Pub Date : 2020-08-18DOI: 10.18618/rep.2020.3.0017
José A. O. Filho, H. Paredes, J. Bonaldo, A. Alonso, F. Marafão, Marcelo Simoes
– Considering the application of multifunctional grid-tied inverters in modern microgrids, this paper proposes a novel control strategy derived from the Conservative Power Theory (CPT), which makes possible the compensation of instantaneous power oscillations. Such approach is based on the instantaneous power and instantaneous reactive energy terms defined by the CPT, allowing the extraction of oscillating power components directly in the abc frame. Simulation results are presented to demonstrate the applicability of the control strategy considering the scenario of a weak microgrid with linear, non-linear, and unbalanced loads, as well as comprising a three-phase multi-functional grid-tied inverter with LCL filter. The results show that active power dispatchability can be offered by the inverter, while concomitantly supporting the microgrid to operate at constant instantaneous power. Experimental results comprising a 3.6 kVA inverter prototype also validate the proposed decomposition of oscillating power terms, showing that they can be satisfactorily employed on compensation purposes.
{"title":"COMPENSATION OF OSCILLATING INSTANTANEOUS POWER IN MODERN MICROGRIDS BASED ON THE CONSERVATIVE POWER THEORY","authors":"José A. O. Filho, H. Paredes, J. Bonaldo, A. Alonso, F. Marafão, Marcelo Simoes","doi":"10.18618/rep.2020.3.0017","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0017","url":null,"abstract":"– Considering the application of multifunctional grid-tied inverters in modern microgrids, this paper proposes a novel control strategy derived from the Conservative Power Theory (CPT), which makes possible the compensation of instantaneous power oscillations. Such approach is based on the instantaneous power and instantaneous reactive energy terms defined by the CPT, allowing the extraction of oscillating power components directly in the abc frame. Simulation results are presented to demonstrate the applicability of the control strategy considering the scenario of a weak microgrid with linear, non-linear, and unbalanced loads, as well as comprising a three-phase multi-functional grid-tied inverter with LCL filter. The results show that active power dispatchability can be offered by the inverter, while concomitantly supporting the microgrid to operate at constant instantaneous power. Experimental results comprising a 3.6 kVA inverter prototype also validate the proposed decomposition of oscillating power terms, showing that they can be satisfactorily employed on compensation purposes.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125217361","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 : 2020-08-11DOI: 10.18618/rep.2020.3.0024
Rodrigo Paz França, F. H. Dupont, J. R. Pinheiro
This study presented a case study-validated methodology of stability analysis with the association of two methods for the application in interconnected DCDC converters. The combination of the Middlebrook and Nyquist criteria for the stability analysis made it possible to detect non-modeled dynamics when subsystems were coupled, which were identified through the Extra Element Theorem (TEE). In addition, it was demonstrated how the parametric variation affected the stability of the interconnected system, emphasizing the influence that the load values and the parameters of the input filter exercises on this condition. Finally, experimental results were obtained in order to validate the aforementioned analyzes. As a conclusion, the association of Middlebrook and Nyquist stability analysis methods was essential to identify Manuscript received 04/20/2020; first revision 06/25/2020; accepted for publication 07/29/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. “http://dx.doi.org/10.18618/REP.2020.3.0024” more precisely the origin of the stability problem in the cascade system. In addition, it was understood that the control solution employed in the subsystems must consider the non-modeled dynamics to guarantee the stability of the hole interconnected system.
