< −15 dBm), whereas, a doubler topology provides a larger power dynamics.
{"title":"A Comparative Study of Conventional Rectifier Topologies for Low Power RF Energy Harvesting","authors":"J. Tissier, M. Koohestani, M. Latrach","doi":"10.1109/WPTC45513.2019.9055578","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055578","url":null,"abstract":"A comparative study among the four commonly used rectifier topologies in literature was presented with the aim of indicating which one yields the maximum RF-to-DC power conversion efficiency for low power RF energy harvesting. For a fair comparison, source-pull simulations were conducted to extract the optimal diode input impedance and to further provide the maximized efficiency for a given RF input power, frequency, and load value. It was shown that, independently of frequency, a single diode topology leads to a better efficiency at low RF powers (< −15 dBm), whereas, a doubler topology provides a larger power dynamics.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128003467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/wptc45513.2019.9055521
Program: Wireless Power Week 2019
节目:2019年无线能源周
{"title":"Program: Wireless Power Week 2019","authors":"","doi":"10.1109/wptc45513.2019.9055521","DOIUrl":"https://doi.org/10.1109/wptc45513.2019.9055521","url":null,"abstract":"Program: Wireless Power Week 2019","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121258859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055687
Shuoliang Ding, S. Koulouridis, L. Pichon
In this paper, a complete RF to DC wireless power transmission implantable rectenna system is presented. For simplicity, an external half-wave dipole at Industrial, Scientific and Medical bands (ISM 902.8-928 MHz) is selected as an energy emitter from outside human body. An embedded circular dipole antenna receives the energy and then converts it to DC power by a rectifying circuit. The structure of the system is discussed in details. Finally, the rectifying efficiency and the global system's efficiency are examined for different external antenna to human body distances, different embedded depth and various levels of circuit's input power.
{"title":"Implantable rectenna system for biomedical wireless applications","authors":"Shuoliang Ding, S. Koulouridis, L. Pichon","doi":"10.1109/WPTC45513.2019.9055687","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055687","url":null,"abstract":"In this paper, a complete RF to DC wireless power transmission implantable rectenna system is presented. For simplicity, an external half-wave dipole at Industrial, Scientific and Medical bands (ISM 902.8-928 MHz) is selected as an energy emitter from outside human body. An embedded circular dipole antenna receives the energy and then converts it to DC power by a rectifying circuit. The structure of the system is discussed in details. Finally, the rectifying efficiency and the global system's efficiency are examined for different external antenna to human body distances, different embedded depth and various levels of circuit's input power.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115958937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055685
J. Hora, Aileen Chris Arellano, Xi Zhu, E. Dutkiewicz
A buck converter design with an automatic power-down technique and dead-time control system intended for low power application such as a wireless sensor network is proposed. With an input voltage range of 1V to 1.2V, the buck converter regulated the output voltage at 0.8V. This buck converter operates in a pulse-width modulation technique at load current range of 1mA-100mA. The output voltage ripple measured is 7.5 m V with the peak efficiency is 94.98 %. The quiescent current $(mathrm{I}_{mathrm{q}})$ of this proposed design is about $5mu mathrm{A}$. The line and load regulation is 0.195 mV/V and 0.61mV/mA, respectively. The circuit core layout dimension is $179 mumathrm{m}$ and $120mu mathrm{m}$ 65nm CMOS technology.
{"title":"Design of Buck Converter with Dead-time Control and Automatic Power-Down System for WSN Application","authors":"J. Hora, Aileen Chris Arellano, Xi Zhu, E. Dutkiewicz","doi":"10.1109/WPTC45513.2019.9055685","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055685","url":null,"abstract":"A buck converter design with an automatic power-down technique and dead-time control system intended for low power application such as a wireless sensor network is proposed. With an input voltage range of 1V to 1.2V, the buck converter regulated the output voltage at 0.8V. This buck converter operates in a pulse-width modulation technique at load current range of 1mA-100mA. The output voltage ripple measured is 7.5 m V with the peak efficiency is 94.98 %. The quiescent current $(mathrm{I}_{mathrm{q}})$ of this proposed design is about $5mu mathrm{A}$. The line and load regulation is 0.195 mV/V and 0.61mV/mA, respectively. The circuit core layout dimension is $179 mumathrm{m}$ and $120mu mathrm{m}$ 65nm CMOS technology.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116120671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055663
H. Pflug, H. Visser
A time trajectory technique is presented as a tool to obtain time variant impedance insight, applied to far-field energy harvesting rectifiers. By combining this with an accurate equivalent diode model, more efficient rectifier circuits have been identified and measured. The time domain technique provides another view to non-linear circuits next to frequency domain methods, especially for non-constant envelope signals.
