Pub Date : 2021-06-01DOI: 10.1109/WoW51332.2021.9462874
Sounak Maji, Sreyam Sinha, Mausamjeet Khatua, K. Afridi
This paper presents a framework to determine the theoretical limits of maximum power that can be delivered by capacitive wireless power transfer (WPT) systems suitable for electric vehicle (EV) charging and their optimal operating frequencies. The limits on system performance imposed by physical constraints such as air breakdown, application-specific constraints such as allowable fringing field levels and constraints imposed by the semiconductor devices such as device thermal limits are studied. The proposed framework is used to predict and compare the maximum power transfer capability of different capacitive WPT systems designed to charge EVs operating at different frequencies and also find the optimal operating frequency as a tradeoff between power, efficiency, and physical size of magnetics. The analytical framework is validated using a 13.56-MHz 12-cm air-gap prototype capacitive WPT system that transfers 1 kW power with a dc-dc efficiency of 86%.
{"title":"Theoretical Limits and Optimal Operating Frequencies of Capacitive Wireless Charging Systems","authors":"Sounak Maji, Sreyam Sinha, Mausamjeet Khatua, K. Afridi","doi":"10.1109/WoW51332.2021.9462874","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462874","url":null,"abstract":"This paper presents a framework to determine the theoretical limits of maximum power that can be delivered by capacitive wireless power transfer (WPT) systems suitable for electric vehicle (EV) charging and their optimal operating frequencies. The limits on system performance imposed by physical constraints such as air breakdown, application-specific constraints such as allowable fringing field levels and constraints imposed by the semiconductor devices such as device thermal limits are studied. The proposed framework is used to predict and compare the maximum power transfer capability of different capacitive WPT systems designed to charge EVs operating at different frequencies and also find the optimal operating frequency as a tradeoff between power, efficiency, and physical size of magnetics. The analytical framework is validated using a 13.56-MHz 12-cm air-gap prototype capacitive WPT system that transfers 1 kW power with a dc-dc efficiency of 86%.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"34 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":"134054133","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/WoW51332.2021.9462857
A. Ridge, Silvia Konaklieva, S. Bradley, Richard A. McMahon, Krishna Kumar
When power electronics are deployed under the road surface as part of a wireless system it is important to know that their packaging provides adequate heat extraction as well as the required environmental protection – often conflicting requirements. Presently very little can be found in wireless charging standards and literature on the topic of thermal modelling for in-ground components. Yet, this is a topic of great practical significance especially for in-road systems. Traditional cooling methods are not readily applicable underground. This paper uses finite element thermal modelling to investigate the cooling of a representative medium-power in-road wireless system, housed in a sealed ground assembly (GA) chamber and installed to UK requirements (HAUC). The paper quantitatively compares design options and provides practical recommendations for in-road installation thermal management.
{"title":"Power Electronics Packaging for In-Road Wireless Charging Installations","authors":"A. Ridge, Silvia Konaklieva, S. Bradley, Richard A. McMahon, Krishna Kumar","doi":"10.1109/WoW51332.2021.9462857","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462857","url":null,"abstract":"When power electronics are deployed under the road surface as part of a wireless system it is important to know that their packaging provides adequate heat extraction as well as the required environmental protection – often conflicting requirements. Presently very little can be found in wireless charging standards and literature on the topic of thermal modelling for in-ground components. Yet, this is a topic of great practical significance especially for in-road systems. Traditional cooling methods are not readily applicable underground. This paper uses finite element thermal modelling to investigate the cooling of a representative medium-power in-road wireless system, housed in a sealed ground assembly (GA) chamber and installed to UK requirements (HAUC). The paper quantitatively compares design options and provides practical recommendations for in-road installation thermal management.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","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":"133310391","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/WoW51332.2021.9462864
Javier Stillig, Alexander Enssle, N. Parspour
In the factory of the future, production lines have to be reconfigured more frequently than today, driven by the volatile market influences. To enable a fast, cost-effective and user-friendly reconfigurability of production equipment, it is essential to break down the complex production machinery into autonomous, mutually compatible functional units that can be positioned anywhere on the shop floor. Enabling the units to be mobile, its power supply must be wireless. This paper introduces a new design of energy transfer modules forming a complete power distribution network for the industrial use. The transfer system is suitable to be installed on the entire shop floor and thus ensures a location-independent wireless energy transfer. The paper shows the basic design of a primary- and secondary-sided LCC–compensated wireless power transfer system in form of an electrical equivalent circuit. The compensation capacitors and inductors are determined analytically from the equivalent circuit diagram and the values are confirmed in simulation. The system’s dynamic magnetic behavior is simulated based on a three dimensional finite element analysis. In addition, the electrical behavior is simulated by a parameterized SPICE model.
