Pub Date : 2023-03-19DOI: 10.1109/APEC43580.2023.10131660
Daniel Ríos Linares, M. Vasić
In applications with a high step-down voltage as in aircraft applications, finding a topology able to achieve high power density and high efficiency while begin EMI-friendly is crucial. Gallium Nitride devices enable high frequency switching, allowing the shrinkage of the magnetic components. The drawback however is the lower efficiency due to switching losses and electromagnetic interference constraints. The focus of this research work is the evaluation of a Three-Phase LLC converter, which, due to its inherent step-down nature (wye-delta transformer), integration capability, low input and output current ripple and high efficiency (ZVS on the entire load conditions), may be a promising solution for a high power density and modular DC/DC converter. Specifications in avionics are very challenging and include a wide input voltage range (235–300 V), a large step-down to the fully controlled 28 V in a half-brick form factor (47 cm3) for a nominal output power of 1 kW leading to a power density of 20 kW/L.
{"title":"High Power Density Three-Phase LLC DC/DC Converter with Coupled Resonant Inductor and Wye-Delta Transformer for Aircraft Applications","authors":"Daniel Ríos Linares, M. Vasić","doi":"10.1109/APEC43580.2023.10131660","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131660","url":null,"abstract":"In applications with a high step-down voltage as in aircraft applications, finding a topology able to achieve high power density and high efficiency while begin EMI-friendly is crucial. Gallium Nitride devices enable high frequency switching, allowing the shrinkage of the magnetic components. The drawback however is the lower efficiency due to switching losses and electromagnetic interference constraints. The focus of this research work is the evaluation of a Three-Phase LLC converter, which, due to its inherent step-down nature (wye-delta transformer), integration capability, low input and output current ripple and high efficiency (ZVS on the entire load conditions), may be a promising solution for a high power density and modular DC/DC converter. Specifications in avionics are very challenging and include a wide input voltage range (235–300 V), a large step-down to the fully controlled 28 V in a half-brick form factor (47 cm3) for a nominal output power of 1 kW leading to a power density of 20 kW/L.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123596693","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131662
Mehdi Abbasi, Kajanan Kanathipan, Muhammad Ali Masood Cheema, J. Lam
In this paper, a new high voltage gain PV medium voltage (MV) grid-connected inverter system that eliminates the line frequency step-up transformer is proposed. The proposed MV PV step-up inverter configuration consists of (1) modular high voltage gain resonant dc/dc converter modules with extended high efficiency from full load to reduced load conditions, and (2) a high voltage neutral point clamped (NPC) 5-level grid-connected inverter system. The presented step-up dc/dc converter module is able to regulate the dc-link voltage by the phase shift control and PWM control in the auxiliary switch of the output voltage quadrupler (VQ). In addition, maximum power point tracking for each PV array is achieved via variable frequency (VF) control in each dc/dc converter module. A 5-level NPC grid-connected inverter with integrated dc-link voltage balancer was also presented. The steady-state and dynamic performance of the proposed modular system are validated through simulation results on a silicon carbide (SiC) based 27kVrms (L-L) 60Hz output, 410kW system and preliminary experimental results on a proof-of-concept 6.6kV dc-link, 10kW SiC laboratory prototype.
{"title":"A Line-Frequency Transformer-Less High Frequency Medium Voltage PV Grid Connected Inverter With Extended High Voltage Gain Range","authors":"Mehdi Abbasi, Kajanan Kanathipan, Muhammad Ali Masood Cheema, J. Lam","doi":"10.1109/APEC43580.2023.10131662","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131662","url":null,"abstract":"In this paper, a new high voltage gain PV medium voltage (MV) grid-connected inverter system that eliminates the line frequency step-up transformer is proposed. The proposed MV PV step-up inverter configuration consists of (1) modular high voltage gain resonant dc/dc converter modules with extended high efficiency from full load to reduced load conditions, and (2) a high voltage neutral point clamped (NPC) 5-level grid-connected inverter system. The presented step-up dc/dc converter module is able to regulate the dc-link voltage by the phase shift control and PWM control in the auxiliary switch of the output voltage quadrupler (VQ). In addition, maximum power point tracking for each PV array is achieved via variable frequency (VF) control in each dc/dc converter module. A 5-level NPC grid-connected inverter with integrated dc-link voltage balancer was also presented. The steady-state and dynamic performance of the proposed modular system are validated through simulation results on a silicon carbide (SiC) based 27kVrms (L-L) 60Hz output, 410kW system and preliminary experimental results on a proof-of-concept 6.6kV dc-link, 10kW SiC laboratory prototype.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114886331","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131451
F. S. Bagci, Richard Angsetya, Sean Logi, Katherine A. Kim
Powering wearables using energy-harvesting technologies is a viable approach to increase their reliability. However, integrating electronics with fabric presents challenges requiring unique design solutions. Forming stable physical connections, from the power source to the device load and the power converter in between, is a crucial aspect of the design. Further, the connections must not interfere with user activity or affect the wearable's functionality. The primary connections investigated in this study are a) attachment of a flexible PCB to fabric and b) construction of on-fabric conductive traces. Several methods for establishing these connections are proposed and tested to identify the most efficient methods. The results indicate machine-sewn conductive thread to have the least resistance and be the most resilient method, whereas buttons performed the second best while enabling detachability. For on-fabric conductive traces, a couching method reinforced with a conductive ribbon showed the best performance regarding resistivity and power loss.
