Pub Date : 2021-06-01DOI: 10.1109/WPTC51349.2021.9457904
Sen Bing, Khengdauliu Chawang, J. Chiao
A tuning element is utilized in a planar inductive resonant coupler to improve resonance for monolithic subcutaneous implants. The concept is to enhance the impedance matching for the implant chip at the desired operating frequencies under the practical constraints for subcutaneous implants, such as the requirements within the regulated frequency bands, the limited thickness of overall package, uncertainty of surrounding tissues in individual’s implant site, and inability of antenna tuning after implantation. Two designs are demonstrated with planar ring antennas, targeting the two industrial, scientific and medical (ISM) bands at 903 MHz and 2.45 GHz, with improved reflection coefficients for the implant circuitry. The effects of implantation depths and tissue permittivities are investigated. Measurements with hydrated pork compared with theory utilizing documented human skin tissue permittivities find discrepancies. Experiments and simulations are conducted to explain the discrepancies and validate the designs for human uses. The proposed planar resonant wireless power and signal coupler shows good performance and promise for small subcutaneous implant applications.
{"title":"Resonant Coupler Designs for Subcutaneous Implants","authors":"Sen Bing, Khengdauliu Chawang, J. Chiao","doi":"10.1109/WPTC51349.2021.9457904","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457904","url":null,"abstract":"A tuning element is utilized in a planar inductive resonant coupler to improve resonance for monolithic subcutaneous implants. The concept is to enhance the impedance matching for the implant chip at the desired operating frequencies under the practical constraints for subcutaneous implants, such as the requirements within the regulated frequency bands, the limited thickness of overall package, uncertainty of surrounding tissues in individual’s implant site, and inability of antenna tuning after implantation. Two designs are demonstrated with planar ring antennas, targeting the two industrial, scientific and medical (ISM) bands at 903 MHz and 2.45 GHz, with improved reflection coefficients for the implant circuitry. The effects of implantation depths and tissue permittivities are investigated. Measurements with hydrated pork compared with theory utilizing documented human skin tissue permittivities find discrepancies. Experiments and simulations are conducted to explain the discrepancies and validate the designs for human uses. The proposed planar resonant wireless power and signal coupler shows good performance and promise for small subcutaneous implant applications.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130119359","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458226
F. Benassi, W. Fuscaldo, D. Masotti, A. Galli, A. Costanzo
This work presents the theoretical and numerical design of a novel radiative near-field wireless power transfer (WPT) system at millimeter waves (mm-waves), based on one TX and one RX resonant Bessel-beam launcher, with the aim of providing superior performance in terms of energy focusing capabilities. To evaluate the achievable rectified power, for several TX-RX distances, the wireless link is accurately and efficiently accounted for, by combining the EM analysis of the launchers with EM theory. A single-diode rectifier is designed to operate at 37.5 GHz: for a received power of 0dBm the expected rectifier efficiency exceeds 30%. Radiative near-field wireless power transfer (WPT) promises several benefits over both nonradiative near-field and radiative far-field wireless links. The compact size of the proposed system makes it particularly attractive for future mm-wave wearable WPT systems.
{"title":"Wireless Power Transfer in the Radiative Near-field Through Resonant Bessel-Beam Launchers at Millimeter Waves","authors":"F. Benassi, W. Fuscaldo, D. Masotti, A. Galli, A. Costanzo","doi":"10.1109/WPTC51349.2021.9458226","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458226","url":null,"abstract":"This work presents the theoretical and numerical design of a novel radiative near-field wireless power transfer (WPT) system at millimeter waves (mm-waves), based on one TX and one RX resonant Bessel-beam launcher, with the aim of providing superior performance in terms of energy focusing capabilities. To evaluate the achievable rectified power, for several TX-RX distances, the wireless link is accurately and efficiently accounted for, by combining the EM analysis of the launchers with EM theory. A single-diode rectifier is designed to operate at 37.5 GHz: for a received power of 0dBm the expected rectifier efficiency exceeds 30%. Radiative near-field wireless power transfer (WPT) promises several benefits over both nonradiative near-field and radiative far-field wireless links. The compact size of the proposed system makes it particularly attractive for future mm-wave wearable WPT systems.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"38 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114096552","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458208
E. Fazzini, A. Costanzo, D. Masotti
In this contribution an effective solution for the exploitation of frequency diverse arrays (FDAs) for a precise transfer of power is proposed. The time-dependent radiation mechanism is controlled by a periodic pulse sequence at the radiating elements port. In this way, one can easily select the distance where the power has to be sent, thanks to the direct relationship established between the distance and the time window position within one period. The effectiveness of the time-based architecture is numerically demonstrated through a multi-finger planar array operating at millimeter-wave. Preliminary measured results in the microwave range confirm the FDA unique capability of controlling the range-dependent behavior if pulsed excitations are adopted.
