Pub Date : 2021-06-14DOI: 10.1109/APEC42165.2021.9487376
Peng Zhao, Yifan Jiang, Guangce Zheng, Kang Yue, Yu Liu, Minfan Fu
The inductive power transfer has been widely applied for battery charging due to several benefits. However, with the increasing output power, the parasitic resistances of coils and compensation components would cause the thermal issue on the receiver, especially for a low-voltage and high-current load. This paper is devoted to addressing the thermal issue by properly selecting receiving-side compensation network, and series (S) and CCL compensations are used as the study cases. The design boundary is derived to guide the compensation selection. It shows that the selection is dependent on the specific system parameters. However, compared with the series compensation, the CCL counterpart may give a higher design freedom and more opportunities to reduce the power loss and redistribute the heat dissipation. Finally, a prototype system with 9-V/5.4-A output is implemented to verify the analysis.
感应功率传输由于具有诸多优点，已广泛应用于电池充电中。然而，随着输出功率的增加，线圈和补偿元件的寄生电阻会引起接收器的热问题，特别是对于低压大电流负载。本文以系列(S)补偿和CCL补偿为研究案例，探讨了如何合理选择接收侧补偿网络来解决接收侧的热问题。推导出设计边界，指导补偿选择。结果表明，选择取决于系统的具体参数。然而，与串联补偿相比，CCL补偿可以提供更高的设计自由度和更多的机会来降低功耗和重新分配散热。最后，实现了一个输出为9 v /5.4 a的原型系统来验证分析结果。
{"title":"Heat Distribution of IPT Receiver with Low-Voltage and High-Current Output","authors":"Peng Zhao, Yifan Jiang, Guangce Zheng, Kang Yue, Yu Liu, Minfan Fu","doi":"10.1109/APEC42165.2021.9487376","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487376","url":null,"abstract":"The inductive power transfer has been widely applied for battery charging due to several benefits. However, with the increasing output power, the parasitic resistances of coils and compensation components would cause the thermal issue on the receiver, especially for a low-voltage and high-current load. This paper is devoted to addressing the thermal issue by properly selecting receiving-side compensation network, and series (S) and CCL compensations are used as the study cases. The design boundary is derived to guide the compensation selection. It shows that the selection is dependent on the specific system parameters. However, compared with the series compensation, the CCL counterpart may give a higher design freedom and more opportunities to reduce the power loss and redistribute the heat dissipation. Finally, a prototype system with 9-V/5.4-A output is implemented to verify the analysis.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80976406","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487021
T. Sadílek, Y. Jang, S. Hao, Minli Jia, P. Barbosa, I. Husain
A new power-factor-correction (PFC), continuous-conduction-mode (CCM) bidirectional boost rectifier for 1-ph/3-ph universal voltage input on-board charging applications is introduced. The rectifier features extended voltage gain, automatic input current sharing, and reduced voltage switching when it operates from 1-phase input voltage. Due to the extended-gain property, the proposed topology is suitable for converting low line voltages to a high dc link voltage. Switching at reduced voltage results in decreased switching losses, which allows the converter to achieve significantly increased power conversion efficiency. Unlike in standard interleaved PFC topologies, input current sharing is achieved without any sensing circuits or additional control loops. The evaluation was performed on a 3.3 kW prototype designed to operate from 85-134 V line input and deliver 775 V dc output. The prototype achieves 93.6% efficiency at 110 VRMS line input and full load. The proposed converter naturally morphs into the standard 6-switch converter for 3-phase ac voltage inputs.
