Pub Date : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658390
Bogdan Pamfil, Richard Palm, A. Vyas, H. Staaf, C. Rusu, P. D. Folkow
This paper studies optimization solutions for a proof-of-concept design methodology for a fractal-based tree energy harvester with a stress distribution optimized structure. The focus is on obtaining a sufficiently high-power output and a high enough stress in the longitudinal branch direction by using Frequency Response Functions. The design methodology shows that using the MATLAB code with Sensitivity Analysis and Multi-objective Optimization in combination with elitist genetic algorithm enables an optimal design.
{"title":"Multi-Objective Design Optimization of Fractal-based Piezoelectric Energy Harvester","authors":"Bogdan Pamfil, Richard Palm, A. Vyas, H. Staaf, C. Rusu, P. D. Folkow","doi":"10.1109/PowerMEMS54003.2021.9658390","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658390","url":null,"abstract":"This paper studies optimization solutions for a proof-of-concept design methodology for a fractal-based tree energy harvester with a stress distribution optimized structure. The focus is on obtaining a sufficiently high-power output and a high enough stress in the longitudinal branch direction by using Frequency Response Functions. The design methodology shows that using the MATLAB code with Sensitivity Analysis and Multi-objective Optimization in combination with elitist genetic algorithm enables an optimal design.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123050529","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658356
Orpita Saha, Erik Andersen, S. Roundy
Magnetoelectric (ME) wireless power transfer (WPT) is becoming an important topic in the field of biomedical implants. Implantable ME WPT receivers have potential safety, size, and convenience advantages over alternative methods (i.e. inductive, far-field RF, and acoustic). However, for optimal performance, ME devices need some method to apply a DC bias magnetic field. To overcome the DC bias problem, this paper investigates self-biased ME laminates using the magnetization grading approach. We experimentally characterize the voltage and power performance of multi-layer self-biased ME laminates as a function of pre-magnetizing field. We demonstrate devices made of Metglas, Ni, and PZT of 0.05 cm3 in size that can generate ~250 μW from an applied 130 μT AC field with no DC field bias. This size, power, and AC magnetic field combination makes these laminates attractive for powering biomedical implants.
{"title":"Wireless Power Transfer by Self-biased Magnetoelectric Laminate for Biomedical Implants","authors":"Orpita Saha, Erik Andersen, S. Roundy","doi":"10.1109/PowerMEMS54003.2021.9658356","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658356","url":null,"abstract":"Magnetoelectric (ME) wireless power transfer (WPT) is becoming an important topic in the field of biomedical implants. Implantable ME WPT receivers have potential safety, size, and convenience advantages over alternative methods (i.e. inductive, far-field RF, and acoustic). However, for optimal performance, ME devices need some method to apply a DC bias magnetic field. To overcome the DC bias problem, this paper investigates self-biased ME laminates using the magnetization grading approach. We experimentally characterize the voltage and power performance of multi-layer self-biased ME laminates as a function of pre-magnetizing field. We demonstrate devices made of Metglas, Ni, and PZT of 0.05 cm3 in size that can generate ~250 μW from an applied 130 μT AC field with no DC field bias. This size, power, and AC magnetic field combination makes these laminates attractive for powering biomedical implants.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128544796","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658392
Xinge Guo, Fei Wang, Huicong Liu, Chengkuo Lee
In this manuscript, we reported two multi-functional units aiming at providing a promising monitoring platform applied in walking sticks for elderly and motion impaired people. One rotational unit equipped with an electromagnetic generator (EMG) and linear-to-rotary structure is proposed to harvest the ultra-low frequency linear motion of a walking stick and serve as the sustainable power supply for an Internet of Things (IoT) sensing system. And one hybridized unit further integrated with two self-powered triboelectric sensors to extract the motion features of the walking stick is designed to achieve multi-functional monitoring of users with deep learning technology. Promisingly, the walking stick equipped with proposed units shows a great potential of being an intelligent aid for motion-impaired users to help them live a life with adequate autonomy and safety.