{"title":"Range Selective Power Focusing with Time-controlled Bi-dimensional Frequency Diverse Arrays","authors":"E. Fazzini, A. Costanzo, D. Masotti","doi":"10.1109/WPTC51349.2021.9458208","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458208","url":null,"abstract":"In this contribution an effective solution for the exploitation of frequency diverse arrays (FDAs) for a precise transfer of power is proposed. The time-dependent radiation mechanism is controlled by a periodic pulse sequence at the radiating elements port. In this way, one can easily select the distance where the power has to be sent, thanks to the direct relationship established between the distance and the time window position within one period. The effectiveness of the time-based architecture is numerically demonstrated through a multi-finger planar array operating at millimeter-wave. Preliminary measured results in the microwave range confirm the FDA unique capability of controlling the range-dependent behavior if pulsed excitations are adopted.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114149582","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9457907
Arpan Laha, P. Jain
This paper presents a time domain analysis of a Wireless Power Transfer (WPT) system having one transmitter and one receiver in which constant output voltage is maintained by a buck-boost converter placed after the rectifier on the receiver side. The practical modes of operation of the resonant tank are identified, and exact solutions have been derived for the circuit parameters like gain, currents, and voltages in the tank. This helps in preventing overdesign of components from approximate solutions provided by frequency domain modelling. The system is operated in the strongly coupled region below resonant frequency to achieve zero voltage switching (ZVS), by choosing the appropriate duty ratio of the buck-boost converter, which has not been done in existing literature. Experimental results on a $5mathrm{W}, 5mathrm{V}$ prototype are used to verify the analysis.
{"title":"Time Domain Modelling of a Wireless Power Transfer System using a Buck-Boost Converter for Voltage Regulation","authors":"Arpan Laha, P. Jain","doi":"10.1109/WPTC51349.2021.9457907","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457907","url":null,"abstract":"This paper presents a time domain analysis of a Wireless Power Transfer (WPT) system having one transmitter and one receiver in which constant output voltage is maintained by a buck-boost converter placed after the rectifier on the receiver side. The practical modes of operation of the resonant tank are identified, and exact solutions have been derived for the circuit parameters like gain, currents, and voltages in the tank. This helps in preventing overdesign of components from approximate solutions provided by frequency domain modelling. The system is operated in the strongly coupled region below resonant frequency to achieve zero voltage switching (ZVS), by choosing the appropriate duty ratio of the buck-boost converter, which has not been done in existing literature. Experimental results on a $5mathrm{W}, 5mathrm{V}$ prototype are used to verify the analysis.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125879598","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458061
Yufei Zhao, Yuwei Du, Zhenxing Wang, Jianhua Wang, Yingsan Geng
Ultrasonic wireless power transfer (UWPT) is an important branch of wireless power transfer (WPT) technology, which is widely used in closed metal containers for charging and implanted medical devices. But for an underwater UWPT system, there are two main factors that restrict the transmission efficiency. One is the electrical matching, which can be achieved through a resonance compensation circuit. The other is the acoustic matching, it needs to be considered in terms of transducer structure and material, which has not yet formed a complete theoretical system. This paper proposed a design concept and firstly designed the material and structure of a typical ultrasonic transducer according to acoustic transmission matrix. The input impedance and resonant frequency were then calculated based on Mason equivalent circuit model. In order to restrain the radial acoustic radiation of the piezoelectric ceramic, a new iron shell was added to the designed structure and formed a modified transducer. Then, the simulation and experimental verification were carried out. The theoretical efficiency of the modified transducer was 78.2% when the transmission distance was 10cm and the receiving end was connected to a 200 $Omega$ load resistor.