{"title":"A New PFC CCM Boost Rectifier with Extended Gain and Reduced Voltage Switching for 1-ph/3-ph Universal Input On-Board Charger for Electric Vehicles","authors":"T. Sadílek, Y. Jang, S. Hao, Minli Jia, P. Barbosa, I. Husain","doi":"10.1109/APEC42165.2021.9487021","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487021","url":null,"abstract":"A new power-factor-correction (PFC), continuous-conduction-mode (CCM) bidirectional boost rectifier for 1-ph/3-ph universal voltage input on-board charging applications is introduced. The rectifier features extended voltage gain, automatic input current sharing, and reduced voltage switching when it operates from 1-phase input voltage. Due to the extended-gain property, the proposed topology is suitable for converting low line voltages to a high dc link voltage. Switching at reduced voltage results in decreased switching losses, which allows the converter to achieve significantly increased power conversion efficiency. Unlike in standard interleaved PFC topologies, input current sharing is achieved without any sensing circuits or additional control loops. The evaluation was performed on a 3.3 kW prototype designed to operate from 85-134 V line input and deliver 775 V dc output. The prototype achieves 93.6% efficiency at 110 VRMS line input and full load. The proposed converter naturally morphs into the standard 6-switch converter for 3-phase ac voltage inputs.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81084779","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487029
W. Collings, Tolen Nelson, Andrew J. Sellers, R. Khanna, A. Courtay, Sergio J. Jimenez, A. Lemmon
Circuit and device parasitics have an outsized effect on the switching voltage and current waveforms of wide bandgap semiconductors. The variation of these parasitic components greatly hinders the ability to develop simulation models of wide bandgap semiconductors that accurately predict transient device performance. As a solution, the concept of dynamic tuning has become prevalent in the modeling and simulation of wide bandgap semiconductor-based power electronics. This paper presents dynamic tuning applied to two different behavioral models of the same 100 V gallium nitride (GaN) device. Although the models are of the same device, they are disparate in their prediction capability of the device’s empirically measured static characteristics. The different static characteristics also lead to a marked discrepancy in their transient prediction capabilities. Through dynamic tuning, the error between empirically mea-sured and simulated transient characteristics is improved for both models. This paper thus shows two important results. First, the frequency dependence of the parasitic components within a circuit can be accounted for, to a first order, through dynamically tuning a constant lumped element model of the parasitics. Second, dynamic tuning can be successfully, albeit not as effectively, applied to accurately predict transient behavior even for device models that do not precisely match the data sheet.
{"title":"Optimization Algorithms for Dynamic Tuning of Wide Bandgap Semiconductor Device Models","authors":"W. Collings, Tolen Nelson, Andrew J. Sellers, R. Khanna, A. Courtay, Sergio J. Jimenez, A. Lemmon","doi":"10.1109/APEC42165.2021.9487029","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487029","url":null,"abstract":"Circuit and device parasitics have an outsized effect on the switching voltage and current waveforms of wide bandgap semiconductors. The variation of these parasitic components greatly hinders the ability to develop simulation models of wide bandgap semiconductors that accurately predict transient device performance. As a solution, the concept of dynamic tuning has become prevalent in the modeling and simulation of wide bandgap semiconductor-based power electronics. This paper presents dynamic tuning applied to two different behavioral models of the same 100 V gallium nitride (GaN) device. Although the models are of the same device, they are disparate in their prediction capability of the device’s empirically measured static characteristics. The different static characteristics also lead to a marked discrepancy in their transient prediction capabilities. Through dynamic tuning, the error between empirically mea-sured and simulated transient characteristics is improved for both models. This paper thus shows two important results. First, the frequency dependence of the parasitic components within a circuit can be accounted for, to a first order, through dynamically tuning a constant lumped element model of the parasitics. Second, dynamic tuning can be successfully, albeit not as effectively, applied to accurately predict transient behavior even for device models that do not precisely match the data sheet.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78574328","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487114
M. Elmorshedy, M. Amin, F. El-Sousy, O. Mohammed
Renewable energy systems (RESs) have grown to be a more economical and eco-friendly option for isolated applications such as ship where the grid's energy cannot be delivered. However, the presence of RESs has a significant challenge since the generation mainly depends on meteorological conditions. Moreover, the ship applications contain pulsed load which cause high power pulsation, voltage drop, and instability in the overall system. This paper proposes a robust hybrid energy storage system (HESS) with an effective energy management. Besides, extracting the maximum generated power and regulating both the DC-bus and AC-bus voltages under different conditions such as changing the load demand, and different unsteady meteorological conditions. The HESS consists of battery energy storage system (BESS) and superconducting magnetic energy storage (SMES). The HESS is able to improve the stability of the DC-bus during the pulse load rather than the BESS only and SMES only. The performance of the proposed system with its control strategies are verified by test results.