{"title":"Multi-Functional Hybridized Units for Self- Sustainable IoT Sensing and Ultra-Low Frequency Energy Harvesting","authors":"Xinge Guo, Fei Wang, Huicong Liu, Chengkuo Lee","doi":"10.1109/PowerMEMS54003.2021.9658392","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658392","url":null,"abstract":"In this manuscript, we reported two multi-functional units aiming at providing a promising monitoring platform applied in walking sticks for elderly and motion impaired people. One rotational unit equipped with an electromagnetic generator (EMG) and linear-to-rotary structure is proposed to harvest the ultra-low frequency linear motion of a walking stick and serve as the sustainable power supply for an Internet of Things (IoT) sensing system. And one hybridized unit further integrated with two self-powered triboelectric sensors to extract the motion features of the walking stick is designed to achieve multi-functional monitoring of users with deep learning technology. Promisingly, the walking stick equipped with proposed units shows a great potential of being an intelligent aid for motion-impaired users to help them live a life with adequate autonomy and safety.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129003817","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658395
A. Y. Pandiyan, M. Kiziroglou, E. Yeatman
In this study, different load matching techniques are analysed to identify the optimum method to deliver power to the receiver for acoustic wireless power transfer systems. Complex impedance matching of the system’s transducers provides an advantage to drive the transmitter off-resonance for cases where there is a resonance mismatch between the transducers due to make, defect or ambient conditions. By studying the effect of impedance matching for different frequencies near the resonance frequency, similar power levels can be achieved for a wider bandwidth of frequencies using complex impedance matching. Thus, increased power can be delivered to the receiver by controlling the frequency of the transmitter, which can be exploited for beam steering along the propagation axis when standing waves are prominent between the transducers. A summary of the power experimentally extracted for the different loading techniques presented in this paper demonstrates a 4 kHz increase in system bandwidth and 140% more power can be delivered by tuning both transducers with complex impedance matching.
{"title":"Complex Impedance Matching for Far-Field Acoustic Wireless Power Transfer","authors":"A. Y. Pandiyan, M. Kiziroglou, E. Yeatman","doi":"10.1109/PowerMEMS54003.2021.9658395","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658395","url":null,"abstract":"In this study, different load matching techniques are analysed to identify the optimum method to deliver power to the receiver for acoustic wireless power transfer systems. Complex impedance matching of the system’s transducers provides an advantage to drive the transmitter off-resonance for cases where there is a resonance mismatch between the transducers due to make, defect or ambient conditions. By studying the effect of impedance matching for different frequencies near the resonance frequency, similar power levels can be achieved for a wider bandwidth of frequencies using complex impedance matching. Thus, increased power can be delivered to the receiver by controlling the frequency of the transmitter, which can be exploited for beam steering along the propagation axis when standing waves are prominent between the transducers. A summary of the power experimentally extracted for the different loading techniques presented in this paper demonstrates a 4 kHz increase in system bandwidth and 140% more power can be delivered by tuning both transducers with complex impedance matching.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131820281","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658358
S. Wright, M. Kiziroglou, E. Yeatman
Limited magnetic flux has been a significant restriction in the applicability of scaled-down inductive energy, sensing and actuating devices. Magnetic flux concentration could potentially address this challenge by offering higher flux density B and thereby higher transduction power density, sensitivity and force in the small scale. In this paper, a study of flux concentration from a flux path perspective is presented. Numerical simulations show that high permeability cylindrical cores can achieve a flux concentration ratio in the scale of their aspect ratio, as they gather flux from their reachable vicinity. Flux guiding structures such as H-shapes can concentrate the flux incident to their surface and guide it through a small cross-section, achieving a higher concentration ratio. In an experimental study, a flux concentration factor of 6 is reported using a single 5 mm diameter, 20 mm high cylinder, and an additional increase factor of 4.3 from the addition of 70 mm × 12 mm × 2 mm flanges. A total B amplification ratio of 26 is demonstrated. As an application demonstrator, this approach is employed in an inductive energy harvester yielding 11.4 mW average power output (0.3 mW/g) from a 0.12 mT RMS, 800 Hz field.