{"title":"Flexible PCB Connection Methods for Wearable Energy Harvesting Applications","authors":"F. S. Bagci, Richard Angsetya, Sean Logi, Katherine A. Kim","doi":"10.1109/APEC43580.2023.10131451","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131451","url":null,"abstract":"Powering wearables using energy-harvesting technologies is a viable approach to increase their reliability. However, integrating electronics with fabric presents challenges requiring unique design solutions. Forming stable physical connections, from the power source to the device load and the power converter in between, is a crucial aspect of the design. Further, the connections must not interfere with user activity or affect the wearable's functionality. The primary connections investigated in this study are a) attachment of a flexible PCB to fabric and b) construction of on-fabric conductive traces. Several methods for establishing these connections are proposed and tested to identify the most efficient methods. The results indicate machine-sewn conductive thread to have the least resistance and be the most resilient method, whereas buttons performed the second best while enabling detachability. For on-fabric conductive traces, a couching method reinforced with a conductive ribbon showed the best performance regarding resistivity and power loss.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114890810","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131538
A. Zare, Silvanus D’silva, M. Shadmand
The modern paradigm of power electronics dominated grid (PEDG) has facilitated integration of grid forming (GFM) and grid following (GFL) inverters in the power systems. Addressing the potential disturbances in the PEDG will demand frequent reconfigurations including dynamic adjustment of these grid-interactive inverters' power contributions. However, such dynamic adjustments in GFM-GFL inverters' power contributions may in turn introduce stability issues. The optimal ratio of GFM to GFL inverters in a PEDG has not been well studied in literature with regards to system resiliency and reliable power delivery. This paper provides an analytical approach to determine the optimal ratio of GFM and GFL inverters to minimize their adverse dynamic interactions when subjected to severe disturbances. The main objective of this paper is to provide a comprehensive dynamic interaction-based analysis for a fleet of GFM and GFL inverters within a grid cluster and investigate the impact of inertia level emulated by these GFM inverters on the PEDG resiliency. The provided analysis is validated via several case studies in large-scale simulation representing a grid cluster with multiple GFM and GFL inverters.
{"title":"Optimal Ratio of Grid-Forming to Grid-Following Inverters Towards Resilient Power Electronics Dominated Grids","authors":"A. Zare, Silvanus D’silva, M. Shadmand","doi":"10.1109/APEC43580.2023.10131538","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131538","url":null,"abstract":"The modern paradigm of power electronics dominated grid (PEDG) has facilitated integration of grid forming (GFM) and grid following (GFL) inverters in the power systems. Addressing the potential disturbances in the PEDG will demand frequent reconfigurations including dynamic adjustment of these grid-interactive inverters' power contributions. However, such dynamic adjustments in GFM-GFL inverters' power contributions may in turn introduce stability issues. The optimal ratio of GFM to GFL inverters in a PEDG has not been well studied in literature with regards to system resiliency and reliable power delivery. This paper provides an analytical approach to determine the optimal ratio of GFM and GFL inverters to minimize their adverse dynamic interactions when subjected to severe disturbances. The main objective of this paper is to provide a comprehensive dynamic interaction-based analysis for a fleet of GFM and GFL inverters within a grid cluster and investigate the impact of inertia level emulated by these GFM inverters on the PEDG resiliency. The provided analysis is validated via several case studies in large-scale simulation representing a grid cluster with multiple GFM and GFL inverters.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114954131","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131441
Yu-Hsin Wu, K. Shigematsu, Yasumichi Omoto, Yoshihiro Ikushima, J. Imaoka, Masayoshi Yamamoto
This research investigates the accuracy of Dowell model (DM) and builds an accurate and practically useful semi-analytical method for leakage inductance modeling of foil winding transformers. As a widely used model for AC resistance and leakage inductance, DM is well known for its high applicability and high accuracy compared to the other modeling methods. However, it is found that transformers with certain geometrical conditions are used in most works of literature for implementing DM. Although some analyses about the modeling accuracy were conducted, the applicability of DM for some geometry is still unclear. Therefore, in this research, the accuracy of the modeling is analyzed, focusing on the frequency and geometry dependency of foil winding. Some results show the modeling error of DM has frequency dependency. Furthermore, modeling using DM with Artificial Neural Network (ANN) is implemented to achieve more practically usable modeling. As a result, the utility could be proved with accurate modeling results of the transformer samples. Some advantages are also discussed to show more possibility of developing this method.