{"title":"Modular Wireless Power Transfer System for the Supply of Mobile Industrial Production Equipment","authors":"Javier Stillig, Alexander Enssle, N. Parspour","doi":"10.1109/WoW51332.2021.9462864","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462864","url":null,"abstract":"In the factory of the future, production lines have to be reconfigured more frequently than today, driven by the volatile market influences. To enable a fast, cost-effective and user-friendly reconfigurability of production equipment, it is essential to break down the complex production machinery into autonomous, mutually compatible functional units that can be positioned anywhere on the shop floor. Enabling the units to be mobile, its power supply must be wireless. This paper introduces a new design of energy transfer modules forming a complete power distribution network for the industrial use. The transfer system is suitable to be installed on the entire shop floor and thus ensures a location-independent wireless energy transfer. The paper shows the basic design of a primary- and secondary-sided LCC–compensated wireless power transfer system in form of an electrical equivalent circuit. The compensation capacitors and inductors are determined analytically from the equivalent circuit diagram and the values are confirmed in simulation. The system’s dynamic magnetic behavior is simulated based on a three dimensional finite element analysis. In addition, the electrical behavior is simulated by a parameterized SPICE model.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"13 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":"131589496","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/WoW51332.2021.9462867
Calvin Riekerk, Francesca Grazian, T. Soeiro, Jianning Dong, P. Bauer
The increase in popularity of electric vehicles (EVs) and the pursuit of user convenience makes wireless power transfer (WPT) an attractive technology for the charging of batteries. The usage of WPT in e-transportation is not straightforward because the current standardization limits the allowed operating frequency range and magnitude of the irradiated magnetic field. Although, to safeguard the zero voltage switching (ZVS) of the intrinsic inverter switches, their operating frequency needs to be slightly adapted at all time such that the circuit functions in the equivalent inductive region of the passive network. Besides the semiconductors’ soft switching, another control objective is limiting the inverter current to restrain the irradiated magnetic field. The start-up of the WPT system can be particularly challenging because uncertainties on the loading condition and coils’ misalignment can complicate these control objectives. This paper benchmarks three start-up modulation strategies for the H-bridge inverter which aim to reduce the amplitude of the transient currents and to ensure ZVS operation for the S-S compensation and double-sided LCC compensation. In addition two soft shut-down strategies are compared for the S-S compensation. The results show that the symmetrical phase-shift (SPS) control with self-oscillating feedback control, also known as Dual Control gives the best performance for S-S compensation at start-up and shut-down. The combination of frequency and SPS control starting below resonance gives the best results for the soft start-up of the double-sided LCC compensation.
{"title":"Study on Soft Start-Up and Shut-Down Methods for Wireless Power Transfer Systems for the Charging of Electric Vehicles","authors":"Calvin Riekerk, Francesca Grazian, T. Soeiro, Jianning Dong, P. Bauer","doi":"10.1109/WoW51332.2021.9462867","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462867","url":null,"abstract":"The increase in popularity of electric vehicles (EVs) and the pursuit of user convenience makes wireless power transfer (WPT) an attractive technology for the charging of batteries. The usage of WPT in e-transportation is not straightforward because the current standardization limits the allowed operating frequency range and magnitude of the irradiated magnetic field. Although, to safeguard the zero voltage switching (ZVS) of the intrinsic inverter switches, their operating frequency needs to be slightly adapted at all time such that the circuit functions in the equivalent inductive region of the passive network. Besides the semiconductors’ soft switching, another control objective is limiting the inverter current to restrain the irradiated magnetic field. The start-up of the WPT system can be particularly challenging because uncertainties on the loading condition and coils’ misalignment can complicate these control objectives. This paper benchmarks three start-up modulation strategies for the H-bridge inverter which aim to reduce the amplitude of the transient currents and to ensure ZVS operation for the S-S compensation and double-sided LCC compensation. In addition two soft shut-down strategies are compared for the S-S compensation. The results show that the symmetrical phase-shift (SPS) control with self-oscillating feedback control, also known as Dual Control gives the best performance for S-S compensation at start-up and shut-down. The combination of frequency and SPS control starting below resonance gives the best results for the soft start-up of the double-sided LCC compensation.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"58 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":"131074763","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/WoW51332.2021.9462890
R. Kheirollahi, Shuyan Zhao, Hua Zhang, Jun Wang, F. Lu
This paper studies the inductive series-parallel (SP) topology as a wireless capacitor charger for DC circuit breakers (DCCBs) including active injection circuits (AICs). The design objectives are achieving fast response time and minimized steady-state power losses. As the capacitor charging time is significant to accelerate the reclosing process in AIC DCCBs, the impacts of the input dc link voltage, the quality factor of the coils, the input-to-output voltage ratio, and the load capacitance parameters on the transient response time of the wireless SP charger are investigated. Also, a new burst mode control strategy is proposed to reduce the steady-state power losses. The developed 12V–100V wireless charger operating at 1MHz switching frequency provides isolation voltage up to 80kV considering 2kV/mm breakdown voltage between coils. Based on the experimental results, the 10μF load capacitor is charged to 80V in 2.37ms and to 90V in 2.9ms.