有限的磁通量已经成为缩小感应能量、传感和致动装置适用性的一个重大限制。磁通浓度可以提供更高的磁通密度B，从而在小范围内提供更高的转导功率密度、灵敏度和力，从而潜在地解决这一挑战。本文从通量路径的角度对通量浓度进行了研究。数值模拟结果表明，高渗透率柱状岩心可以在其长径比范围内实现通量集中比，因为它们可以从可到达的附近收集通量。h形导磁结构可以将入射到其表面的通量集中，并引导其通过小截面，从而获得更高的集中比。在一项实验研究中，使用单个直径为5mm、高为20mm的圆柱体时，通量浓度因子为6，而增加70 mm × 12 mm × 2mm法兰时，通量浓度因子增加了4.3。结果表明，总B扩增比为26。作为应用演示，该方法用于感应能量采集器，从0.12 mT RMS, 800 Hz场中产生11.4 mW的平均输出功率(0.3 mW/g)。
{"title":"Magnetic Flux Guidance Using H Structures for Miniature Transducers","authors":"S. Wright, M. Kiziroglou, E. Yeatman","doi":"10.1109/PowerMEMS54003.2021.9658358","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658358","url":null,"abstract":"Limited magnetic flux has been a significant restriction in the applicability of scaled-down inductive energy, sensing and actuating devices. Magnetic flux concentration could potentially address this challenge by offering higher flux density B and thereby higher transduction power density, sensitivity and force in the small scale. In this paper, a study of flux concentration from a flux path perspective is presented. Numerical simulations show that high permeability cylindrical cores can achieve a flux concentration ratio in the scale of their aspect ratio, as they gather flux from their reachable vicinity. Flux guiding structures such as H-shapes can concentrate the flux incident to their surface and guide it through a small cross-section, achieving a higher concentration ratio. In an experimental study, a flux concentration factor of 6 is reported using a single 5 mm diameter, 20 mm high cylinder, and an additional increase factor of 4.3 from the addition of 70 mm × 12 mm × 2 mm flanges. A total B amplification ratio of 26 is demonstrated. As an application demonstrator, this approach is employed in an inductive energy harvester yielding 11.4 mW average power output (0.3 mW/g) from a 0.12 mT RMS, 800 Hz field.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124315973","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658383
T. Avetissian, F. Formosa, Michel Demuynck, Aidin Delnavaz, J. Voix, A. Badel
This paper demonstrates the concept and design of a hydraulic-piezoelectric self-actuated frequency up conversion system for energy harvesting. Two pistons actuate a bistable oscillator associated to a piezoelectric transducer allowing a low frequency hydraulic excitation to be efficiently converted into electric energy. An innovative concept of hydraulic passive valves based on flexible tube buckling is presented.
{"title":"Hydraulic valves design for the operation of an in-ear energy harvesting system","authors":"T. Avetissian, F. Formosa, Michel Demuynck, Aidin Delnavaz, J. Voix, A. Badel","doi":"10.1109/PowerMEMS54003.2021.9658383","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658383","url":null,"abstract":"This paper demonstrates the concept and design of a hydraulic-piezoelectric self-actuated frequency up conversion system for energy harvesting. Two pistons actuate a bistable oscillator associated to a piezoelectric transducer allowing a low frequency hydraulic excitation to be efficiently converted into electric energy. An innovative concept of hydraulic passive valves based on flexible tube buckling is presented.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125051090","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658359
Vishal Gyanchandani, S. N. Masabi, Hailing Fu
Wearable monitors have revolutionized the healthcare industry with help of non-invasive measurement technologies. However, the adoption of these vital monitors faces challenges such as high-power consumption and limited battery lifetime. In this paper, to overcome these challenges, a self-powered wearable monitoring system is designed, integrated, and experimentally validated. The system includes a photovoltaic panel (PV), a DC-DC converter, supercapacitors, a pulse sensor, an accelerometer, a microcontroller unit and a Bluetooth module to extract critical physiological parameters, including heart rate, oxygen saturation, activity of daily living and deliver wireless data access to a mobile device. A theoretical model of the energy balance model was established to realize the balance between the energy harvesting capability and sensing power consumption. In an experimental study, a 50 F supercapacitor stored 430 J in 4 hours (29.9 mW) using a PV energy harvester at 500 W/m2, which allows the sensor system (power consumption 5mW) to run sustainably for 24 h.