{"title":"An Implementation of Dowell model with Neural Network to Foil Winding Transformer","authors":"Yu-Hsin Wu, K. Shigematsu, Yasumichi Omoto, Yoshihiro Ikushima, J. Imaoka, Masayoshi Yamamoto","doi":"10.1109/APEC43580.2023.10131441","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131441","url":null,"abstract":"This research investigates the accuracy of Dowell model (DM) and builds an accurate and practically useful semi-analytical method for leakage inductance modeling of foil winding transformers. As a widely used model for AC resistance and leakage inductance, DM is well known for its high applicability and high accuracy compared to the other modeling methods. However, it is found that transformers with certain geometrical conditions are used in most works of literature for implementing DM. Although some analyses about the modeling accuracy were conducted, the applicability of DM for some geometry is still unclear. Therefore, in this research, the accuracy of the modeling is analyzed, focusing on the frequency and geometry dependency of foil winding. Some results show the modeling error of DM has frequency dependency. Furthermore, modeling using DM with Artificial Neural Network (ANN) is implemented to achieve more practically usable modeling. As a result, the utility could be proved with accurate modeling results of the transformer samples. Some advantages are also discussed to show more possibility of developing this method.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115051601","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131428
Amin Y. Fard, Satya Naidu, Horthense Tamdem, B. Vafakhah
Traditionally, in the microprocessor industry, multiphase Voltage Regulators (VRs) are implemented with discrete non-coupled inductors in each phase. Recently, Trans-Inductor Voltage Regulators (TLVRs) have been proposed in the literature where the discrete inductors are replaced with transformers while all of their secondary windings are connected in series with a compensating inductor. Any sudden changes in phase currents will enable remaining phases to contribute during load transients improving the overall VR transient capability which decreases decoupling solution requirement of the converter. Although TLVR solutions have been widely adopted in XPU (CPU or GPU) industry, still there is a lack of in-depth analysis and comparative study in regard to the conventional discrete solutions. This paper aims to provide a holistic analytical and experimental comparative study over conventional discrete multiphase VRs versus TLVRs from various viewpoints, such as design, performance (steady state and transient), bandwidth, efficiency, power delivery (single-sided versus dual-sided), and cost.
{"title":"Trans- Inductors versus Discrete Inductors in Multiphase Voltage Regulators: An Analytical and Experimental Comparative Study","authors":"Amin Y. Fard, Satya Naidu, Horthense Tamdem, B. Vafakhah","doi":"10.1109/APEC43580.2023.10131428","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131428","url":null,"abstract":"Traditionally, in the microprocessor industry, multiphase Voltage Regulators (VRs) are implemented with discrete non-coupled inductors in each phase. Recently, Trans-Inductor Voltage Regulators (TLVRs) have been proposed in the literature where the discrete inductors are replaced with transformers while all of their secondary windings are connected in series with a compensating inductor. Any sudden changes in phase currents will enable remaining phases to contribute during load transients improving the overall VR transient capability which decreases decoupling solution requirement of the converter. Although TLVR solutions have been widely adopted in XPU (CPU or GPU) industry, still there is a lack of in-depth analysis and comparative study in regard to the conventional discrete solutions. This paper aims to provide a holistic analytical and experimental comparative study over conventional discrete multiphase VRs versus TLVRs from various viewpoints, such as design, performance (steady state and transient), bandwidth, efficiency, power delivery (single-sided versus dual-sided), and cost.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115063859","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131466
D. P. Fernandez, R. Fantino, Roderick A. Gomez Jimenez, J. Balda
This work presents a non-dissipative regenerative snubber solution having passive and active components for isolated DC-DC Cuk converters. The snubber suppresses the over-voltage produced across the main switch of the convert during the turn-off interval, intrinsic of the topology and caused by the leakage inductance of the transformer. This regenerative snubber, instead of being connected in parallel with the main switch as a conventional passive and dissipative snubber, is connected directly to the terminals of the transformer which allows the snubber capacitor to not be discharged through the switch at every switching cycle, reducing device turn-on losses and stresses. A passive and active approach of the proposed snubber is presented, analyzed, and studied. The validity and effectiveness of the proposal is demonstrated by simulation and experimental results on a 2.5-kW DC-DC isolated Cuk converter prototype.
