Pub Date : 2019-06-01DOI: 10.1109/WPTC45513.2019.9055511
Diyang Gao, Rongpeng Zhai, P. Baltus, H. Visser, Hao Gao
This paper presents a 125 kHz wireless energy and 25 kbps data transfer system for a wearable device. In this system, the wireless transfer link is through a coupled transformer. The model of a coupled transformer is discussed, and the mismatch between measured and simulated coupling value is within 3 %. For a wearable scenario, the coupled transformer is designed to fit the bending degree of the wrist. The designed transformer achieves a best coupling factor of 0.42 with ±15mm displacement tolerance. The wireless data link can support 25 kbps data transfer in ASK modulation, and the system wireless power transfer link achieves a 40% efficiency in the optimized position, which fits the application requirement.
{"title":"125 kHz Wireless Energy and 25 kbps Data Transfer for Wearable Device","authors":"Diyang Gao, Rongpeng Zhai, P. Baltus, H. Visser, Hao Gao","doi":"10.1109/WPTC45513.2019.9055511","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055511","url":null,"abstract":"This paper presents a 125 kHz wireless energy and 25 kbps data transfer system for a wearable device. In this system, the wireless transfer link is through a coupled transformer. The model of a coupled transformer is discussed, and the mismatch between measured and simulated coupling value is within 3 %. For a wearable scenario, the coupled transformer is designed to fit the bending degree of the wrist. The designed transformer achieves a best coupling factor of 0.42 with ±15mm displacement tolerance. The wireless data link can support 25 kbps data transfer in ASK modulation, and the system wireless power transfer link achieves a 40% efficiency in the optimized position, which fits the application requirement.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 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":"123709404","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/WPTC45513.2019.9055568
J. Hora, Xi Zhu, E. Dutkiewicz
This paper presents a modified design of CMOS differential voltage multiplier circuit block for energy harvesting circuit for wireless sensor networks (WSN) application. The design simulation and layout was carried out using 65nm CMOS process. The extraction of high DC voltage from rectifier block is always a severe bottleneck for energy harvesting. In this work, a simple mechanism to eliminate (Vth) of the MOS transistor by adding an auxiliary PMOS transistor is proposed. Also, an additional two capacitor (Cs) is split and connected to the differential output. Moreover, the conventional and modified voltage multiplier was simulated and implemented with three stages with a load capacitance of 100pF. The simulation result shows that the modified voltage multiplier obtain a higher voltage conversion ratio (Gv) of 3.96, while the conventional voltage multiplier only obtained a Gv of 2.96. Accordingly, the proposed modified rectifier circuit achieved a peak efficiency of 22.41 % and can able to operate a device with a power requirement of 1.2V to 1.8V and with a continuous output current of 3mA.
{"title":"Design of High Voltage Output for CMOS Voltage Rectifier for Energy Harvesting Design","authors":"J. Hora, Xi Zhu, E. Dutkiewicz","doi":"10.1109/WPTC45513.2019.9055568","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055568","url":null,"abstract":"This paper presents a modified design of CMOS differential voltage multiplier circuit block for energy harvesting circuit for wireless sensor networks (WSN) application. The design simulation and layout was carried out using 65nm CMOS process. The extraction of high DC voltage from rectifier block is always a severe bottleneck for energy harvesting. In this work, a simple mechanism to eliminate (Vth) of the MOS transistor by adding an auxiliary PMOS transistor is proposed. Also, an additional two capacitor (Cs) is split and connected to the differential output. Moreover, the conventional and modified voltage multiplier was simulated and implemented with three stages with a load capacitance of 100pF. The simulation result shows that the modified voltage multiplier obtain a higher voltage conversion ratio (Gv) of 3.96, while the conventional voltage multiplier only obtained a Gv of 2.96. Accordingly, the proposed modified rectifier circuit achieved a peak efficiency of 22.41 % and can able to operate a device with a power requirement of 1.2V to 1.8V and with a continuous output current of 3mA.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"168 1 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":"124794121","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/WPTC45513.2019.9055696
Chen Xu, Y. Zhuang, Anqi Chen, Yi Huang, Jiafeng Zhou
This paper presents a wireless power transfer (WPT) system with an extensible charging area. The proposed system uses a vertical receiver with an 8-shape transmitter. Conventionally, circular coil structures suffer from coupling condition variation when used for dynamic wireless charging applications. In this paper, an 8-shape feeding loop is proposed to construct a directional magnetic field for an orthogonal receiver to receive power efficiently. Furthermore, the transmitter can be extended easily by cascading the transmitter modules. Experimental results have demonstrated a power transfer efficiency of 59% - 70 % when a receiver is moving along a 3-module transmitter array. The proposed structure can be a very good candidate for dynamic WPT applications, especially the charging of moving electric vehicles.
