Pub Date : 2012-05-10DOI: 10.1109/IMWS.2012.6215773
G. Franceschetti, P. Rocca, F. Robol, A. Massa
The design of an innovative rectenna system, to be used for collection of the energy delivered from space solar power satellites, is presented in this work. The problem is formulated as an optimization one, where the positions of the antenna elements are properly chosen, to maximize the total amount of power received by the rectenna. A number of options are presented, by looking to the problem from the novel wireless power transmission point of view.
{"title":"Innovative rectenna design for space solar power systems","authors":"G. Franceschetti, P. Rocca, F. Robol, A. Massa","doi":"10.1109/IMWS.2012.6215773","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215773","url":null,"abstract":"The design of an innovative rectenna system, to be used for collection of the energy delivered from space solar power satellites, is presented in this work. The problem is formulated as an optimization one, where the positions of the antenna elements are properly chosen, to maximize the total amount of power received by the rectenna. A number of options are presented, by looking to the problem from the novel wireless power transmission point of view.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"35 1","pages":"151-153"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77075465","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.2012.6215777
T. Yagi, H. Shiomi, Y. Okamura
The space solar power system (SSPS) requires a large phased array antenna (PAA) with high efficiency and high accuracy but with the conventional method there arises the problem of loss in splitters and phase shifters. In this research, we use a structure integrates phase-locked loop (PLL) oscillators to each antenna element, in order to achieve the objective of simplifying the antenna and increasing its efficiency the simplification and efficiency of the antenna. To make it work as a PAA, we generate a phase difference between the PLL oscillators by controlling the charge pump (CP) output in the oscillators. In the experiment, synchronous detection is performed by using two PLL oscillators; we confirm that it is possible to control the phase difference to 360°. In addition, the phase difference is found to vary in proportion to the CP output.
{"title":"Phase control experiment of the PLL oscillator for a phased array antenna","authors":"T. Yagi, H. Shiomi, Y. Okamura","doi":"10.1109/IMWS.2012.6215777","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215777","url":null,"abstract":"The space solar power system (SSPS) requires a large phased array antenna (PAA) with high efficiency and high accuracy but with the conventional method there arises the problem of loss in splitters and phase shifters. In this research, we use a structure integrates phase-locked loop (PLL) oscillators to each antenna element, in order to achieve the objective of simplifying the antenna and increasing its efficiency the simplification and efficiency of the antenna. To make it work as a PAA, we generate a phase difference between the PLL oscillators by controlling the charge pump (CP) output in the oscillators. In the experiment, synchronous detection is performed by using two PLL oscillators; we confirm that it is possible to control the phase difference to 360°. In addition, the phase difference is found to vary in proportion to the CP output.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"369 1","pages":"167-170"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84920916","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.2012.6215767
Hyunkeun Lim, K. Ishida, M. Takamiya, T. Sakurai
A magnetically resonant wireless power transmission board (MR-WPTB) on a printed-circuit board is developed. MR-WPTB wirelessly supplies the power to electronic devices such as smartphones anywhere on the board with high efficiency. In order to increase a power transmission efficiency degraded by a misalignment of a receiver coil, a transmitter coil array and a proposed staggered repeater coil array (SRCA) are stacked in MR-WPTB. 1 transmitter coil closest to the receiver coil and the surrounding 4 repeater coils are selectively activated based on the result of a position detection of the receiver coil. By adding SRCA to the transmitter coil array, the measured power transmission efficiency at the worst case misalignment increases from 4.8% to 64% at a distance of 15mm between the transmitter and receiver coils with a diameter of 40mm.
{"title":"Positioning-free magnetically resonant wireless power transmission board with staggered repeater coil array (SRCA)","authors":"Hyunkeun Lim, K. Ishida, M. Takamiya, T. Sakurai","doi":"10.1109/IMWS.2012.6215767","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215767","url":null,"abstract":"A magnetically resonant wireless power transmission board (MR-WPTB) on a printed-circuit board is developed. MR-WPTB wirelessly supplies the power to electronic devices such as smartphones anywhere on the board with high efficiency. In order to increase a power transmission efficiency degraded by a misalignment of a receiver coil, a transmitter coil array and a proposed staggered repeater coil array (SRCA) are stacked in MR-WPTB. 1 transmitter coil closest to the receiver coil and the surrounding 4 repeater coils are selectively activated based on the result of a position detection of the receiver coil. By adding SRCA to the transmitter coil array, the measured power transmission efficiency at the worst case misalignment increases from 4.8% to 64% at a distance of 15mm between the transmitter and receiver coils with a diameter of 40mm.","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":"93-96"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73486636","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.2012.6215807
Y. Endo, Y. Furukawa
In a magnetically coupled resonance system which enables intermediate-range power transmission, over 100 high Q is required in the power transmission resonance circuit. In other words, high-precision adjustment of the resonance frequency is necessary. In this paper, we are proposing a pure-electronic resonance frequency adjustment circuit which does not require any complicated controls. With this proposal, the resonant condition can be maintained without using high-precision parts or mechanical adjustment mechanisms.