{"title":"Design of Ultrasonic Transducer Structure for Underwater Wireless Power Transfer System","authors":"Yufei Zhao, Yuwei Du, Zhenxing Wang, Jianhua Wang, Yingsan Geng","doi":"10.1109/WPTC51349.2021.9458061","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458061","url":null,"abstract":"Ultrasonic wireless power transfer (UWPT) is an important branch of wireless power transfer (WPT) technology, which is widely used in closed metal containers for charging and implanted medical devices. But for an underwater UWPT system, there are two main factors that restrict the transmission efficiency. One is the electrical matching, which can be achieved through a resonance compensation circuit. The other is the acoustic matching, it needs to be considered in terms of transducer structure and material, which has not yet formed a complete theoretical system. This paper proposed a design concept and firstly designed the material and structure of a typical ultrasonic transducer according to acoustic transmission matrix. The input impedance and resonant frequency were then calculated based on Mason equivalent circuit model. In order to restrain the radial acoustic radiation of the piezoelectric ceramic, a new iron shell was added to the designed structure and formed a modified transducer. Then, the simulation and experimental verification were carried out. The theoretical efficiency of the modified transducer was 78.2% when the transmission distance was 10cm and the receiving end was connected to a 200 $Omega$ load resistor.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126030457","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458159
Fatemeh Mohseni, Paul Marsh, F. Capolino, J. Chiao, H. Cao
This work presents a passive wireless measurement system for potentiometric chemical probes inside a small laboratory tube. An inductively coupled link is utilized with DC-to-frequency signal transduction via load modulation. The wireless power transfer part of the system features advantageous flexibility in coil separation distances and stability in the frequency providing maximum power transfer, as evidenced by the couple-mode theory analysis. We then demonstrate continuous pH sensing through a cap for a 50-ml centrifuge tube. Instrumentation and resultant data are presented, showcasing excellent linearity and tunable outputs. Our approach and system architecture can be used for numerous passive wireless potentiometric sensing applications in both laboratory and industry settings, as well as other wireless sensing systems, with minor circuit modification.
{"title":"Design of a Wireless Power and Data Transfer System for pH Sensing inside a Small Tube","authors":"Fatemeh Mohseni, Paul Marsh, F. Capolino, J. Chiao, H. Cao","doi":"10.1109/WPTC51349.2021.9458159","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458159","url":null,"abstract":"This work presents a passive wireless measurement system for potentiometric chemical probes inside a small laboratory tube. An inductively coupled link is utilized with DC-to-frequency signal transduction via load modulation. The wireless power transfer part of the system features advantageous flexibility in coil separation distances and stability in the frequency providing maximum power transfer, as evidenced by the couple-mode theory analysis. We then demonstrate continuous pH sensing through a cap for a 50-ml centrifuge tube. Instrumentation and resultant data are presented, showcasing excellent linearity and tunable outputs. Our approach and system architecture can be used for numerous passive wireless potentiometric sensing applications in both laboratory and industry settings, as well as other wireless sensing systems, with minor circuit modification.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124357572","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}
This paper proposed EMI reduction method for over-coupled wireless power transfer (WPT) system using seriesnone (SN) topology. The series-none (SN) topology does not has the compensation capacitor for minimizing reactive power of receiver side. The proposed topology has higher input impedance than conventional series-series (SS) topology, resulting in the odd harmonic components of current for SN topology has lower than that of SS topology. In addition, when the over-coupling phenomena occurs, there is not much difference in efficiency of transferring power compared to SS topology. The proposed method is verified through the 3D EM tool and circuit simulation.
{"title":"EMI Reduction Method for Over-Coupled WPT System using Series-None Topology","authors":"Seongho Woo, Yujun Shin, Changmin Lee, Sungryul Huh, Jaewon Rhee, Bumjin Park, Seokhyeon Son, Seungyoung Ahn","doi":"10.1109/WPTC51349.2021.9457960","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457960","url":null,"abstract":"This paper proposed EMI reduction method for over-coupled wireless power transfer (WPT) system using seriesnone (SN) topology. The series-none (SN) topology does not has the compensation capacitor for minimizing reactive power of receiver side. The proposed topology has higher input impedance than conventional series-series (SS) topology, resulting in the odd harmonic components of current for SN topology has lower than that of SS topology. In addition, when the over-coupling phenomena occurs, there is not much difference in efficiency of transferring power compared to SS topology. The proposed method is verified through the 3D EM tool and circuit simulation.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127516086","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}
This paper describes a method to reduce magnetic field leakage from a Wireless Power Transfer (WPT) systems. By using frequency split phenomena, the reactive shield can reduce the magnetic field of the target frequency band with increasing power transfer efficiency. The simulation results of the suggested reactive shielding coil structure are verified with a 50W-WPT system.
