Pub Date : 2012-05-10DOI: 10.1109/IMWS.2012.6215820
M. Dionigi, M. Mongiardo
Resonant Wireless Power Transfer (WPT) can be realized by using coils coupled via their magnetic fields; such systems can exchange energy in the mid-range. Information can also be exchanged via Near-Field Magnetic Communications (NFMC), which is currently receiving considerable attention for several possible applications. We present a structure that can be used for realizing both WPT and NFMC; this structure shows separate frequency channels for the simultaneous transmission of power and data. A test system with one band for power exchange and two separate bands for data transmission is designed, simulated, and measured to show the effectiveness of the proposed structure.
{"title":"Multi band resonators for wireless power tranfer and near field magnetic communications","authors":"M. Dionigi, M. Mongiardo","doi":"10.1109/IMWS.2012.6215820","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215820","url":null,"abstract":"Resonant Wireless Power Transfer (WPT) can be realized by using coils coupled via their magnetic fields; such systems can exchange energy in the mid-range. Information can also be exchanged via Near-Field Magnetic Communications (NFMC), which is currently receiving considerable attention for several possible applications. We present a structure that can be used for realizing both WPT and NFMC; this structure shows separate frequency channels for the simultaneous transmission of power and data. A test system with one band for power exchange and two separate bands for data transmission is designed, simulated, and measured to show the effectiveness of the proposed structure.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"3 1","pages":"61-64"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85151086","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215814
Y. Suzuki, T. Sugiura, N. Sakai, M. Hanazawa, T. Ohira
This paper demonstrates the feasibility of the wireless power transfer using dielectric coupling between a steel belt in a tire and a metal plate in a roadway. The scheme is called Tire Dielectric Coupling. We designed and prototyped the feeding subsystem using 1/32 scale models. The feeding subsystem is constructed of metal plates, tires and steel belts. We measured S-parameter of the feeding subsystem. As results, S11 is -0.06 dB and S21 is -30.3 dB. With the S-parameter, we built an equivalent circuit model of the feeding subsystem at a wide frequency range in VHF band. We designed and prototyped impedance matching circuits based on an equivalent circuit technique. After tuning, measured S21 of the feeding subsystem with the impedance matching circuits achieved -1.2 dB. This result is as high efficiency as charge/discharge efficiency of lithium-ion battery.
{"title":"Dielectric coupling from electrified roadway to steel-belt tires characterized for miniature model car running demonstration","authors":"Y. Suzuki, T. Sugiura, N. Sakai, M. Hanazawa, T. Ohira","doi":"10.1109/IMWS.2012.6215814","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215814","url":null,"abstract":"This paper demonstrates the feasibility of the wireless power transfer using dielectric coupling between a steel belt in a tire and a metal plate in a roadway. The scheme is called Tire Dielectric Coupling. We designed and prototyped the feeding subsystem using 1/32 scale models. The feeding subsystem is constructed of metal plates, tires and steel belts. We measured S-parameter of the feeding subsystem. As results, S11 is -0.06 dB and S21 is -30.3 dB. With the S-parameter, we built an equivalent circuit model of the feeding subsystem at a wide frequency range in VHF band. We designed and prototyped impedance matching circuits based on an equivalent circuit technique. After tuning, measured S21 of the feeding subsystem with the impedance matching circuits achieved -1.2 dB. This result is as high efficiency as charge/discharge efficiency of lithium-ion battery.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"115 1","pages":"35-38"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78669650","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215776
K. Hatano, N. Shinohara, T. Mitani, T. Seki, M. Kawashima
We improved class-F load rectennas at 24GHz which optimal load and optimal input power were different from the designed ones. We focused on the class-F load which is the most important point in class-F load rectennas. Through analysis of electromagnetic field, we clarified that we could simulate accurately with a circuit analysis simulator when the discontinuity in a microstrip line was small and the thickness of the substrate was thin enough to suppress the effect of the surface wave. We also found that 3rd harmonics management was enough for class-F load rectennas to produce high efficiency. We designed and fabricated the new-type class-F load rectennas. We could not improve the efficiency, but we revealed that the disagreement of the optimal load and the optimal input power was not caused by the effect of the surface wave.
