Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930856
Min-Kwon Yang, Myung-chul Lee, W. Choi
This paper proposes a high-efficiency bidirectional dc-dc converter with high voltage conversion ratio for low voltage energy storage devices. For a step-up operation, the proposed converter operates with a high step-up voltage conversion ratio. It has low voltage stresses of the power switches at the low voltage side. It also has low switching losses of the output diodes at the high voltage side. For a step-down operation, the proposed converter operates with a high step-down voltage conversion ratio. It features zero-voltage switching of power switches at the high voltage side. At the low voltage side, a current doubler rectifier reduces the current ripples. Simulation verifications and experimental results are presented to verify the operation of the proposed converter.
{"title":"High-efficiency bidirectional DC-DC converter with high voltage conversion ratio","authors":"Min-Kwon Yang, Myung-chul Lee, W. Choi","doi":"10.1109/APEC.2017.7930856","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930856","url":null,"abstract":"This paper proposes a high-efficiency bidirectional dc-dc converter with high voltage conversion ratio for low voltage energy storage devices. For a step-up operation, the proposed converter operates with a high step-up voltage conversion ratio. It has low voltage stresses of the power switches at the low voltage side. It also has low switching losses of the output diodes at the high voltage side. For a step-down operation, the proposed converter operates with a high step-down voltage conversion ratio. It features zero-voltage switching of power switches at the high voltage side. At the low voltage side, a current doubler rectifier reduces the current ripples. Simulation verifications and experimental results are presented to verify the operation of the proposed converter.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116705409","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 : 2017-03-26DOI: 10.1109/APEC.2017.7931226
T. Beechner, A. Carpenter
This paper presents a high-efficiency, high-speed variable frequency drive (VFD) used in an electrically-assisted turbocharging application with the goal of reducing turbo lag and extracting electrical energy during vehicle braking and deceleration events. To maximize switching frequency and achieve high-temperature operation, SiC MOSFETs are used in lieu of Si IGBTs or MOSFETs. Furthermore, the VFD is cooled using the existing engine coolant loop, which operates near 105 deg. C. Eliminating the need for an additional 65 deg. C liquid cooling loop, which are typical of electric vehicles, significantly reducing system complexity, volume, and weight and simplifying integration. A digital sliding-mode-observer (SMO) was developed to drive the machine at a ramp rate of over 68 kRPM/sec. A dead-time compensation algorithm based upon adaptive notch filters was used to eliminate low-order current harmonics, which can degrade the sensorless control algorithm's performance. Experimental results are presented confirming the VFD's efficiency, dynamic control performance, low-THD load current, and high-temperature operation. Lastly, using a previously developed electro-thermal model, the VFD is extended to higher voltage (450 Vac) motors for application in future vehicle traction drives. The results show that the presented drive exceeds the Department of Energy's targets for traction drives in 2020.
{"title":"A >98% efficient >150 kRPM high-temperature liquid-cooled SiC VFD for hybrid-electric turbochargers","authors":"T. Beechner, A. Carpenter","doi":"10.1109/APEC.2017.7931226","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931226","url":null,"abstract":"This paper presents a high-efficiency, high-speed variable frequency drive (VFD) used in an electrically-assisted turbocharging application with the goal of reducing turbo lag and extracting electrical energy during vehicle braking and deceleration events. To maximize switching frequency and achieve high-temperature operation, SiC MOSFETs are used in lieu of Si IGBTs or MOSFETs. Furthermore, the VFD is cooled using the existing engine coolant loop, which operates near 105 deg. C. Eliminating the need for an additional 65 deg. C liquid cooling loop, which are typical of electric vehicles, significantly reducing system complexity, volume, and weight and simplifying integration. A digital sliding-mode-observer (SMO) was developed to drive the machine at a ramp rate of over 68 kRPM/sec. A dead-time compensation algorithm based upon adaptive notch filters was used to eliminate low-order current harmonics, which can degrade the sensorless control algorithm's performance. Experimental results are presented confirming the VFD's efficiency, dynamic control performance, low-THD load current, and high-temperature operation. Lastly, using a previously developed electro-thermal model, the VFD is extended to higher voltage (450 Vac) motors for application in future vehicle traction drives. The results show that the presented drive exceeds the Department of Energy's targets for traction drives in 2020.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"2004 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116897949","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 : 2017-03-26DOI: 10.1109/APEC.2017.7930842
Renke Han, N. L. Diaz Aldana, L. Meng, J. Guerrero, Qiuye Sun
A novel nonlinear droop-free distributed controller is proposed to achieve accurate current sharing and eliminate voltage drops in dc Micro-Grid (MG). Then by introducing the sample and holding scheme, the proposed controller is extended to the event-triggered-based controller which is designed based on the Lyapunov approach to guarantee the global stability and convergence instead of localized stability. Meanwhile, the event-triggered-based controller can considerably reduce the communication traffic and significantly relax the requirement for precise real-time information transmission without sacrificing system performance. An experimental setup is built to validate the effectiveness of the proposed controller by comparing with different controllers and communication strategies.