{"title":"Wireless Series-Parallel Capacitor Charger for DC Circuit Breaker Applications","authors":"R. Kheirollahi, Shuyan Zhao, Hua Zhang, Jun Wang, F. Lu","doi":"10.1109/WoW51332.2021.9462890","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462890","url":null,"abstract":"This paper studies the inductive series-parallel (SP) topology as a wireless capacitor charger for DC circuit breakers (DCCBs) including active injection circuits (AICs). The design objectives are achieving fast response time and minimized steady-state power losses. As the capacitor charging time is significant to accelerate the reclosing process in AIC DCCBs, the impacts of the input dc link voltage, the quality factor of the coils, the input-to-output voltage ratio, and the load capacitance parameters on the transient response time of the wireless SP charger are investigated. Also, a new burst mode control strategy is proposed to reduce the steady-state power losses. The developed 12V–100V wireless charger operating at 1MHz switching frequency provides isolation voltage up to 80kV considering 2kV/mm breakdown voltage between coils. Based on the experimental results, the 10μF load capacitor is charged to 80V in 2.37ms and to 90V in 2.9ms.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"10 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":"117194829","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/WoW51332.2021.9462887
Zhimeng Liu, Chengxuan Tao, Lifang Wang, Yuwang Zhang, Fang Li
This paper presents a research on the characteristics of wireless power transfer (WPT) system based on LCC/N magnetic integration compensation circuit. Compared with the traditional compensation circuits, the LCC/N compensation circuit has no compensation circuit on the secondary side and integrates the compensation inductor on the primary side into the transmitter. First, the two-port network considering the coupling relationship between magnetic integration compensation inductance and receiver coil is established. Then, based on the two-port network, the output impedance angle of the inverter, transmission power and efficiency of the WPT system employing LCC/N compensation circuit is analyzed under variations of coupling coefficient and load. Finally, the analysis of the characteristics of the WPT system based on the LCC/N magnetic integration compensation circuit is verified by simulations and experiments. And the results show that the analysis of characteristics is effective.
{"title":"A Research on Characteristics of Wireless Power Transfer System Based on LCC/N Magnetic Integration Compensation Circuit","authors":"Zhimeng Liu, Chengxuan Tao, Lifang Wang, Yuwang Zhang, Fang Li","doi":"10.1109/WoW51332.2021.9462887","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462887","url":null,"abstract":"This paper presents a research on the characteristics of wireless power transfer (WPT) system based on LCC/N magnetic integration compensation circuit. Compared with the traditional compensation circuits, the LCC/N compensation circuit has no compensation circuit on the secondary side and integrates the compensation inductor on the primary side into the transmitter. First, the two-port network considering the coupling relationship between magnetic integration compensation inductance and receiver coil is established. Then, based on the two-port network, the output impedance angle of the inverter, transmission power and efficiency of the WPT system employing LCC/N compensation circuit is analyzed under variations of coupling coefficient and load. Finally, the analysis of the characteristics of the WPT system based on the LCC/N magnetic integration compensation circuit is verified by simulations and experiments. And the results show that the analysis of characteristics is effective.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"34 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":"133661779","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/WoW51332.2021.9462888
Yuya Deguchi, Sakahisa Nagai, Toshiyuki Fujita, H. Fujimoto, Y. Hori
In the Wireless Power Transfer (WPT) by magnetic field resonant coupling, the presence of a metal foreign object between two coils is dangerous due to overheating caused by induction heating. Most previous studies have focused on detection methods for the static WPT (S-WPT), which targets stationary electric vehicles (EVs). In the S-WPT, the power supply time is long, and foreign metal objects tend to heat up. However, the dynamic WPT (D-WPT) is expected to generate less heat than the S-WPT because of its short power supply time and long standby time. We studied the types and sizes of metals which must be detected in D-WPT and the appropriate detection methods for them. We propose a detection method by applying voltage pulses to the transmitter circuit and measuring the steady-state value of the transmitter current. By performing detection only during the standby time specific to D-WPT, the reference impedance can be made small and free from effects of misalignment with the power receiver coil. From the heating experiment, we determined that the metals which must be detected in the 20 kW D-WPT system were ferromagnetic and the minimum size was 50 mm × 50 mm. The detection experiment showed that the invasion of the metal objects which must be detected reduced the steady-state value of transmitter current by at least 20%. In conclusion, the proposed method can be implemented at a low cost and satisfy the required detection accuracy in the D-WPT.