{"title":"A Self-Powered Wearable Device using the Photovoltaic Effect for Human Heath Monitoring","authors":"Vishal Gyanchandani, S. N. Masabi, Hailing Fu","doi":"10.1109/PowerMEMS54003.2021.9658359","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658359","url":null,"abstract":"Wearable monitors have revolutionized the healthcare industry with help of non-invasive measurement technologies. However, the adoption of these vital monitors faces challenges such as high-power consumption and limited battery lifetime. In this paper, to overcome these challenges, a self-powered wearable monitoring system is designed, integrated, and experimentally validated. The system includes a photovoltaic panel (PV), a DC-DC converter, supercapacitors, a pulse sensor, an accelerometer, a microcontroller unit and a Bluetooth module to extract critical physiological parameters, including heart rate, oxygen saturation, activity of daily living and deliver wireless data access to a mobile device. A theoretical model of the energy balance model was established to realize the balance between the energy harvesting capability and sensing power consumption. In an experimental study, a 50 F supercapacitor stored 430 J in 4 hours (29.9 mW) using a PV energy harvester at 500 W/m2, which allows the sensor system (power consumption 5mW) to run sustainably for 24 h.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129498390","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658353
N. Sherkat, Swathi Krishna Subhash, Timo Gerach, U. Pelz, P. Woias
This paper discusses and demonstrates the development of fabrication processes for micro-thermoelectric generators based on low-cost fabrication technologies which are suitable for mass production. Simulation studies have been carried out, two fabrication methods are explained and device performance is compared with simulation results. The PCB is used as the main substrate for this device and Bi0.5Sb1.5Te3 (p-type) and Bi2Te2.7Se0.3 (n-type) pastes are used as thermoelectric materials. A square μTEG (15 mm × 15 mm × 500 μm) with 8 thermocouples (TC) is fabricated. A comparison of measurements from an 8-TC-μTEG with simulation results is in good agreement.
{"title":"Development of Manufacturing Processes for Vertical Micro-Thermoelectric Generators based on Printed Circuit Boards","authors":"N. Sherkat, Swathi Krishna Subhash, Timo Gerach, U. Pelz, P. Woias","doi":"10.1109/PowerMEMS54003.2021.9658353","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658353","url":null,"abstract":"This paper discusses and demonstrates the development of fabrication processes for micro-thermoelectric generators based on low-cost fabrication technologies which are suitable for mass production. Simulation studies have been carried out, two fabrication methods are explained and device performance is compared with simulation results. The PCB is used as the main substrate for this device and Bi0.5Sb1.5Te3 (p-type) and Bi2Te2.7Se0.3 (n-type) pastes are used as thermoelectric materials. A square μTEG (15 mm × 15 mm × 500 μm) with 8 thermocouples (TC) is fabricated. A comparison of measurements from an 8-TC-μTEG with simulation results is in good agreement.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125088697","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658367
Mahmoud Wagih, N. Hillier, A. Weddell, S. Beeby
Wearable Radio Frequency (RF) rectennas do not require expensive or hazardous materials and can be easily integrated with conventional e-textiles. In this paper, we investigate the use of ultra-miniaturized wire-type monopole antennas for energy harvesting (EH) applications, as a method maximizing the effective collection area of a rectenna relative to its physical size, while not reducing the net DC output. The rectenna, operating in the 915 MHz band, is integrated with a simple carbon-based e-textile supercapacitor for direct energy conversion and storage. The integrated module is then demonstrated, for the first time, wirelessly-charging a Bluetooth Low Energy sensor node at over 1 m distance from a license-free Powercast transmitter. The 14.1 mF supercapacitor is charged using the e-textile rectenna filament in 83 s up to 4.14 V, from an incident power density of 23.9 μW/cm2 and a time-averaged efficiency over 40%, enabling the sensor node to sustain operation for 108 s after the wireless RF source is stopped. Compared to state-of-the-art RF energy harvesters, the proposed module achieves over five fold improvement in the RF to DC power harvesting efficiency normalized to the harvester’s area.