{"title":"Droop-free distributed control with event-triggered communication in DC micro-grid","authors":"Renke Han, N. L. Diaz Aldana, L. Meng, J. Guerrero, Qiuye Sun","doi":"10.1109/APEC.2017.7930842","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930842","url":null,"abstract":"A novel nonlinear droop-free distributed controller is proposed to achieve accurate current sharing and eliminate voltage drops in dc Micro-Grid (MG). Then by introducing the sample and holding scheme, the proposed controller is extended to the event-triggered-based controller which is designed based on the Lyapunov approach to guarantee the global stability and convergence instead of localized stability. Meanwhile, the event-triggered-based controller can considerably reduce the communication traffic and significantly relax the requirement for precise real-time information transmission without sacrificing system performance. An experimental setup is built to validate the effectiveness of the proposed controller by comparing with different controllers and communication strategies.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131247437","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 : 2017-03-26DOI: 10.1109/APEC.2017.7930920
Yunlong Shang, N. Cui, Qi Zhang, Chenghui Zhang
For the conventional switched capacitor converter (SCC) based equalizers, it is difficult to achieve the full equalization among cells due to the inevitable voltage fall across MOSFET switches. Particularly, when the voltage gap among cells is larger, the balancing efficiency is lower, but the balancing speed gets slower as the voltage gap gets smaller. In order to soften these downsides, this paper proposes a battery equalization topology with zero-current switching (ZCS) and zero-voltage gap (ZVG) among cells based on three-resonant-state SCCs. An additional resonant path is built to release the charge of the capacitor into the inductor in each cycle, which lays the foundations to obtain ZVG among cells, improves the balancing efficiency at a large voltage gap, and increases the balancing speed at a small voltage gap. A four-lithium-ion-cell prototype is applied to validate the theoretical analysis. Experiment results show the proposed topology demonstrates good balancing performance with ZCS and ZVG among cells.
{"title":"A battery equalizer with zero-current switching and zero-voltage gap among cells based on three-resonant-state LC converters","authors":"Yunlong Shang, N. Cui, Qi Zhang, Chenghui Zhang","doi":"10.1109/APEC.2017.7930920","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930920","url":null,"abstract":"For the conventional switched capacitor converter (SCC) based equalizers, it is difficult to achieve the full equalization among cells due to the inevitable voltage fall across MOSFET switches. Particularly, when the voltage gap among cells is larger, the balancing efficiency is lower, but the balancing speed gets slower as the voltage gap gets smaller. In order to soften these downsides, this paper proposes a battery equalization topology with zero-current switching (ZCS) and zero-voltage gap (ZVG) among cells based on three-resonant-state SCCs. An additional resonant path is built to release the charge of the capacitor into the inductor in each cycle, which lays the foundations to obtain ZVG among cells, improves the balancing efficiency at a large voltage gap, and increases the balancing speed at a small voltage gap. A four-lithium-ion-cell prototype is applied to validate the theoretical analysis. Experiment results show the proposed topology demonstrates good balancing performance with ZCS and ZVG among cells.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129762645","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 : 2017-03-26DOI: 10.1109/APEC.2017.7930751
N. Torabi, V. M. Sundaram, H. Toliyat
In this paper, a robust fault diagnosis strategy for open switch faults isolation in multiphase drives using machine learning techniques is designed. An adaptive self-recurrent wavelet neural network as a nonlinear system identifier provides estimate of a nonlinear model to generate appropriate fault symptoms based on the gate signals and actual motor currents. The significant contribution of this work is combining component-based and system-based fault diagnosis methods. A component-based signal is defined as the input of the identifier, while a system-based signal is used as the output. Advantage of the proposed method is the ability of detecting inverter faults in less than one millisecond without deploying extra hardware. This method is applicable in current controlled, speed controlled, and speed sensorless systems. The fault detection scenario is followed by a classifier to locate the fault. Discriminant Analysis and Support Vector Machines have been implemented to identify the fault location. The evaluations are supported by a laboratory setup.