{"title":"Charging Area Extensible Wireless Power Transfer System with an Orthogonal Structure","authors":"Chen Xu, Y. Zhuang, Anqi Chen, Yi Huang, Jiafeng Zhou","doi":"10.1109/WPTC45513.2019.9055696","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055696","url":null,"abstract":"This paper presents a wireless power transfer (WPT) system with an extensible charging area. The proposed system uses a vertical receiver with an 8-shape transmitter. Conventionally, circular coil structures suffer from coupling condition variation when used for dynamic wireless charging applications. In this paper, an 8-shape feeding loop is proposed to construct a directional magnetic field for an orthogonal receiver to receive power efficiently. Furthermore, the transmitter can be extended easily by cascading the transmitter modules. Experimental results have demonstrated a power transfer efficiency of 59% - 70 % when a receiver is moving along a 3-module transmitter array. The proposed structure can be a very good candidate for dynamic WPT applications, especially the charging of moving electric vehicles.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"138 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":"123251576","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/WPTC45513.2019.9055628
Longlong Zhang, Lei Wang, Haidi Yu, Y. Zong, Yucai Zhang, Xudong Ming, Zhenyu Zhang
Modular spacecraft is an innovative architecture of space system construction, which a cluster of functional modules act as a single spacecraft by means of functional decomposition, physical separation, free flying and wireless connection. This paper proposed a new power system structure based on wireless power transfer for the modular spacecraft with wireless mobile ad hoc network as data control center, and developed energy management control strategy in order to achieve flexible power supply between different module spacecrafts. Finally, simulation results verified the feasibility of the power system.
{"title":"Research on Wireless Power Transfer in Modular Spacecraft","authors":"Longlong Zhang, Lei Wang, Haidi Yu, Y. Zong, Yucai Zhang, Xudong Ming, Zhenyu Zhang","doi":"10.1109/WPTC45513.2019.9055628","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055628","url":null,"abstract":"Modular spacecraft is an innovative architecture of space system construction, which a cluster of functional modules act as a single spacecraft by means of functional decomposition, physical separation, free flying and wireless connection. This paper proposed a new power system structure based on wireless power transfer for the modular spacecraft with wireless mobile ad hoc network as data control center, and developed energy management control strategy in order to achieve flexible power supply between different module spacecrafts. Finally, simulation results verified the feasibility of the power system.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"66 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":"131759355","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/WPTC45513.2019.9055590
M. Merenda, R. Carotenuto, F. D. Della Corte
The conversion efficiency of an RF energy harvester is studied at 868 MHz as a function of temperature on a printed circuit board charge-pump, based on off-the-shelf diodes and capacitors. Extensive experimental measurements are presented in the temperature range from 25°C to 85°C, showing that the harvested power may significantly degrade with T, in particular at the lower incident power regimes. It is shown that the rectifiers quality, and precisely the temperature dependent rectification ratio of silicon Schottky diodes commonly used for this application, has the strongest impact of the harvester performances.
{"title":"Temperature Induced Degradation of RF Energy Harvesters Efficiency: Experiments and Interpretation","authors":"M. Merenda, R. Carotenuto, F. D. Della Corte","doi":"10.1109/WPTC45513.2019.9055590","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055590","url":null,"abstract":"The conversion efficiency of an RF energy harvester is studied at 868 MHz as a function of temperature on a printed circuit board charge-pump, based on off-the-shelf diodes and capacitors. Extensive experimental measurements are presented in the temperature range from 25°C to 85°C, showing that the harvested power may significantly degrade with T, in particular at the lower incident power regimes. It is shown that the rectifiers quality, and precisely the temperature dependent rectification ratio of silicon Schottky diodes commonly used for this application, has the strongest impact of the harvester performances.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"33 7 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":"127097922","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/WPTC45513.2019.9055532
M. Bisschop, W. Serdijn
This paper presents a method to increase the power conversion of ultrasonic receivers in implantable medical devices. A perfect complex conjugate match between the piezo-electric receiver and the power conversion circuit is required for maximum power transfer. A boost converter in front of the rectifier enables a close to perfect resistive match. The boost converter transforms the AC voltage into a pulse width modulated square wave voltage. This saves an extra impedance transformation between the receiver and the rectifier. From circuit simulation results, it follows that this new method has the highest efficiency compared with prior art.
{"title":"Resistive Matching using an AC Boost Converter for Efficient Ultrasonic Wireless Power Transfer","authors":"M. Bisschop, W. Serdijn","doi":"10.1109/WPTC45513.2019.9055532","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055532","url":null,"abstract":"This paper presents a method to increase the power conversion of ultrasonic receivers in implantable medical devices. A perfect complex conjugate match between the piezo-electric receiver and the power conversion circuit is required for maximum power transfer. A boost converter in front of the rectifier enables a close to perfect resistive match. The boost converter transforms the AC voltage into a pulse width modulated square wave voltage. This saves an extra impedance transformation between the receiver and the rectifier. From circuit simulation results, it follows that this new method has the highest efficiency compared with prior art.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"21 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":"130712128","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/WPTC45513.2019.9055514
Yuki Tanaka, K. Kanai, Ryosuke Hasaba, Hiroshi Sato, Y. Koyanagi, Takuma Ikeda, Hiroyuki Tani, S. Kajiwara, N. Shinohara
In a system that feeds relatively small electric power using microwaves, it is a problem to improve received power in various arrival directions in a power receiving device that is generally small. In this paper, we propose a rectenna that converts power in a wide range of incoming direction to DC with an array antenna that performs power synthesis by a hybrid circuit and report the results of verification by simulation and actual measurement.