{"title":"Development of improved 24GHz-band class-F load rectennas","authors":"K. Hatano, N. Shinohara, T. Mitani, T. Seki, M. Kawashima","doi":"10.1109/IMWS.2012.6215776","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215776","url":null,"abstract":"We improved class-F load rectennas at 24GHz which optimal load and optimal input power were different from the designed ones. We focused on the class-F load which is the most important point in class-F load rectennas. Through analysis of electromagnetic field, we clarified that we could simulate accurately with a circuit analysis simulator when the discontinuity in a microstrip line was small and the thickness of the substrate was thin enough to suppress the effect of the surface wave. We also found that 3rd harmonics management was enough for class-F load rectennas to produce high efficiency. We designed and fabricated the new-type class-F load rectennas. We could not improve the efficiency, but we revealed that the disagreement of the optimal load and the optimal input power was not caused by the effect of the surface wave.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"21 1","pages":"163-166"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73842211","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215779
Y. Ota, T. Takura, F. Sato, H. Matsuki
There are currently various proposals for method of wireless power transmission. Electromagnetic induction method has been known as a relatively efficient transmission method for a wide variety of application. Here we report the results of recent investigations about the “LC booster method,” a new electromagnetic induction-based system. This method make it possible to using Hi-Q Coil and load-matching, and enables power transmission in bands of several hundred kilohertz under low coupling condition.
{"title":"Wireless power transfer by low coupling electromagnetic induction — LC booster","authors":"Y. Ota, T. Takura, F. Sato, H. Matsuki","doi":"10.1109/IMWS.2012.6215779","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215779","url":null,"abstract":"There are currently various proposals for method of wireless power transmission. Electromagnetic induction method has been known as a relatively efficient transmission method for a wide variety of application. Here we report the results of recent investigations about the “LC booster method,” a new electromagnetic induction-based system. This method make it possible to using Hi-Q Coil and load-matching, and enables power transmission in bands of several hundred kilohertz under low coupling condition.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"71 1","pages":"175-178"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85808618","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215778
J. Guo, Haocheng Hong, Xinen Zhu
This paper presents an adaptive microwave rectifier at 2.45 GHz with automatic load control to improve the conversion efficiency. The conversion efficiency of a rectifier usually changes as the input power level changes, mainly due to the diode efficiency loss associated with built-in voltage or breakdown effect. Therefore, the conversion efficiency can achieve an optimal value only at a specific input power level, and decreases when the input power deviates from this value. The proposed microwave rectifier can automatically tune the load to the optimal value at each input power to maintain a high conversion efficiency within a wide range of input power. An automatic control circuit uses a micro controller unit (MCU) to select various load resistors. By sensing the rectified DC voltage and the current load resistance, the MCU can automatically tune the load to the desired value based on a pre-loaded lookup table. When the input power changes from 5 to 70 mW, the rectifier can achieve optimal conversion efficiencies over 62.5% through automatic tuning the load from 800 to 250 Ω.
{"title":"Automatic load control for highly efficient microwave rectifiers","authors":"J. Guo, Haocheng Hong, Xinen Zhu","doi":"10.1109/IMWS.2012.6215778","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215778","url":null,"abstract":"This paper presents an adaptive microwave rectifier at 2.45 GHz with automatic load control to improve the conversion efficiency. The conversion efficiency of a rectifier usually changes as the input power level changes, mainly due to the diode efficiency loss associated with built-in voltage or breakdown effect. Therefore, the conversion efficiency can achieve an optimal value only at a specific input power level, and decreases when the input power deviates from this value. The proposed microwave rectifier can automatically tune the load to the optimal value at each input power to maintain a high conversion efficiency within a wide range of input power. An automatic control circuit uses a micro controller unit (MCU) to select various load resistors. By sensing the rectified DC voltage and the current load resistance, the MCU can automatically tune the load to the desired value based on a pre-loaded lookup table. When the input power changes from 5 to 70 mW, the rectifier can achieve optimal conversion efficiencies over 62.5% through automatic tuning the load from 800 to 250 Ω.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"51 1","pages":"171-174"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83515752","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215782
Hee-Jin Lee, J. Bang, C. Chung
Wireless power transfer technology via electromagnetic resonant coupling shows the probability of removing wires. Many researches have been published and have shown promising results. However, there were few efforts to lower resonance frequency. A low operating frequency in a system is a very important parameter because the lower operating frequency could reduce a system price. We lowered a self-resonant frequency until 500KHz by using a toroidal ferrite core and measured transmission parameter by a vector network analyzer. We achieved a transmission parameter of over 0.5 in a range of antenna diameter and improved the efficiency in the short range with rotating antenna angle.