{"title":"On-line fault diagnosis of multi-phase drives using self-recurrent wavelet neural networks with adaptive learning rates","authors":"N. Torabi, V. M. Sundaram, H. Toliyat","doi":"10.1109/APEC.2017.7930751","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930751","url":null,"abstract":"In this paper, a robust fault diagnosis strategy for open switch faults isolation in multiphase drives using machine learning techniques is designed. An adaptive self-recurrent wavelet neural network as a nonlinear system identifier provides estimate of a nonlinear model to generate appropriate fault symptoms based on the gate signals and actual motor currents. The significant contribution of this work is combining component-based and system-based fault diagnosis methods. A component-based signal is defined as the input of the identifier, while a system-based signal is used as the output. Advantage of the proposed method is the ability of detecting inverter faults in less than one millisecond without deploying extra hardware. This method is applicable in current controlled, speed controlled, and speed sensorless systems. The fault detection scenario is followed by a classifier to locate the fault. Discriminant Analysis and Support Vector Machines have been implemented to identify the fault location. The evaluations are supported by a laboratory setup.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126740662","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 : 2017-03-26DOI: 10.1109/APEC.2017.7930789
J. Stewart, J. Neely, J. Delhotal, J. Flicker
Advancements in IGBT device performance and reliability have been important for widespread electric vehicle (EV) and hybrid electric vehicle (HEV) adoption. However, further improvements in device performance are now limited by silicon's (Si) inherent material characteristics. New improvements are being realized in converter efficiency and power density with wide bandgap materials, such as silicon-carbide (SiC) and gallium nitride (GaN), which permit faster switching frequencies and higher temperature operation. On the horizon are ultra-wide bandgap materials such as aluminum nitride (AlN) and aluminum gallium nitride (AlGaN) which hold the potential to push the envelope further. As device operating temperatures and switching frequencies increase, however, the balance of the power conversion system becomes more important: DC bus design, filter components and thermal management. This paper considers a typical 6-puIse inverter application common in EV and HEV power systems and provides an alternative, cost-effective solution to the design of a low-impedance DC bus. In contrast to systems that use bus bars with film or electrolytic dc link capacitors, the proposed high-frequency (HF) bus design reduces parasitic resistance and inductance, tolerates higher temperature and is potentially scalable to MHz frequencies. A prototype was built and compared in simulation to the DC bus design documented for the 2010 Toyota Prius.
{"title":"DC link bus design for high frequency, high temperature converters","authors":"J. Stewart, J. Neely, J. Delhotal, J. Flicker","doi":"10.1109/APEC.2017.7930789","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930789","url":null,"abstract":"Advancements in IGBT device performance and reliability have been important for widespread electric vehicle (EV) and hybrid electric vehicle (HEV) adoption. However, further improvements in device performance are now limited by silicon's (Si) inherent material characteristics. New improvements are being realized in converter efficiency and power density with wide bandgap materials, such as silicon-carbide (SiC) and gallium nitride (GaN), which permit faster switching frequencies and higher temperature operation. On the horizon are ultra-wide bandgap materials such as aluminum nitride (AlN) and aluminum gallium nitride (AlGaN) which hold the potential to push the envelope further. As device operating temperatures and switching frequencies increase, however, the balance of the power conversion system becomes more important: DC bus design, filter components and thermal management. This paper considers a typical 6-puIse inverter application common in EV and HEV power systems and provides an alternative, cost-effective solution to the design of a low-impedance DC bus. In contrast to systems that use bus bars with film or electrolytic dc link capacitors, the proposed high-frequency (HF) bus design reduces parasitic resistance and inductance, tolerates higher temperature and is potentially scalable to MHz frequencies. A prototype was built and compared in simulation to the DC bus design documented for the 2010 Toyota Prius.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132424277","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 : 2017-03-26DOI: 10.1109/APEC.2017.7931108
Shishuo Zhao, Qiang Li, F. Lee
The paper presents a high frequency modular medium voltage AC (4160 VAC and 13.8 VAC) to low voltage DC (400 VDC) power conditioning system block (PCSB) that are scalable so that they can be used for micro grids of different scale (several-hundred kW to multi-MW). The modular approach is intended to result in higher-volume, lower-cost, less-loss power electronics building blocks that service many applications, such as DC data center and electric vehicle charge station. In this paper, a 225kW, 500 kHz PCSB is demonstrated to direct converter 4160 VAC to 400V DC for a DC date center. WBG power devices and CLLC resonant converter are used to minimize switching related loss at high frequency. The high frequency transformer of CLLC resonant converter is one of the key elements for the proposed modular approach. This paper will focus on high frequency transformer design to realize high-voltage-isolation, high-efficiency and high-density at the same time. Based on a split winding transformer structure, transformer insulation material and dimension parameters are determined referring to insulation standard. Transformer magnetic loss model is reviewed based on which loss design trade-off is carefully analyzed. Finally a 500 kHz transformer prototype has been developed and demonstrated with 30kV isolation capability, whole CLLC resonant converter holds 98% peak efficiency and 48 W/in3 power density.