{"title":"DC-Bus Voltage Control of MPPT-based Wind Generation System Using Hybrid BESS-SMES System for Pulse Loads in Ship Power Applications","authors":"M. Elmorshedy, M. Amin, F. El-Sousy, O. Mohammed","doi":"10.1109/APEC42165.2021.9487114","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487114","url":null,"abstract":"Renewable energy systems (RESs) have grown to be a more economical and eco-friendly option for isolated applications such as ship where the grid's energy cannot be delivered. However, the presence of RESs has a significant challenge since the generation mainly depends on meteorological conditions. Moreover, the ship applications contain pulsed load which cause high power pulsation, voltage drop, and instability in the overall system. This paper proposes a robust hybrid energy storage system (HESS) with an effective energy management. Besides, extracting the maximum generated power and regulating both the DC-bus and AC-bus voltages under different conditions such as changing the load demand, and different unsteady meteorological conditions. The HESS consists of battery energy storage system (BESS) and superconducting magnetic energy storage (SMES). The HESS is able to improve the stability of the DC-bus during the pulse load rather than the BESS only and SMES only. The performance of the proposed system with its control strategies are verified by test results.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85786553","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487328
Xinyuan Du, Fei Diao, Zhe Zhao, Yue Zhao
In this work, a 25 kW all silicon carbide (SiC) series-resonant converter (SRC) design is proposed to enable a single stage dc to dc conversion from 3kV to 540V (±270V) for future electric aircraft applications. The proposed SRC consists of a 3-level neutral-point-clamped (NPC) converter using 3.3kV discrete SiC MOSFETs on the primary side, a H-bridge converter using 900V SiC MOSFET modules on the secondary side and a high frequency (HF) transformer. The detailed design methods for the SRC power stage and the HF transformer are presented. Especially, a tradeoff between the complexity for the cooling system and the need for power density is addressed in the transformer design, leading to a novel multi-layer winding layout. To validate the effectiveness of the proposed SRC design, a converter prototype has been developed and comprehensive experimental studies are performed.
在这项工作中，提出了一种25 kW的全碳化硅(SiC)串联谐振变换器(SRC)设计，以实现从3kV到540V(±270V)的单级直流到直流转换，用于未来的电动飞机应用。提出的SRC包括一个3电平中性点箝位(NPC)变换器，在初级侧使用3.3kV离散SiC MOSFET，在次级侧使用900V SiC MOSFET模块的h桥变换器和一个高频(HF)变压器。介绍了SRC功率级和高频变压器的详细设计方法。特别是，在变压器设计中解决了冷却系统复杂性和功率密度需求之间的权衡，导致了一种新颖的多层绕组布局。为了验证所提出的SRC设计的有效性，开发了一个转换器原型并进行了全面的实验研究。
{"title":"A 25kW Silicon Carbide 3kV/540V Series-Resonant Converter for Electric Aircraft Systems","authors":"Xinyuan Du, Fei Diao, Zhe Zhao, Yue Zhao","doi":"10.1109/APEC42165.2021.9487328","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487328","url":null,"abstract":"In this work, a 25 kW all silicon carbide (SiC) series-resonant converter (SRC) design is proposed to enable a single stage dc to dc conversion from 3kV to 540V (±270V) for future electric aircraft applications. The proposed SRC consists of a 3-level neutral-point-clamped (NPC) converter using 3.3kV discrete SiC MOSFETs on the primary side, a H-bridge converter using 900V SiC MOSFET modules on the secondary side and a high frequency (HF) transformer. The detailed design methods for the SRC power stage and the HF transformer are presented. Especially, a tradeoff between the complexity for the cooling system and the need for power density is addressed in the transformer design, leading to a novel multi-layer winding layout. To validate the effectiveness of the proposed SRC design, a converter prototype has been developed and comprehensive experimental studies are performed.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84077908","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487340
N. Swaminathan, L. N, Yue Cao
Buck-Boost based full-bridge DC-DC converters possess potentials for high gain, high power applications, particularly in solar PV, battery, and fuel-cell fed systems, as the converters feature non-pulsating input and output currents. However, these converters lack attention due to the presence of DC-current in the transformer winding. In this paper, a novel Buck-Boost full-bridge (BBFB) converter with a hybrid control scheme (HCS) mitigating the transformer DC-current is presented. The BBFB converter exhibits inherent soft-switching such that zero voltage switching (ZVS) conditions apply for individual switches. This paper analyzes the BBFB converter extensively, including the discontinuous conduction mode (DCM) operation and the DCM boundary condition. A dynamic behavior of the BBFB converter under a load step change verifies that the HCS scheme does not affect the converter performance. Besides, this work presents a model for the high frequency oscillations that occur in the practical transformer current waveform due to parasitic capacitances. All the analyses and the developed models are verified in simulations and hardware experiments. The developed models are useful for designing the BBFB converter with improved efficiency by ensuring the ZVS operation. Further, the developed models and results provide an insight for the DC voltage gain variations during DCM and continuous conduction mode (CCM). This helps the designer to choose the BBFB converter’s operating mode based on the requirement.