{"title":"Non-Dissipative Regenerative Snubber for Isolated DC-DC Cuk Converter","authors":"D. P. Fernandez, R. Fantino, Roderick A. Gomez Jimenez, J. Balda","doi":"10.1109/APEC43580.2023.10131466","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131466","url":null,"abstract":"This work presents a non-dissipative regenerative snubber solution having passive and active components for isolated DC-DC Cuk converters. The snubber suppresses the over-voltage produced across the main switch of the convert during the turn-off interval, intrinsic of the topology and caused by the leakage inductance of the transformer. This regenerative snubber, instead of being connected in parallel with the main switch as a conventional passive and dissipative snubber, is connected directly to the terminals of the transformer which allows the snubber capacitor to not be discharged through the switch at every switching cycle, reducing device turn-on losses and stresses. A passive and active approach of the proposed snubber is presented, analyzed, and studied. The validity and effectiveness of the proposal is demonstrated by simulation and experimental results on a 2.5-kW DC-DC isolated Cuk converter prototype.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115200026","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131539
Liyang Du, Yuxiang Chen, Xia Du, Haodong Yang, Hao Chen, H. Mantooth
Improving current capability of SiC MOSFET is an essential topic for SiC applications. Modular package is a widely applied solution with outstanding power density and integration merit. More dies are paralleled into one module to improve power density, and an auxiliary circuit, like a gate driver, is packaged inside to enhance integration. In this paper, a built-in gate driver is designed to drive a 1.7kV/1.6kA, 32-chip paralleled SiC MOSFET module. To realize the desired feature of the module, corresponding design considerations of the gate driver are discussed. Firstly, the parameters related to driving capability are figured out following a design procedure. Secondly, the delay effect in a transmission line is discussed, and a model is built to analyze the gate-to-source voltage mismatch among dies assembled at different positions. A differentiated threshold voltage strategy for arranging and selecting dies is applied to cancel mismatches. Finally, double pulse test experiments prove the feasibility of the proposed gate driver and corresponding design methods.
{"title":"A Build-in Gate Driver Design for 1.7kV SiC MOSFET Module with 32-chip Paralleled","authors":"Liyang Du, Yuxiang Chen, Xia Du, Haodong Yang, Hao Chen, H. Mantooth","doi":"10.1109/APEC43580.2023.10131539","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131539","url":null,"abstract":"Improving current capability of SiC MOSFET is an essential topic for SiC applications. Modular package is a widely applied solution with outstanding power density and integration merit. More dies are paralleled into one module to improve power density, and an auxiliary circuit, like a gate driver, is packaged inside to enhance integration. In this paper, a built-in gate driver is designed to drive a 1.7kV/1.6kA, 32-chip paralleled SiC MOSFET module. To realize the desired feature of the module, corresponding design considerations of the gate driver are discussed. Firstly, the parameters related to driving capability are figured out following a design procedure. Secondly, the delay effect in a transmission line is discussed, and a model is built to analyze the gate-to-source voltage mismatch among dies assembled at different positions. A differentiated threshold voltage strategy for arranging and selecting dies is applied to cancel mismatches. Finally, double pulse test experiments prove the feasibility of the proposed gate driver and corresponding design methods.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115341679","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 : 2023-03-19DOI: 10.1109/APEC43580.2023.10131482
Teja Golla, S. Kapat, Nagabhushana Chittaragi, Ravikumar A Setty, Sucheendran Sridharan
With the growing computational requirement in powerful digital processors in modern smartphone and automotive applications, multiphase buck converters remain an attractive power management solution to achieve higher efficiency over a wide load current range with better thermal distribution and faster load as well as DVS transient performance with the reduced output capacitor. Also, a high switching frequency is desirable for a smaller form factor, which makes it difficult to sense fast-changing phase currents. Fixed frequency voltage mode control (VMC) remains a cost-effective solution in terms of phase shifting and phase shading; however, the challenges remain in achieving fast transient performance and accurate phase current balancing. This paper considers a VMC multiphase buck converter and proposes a novel current balancing method and controller tuning algorithm to achieve fast transient with accurate phase current balancing for master-master VMC configuration. Small-signal-based PID and type-III compensator design methods are considered for the controller design. Finally, a large-signal based PID controller is computed, which can significantly improve the transient performance and is demonstrated using simulation results. A four-phase buck converter prototype is fabricated, and a few experimental results are presented.