{"title":"High frequency transformer design for modular power conversion from medium voltage AC to 400V DC","authors":"Shishuo Zhao, Qiang Li, F. Lee","doi":"10.1109/APEC.2017.7931108","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931108","url":null,"abstract":"The paper presents a high frequency modular medium voltage AC (4160 VAC and 13.8 VAC) to low voltage DC (400 VDC) power conditioning system block (PCSB) that are scalable so that they can be used for micro grids of different scale (several-hundred kW to multi-MW). The modular approach is intended to result in higher-volume, lower-cost, less-loss power electronics building blocks that service many applications, such as DC data center and electric vehicle charge station. In this paper, a 225kW, 500 kHz PCSB is demonstrated to direct converter 4160 VAC to 400V DC for a DC date center. WBG power devices and CLLC resonant converter are used to minimize switching related loss at high frequency. The high frequency transformer of CLLC resonant converter is one of the key elements for the proposed modular approach. This paper will focus on high frequency transformer design to realize high-voltage-isolation, high-efficiency and high-density at the same time. Based on a split winding transformer structure, transformer insulation material and dimension parameters are determined referring to insulation standard. Transformer magnetic loss model is reviewed based on which loss design trade-off is carefully analyzed. Finally a 500 kHz transformer prototype has been developed and demonstrated with 30kV isolation capability, whole CLLC resonant converter holds 98% peak efficiency and 48 W/in3 power density.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"2019 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114238750","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 : 2017-03-26DOI: 10.1109/APEC.2017.7930716
A. Amirahmadi, M. Domb, E. Persson
The LLC resonant power supply topology shows great promise for meeting the demands of increased power density while maintaining high efficiency. But there is a tradeoff between maximizing efficiency and accommodating regulation over a wide input voltage range. The most efficient designs have narrow input voltage range, therefore requiring a large DC bus capacitor to support the required holdup time, thus impeding the goal of improved density. This paper presents a design approach which enables optimization of a modified LLC resonant converter for highest efficiency, while simultaneously extending the input regulation range from 340V-400V to 280V-400V by adding a small capacitor in series with the magnetizing inductance. This so-called ‘LCLC’ topology can then use a 2X smaller DC bus cap and still maintain the same holdup time. The primary side is driven with a full bridge to reduce ripple-current on the smaller DC bus cap. A 3 kW high-frequency, high-density example is shown using a GaN full-bridge on the input side to achieve 98.4% peak efficiency while operating at 350 kHz. Experimental results compare the LCLC to a conventional LLC under identical conditions and demonstrate the wide operating range and high-density while maintaining the same high efficiency over the normal operating range.