在磁场共振耦合的无线电力传输(WPT)中，由于感应加热引起过热，两个线圈之间存在金属异物是危险的。以往的研究大多集中在针对静止电动汽车的静态WPT (S-WPT)检测方法上。在S-WPT中，供电时间长，外来金属物体容易升温。然而，动态WPT (D-WPT)由于其供电时间短，待机时间长，预计将比S-WPT产生更少的热量。研究了D-WPT中必须检测的金属种类和尺寸，以及相应的检测方法。我们提出了一种通过施加电压脉冲到发射机电路并测量发射机电流稳态值的检测方法。通过仅在D-WPT特定的待机时间内进行检测，可以使参考阻抗很小，并且不受与电源接收器线圈不对准的影响。通过加热实验，我们确定了在20 kW的D-WPT系统中必须检测的金属是铁磁性的，最小尺寸为50 mm × 50 mm。检测实验表明，必须检测的金属物体的入侵使发射机电流的稳态值至少降低20%。综上所述，该方法可以以较低的成本实现，并满足D-WPT中所要求的检测精度。
{"title":"Sensorless Metal Object Detection Using Transmission-Side Voltage Pulses in Standby Phase for Dynamic Wireless Power Transfer","authors":"Yuya Deguchi, Sakahisa Nagai, Toshiyuki Fujita, H. Fujimoto, Y. Hori","doi":"10.1109/WoW51332.2021.9462888","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462888","url":null,"abstract":"In the Wireless Power Transfer (WPT) by magnetic field resonant coupling, the presence of a metal foreign object between two coils is dangerous due to overheating caused by induction heating. Most previous studies have focused on detection methods for the static WPT (S-WPT), which targets stationary electric vehicles (EVs). In the S-WPT, the power supply time is long, and foreign metal objects tend to heat up. However, the dynamic WPT (D-WPT) is expected to generate less heat than the S-WPT because of its short power supply time and long standby time. We studied the types and sizes of metals which must be detected in D-WPT and the appropriate detection methods for them. We propose a detection method by applying voltage pulses to the transmitter circuit and measuring the steady-state value of the transmitter current. By performing detection only during the standby time specific to D-WPT, the reference impedance can be made small and free from effects of misalignment with the power receiver coil. From the heating experiment, we determined that the metals which must be detected in the 20 kW D-WPT system were ferromagnetic and the minimum size was 50 mm × 50 mm. The detection experiment showed that the invasion of the metal objects which must be detected reduced the steady-state value of transmitter current by at least 20%. In conclusion, the proposed method can be implemented at a low cost and satisfy the required detection accuracy in the D-WPT.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"74 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":"115993158","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/WoW51332.2021.9462886
Amr Mostafa, Yao Wang, Hua Zhang, F. Lu
This digest proposes a power control strategy using a voltage boosting and frequency detuning approach in an S-S compensated EV IPT system. voltage is increased to increase output power, and frequency is increased from the resonant frequency to decrease output power, reducing the voltage range requirement of the input. The system is designed to maintain full power range control despite fluctuating load and misalignment condition. A prototype is developed that achieves 0.0–3.3kW power control across all battery load and x-y misalignment combinations. The proposed strategy is tested by constructing an experimental prototype, that achieves a peak DC/DC efficiency of 95.7%
{"title":"Output Power Control of an S-S IPT System Based on Voltage and Frequency Tuning for EV Charging","authors":"Amr Mostafa, Yao Wang, Hua Zhang, F. Lu","doi":"10.1109/WoW51332.2021.9462886","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462886","url":null,"abstract":"This digest proposes a power control strategy using a voltage boosting and frequency detuning approach in an S-S compensated EV IPT system. voltage is increased to increase output power, and frequency is increased from the resonant frequency to decrease output power, reducing the voltage range requirement of the input. The system is designed to maintain full power range control despite fluctuating load and misalignment condition. A prototype is developed that achieves 0.0–3.3kW power control across all battery load and x-y misalignment combinations. The proposed strategy is tested by constructing an experimental prototype, that achieves a peak DC/DC efficiency of 95.7%","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"70 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":"134131489","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/WoW51332.2021.9462892
Spencer Cochran, D. Costinett