{"title":"DCM and CCM Operation of Buck-Boost Full-Bridge DC-DC Converter","authors":"N. Swaminathan, L. N, Yue Cao","doi":"10.1109/APEC42165.2021.9487340","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487340","url":null,"abstract":"Buck-Boost based full-bridge DC-DC converters possess potentials for high gain, high power applications, particularly in solar PV, battery, and fuel-cell fed systems, as the converters feature non-pulsating input and output currents. However, these converters lack attention due to the presence of DC-current in the transformer winding. In this paper, a novel Buck-Boost full-bridge (BBFB) converter with a hybrid control scheme (HCS) mitigating the transformer DC-current is presented. The BBFB converter exhibits inherent soft-switching such that zero voltage switching (ZVS) conditions apply for individual switches. This paper analyzes the BBFB converter extensively, including the discontinuous conduction mode (DCM) operation and the DCM boundary condition. A dynamic behavior of the BBFB converter under a load step change verifies that the HCS scheme does not affect the converter performance. Besides, this work presents a model for the high frequency oscillations that occur in the practical transformer current waveform due to parasitic capacitances. All the analyses and the developed models are verified in simulations and hardware experiments. The developed models are useful for designing the BBFB converter with improved efficiency by ensuring the ZVS operation. Further, the developed models and results provide an insight for the DC voltage gain variations during DCM and continuous conduction mode (CCM). This helps the designer to choose the BBFB converter’s operating mode based on the requirement.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77952564","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487407
Jean M. L. Fonseca, S. Reddy, K. Rajashekara, K. Raj
Asymmetric grid voltage conditions can result in uneven three phase operation of grid connected power converters. Operation of Modular Multilevel Converter (MMC) having submodules with energy storage elements under such grid conditions can result in unbalanced state of charge (SOC) among battery modules, which is undesirable. In this paper, power balancing strategies for resilient operation of BESS using a double-star chopper cell (DSCC) topology based MMC under asymmetric AC grid voltage scenarios are proposed. This is achieved through power balancing techniques using external output grid current control and control of circulating currents that are internal to the converter. The internal power balancing technique is further extended to obtain per-phase SOC-balancing, without exceeding rated operating power condition, even under adverse grid voltage scenarios.
{"title":"Active Power and SOC Balancing Techniques for Resilient Battery Energy Storage Systems under Asymmetric Grid Voltage Scenarios","authors":"Jean M. L. Fonseca, S. Reddy, K. Rajashekara, K. Raj","doi":"10.1109/APEC42165.2021.9487407","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487407","url":null,"abstract":"Asymmetric grid voltage conditions can result in uneven three phase operation of grid connected power converters. Operation of Modular Multilevel Converter (MMC) having submodules with energy storage elements under such grid conditions can result in unbalanced state of charge (SOC) among battery modules, which is undesirable. In this paper, power balancing strategies for resilient operation of BESS using a double-star chopper cell (DSCC) topology based MMC under asymmetric AC grid voltage scenarios are proposed. This is achieved through power balancing techniques using external output grid current control and control of circulating currents that are internal to the converter. The internal power balancing technique is further extended to obtain per-phase SOC-balancing, without exceeding rated operating power condition, even under adverse grid voltage scenarios.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73170801","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487238
Saleh Farzamkia, Arash Khoshkbar-Sadigh, V. Dargahi
This paper focuses on the operation of hybrid modular multilevel converter and proposes an effective approach that guarantees the full performance of the converter even in post-fault condition. The main novelty of this paper is utilizing negative arm voltage levels in a way to compensate the missed voltage. After the fault occurrence, the DC component of the arm voltages as well as the DC-link voltage are adjusted based on the fault states to restore the nominal balanced line-to-line voltage in the post-fault condition. In comparison with the previous methods, the proposed method does not add any hardware to the circuit to restore the nominal output voltage. The capacitor voltage of submodules, also, does not increase after fault occurrence. Therefore, the converter can maintain its nominal line-to-line voltage in post-fault condition without extra implementation costs or overdesign requirements. To validate the effectiveness of the proposed method, detailed simulation and experimental results are provided.