本研究提出了一种实例验证的稳定性分析方法，并将两种方法相结合，用于互连型直流直流变流器。结合Middlebrook和Nyquist标准进行稳定性分析，使得检测子系统耦合时的非建模动力学成为可能，这是通过额外元素定理(TEE)识别的。此外，还演示了参数变化如何影响互联系统的稳定性，强调了负载值和输入滤波器参数在这种情况下的影响。最后，通过实验验证了上述分析的正确性。综上所述，Middlebrook和Nyquist稳定性分析方法的结合对于鉴定04/20/2020稿件至关重要;第一版06/25/2020;经编辑Demercil de Souza Oliveira Jr.“http://dx.doi.org/10.18618/REP.2020.3.0024”的建议，接受于2020年7月29日出版，更准确地说明了级联系统中稳定性问题的起源。此外，了解到子系统所采用的控制方案必须考虑非建模动力学，以保证孔互联系统的稳定性。
{"title":"ORIGIN OF THE STABILITY PROBLEM OF DC-DC CONVERTERS CASCADE CONNECTED","authors":"Rodrigo Paz França, F. H. Dupont, J. R. Pinheiro","doi":"10.18618/rep.2020.3.0024","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0024","url":null,"abstract":"This study presented a case study-validated methodology of stability analysis with the association of two methods for the application in interconnected DCDC converters. The combination of the Middlebrook and Nyquist criteria for the stability analysis made it possible to detect non-modeled dynamics when subsystems were coupled, which were identified through the Extra Element Theorem (TEE). In addition, it was demonstrated how the parametric variation affected the stability of the interconnected system, emphasizing the influence that the load values and the parameters of the input filter exercises on this condition. Finally, experimental results were obtained in order to validate the aforementioned analyzes. As a conclusion, the association of Middlebrook and Nyquist stability analysis methods was essential to identify Manuscript received 04/20/2020; first revision 06/25/2020; accepted for publication 07/29/2020, by recommendation of Editor Demercil de Souza Oliveira Jr. “http://dx.doi.org/10.18618/REP.2020.3.0024” more precisely the origin of the stability problem in the cascade system. In addition, it was understood that the control solution employed in the subsystems must consider the non-modeled dynamics to guarantee the stability of the hole interconnected system.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130582499","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 : 2020-08-09DOI: 10.18618/rep.2020.3.0039
P. Evald, R. Tambara, H. Grundling
– In this work is presented the design of a direct discrete-time reduced order RMRAC (Robust Model Reference Adaptive Control) applied to the grid-side current control of a static grid-tied voltage-fed 3-wire converter with LCL filter. The proposed controller tracks the reference model output as close as a higher order RMRAC, with similar performance. Furthermore, it rejects exogenous disturbances from grid without the need of conventional resonant controllers, often employed in this kind of application. To design the reduced order controller, the LCL filter is approximated to a first order transfer function, neglecting the capacitor influence. Besides, it is shown mathematically that capacitor is the main element that compounds the additive dynamics, which is considered as unmodelled dynamics to design the controller. Furthermore, experimental results performed in a TMS320F28335 Delfino microcontroller are presented and show the similarity of performance between proposed control method and higher order RMRAC, regarding to harmonics content, which indicate its feasibility.
{"title":"A DIRECT DISCRETE-TIME REDUCED ORDER ROBUST MODEL REFERENCE ADAPTIVE CONTROL FOR GRID-TIED POWER CONVERTERS WITH LCL FILTER","authors":"P. Evald, R. Tambara, H. Grundling","doi":"10.18618/rep.2020.3.0039","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0039","url":null,"abstract":"– In this work is presented the design of a direct discrete-time reduced order RMRAC (Robust Model Reference Adaptive Control) applied to the grid-side current control of a static grid-tied voltage-fed 3-wire converter with LCL filter. The proposed controller tracks the reference model output as close as a higher order RMRAC, with similar performance. Furthermore, it rejects exogenous disturbances from grid without the need of conventional resonant controllers, often employed in this kind of application. To design the reduced order controller, the LCL filter is approximated to a first order transfer function, neglecting the capacitor influence. Besides, it is shown mathematically that capacitor is the main element that compounds the additive dynamics, which is considered as unmodelled dynamics to design the controller. Furthermore, experimental results performed in a TMS320F28335 Delfino microcontroller are presented and show the similarity of performance between proposed control method and higher order RMRAC, regarding to harmonics content, which indicate its feasibility.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114687284","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 : 2020-08-04DOI: 10.18618/rep.2020.3.0007
Robson Mayer, Menaouar Berrehil El Kattel, S. Oliveira
– This paper presents a theoretical analysis and the experimental results of the bidirectional coupled inductor dc-dc converter for dc-bus voltage regulation and power compensation in dc-microgrid applications. In dc-microgrids, a power distribution system requires a bidirectional converter to control the power flow between dc-bus and batteries. Furthermore, the dc-bus needs to be kept stabilized within certain limits and the converter handles a large range of voltage variation in the accumulators. The proposed topology is also relatively feasible for low-input-voltage applications for interfacing energy storage elements, such as batteries, ultracapacitors with the high voltage dc-bus in electric vehicles. The converter allows greater voltage gain compared to classic non-isolated topologies and can better deal with the wide range of voltage variation imposed by the source/load. The operation principles, the DC voltage gain, the design of the filters, the voltage/current stresses and a comparison are discussed. The experimental results confirmed and validated the theoretical study as well as the converter performance so that the measurements performed obtained from a 600 W laboratory prototype.