Active rectifiers enhance WPT systems via tunability, high efficiency, and low waveform distortion. However, utilizing these benefits requires that two circuit characteristics are managed simultaneously: the switching frequency must be synchronized to the transmitter and the output must be regulated. Furthermore, the fundamental benefit of impedance tunability inherent to the active rectifier necessitates that this dual-objective control problem remains stable over a wide range of operating points. Either control loop can be designed in isolation, and under this premise, this work contributes a closed form derivation for the cross-coupling behaviors in the control architecture for a 7-level switched capacitor WPT system. Finally, regions of attenuated cross-coupling effects are identified and used to experimentally demonstrate wide-range control with stable output regulation and frequency synchronization.
{"title":"Wide-Range Stability of Concurrent Load Regulation and Frequency Synchronization for a 7-Level Switched Capacitor WPT Rectifier","authors":"Spencer Cochran, D. Costinett","doi":"10.1109/WoW51332.2021.9462892","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462892","url":null,"abstract":"Active rectifiers enhance WPT systems via tunability, high efficiency, and low waveform distortion. However, utilizing these benefits requires that two circuit characteristics are managed simultaneously: the switching frequency must be synchronized to the transmitter and the output must be regulated. Furthermore, the fundamental benefit of impedance tunability inherent to the active rectifier necessitates that this dual-objective control problem remains stable over a wide range of operating points. Either control loop can be designed in isolation, and under this premise, this work contributes a closed form derivation for the cross-coupling behaviors in the control architecture for a 7-level switched capacitor WPT system. Finally, regions of attenuated cross-coupling effects are identified and used to experimentally demonstrate wide-range control with stable output regulation and frequency synchronization.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"54 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":"132579924","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/WoW51332.2021.9462863
Zeeshan Shafiq, Jinglin Xia, Qingyun Min, Siqi Li, Sizhao Lu
This paper reveals the induced electric field effect on the inductive power transfer (IPT) system and proposes a reduction method for the induced electric field. The induced electric field can leak current to the ground and increase the power loss in the transmission pad. Therefore, the stray capacitance in the pad and the equivalent circuit model of the pad are introduced to analyze the effect of the induced electric field on the pad. Then a distributed compensated coil structure is proposed to reduce the induced electric field. Simulation models are built-in HFSS, and an experimental prototype is built and tested. The simulation and experimental results show that the induced electric field in the pads, the leakage current, and the power loss can be significantly reduced by using the proposed method.
{"title":"Study of the Induced Electric Field Effect on Inductive Power Transfer System","authors":"Zeeshan Shafiq, Jinglin Xia, Qingyun Min, Siqi Li, Sizhao Lu","doi":"10.1109/WoW51332.2021.9462863","DOIUrl":"https://doi.org/10.1109/WoW51332.2021.9462863","url":null,"abstract":"This paper reveals the induced electric field effect on the inductive power transfer (IPT) system and proposes a reduction method for the induced electric field. The induced electric field can leak current to the ground and increase the power loss in the transmission pad. Therefore, the stray capacitance in the pad and the equivalent circuit model of the pad are introduced to analyze the effect of the induced electric field on the pad. Then a distributed compensated coil structure is proposed to reduce the induced electric field. Simulation models are built-in HFSS, and an experimental prototype is built and tested. The simulation and experimental results show that the induced electric field in the pads, the leakage current, and the power loss can be significantly reduced by using the proposed method.","PeriodicalId":142939,"journal":{"name":"2021 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW)","volume":"67 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":"125623363","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：