{"title":"Proposal for a new resonance adjustment method in magnetically coupled resonance type wireless power transmission","authors":"Y. Endo, Y. Furukawa","doi":"10.1109/IMWS.2012.6215807","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215807","url":null,"abstract":"In a magnetically coupled resonance system which enables intermediate-range power transmission, over 100 high Q is required in the power transmission resonance circuit. In other words, high-precision adjustment of the resonance frequency is necessary. In this paper, we are proposing a pure-electronic resonance frequency adjustment circuit which does not require any complicated controls. With this proposal, the resonant condition can be maintained without using high-precision parts or mechanical adjustment mechanisms.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"160 1","pages":"263-266"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73797800","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.2012.6215806
A. Noda, H. Shinoda
In this paper we demonstrate a high-efficiency dc power extraction using a rectifying coupler in a two-dimensional waveguide power transmission (2DWPT) system. In our recent research, 2DWPT system has been improved in efficiency and electromagnetic compatibility (EMC), by covering the waveguide surface with a thick insulator layer and using a high-quality-factor (high-Q) resonant coupler. The rectifying coupler is a combination of a high-Q waveguide-ring resonator (WRR) coupler and a class-F rectifying circuit. We evaluate the overall efficiency, i.e. the ratio of the dc output of the rectifying coupler to the RF input into the sheet, in a prototype 2DWPT system. A 6.4 × 3.6 cm2 coupler on a 56 × 39 cm2 sheet (nearly 100 times larger area than the coupler) achieved 40.4% efficiency at a maximum, where the RF input was 30.0 dBm in a 2.4-GHz band.
{"title":"Waveguide-ring resonator coupler with class-F rectifier for 2-D waveguide power transmission","authors":"A. Noda, H. Shinoda","doi":"10.1109/IMWS.2012.6215806","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215806","url":null,"abstract":"In this paper we demonstrate a high-efficiency dc power extraction using a rectifying coupler in a two-dimensional waveguide power transmission (2DWPT) system. In our recent research, 2DWPT system has been improved in efficiency and electromagnetic compatibility (EMC), by covering the waveguide surface with a thick insulator layer and using a high-quality-factor (high-Q) resonant coupler. The rectifying coupler is a combination of a high-Q waveguide-ring resonator (WRR) coupler and a class-F rectifying circuit. We evaluate the overall efficiency, i.e. the ratio of the dc output of the rectifying coupler to the RF input into the sheet, in a prototype 2DWPT system. A 6.4 × 3.6 cm2 coupler on a 56 × 39 cm2 sheet (nearly 100 times larger area than the coupler) achieved 40.4% efficiency at a maximum, where the RF input was 30.0 dBm in a 2.4-GHz band.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"19 1","pages":"259-262"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81818096","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.2012.6215801
T. Hosotani, I. Awai
Two coils constitute a coupled-resonator wireless power transfer (WPT) system contributing as a critical part of zero-volt-switching (ZVS) power supply. Coupled resonators are first analyzed by the harmonic resonance analysis (HRA), and the F-parameter resonance analysis (FRA) methods to obtain the input impedance and voltage gain vs. the operating frequency. After that, the total circuit including the switching transistors and rectifying diodes is analyzed by the switching converter analysis tool (SCAT). The estimated voltage gain by the FRA method is well duplicated in the total zero volt switching (ZVS) circuit simulation including the semiconductor devices by SCAT. Thus, the coupled coil resonators analysis is for the first time utilized to analyze the total high-efficiency ZVS WPT system.
{"title":"A novel analysis of ZVS wireless power transfer system using coupled resonators","authors":"T. Hosotani, I. Awai","doi":"10.1109/IMWS.2012.6215801","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215801","url":null,"abstract":"Two coils constitute a coupled-resonator wireless power transfer (WPT) system contributing as a critical part of zero-volt-switching (ZVS) power supply. Coupled resonators are first analyzed by the harmonic resonance analysis (HRA), and the F-parameter resonance analysis (FRA) methods to obtain the input impedance and voltage gain vs. the operating frequency. After that, the total circuit including the switching transistors and rectifying diodes is analyzed by the switching converter analysis tool (SCAT). The estimated voltage gain by the FRA method is well duplicated in the total zero volt switching (ZVS) circuit simulation including the semiconductor devices by SCAT. Thus, the coupled coil resonators analysis is for the first time utilized to analyze the total high-efficiency ZVS WPT system.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"24 1","pages":"235-238"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84773928","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.2012.6215793
S. Hyodo, F. Nishimura, H. Abe, H. Kohara, T. Tsujimoto, A. Yabuta, M. Kawada
Recently wireless power transmission technology attracts attention. A method using magnetic resonant wireless power driven by about 10MHz, examination such as improvement of the transmission efficiency or the extension of the transmission distance is researched. On the other hand, we are interested in possibility of the reduction of the thickness of the antenna coil. In addition, we are studying high efficiency power transmission at short distance to reduce leakage magnetic flux. We investigated the structure parameter of the spiral type coil antenna that the transmission of the high efficiency could be possible in case of short distance. The control possibility of the transmission distance by the adjustment of this structure parameter was derived.