{"title":"BIDIRECTIONAL DC-DC CONVERTER WITH COUPLED INDUCTOR FOR DC-BUS REGULATION IN MICROGRID APPLICATIONS","authors":"Robson Mayer, Menaouar Berrehil El Kattel, S. Oliveira","doi":"10.18618/rep.2020.3.0007","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0007","url":null,"abstract":"– This paper presents a theoretical analysis and the experimental results of the bidirectional coupled inductor dc-dc converter for dc-bus voltage regulation and power compensation in dc-microgrid applications. In dc-microgrids, a power distribution system requires a bidirectional converter to control the power flow between dc-bus and batteries. Furthermore, the dc-bus needs to be kept stabilized within certain limits and the converter handles a large range of voltage variation in the accumulators. The proposed topology is also relatively feasible for low-input-voltage applications for interfacing energy storage elements, such as batteries, ultracapacitors with the high voltage dc-bus in electric vehicles. The converter allows greater voltage gain compared to classic non-isolated topologies and can better deal with the wide range of voltage variation imposed by the source/load. The operation principles, the DC voltage gain, the design of the filters, the voltage/current stresses and a comparison are discussed. The experimental results confirmed and validated the theoretical study as well as the converter performance so that the measurements performed obtained from a 600 W laboratory prototype.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126955738","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 : 2020-08-04DOI: 10.18618/rep.2020.3.0010
W. J. Paula, G. M. Tavares, G. M. Soares, P. S. Almeida, H. Braga
– This work presents an improved analytical model concerning the prediction of switching losses in power MOSFETs by considering the influence of parasitic elements in the high-frequency operation of devices. By using the transistor voltage and current waveforms, it is possible to predict switching losses under hard-switching conditions adopting only parameters that can be obtained from the device datasheet. The method employs the nonlinearities associated with the junction capacitances, which are incorporated into the model through curve fitting. Besides, the sensitivity analysis is used to identify which parameters have a major influence on the estimated losses. The methodology is described in details and verified by means of experimental results concerning a SiC MOSFET, which is tested under various current and voltage conditions.
{"title":"AN IMPROVED METHODOLOGY FOR SWITCHING LOSSES ESTIMATION IN SiC MOSFETs","authors":"W. J. Paula, G. M. Tavares, G. M. Soares, P. S. Almeida, H. Braga","doi":"10.18618/rep.2020.3.0010","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0010","url":null,"abstract":"– This work presents an improved analytical model concerning the prediction of switching losses in power MOSFETs by considering the influence of parasitic elements in the high-frequency operation of devices. By using the transistor voltage and current waveforms, it is possible to predict switching losses under hard-switching conditions adopting only parameters that can be obtained from the device datasheet. The method employs the nonlinearities associated with the junction capacitances, which are incorporated into the model through curve fitting. Besides, the sensitivity analysis is used to identify which parameters have a major influence on the estimated losses. The methodology is described in details and verified by means of experimental results concerning a SiC MOSFET, which is tested under various current and voltage conditions.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117301905","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 : 2020-08-04DOI: 10.18618/rep.2020.3.0016
J. Fraytag, A. Kirsten, M. Heldwein
– Due to the current importance of Dual-Active-Bridge (DAB) converters, this work proposes an analysis framework to model the DAB static behavior when it is subjected to a multi-variables modulation. In this type of modulation, in addition to the angular-phase-shift between the DAB H-bridges, the primary and secondary-side voltage duty-cycles can also be varied. The current analysis proposes tools to define the most suitable operation point for a DAB converter, analyzing the impact of choosing the operational point on the magnetic core volume, copper losses and soft-switching for primary-an secondary-side. Experimental results for a 800 W, 1200 W and 1600 W prototype are presented to validate the proposed analyzes, where a core volume variation of 35% was obtained.
{"title":"IMPACTS OF THE MULTI-VARIABLES MODULATION ON TRANSFORMER AND SOFT-SWITCHING OF A DUAL-ACTIVE-BRIDGE","authors":"J. Fraytag, A. Kirsten, M. Heldwein","doi":"10.18618/rep.2020.3.0016","DOIUrl":"https://doi.org/10.18618/rep.2020.3.0016","url":null,"abstract":"– Due to the current importance of Dual-Active-Bridge (DAB) converters, this work proposes an analysis framework to model the DAB static behavior when it is subjected to a multi-variables modulation. In this type of modulation, in addition to the angular-phase-shift between the DAB H-bridges, the primary and secondary-side voltage duty-cycles can also be varied. The current analysis proposes tools to define the most suitable operation point for a DAB converter, analyzing the impact of choosing the operational point on the magnetic core volume, copper losses and soft-switching for primary-an secondary-side. Experimental results for a 800 W, 1200 W and 1600 W prototype are presented to validate the proposed analyzes, where a core volume variation of 35% was obtained.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127876636","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 : 2020-05-29DOI: 10.18618/rep.2020.2.0012
Lucas Koleff, Lucas Araújo, Mário Zambon, W. Komatsu, E. Pellini, Lourenco Matakas Junior
The objective of this article is to present a flexible didactic platform for thyristor-based circuits. When compared to the existing academic and commercial teaching platforms the proposed one is modular and shows more flexibility. Using the same basic thyristor module, several topologies can be built, including solid-state relays, thyristor bridge rectifiers, and others. All development steps are detailed. Examples of teaching applications, such as the operation of a controlled rectifier, are presented to demonstrate the functionality and didactic usage. Experimental results are also included for the presented applications.