{"title":"Textile-based Radio Frequency Energy Harvesting and Storage using Ultra-Compact Rectennas with High Effective-to-Physical Area Ratio","authors":"Mahmoud Wagih, N. Hillier, A. Weddell, S. Beeby","doi":"10.1109/PowerMEMS54003.2021.9658367","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658367","url":null,"abstract":"Wearable Radio Frequency (RF) rectennas do not require expensive or hazardous materials and can be easily integrated with conventional e-textiles. In this paper, we investigate the use of ultra-miniaturized wire-type monopole antennas for energy harvesting (EH) applications, as a method maximizing the effective collection area of a rectenna relative to its physical size, while not reducing the net DC output. The rectenna, operating in the 915 MHz band, is integrated with a simple carbon-based e-textile supercapacitor for direct energy conversion and storage. The integrated module is then demonstrated, for the first time, wirelessly-charging a Bluetooth Low Energy sensor node at over 1 m distance from a license-free Powercast transmitter. The 14.1 mF supercapacitor is charged using the e-textile rectenna filament in 83 s up to 4.14 V, from an incident power density of 23.9 μW/cm2 and a time-averaged efficiency over 40%, enabling the sensor node to sustain operation for 108 s after the wireless RF source is stopped. Compared to state-of-the-art RF energy harvesters, the proposed module achieves over five fold improvement in the RF to DC power harvesting efficiency normalized to the harvester’s area.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125642032","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 : 2021-12-06DOI: 10.1109/PowerMEMS54003.2021.9658362
Erik Andersen, Orpita Saha, S. Roundy
Magnetoelectric transducers (ME) wireless power transfer systems (WPTS) offer a way to power small biomedical implants. However, if the ME receiver becomes misaligned the wireless power delivered to the load can be dramatically reduced. A dynamic transmit coil using actuators and physically rotating or moving the transmit coil reduces the misalignment between the transmitter and the receiver. We model the expected power gains a WPTS has using a dynamic transmitter versus a static transmitter (a coil that does not move or rotate). We experimentally show that adding a single servo motor to make a dynamic transmit coil increases the power available to load by a factor of 2.4 over an otherwise identical static transmit coil for a given misaligned ME receiver in a WPTS.
{"title":"A Dynamic Transmit Coil for Wirelessly Powering Small ME Transducer based Biomedical Implants","authors":"Erik Andersen, Orpita Saha, S. Roundy","doi":"10.1109/PowerMEMS54003.2021.9658362","DOIUrl":"https://doi.org/10.1109/PowerMEMS54003.2021.9658362","url":null,"abstract":"Magnetoelectric transducers (ME) wireless power transfer systems (WPTS) offer a way to power small biomedical implants. However, if the ME receiver becomes misaligned the wireless power delivered to the load can be dramatically reduced. A dynamic transmit coil using actuators and physically rotating or moving the transmit coil reduces the misalignment between the transmitter and the receiver. We model the expected power gains a WPTS has using a dynamic transmitter versus a static transmitter (a coil that does not move or rotate). We experimentally show that adding a single servo motor to make a dynamic transmit coil increases the power available to load by a factor of 2.4 over an otherwise identical static transmit coil for a given misaligned ME receiver in a WPTS.","PeriodicalId":165158,"journal":{"name":"2021 IEEE 20th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128030408","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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