{"title":"Controller Design and Phase Current Balancing for Fast Dynamic Performance in Voltage Mode Controlled Multiphase Buck Converters","authors":"Teja Golla, S. Kapat, Nagabhushana Chittaragi, Ravikumar A Setty, Sucheendran Sridharan","doi":"10.1109/APEC43580.2023.10131482","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131482","url":null,"abstract":"With the growing computational requirement in powerful digital processors in modern smartphone and automotive applications, multiphase buck converters remain an attractive power management solution to achieve higher efficiency over a wide load current range with better thermal distribution and faster load as well as DVS transient performance with the reduced output capacitor. Also, a high switching frequency is desirable for a smaller form factor, which makes it difficult to sense fast-changing phase currents. Fixed frequency voltage mode control (VMC) remains a cost-effective solution in terms of phase shifting and phase shading; however, the challenges remain in achieving fast transient performance and accurate phase current balancing. This paper considers a VMC multiphase buck converter and proposes a novel current balancing method and controller tuning algorithm to achieve fast transient with accurate phase current balancing for master-master VMC configuration. Small-signal-based PID and type-III compensator design methods are considered for the controller design. Finally, a large-signal based PID controller is computed, which can significantly improve the transient performance and is demonstrated using simulation results. A four-phase buck converter prototype is fabricated, and a few experimental results are presented.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116128004","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 microwave power transmission system (MPT) is one of the most promising technologies in the long-range wireless power transfer field. However, the transmission efficiency limits the performance of MPT, which can be improved by adapting the phase of each transmitting antenna to increase the amount of constructive interference at the receiver. It is challenging to achieve the stability and fast convergence of the phase algorithm due to a large number of the transmitting antennas. In this paper, a rapid phase adaptation algorithm based on the golden section and bisection method (GSS_BI) is proposed. In the proposed method, the mathematical model between the phase of the transmitters and the power of the receiver is established, which plays a significant role in designing the phase adaptation algorithm. Then the GSS_BI algorithm reduces the searching range based on the mathematical model and employs the bisection method to find the optimal phases. The simulation is shown to validate the proposed GSS_BI algorithm. It is found that the proposed method can reduce 89% of the number of iterations that is used by the conventional method when the number of transmitting antennas is 46.
{"title":"A Fast-Speed Phase Adaptation Algorithm Based on Power Feedback for Microwave Power Transmission","authors":"Doumin Zhou, Ke-feng Jin, Weiyang Zhou, Shuchen Cheng","doi":"10.1109/APEC43580.2023.10131560","DOIUrl":"https://doi.org/10.1109/APEC43580.2023.10131560","url":null,"abstract":"The microwave power transmission system (MPT) is one of the most promising technologies in the long-range wireless power transfer field. However, the transmission efficiency limits the performance of MPT, which can be improved by adapting the phase of each transmitting antenna to increase the amount of constructive interference at the receiver. It is challenging to achieve the stability and fast convergence of the phase algorithm due to a large number of the transmitting antennas. In this paper, a rapid phase adaptation algorithm based on the golden section and bisection method (GSS_BI) is proposed. In the proposed method, the mathematical model between the phase of the transmitters and the power of the receiver is established, which plays a significant role in designing the phase adaptation algorithm. Then the GSS_BI algorithm reduces the searching range based on the mathematical model and employs the bisection method to find the optimal phases. The simulation is shown to validate the proposed GSS_BI algorithm. It is found that the proposed method can reduce 89% of the number of iterations that is used by the conventional method when the number of transmitting antennas is 46.","PeriodicalId":151216,"journal":{"name":"2023 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116575661","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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