{"title":"A FLEXIBLE DIDACTIC PLATFORM FOR THYRISTOR-BASED CIRCUIT TOPOLOGIES","authors":"Lucas Koleff, Lucas Araújo, Mário Zambon, W. Komatsu, E. Pellini, Lourenco Matakas Junior","doi":"10.18618/rep.2020.2.0012","DOIUrl":"https://doi.org/10.18618/rep.2020.2.0012","url":null,"abstract":"The objective of this article is to present a flexible didactic platform for thyristor-based circuits. When compared to the existing academic and commercial teaching platforms the proposed one is modular and shows more flexibility. Using the same basic thyristor module, several topologies can be built, including solid-state relays, thyristor bridge rectifiers, and others. All development steps are detailed. Examples of teaching applications, such as the operation of a controlled rectifier, are presented to demonstrate the functionality and didactic usage. Experimental results are also included for the presented applications.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132662911","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 : 2020-03-31DOI: 10.18618/rep.2020.1.0066
W. A. Venturini, Henrique Jank, M. Martins, L. Lopes, F. Bisogno
de Abstract – This paper proposes a small-signal modeling in synchronous reference frame for hierarchical control structures applied to the parallelism of three-phase UPS where all the control loops are included. It considers the inner current and voltage loops, virtual impedance, droop control and secondary control loops for amplitude and frequency restorations, as well as for active and reactive power equalizations. The presented modeling is developed in the state-space and consists of the linearization around an equilibrium point. The obtained models are validated through simulation results, which correspond precisely to the average values of the analyzed waveforms. Hardware-in-the-loop results confirm the functionality of the proposed modeling in the definition of the hierarchical control structure controllers gains, as well as its performance.
{"title":"STATE-SPACE SMALL-SIGNAL MODELING FOR HIERARCHICAL CONTROL STRUCTURES IN SYNCHRONOUS REFERENCE FRAME APPLIED TO THE PARALLELISM OF THREE-PHASE UPS","authors":"W. A. Venturini, Henrique Jank, M. Martins, L. Lopes, F. Bisogno","doi":"10.18618/rep.2020.1.0066","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0066","url":null,"abstract":"de Abstract – This paper proposes a small-signal modeling in synchronous reference frame for hierarchical control structures applied to the parallelism of three-phase UPS where all the control loops are included. It considers the inner current and voltage loops, virtual impedance, droop control and secondary control loops for amplitude and frequency restorations, as well as for active and reactive power equalizations. The presented modeling is developed in the state-space and consists of the linearization around an equilibrium point. The obtained models are validated through simulation results, which correspond precisely to the average values of the analyzed waveforms. Hardware-in-the-loop results confirm the functionality of the proposed modeling in the definition of the hierarchical control structure controllers gains, as well as its performance.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126267891","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 : 2020-03-31DOI: 10.18618/rep.2020.1.0059
Jean S. Brand, M. Melo, José Marcos Alonso Alvarez, M. Costa
This paper presents the analysis of the lowfrequency ripple transfer from the input voltage to the LEDs current of a DC-DC converter, in the buck, boost and buck-boost topologies operating in discontinuous conduction mode. This analysis fulfills the maximum limits recommended by IEEE Std. 1789-2015 to mitigate the effects of light flicker in humans. The objective is to find the maximum input voltage ripple percent values for a range of operation of each topology, in different LED loads. To do this, the mathematical models for each topology is applied in three LED loads, based on the dimensionless term low-frequency ripple transmission factor, that relates the percent ripple transmitted from Artigo submetido em 09/08/2019. Primeira revisão em 08/10/2019. Aceito para publicação em 24/03/2020 por recomendação do Editor Marcello Mezaroba. http://dx.doi.org/10.18618/REP.2020.1.0059 the input to the output of the stage. With these values, a study is performed to determine the minimum bus capacitance required for each case. The Luxeon 3014 LED is selected for simulations and implementations at three operating points of each topology, in prototypes with a rated power of 20W. The buck-boost topology stands out because it presents a low-frequency ripple transmission factor reduced and constant for the entire operating range.