{"title":"EMI Reduction Method in Wireless Power Transfer System with Increasing Efficiency using Frequency Split Phenomena","authors":"Changmin Lee, Seongho Woo, Yujun Shin, Jaewon Rhee, Sungryul Huh, Seokhyeon Son, J. Moon, Seongyoung Ahn","doi":"10.1109/WPTC51349.2021.9458013","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458013","url":null,"abstract":"This paper describes a method to reduce magnetic field leakage from a Wireless Power Transfer (WPT) systems. By using frequency split phenomena, the reactive shield can reduce the magnetic field of the target frequency band with increasing power transfer efficiency. The simulation results of the suggested reactive shielding coil structure are verified with a 50W-WPT system.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114255097","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9458035
Hankyu Lee, Seungchul Jung, Yeunhee Huh, Jaechun Lee, Chisung Bae, Sang Joon Kim
Implantable biomedical devices are spotlighted as promising diagnostic and treatment solutions for chronic diseases providing continuous management. In order to expand its applications, wireless charging technology is essential in that it can significantly reduce the system volume without additional surgery for battery replacement for decades. However, current implantable devices require a dedicated wireless charger optimized for a specific device, which is cumbersome in terms of cost and convenience. Here, we propose a highly efficient wireless charging solution for the implantable biomedical devices using a common smartphone without any physical modifications. To achieve high power transfer efficiency, we adopt a relay coil and an impedance matching technique, enhancing the amount of power transferred to a great extent. With these approaches, we have shown that the battery charging power was remarkably increased by ×8.91 at an implant depth of 1cm. All these measurements were achieved with a Samsung Galaxy Note 10 as a wireless power transmitter. Based on our measurement results, it (b) is highly expected to broaden user experience and contribute to the rapid growth of the implantable biomedical device market as well as provide huge potential to fuse the mobile electronics and medical devices.
{"title":"An Implantable Wireless Charger System with ×8.91 Increased Charging Power Using Smartphone and Relay Coil","authors":"Hankyu Lee, Seungchul Jung, Yeunhee Huh, Jaechun Lee, Chisung Bae, Sang Joon Kim","doi":"10.1109/WPTC51349.2021.9458035","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9458035","url":null,"abstract":"Implantable biomedical devices are spotlighted as promising diagnostic and treatment solutions for chronic diseases providing continuous management. In order to expand its applications, wireless charging technology is essential in that it can significantly reduce the system volume without additional surgery for battery replacement for decades. However, current implantable devices require a dedicated wireless charger optimized for a specific device, which is cumbersome in terms of cost and convenience. Here, we propose a highly efficient wireless charging solution for the implantable biomedical devices using a common smartphone without any physical modifications. To achieve high power transfer efficiency, we adopt a relay coil and an impedance matching technique, enhancing the amount of power transferred to a great extent. With these approaches, we have shown that the battery charging power was remarkably increased by ×8.91 at an implant depth of 1cm. All these measurements were achieved with a Samsung Galaxy Note 10 as a wireless power transmitter. Based on our measurement results, it (b) is highly expected to broaden user experience and contribute to the rapid growth of the implantable biomedical device market as well as provide huge potential to fuse the mobile electronics and medical devices.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114548183","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 : 2021-06-01DOI: 10.1109/WPTC51349.2021.9457887
Tim Krigar, M. Pfost
In many industrial applications, wireless power transfer (WPT) systems with small transmitting and receiving coils and compact secondary sides are required. This asks for high switching frequencies to achieve sufficiently large power densities. At the same time, a conversion from higher to lower voltages is often desirable, and thus different transmitting and receiving coils must be used. This work presents an inductive WPT system addressing both challenges. It uses small transmitting and receiving coils with a surface area of only 20 cm2, achieving a power transfer of 500W. The design of the coils allows for a voltage conversion from 400V to 48 V. To simplify the receiving circuit, operation is similar to an LLC converter so that the compensation capacitor on the secondary side can be omitted. First experimental results of a prototype system show a peak efficiency of 92% at 2 MHz while transmitting 400 W.
{"title":"2-MHz Compact Wireless Power Transfer System With Voltage Conversion From 400 V to 48 V","authors":"Tim Krigar, M. Pfost","doi":"10.1109/WPTC51349.2021.9457887","DOIUrl":"https://doi.org/10.1109/WPTC51349.2021.9457887","url":null,"abstract":"In many industrial applications, wireless power transfer (WPT) systems with small transmitting and receiving coils and compact secondary sides are required. This asks for high switching frequencies to achieve sufficiently large power densities. At the same time, a conversion from higher to lower voltages is often desirable, and thus different transmitting and receiving coils must be used. This work presents an inductive WPT system addressing both challenges. It uses small transmitting and receiving coils with a surface area of only 20 cm2, achieving a power transfer of 500W. The design of the coils allows for a voltage conversion from 400V to 48 V. To simplify the receiving circuit, operation is similar to an LLC converter so that the compensation capacitor on the secondary side can be omitted. First experimental results of a prototype system show a peak efficiency of 92% at 2 MHz while transmitting 400 W.","PeriodicalId":130306,"journal":{"name":"2021 IEEE Wireless Power Transfer Conference (WPTC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129412793","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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