{"title":"Electromagnetically coupled resonators using toroidal ferrite core for wireless power transfer","authors":"Hee-Jin Lee, J. Bang, C. Chung","doi":"10.1109/IMWS.2012.6215782","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215782","url":null,"abstract":"Wireless power transfer technology via electromagnetic resonant coupling shows the probability of removing wires. Many researches have been published and have shown promising results. However, there were few efforts to lower resonance frequency. A low operating frequency in a system is a very important parameter because the lower operating frequency could reduce a system price. We lowered a self-resonant frequency until 500KHz by using a toroidal ferrite core and measured transmission parameter by a vector network analyzer. We achieved a transmission parameter of over 0.5 in a range of antenna diameter and improved the efficiency in the short range with rotating antenna angle.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"11 1","pages":"183-186"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80891843","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215792
N. Oodachi, K. Ogawa, S. Obayashi, H. Shoki
A wireless power transfer system using both a resonant coil and a loop element has been reported. In this report, both a transmitter and a receiver are composed of a resonant coil and a loop element. In another report, only a loop element is employed for a receiver, and the configuration of the receiver is simplified. If there is a mutual coupling between the resonant coil and a surrounding object, a resonant frequency of the resonant coil is shifted. In particular, when a material of the surrounding object is a metal, the resonant frequency of the resonant coil is shifted significantly. When a frequency of the transmitter is restricted in narrowband, the transfer efficiency of the system becomes small. For example, when the transmitter of a wireless power transfer system for a mobile terminal is put on a steel desk, the transfer efficiency of the system becomes small. In this paper, a wireless power transfer system is proposed to minimize the influence of the desk. A transmitter of the proposed system is put on the desk. A receiver of the proposed system is put on the transmitter. Exploiting its thinness, a receiver of the proposed system is installed in a mobile terminal. The effectiveness of the proposed system is confirmed by the measurement data.
{"title":"Wireless power transfer system minimizing an influence of a desk","authors":"N. Oodachi, K. Ogawa, S. Obayashi, H. Shoki","doi":"10.1109/IMWS.2012.6215792","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215792","url":null,"abstract":"A wireless power transfer system using both a resonant coil and a loop element has been reported. In this report, both a transmitter and a receiver are composed of a resonant coil and a loop element. In another report, only a loop element is employed for a receiver, and the configuration of the receiver is simplified. If there is a mutual coupling between the resonant coil and a surrounding object, a resonant frequency of the resonant coil is shifted. In particular, when a material of the surrounding object is a metal, the resonant frequency of the resonant coil is shifted significantly. When a frequency of the transmitter is restricted in narrowband, the transfer efficiency of the system becomes small. For example, when the transmitter of a wireless power transfer system for a mobile terminal is put on a steel desk, the transfer efficiency of the system becomes small. In this paper, a wireless power transfer system is proposed to minimize the influence of the desk. A transmitter of the proposed system is put on the desk. A receiver of the proposed system is put on the transmitter. Exploiting its thinness, a receiver of the proposed system is installed in a mobile terminal. The effectiveness of the proposed system is confirmed by the measurement data.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"1 1","pages":"139-141"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83268386","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215772
Sunkyu Kong, J. J. Kim, Joungho Kim
Wireless power transfer (WPT) using magnetic resonance could provide much convenience and so there has been much commercial interests on WPT recently. In the near future, WPT technology is expected to be applied to various electronic devices with transceiver coils for WPT. The coils in different electronic devices for WPT, then, could cause interference on each other. These environments could make a resonance peak for maximum power to divide into several peaks, and have an effect on transferred power and electromagnetic interference (EMI). Therefore, it is needed to measure and analyze various cases for different number of coils in WPT systems. In this paper, we have measured a resonance in vertical multi-coupled coils in the case of tight magnetic coupling. And we have analyzed the transferred power with respect to resonances of vertical multi-coupled coils. We also have measured EMI in vertical multi-coupled coils and analyzed EMI in frequency domain with respect to resonances of vertical multi-coupled coils for WPT systems.