{"title":"A Fault-Tolerant Approach for Hybrid Modular Multilevel Converter Using Negative Voltage Levels","authors":"Saleh Farzamkia, Arash Khoshkbar-Sadigh, V. Dargahi","doi":"10.1109/APEC42165.2021.9487238","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487238","url":null,"abstract":"This paper focuses on the operation of hybrid modular multilevel converter and proposes an effective approach that guarantees the full performance of the converter even in post-fault condition. The main novelty of this paper is utilizing negative arm voltage levels in a way to compensate the missed voltage. After the fault occurrence, the DC component of the arm voltages as well as the DC-link voltage are adjusted based on the fault states to restore the nominal balanced line-to-line voltage in the post-fault condition. In comparison with the previous methods, the proposed method does not add any hardware to the circuit to restore the nominal output voltage. The capacitor voltage of submodules, also, does not increase after fault occurrence. Therefore, the converter can maintain its nominal line-to-line voltage in post-fault condition without extra implementation costs or overdesign requirements. To validate the effectiveness of the proposed method, detailed simulation and experimental results are provided.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86804856","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}
The magnetic core plays a very important role in high frequency switching transformer modeling, design as well as loss estimation, etc. Extract the core loss from the winding loss accurately is essential in many industrial applications. Usually, A power amplifier connected to a function generator is applied to add the excitation to the CUT (core under test). For practical applications, sometimes, a square-wave or triangular-wave excitation, which depends on the working condition, is required to be added to the CUT. However, sometimes, it is found the non-sinusoidal excitations added on the CUT are distorted, which brings difficulties to accurate core loss measurement. In this paper, a detailed explanation for this phenomenon is given, several convenient solutions to improve the non-sinusoidal waveforms are explored based on the theoretical analysis. Both the simulation and experiment verify the analysis.
{"title":"Investigate and Improve the Distorted Waveforms for Core Loss Measurement with Arbitrary Excitations","authors":"Zhedong Ma, Juntao Yao, Yanwen Lai, Shuo Wang, H. Sheng, Srikanth Lakshmikanthan","doi":"10.1109/APEC42165.2021.9487313","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487313","url":null,"abstract":"The magnetic core plays a very important role in high frequency switching transformer modeling, design as well as loss estimation, etc. Extract the core loss from the winding loss accurately is essential in many industrial applications. Usually, A power amplifier connected to a function generator is applied to add the excitation to the CUT (core under test). For practical applications, sometimes, a square-wave or triangular-wave excitation, which depends on the working condition, is required to be added to the CUT. However, sometimes, it is found the non-sinusoidal excitations added on the CUT are distorted, which brings difficulties to accurate core loss measurement. In this paper, a detailed explanation for this phenomenon is given, several convenient solutions to improve the non-sinusoidal waveforms are explored based on the theoretical analysis. Both the simulation and experiment verify the analysis.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87555350","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 : 2021-06-14DOI: 10.1109/APEC42165.2021.9487108
Feng Jin, Ahmed Nabih, Chen Chen, Xingyu Chen, Qiang Li, F. Lee
Increased attention is being paid to the solid-state-transformer (SST) based charging station which requires a high efficiency high power density DC/DC stage. This framework would provide universal charging for all electric vehicles (EVs) no matter their battery voltage is 400 V or 800 V. In this paper, a two stage DC/DC converter consisting of a three-phase (3P) CLLC converter and four-phase interleaving Buck converter is proposed to achieve a wide output voltage range from 200 V to 800 V with bi-directional energy transfer capability. With SiC devices, a PCB winding based six-leg integrated transformer is used for the 3P transformer, and a PCB winding based EI core is used for the negative coupling inductors. The detailed design process of integrated magnetics is presented. A 12.5 kW prototype with over 97.7 % efficiency and 100 W/in3 power density is built to verify the feasibility of the proposed structure.
{"title":"A High Efficiency High Density DC/DC Converter for Battery Charger Applications","authors":"Feng Jin, Ahmed Nabih, Chen Chen, Xingyu Chen, Qiang Li, F. Lee","doi":"10.1109/APEC42165.2021.9487108","DOIUrl":"https://doi.org/10.1109/APEC42165.2021.9487108","url":null,"abstract":"Increased attention is being paid to the solid-state-transformer (SST) based charging station which requires a high efficiency high power density DC/DC stage. This framework would provide universal charging for all electric vehicles (EVs) no matter their battery voltage is 400 V or 800 V. In this paper, a two stage DC/DC converter consisting of a three-phase (3P) CLLC converter and four-phase interleaving Buck converter is proposed to achieve a wide output voltage range from 200 V to 800 V with bi-directional energy transfer capability. With SiC devices, a PCB winding based six-leg integrated transformer is used for the 3P transformer, and a PCB winding based EI core is used for the negative coupling inductors. The detailed design process of integrated magnetics is presented. A 12.5 kW prototype with over 97.7 % efficiency and 100 W/in3 power density is built to verify the feasibility of the proposed structure.","PeriodicalId":7050,"journal":{"name":"2021 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88120283","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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