{"title":"High power density high efficiency wide input voltage range LLC resonant converter utilizing E-mode GaN switches","authors":"A. Amirahmadi, M. Domb, E. Persson","doi":"10.1109/APEC.2017.7930716","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930716","url":null,"abstract":"The LLC resonant power supply topology shows great promise for meeting the demands of increased power density while maintaining high efficiency. But there is a tradeoff between maximizing efficiency and accommodating regulation over a wide input voltage range. The most efficient designs have narrow input voltage range, therefore requiring a large DC bus capacitor to support the required holdup time, thus impeding the goal of improved density. This paper presents a design approach which enables optimization of a modified LLC resonant converter for highest efficiency, while simultaneously extending the input regulation range from 340V-400V to 280V-400V by adding a small capacitor in series with the magnetizing inductance. This so-called ‘LCLC’ topology can then use a 2X smaller DC bus cap and still maintain the same holdup time. The primary side is driven with a full bridge to reduce ripple-current on the smaller DC bus cap. A 3 kW high-frequency, high-density example is shown using a GaN full-bridge on the input side to achieve 98.4% peak efficiency while operating at 350 kHz. Experimental results compare the LCLC to a conventional LLC under identical conditions and demonstrate the wide operating range and high-density while maintaining the same high efficiency over the normal operating range.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122263909","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 reduction of common mode (CM) noise for isolated converters has been a popular research topic. This paper proposed a generalized two-capacitor modeling technique for switching transformers with multiple windings and complicated winding structures. Based on the proposed model, a Flyback transformer with multiple winding structures is investigated. A new measurement technique to characterize and evaluate switching transformer's CM noise performance is developed. Only a signal generator and an oscilloscope are needed for the measurement and no any in-circuit tests are needed. The technique can help to quickly design and evaluate transformers for CM noise reduction in mass testing and production. CM noise reduction techniques including balance capacitor technique, core shielding technique and winding design technique are developed based on the developed two-capacitor model and measurement technique. Experimental results verify the proposed model and the developed CM noise reduction techniques.
{"title":"Techniques of the modeling, measurement and reduction of common mode noise for a multi-winding switching transformer","authors":"Yiming Li, Huan Zhang, Shuo Wang, H. Sheng, Srikanth Lakshmikanthan, Choon Ping Chng","doi":"10.1109/APEC.2017.7931051","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931051","url":null,"abstract":"The reduction of common mode (CM) noise for isolated converters has been a popular research topic. This paper proposed a generalized two-capacitor modeling technique for switching transformers with multiple windings and complicated winding structures. Based on the proposed model, a Flyback transformer with multiple winding structures is investigated. A new measurement technique to characterize and evaluate switching transformer's CM noise performance is developed. Only a signal generator and an oscilloscope are needed for the measurement and no any in-circuit tests are needed. The technique can help to quickly design and evaluate transformers for CM noise reduction in mass testing and production. CM noise reduction techniques including balance capacitor technique, core shielding technique and winding design technique are developed based on the developed two-capacitor model and measurement technique. Experimental results verify the proposed model and the developed CM noise reduction techniques.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115612724","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 : 2017-03-26DOI: 10.1109/APEC.2017.7931082
H. Long, M. Sweet, E. Narayanan, Gangru Li
The IGBT press-pack provides low inductance and simple module stack for high power and high voltage applications. In this work, the reliability of IGBT Press-Pack power modules is experimentally tested under RBSOA conditions to investigate their limitation and current scalability. The internal current distribution is analyzed by detailed 3D FEM simulation. This work reveals that the uneven distribution of current density is caused by different impedance in each IGBT die current conducting path, due to skin and proximity effects during switching transient. Stray and mutual inductances also affect current paths depending upon the location of IGBT within the package. The unbalanced switching times become larger as the package size increases with more parallel configured IGBTs. By extracting the FEM data into the proposed circuit model, the electrical performance will be discussed in detail.
{"title":"Reliability study and modelling of IGBT press-pack power modules","authors":"H. Long, M. Sweet, E. Narayanan, Gangru Li","doi":"10.1109/APEC.2017.7931082","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931082","url":null,"abstract":"The IGBT press-pack provides low inductance and simple module stack for high power and high voltage applications. In this work, the reliability of IGBT Press-Pack power modules is experimentally tested under RBSOA conditions to investigate their limitation and current scalability. The internal current distribution is analyzed by detailed 3D FEM simulation. This work reveals that the uneven distribution of current density is caused by different impedance in each IGBT die current conducting path, due to skin and proximity effects during switching transient. Stray and mutual inductances also affect current paths depending upon the location of IGBT within the package. The unbalanced switching times become larger as the package size increases with more parallel configured IGBTs. By extracting the FEM data into the proposed circuit model, the electrical performance will be discussed in detail.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"232 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115099550","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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