{"title":"A Study of Improve Efficiency of Broad-Angle Rectenna Using Hybrid Coupler","authors":"Yuki Tanaka, K. Kanai, Ryosuke Hasaba, Hiroshi Sato, Y. Koyanagi, Takuma Ikeda, Hiroyuki Tani, S. Kajiwara, N. Shinohara","doi":"10.1109/WPTC45513.2019.9055514","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055514","url":null,"abstract":"In a system that feeds relatively small electric power using microwaves, it is a problem to improve received power in various arrival directions in a power receiving device that is generally small. In this paper, we propose a rectenna that converts power in a wide range of incoming direction to DC with an array antenna that performs power synthesis by a hybrid circuit and report the results of verification by simulation and actual measurement.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"180 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":"133180471","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/WPTC45513.2019.9055526
Weikun Cai, Houjun Tang, D. Ma, Xin Liu
For single transmitter single receiver high-power wireless power transfer system, the coils suffer from high voltage stress and current stress. As the power requirement improves for application, the coil becomes the bottlenecks of the power improving. To solve the problem of improving the system power level, this research adopts the parallel circuits to reduce the voltage and current stress of coils as well as to improve the power level. And for multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT) system, the current distribution is a problem need to be solved. In this study, a control strategy is developed to provides high system efficiency and constant output voltage, and balances the currents distribution in MTMRWPT system.
{"title":"Voltage Control and Current Distribution for Multiple-Coil Wireless Power Transfer System","authors":"Weikun Cai, Houjun Tang, D. Ma, Xin Liu","doi":"10.1109/WPTC45513.2019.9055526","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055526","url":null,"abstract":"For single transmitter single receiver high-power wireless power transfer system, the coils suffer from high voltage stress and current stress. As the power requirement improves for application, the coil becomes the bottlenecks of the power improving. To solve the problem of improving the system power level, this research adopts the parallel circuits to reduce the voltage and current stress of coils as well as to improve the power level. And for multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT) system, the current distribution is a problem need to be solved. In this study, a control strategy is developed to provides high system efficiency and constant output voltage, and balances the currents distribution in MTMRWPT system.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"18 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":"133630828","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/WPTC45513.2019.9055547
Erik Andersen, B. Truong, S. Roundy
This paper presents an investigation on the design of a transmit coil for a wireless power transfer system. The transmitter is optimized subject to an imposed safety limit for magnetic field exposure. Three cases are considered as follows: unconstrained, geometrically constrained and current constrained. Equations for determining design parameters for an optimal solenoid wireless power transmitter are found given either system size or current constraints. If a certain magnetic field strength is required, equations for the size and current of the transmitter are found that will allow the necessary fields without violating the safety constraint.
{"title":"Optimal Coil Design for Wireless Powering of Biomedical Implants Considering Safety Constraints","authors":"Erik Andersen, B. Truong, S. Roundy","doi":"10.1109/WPTC45513.2019.9055547","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055547","url":null,"abstract":"This paper presents an investigation on the design of a transmit coil for a wireless power transfer system. The transmitter is optimized subject to an imposed safety limit for magnetic field exposure. Three cases are considered as follows: unconstrained, geometrically constrained and current constrained. Equations for determining design parameters for an optimal solenoid wireless power transmitter are found given either system size or current constraints. If a certain magnetic field strength is required, equations for the size and current of the transmitter are found that will allow the necessary fields without violating the safety constraint.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"10 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":"132688737","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/WPTC45513.2019.9055572
Hongfei Xia, Huanhuan Wu, Yuhua Cheng, Gaofeng Wang
Capacitively coupled wireless power transfer (CPT) is an alternative technology of inductively coupled wireless power transfer. When a CPT system is driven by a Class-E power amplifier and compensated by a LCL resonant network, a new design procedure is proposed in this paper. Under the premise of achieving the optimal load of the Class-E power amplifier after inserting a LCL resonant network, the procedure can help to find a stable voltage gain relative to the deviation of the operating frequency. The theory analysis is verified by the experiments.
{"title":"A Design Procedure for CPT System with LCL Resonant Network","authors":"Hongfei Xia, Huanhuan Wu, Yuhua Cheng, Gaofeng Wang","doi":"10.1109/WPTC45513.2019.9055572","DOIUrl":"https://doi.org/10.1109/WPTC45513.2019.9055572","url":null,"abstract":"Capacitively coupled wireless power transfer (CPT) is an alternative technology of inductively coupled wireless power transfer. When a CPT system is driven by a Class-E power amplifier and compensated by a LCL resonant network, a new design procedure is proposed in this paper. Under the premise of achieving the optimal load of the Class-E power amplifier after inserting a LCL resonant network, the procedure can help to find a stable voltage gain relative to the deviation of the operating frequency. The theory analysis is verified by the experiments.","PeriodicalId":148719,"journal":{"name":"2019 IEEE Wireless Power Transfer Conference (WPTC)","volume":"89 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":"129329248","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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