{"title":"Time Trajectory Rectifier Impedance Analysis","authors":"H. Pflug, H. Visser","doi":"10.1109/WPTC45513.2019.9055663","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055663","url":null,"abstract":"A time trajectory technique is presented as a tool to obtain time variant impedance insight, applied to far-field energy harvesting rectifiers. By combining this with an accurate equivalent diode model, more efficient rectifier circuits have been identified and measured. The time domain technique provides another view to non-linear circuits next to frequency domain methods, especially for non-constant envelope signals.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116676838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055646
A. Pokryvailo, H. Dave
Inductive Power Transfer grew to be a hot topic as reflected by monographs and thousands of papers published mainly last decade. We complement the bulk of research by harnessing power of coupled magnetic field-circuit simulations on examples of virtually air-core high-potential transformers. Circuit analysis, on the base of simplified equivalent circuits is performed. A comparison is made to Tesla transformer. Major impediment here is modeling ferromagnetic parts of the system. Thus, circuit analysis is mostly helpful for a qualitative grasp of the problem. The design is greatly simplified by coupling the magnetic field of the transformer to external circuitry. We do it on a COMSOL platform. Sweeping number of turns, height of the windings, values of resonant capacitors, etc., we can arrive to an optimal design point. Most of the simulations were done in frequency domain. Following this procedure, we built and extensively characterized several 20-kV, 1-kW transformers with high-potential insulation sized to 150 kV in a wide range of switching frequencies centered around 50 kHz. A transformer of choice was tested at high voltage (HV) and nominal power in ambient air. The transformer efficiency was >92 %, with largest overheat of 50° C being on the primary.
{"title":"Coupled Magnetic Field-Circuit Analysis of Inductive Power Transfer in High-Potential Transformers","authors":"A. Pokryvailo, H. Dave","doi":"10.1109/WPTC45513.2019.9055646","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055646","url":null,"abstract":"Inductive Power Transfer grew to be a hot topic as reflected by monographs and thousands of papers published mainly last decade. We complement the bulk of research by harnessing power of coupled magnetic field-circuit simulations on examples of virtually air-core high-potential transformers. Circuit analysis, on the base of simplified equivalent circuits is performed. A comparison is made to Tesla transformer. Major impediment here is modeling ferromagnetic parts of the system. Thus, circuit analysis is mostly helpful for a qualitative grasp of the problem. The design is greatly simplified by coupling the magnetic field of the transformer to external circuitry. We do it on a COMSOL platform. Sweeping number of turns, height of the windings, values of resonant capacitors, etc., we can arrive to an optimal design point. Most of the simulations were done in frequency domain. Following this procedure, we built and extensively characterized several 20-kV, 1-kW transformers with high-potential insulation sized to 150 kV in a wide range of switching frequencies centered around 50 kHz. A transformer of choice was tested at high voltage (HV) and nominal power in ambient air. The transformer efficiency was >92 %, with largest overheat of 50° C being on the primary.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116988038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/wptc45513.2019.9055670
Wireless Power Week
无线能源周
{"title":"Wireless Power Week","authors":"","doi":"10.1109/wptc45513.2019.9055670","DOIUrl":"https://doi.org/10.1109/wptc45513.2019.9055670","url":null,"abstract":"Wireless Power Week","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115733285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055557
P. Mitcheson
Wireless Power Week
无线能源周
{"title":"Wireless Power Week","authors":"P. Mitcheson","doi":"10.1109/WPTC45513.2019.9055557","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055557","url":null,"abstract":"Wireless Power Week","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127202596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055564
P. Wiener, T. Shi
This paper presents a high-power wireless transfer system through a 200mm thick wall. This is applicable to IoT devices and 5G applications. The end to end efficiency is over 70% with 50W power. The transfer area is 50mm by 50mm with 270mm by 270mm coils The Class EF2 PA offers over 90% efficiency at 20ohm impedance. This system allows an outdoor unit (ODU) to be powered by an indoor unit without wire connection in the Air Fuel Alliance Resonant charging standards.
{"title":"A High Power WPT System for through the Wall Applications","authors":"P. Wiener, T. Shi","doi":"10.1109/WPTC45513.2019.9055564","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055564","url":null,"abstract":"This paper presents a high-power wireless transfer system through a 200mm thick wall. This is applicable to IoT devices and 5G applications. The end to end efficiency is over 70% with 50W power. The transfer area is 50mm by 50mm with 270mm by 270mm coils The Class EF2 PA offers over 90% efficiency at 20ohm impedance. This system allows an outdoor unit (ODU) to be powered by an indoor unit without wire connection in the Air Fuel Alliance Resonant charging standards.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126195680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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