{"title":"Resonance and EMI in vertical multi-coupled coils for wireless power transfer (WPT) system","authors":"Sunkyu Kong, J. J. Kim, Joungho Kim","doi":"10.1109/IMWS.2012.6215772","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215772","url":null,"abstract":"Wireless power transfer (WPT) using magnetic resonance could provide much convenience and so there has been much commercial interests on WPT recently. In the near future, WPT technology is expected to be applied to various electronic devices with transceiver coils for WPT. The coils in different electronic devices for WPT, then, could cause interference on each other. These environments could make a resonance peak for maximum power to divide into several peaks, and have an effect on transferred power and electromagnetic interference (EMI). Therefore, it is needed to measure and analyze various cases for different number of coils in WPT systems. In this paper, we have measured a resonance in vertical multi-coupled coils in the case of tight magnetic coupling. And we have analyzed the transferred power with respect to resonances of vertical multi-coupled coils. We also have measured EMI in vertical multi-coupled coils and analyzed EMI in frequency domain with respect to resonances of vertical multi-coupled coils for WPT systems.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"295 1","pages":"147-150"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76465338","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215784
K. Tanaka, M. Kenichiro, M. Takahashi, T. Ishii, S. Sasaki
We are developing a bread board model for a microwave wireless power transmission (WPT) from a satellite in orbit to the ground. WPT using microwaves is one of the critical and important technologies toward a solar power satellite (SPS). We have carried out a conceptual design and proposed a space experiment using a scientific small satellite which has been developing by JAXA. The purposes of the space experiments are to demonstrate a precise directional control of WPT technology for SPS, which includes the direct detection of rectenna sites, and the microwave beam control skill with high angular precision, and to clarify the propagation characteristics of the microwave power in the ionosphere. Performances of the breadboard were measured and evaluated. Thermal transient characteristics of the breadboard model were simulated.
{"title":"Development of bread board model for microwave power transmission experiment from space to ground using small scientific satellite","authors":"K. Tanaka, M. Kenichiro, M. Takahashi, T. Ishii, S. Sasaki","doi":"10.1109/IMWS.2012.6215784","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215784","url":null,"abstract":"We are developing a bread board model for a microwave wireless power transmission (WPT) from a satellite in orbit to the ground. WPT using microwaves is one of the critical and important technologies toward a solar power satellite (SPS). We have carried out a conceptual design and proposed a space experiment using a scientific small satellite which has been developing by JAXA. The purposes of the space experiments are to demonstrate a precise directional control of WPT technology for SPS, which includes the direct detection of rectenna sites, and the microwave beam control skill with high angular precision, and to clarify the propagation characteristics of the microwave power in the ionosphere. Performances of the breadboard were measured and evaluated. Thermal transient characteristics of the breadboard model were simulated.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"181 1","pages":"191-194"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75519144","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 : 2012-05-10DOI: 10.1109/IMWS.2012.6215803
F. Mastri, A. Costanzo, M. Dionigi, M. Mongiardo
Harmonic-balance (HB) based nonlinear techniques are exploited for the design of a high-efficiency and medium-power switching mode oscillator, used as continuous power source in a wireless power transmission system. The oscillator power is transmitted through resonant coils over variable distances. To account for the resonant frequency variations, which also tune oscillation frequency, a broadband design of the system is carried out with the oscillator load including the resonant coupling and the rectifier. The oscillator efficiency, the RF-to-DC system efficiency and the DC power are then directly optimized for any coupling distance of interest. A Royer-type oscillator is designed and prototyped using the proposed technique. The oscillator exhibits 40 W at 223 kHz with 75% conversion efficiency while the WPT system efficiency, DC-to-DC, is better than 60% for coupling distances of the order of 10 cm.
{"title":"Harmonic balance design of wireless resonant-type power transfer links","authors":"F. Mastri, A. Costanzo, M. Dionigi, M. Mongiardo","doi":"10.1109/IMWS.2012.6215803","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215803","url":null,"abstract":"Harmonic-balance (HB) based nonlinear techniques are exploited for the design of a high-efficiency and medium-power switching mode oscillator, used as continuous power source in a wireless power transmission system. The oscillator power is transmitted through resonant coils over variable distances. To account for the resonant frequency variations, which also tune oscillation frequency, a broadband design of the system is carried out with the oscillator load including the resonant coupling and the rectifier. The oscillator efficiency, the RF-to-DC system efficiency and the DC power are then directly optimized for any coupling distance of interest. A Royer-type oscillator is designed and prototyped using the proposed technique. The oscillator exhibits 40 W at 223 kHz with 75% conversion efficiency while the WPT system efficiency, DC-to-DC, is better than 60% for coupling distances of the order of 10 cm.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"1173 1","pages":"245-248"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72708811","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：