{"title":"Resonance type short distance power transfer property for the structure parameter of the spiral coil","authors":"S. Hyodo, F. Nishimura, H. Abe, H. Kohara, T. Tsujimoto, A. Yabuta, M. Kawada","doi":"10.1109/IMWS.2012.6215793","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215793","url":null,"abstract":"Recently wireless power transmission technology attracts attention. A method using magnetic resonant wireless power driven by about 10MHz, examination such as improvement of the transmission efficiency or the extension of the transmission distance is researched. On the other hand, we are interested in possibility of the reduction of the thickness of the antenna coil. In addition, we are studying high efficiency power transmission at short distance to reduce leakage magnetic flux. We investigated the structure parameter of the spiral type coil antenna that the transmission of the high efficiency could be possible in case of short distance. The control possibility of the transmission distance by the adjustment of this structure parameter was derived.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"4 1","pages":"143-146"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88303060","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.2012.6215825
Hongseok Kim, C. Song, Jonghoon J. Kim, Jiseong Kim, Joungho Kim
In this paper, the shielded coil structure using the ferrites and the metallic shielding is proposed. It is compared with the unshielded coil structure (i.e. a pair of circular loop coils only) to demonstrate the differences in the magnetic field distributions and system performance. The simulation results using the 3D Finite Element Analysis (FEA) tool show that it can considerably suppress the leakage magnetic field from 100W-class wireless power transfer (WPT) system with the enhanced system performance.
{"title":"Shielded coil structure suppressing leakage magnetic field from 100W-class wireless power transfer system with higher efficiency","authors":"Hongseok Kim, C. Song, Jonghoon J. Kim, Jiseong Kim, Joungho Kim","doi":"10.1109/IMWS.2012.6215825","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215825","url":null,"abstract":"In this paper, the shielded coil structure using the ferrites and the metallic shielding is proposed. It is compared with the unshielded coil structure (i.e. a pair of circular loop coils only) to demonstrate the differences in the magnetic field distributions and system performance. The simulation results using the 3D Finite Element Analysis (FEA) tool show that it can considerably suppress the leakage magnetic field from 100W-class wireless power transfer (WPT) system with the enhanced system performance.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"42 1","pages":"83-86"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77311289","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.2012.6215813
A. Nagahama, T. Mitani, N. Shinohara, K. Fukuda, K. Hiraoka, K. Yonemoto
The objective of the present study is to develop a microwave power transmitting system for a Mars observation airplane. A wide-ranging continual Mars observation is becoming important for understanding physical properties of Mars. We suggested a transmitting system with a magnetron-based phased array. In this paper, we conducted auto tracking experiments and confirmed position detection error of the auto tracking system caused declines of received power. We also demonstrated transmitting power control and confirmed that the power control provided approximately uniform DC voltage for a ground experiment airplane.
{"title":"Auto tracking and power control experiments of a magnetron-based phased array power transmitting system for a Mars observation airplane","authors":"A. Nagahama, T. Mitani, N. Shinohara, K. Fukuda, K. Hiraoka, K. Yonemoto","doi":"10.1109/IMWS.2012.6215813","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215813","url":null,"abstract":"The objective of the present study is to develop a microwave power transmitting system for a Mars observation airplane. A wide-ranging continual Mars observation is becoming important for understanding physical properties of Mars. We suggested a transmitting system with a magnetron-based phased array. In this paper, we conducted auto tracking experiments and confirmed position detection error of the auto tracking system caused declines of received power. We also demonstrated transmitting power control and confirmed that the power control provided approximately uniform DC voltage for a ground experiment airplane.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"10 1","pages":"29-32"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82006397","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.2012.6215783
A. Yamada, T. Shijo, S. Obayashi, H. Shoki
We have developed resonant coils for kW-class wireless power transfer systems used in industrial applications such as EV/PHEVs. The characteristics requested for such coils are small size, lightweight and low loss. In this study we have simulated two test coils that have different arrangement of ferrite cores. Both coils have outline size of 50 cm square and thickness of about 3 cm. The proposed core arrangement reduced the core loss by 38% compared with the conventional type.
{"title":"Development of resonant coil for kW-class wireless power transfer system","authors":"A. Yamada, T. Shijo, S. Obayashi, H. Shoki","doi":"10.1109/IMWS.2012.6215783","DOIUrl":"https://doi.org/10.1109/IMWS.2012.6215783","url":null,"abstract":"We have developed resonant coils for kW-class wireless power transfer systems used in industrial applications such as EV/PHEVs. The characteristics requested for such coils are small size, lightweight and low loss. In this study we have simulated two test coils that have different arrangement of ferrite cores. Both coils have outline size of 50 cm square and thickness of about 3 cm. The proposed core arrangement reduced the core loss by 38% compared with the conventional type.","PeriodicalId":6308,"journal":{"name":"2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications","volume":"47 1","pages":"187-189"},"PeriodicalIF":0.0,"publicationDate":"2012-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83686447","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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