本文分析了在断续导通模式下工作的降压、升压和降压升压拓扑下，DC-DC变换器从输入电压到led电流的低频纹波传递。该分析符合IEEE标准1789-2015建议的最大限度，以减轻人类的光闪烁影响。目标是在不同的LED负载下，找到每种拓扑的工作范围的最大输入电压纹波百分比值。为此，基于无量纲项低频纹波传输系数，将每个拓扑的数学模型应用于三个LED负载中，该系数与2019年9月8日Artigo submetido传输的百分比纹波有关。Primeira revision o em 08/10/2019。Aceito para public a o em 24/03/2020强烈推荐a o编辑Marcello Mezaroba。http://dx.doi.org/10.18618/REP.2020.1.0059阶段的输入到输出。根据这些值，进行研究以确定每种情况所需的最小总线电容。Luxeon 3014 LED被选择在每个拓扑的三个工作点进行模拟和实现，在额定功率为20W的原型中。buck-boost拓扑突出，因为它在整个工作范围内呈现出低频纹波传输因子减小和恒定。
{"title":"ANALYSIS OF LOW-FREQUENCY RIPPLE TRANSMISSION TO DCM OPERATING CONVERTERS FOR LED DRIVERS","authors":"Jean S. Brand, M. Melo, José Marcos Alonso Alvarez, M. Costa","doi":"10.18618/rep.2020.1.0059","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0059","url":null,"abstract":"This paper presents the analysis of the lowfrequency ripple transfer from the input voltage to the LEDs current of a DC-DC converter, in the buck, boost and buck-boost topologies operating in discontinuous conduction mode. This analysis fulfills the maximum limits recommended by IEEE Std. 1789-2015 to mitigate the effects of light flicker in humans. The objective is to find the maximum input voltage ripple percent values for a range of operation of each topology, in different LED loads. To do this, the mathematical models for each topology is applied in three LED loads, based on the dimensionless term low-frequency ripple transmission factor, that relates the percent ripple transmitted from Artigo submetido em 09/08/2019. Primeira revisão em 08/10/2019. Aceito para publicação em 24/03/2020 por recomendação do Editor Marcello Mezaroba. http://dx.doi.org/10.18618/REP.2020.1.0059 the input to the output of the stage. With these values, a study is performed to determine the minimum bus capacitance required for each case. The Luxeon 3014 LED is selected for simulations and implementations at three operating points of each topology, in prototypes with a rated power of 20W. The buck-boost topology stands out because it presents a low-frequency ripple transmission factor reduced and constant for the entire operating range.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129678232","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 : 2020-03-31DOI: 10.18618/rep.2020.1.0070
Francisco José Viglus, M. Heldwein
This work discusses a multilevel bidirectional converter designed to emulate loss free resistors within a future power cable emulator in a large frequency range. The proposed converter is composed of four TType converter legs, interleaved and connected through two interphase transformers. This structure provides an excellent loss distribution and a nine-level voltage is synthesized on its ac port, where only a compact filter is required. Thus, the proposed topology tends to be compact, highly efficient and presents a fast dynamic response. A GaN-based prototype at a rated power of 400 W switched at 250 kHz is built. Experimental results shows that the proposed converter achieves a peak efficiency of 98.5% at a quarter of the rated load reaching 97.1% at full-power.
{"title":"HIGH PERFORMANCE RESISTANCE EMULATOR BASED ON A BIDIRECTIONAL MULTILEVEL CONVERTER AND GaN DEVICES","authors":"Francisco José Viglus, M. Heldwein","doi":"10.18618/rep.2020.1.0070","DOIUrl":"https://doi.org/10.18618/rep.2020.1.0070","url":null,"abstract":"This work discusses a multilevel bidirectional converter designed to emulate loss free resistors within a future power cable emulator in a large frequency range. The proposed converter is composed of four TType converter legs, interleaved and connected through two interphase transformers. This structure provides an excellent loss distribution and a nine-level voltage is synthesized on its ac port, where only a compact filter is required. Thus, the proposed topology tends to be compact, highly efficient and presents a fast dynamic response. A GaN-based prototype at a rated power of 400 W switched at 250 kHz is built. Experimental results shows that the proposed converter achieves a peak efficiency of 98.5% at a quarter of the rated load reaching 97.1% at full-power.","PeriodicalId":149812,"journal":{"name":"Eletrônica de Potência","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123295103","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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