Pub Date : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579066
Jun-Ho Kim, Moonsoo Kim, C. Yeon, G. Moon
This paper proposes the size reduction methods for two-stage Boost-LLC converter to achieve high power density in 60W AC-DC adapter. The two-stage converter has high component count, and the passive components such as inductor, transformer, and capacitor occupy the most of the area. In order to make the converter have small size, this paper proposes the size reduction methods of passive components: the design of low link voltage, the design of the resonant tank without additional inductor and with high resonant frequency, and the design of C-L-C filter replacing output capacitor. A 60W (16.8V/3.65A) prototype adapter is designed and implemented to verify the feasibility of the proposed methods. The converter achieves 14.5W/in3 power density with the methods.
{"title":"Analysis and design of Boost-LLC converter for high power density AC-DC adapter","authors":"Jun-Ho Kim, Moonsoo Kim, C. Yeon, G. Moon","doi":"10.1109/ECCE-ASIA.2013.6579066","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579066","url":null,"abstract":"This paper proposes the size reduction methods for two-stage Boost-LLC converter to achieve high power density in 60W AC-DC adapter. The two-stage converter has high component count, and the passive components such as inductor, transformer, and capacitor occupy the most of the area. In order to make the converter have small size, this paper proposes the size reduction methods of passive components: the design of low link voltage, the design of the resonant tank without additional inductor and with high resonant frequency, and the design of C-L-C filter replacing output capacitor. A 60W (16.8V/3.65A) prototype adapter is designed and implemented to verify the feasibility of the proposed methods. The converter achieves 14.5W/in3 power density with the methods.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116609313","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579170
Ling Qin, Shaojun Xie, Chen Yang, Jiankun Cao
To provide academic support for studying the stability of photovoltaic generation systems, the dynamic model and dynamic characteristics (especially the small-signal output impedance) of solar cell are explored further in this paper. Based on the physical model of silicon solar cell, the analytical expressions of steady-state characteristics and the dynamic characteristics are deduced at first; then the dynamics circuit model of solar cell considering the cabling impedance is obtained; after that, the exact expressions of dynamic resistance, equivalent capacitor and small-signal output impedance are derived. Finally, the correctness of theory analysis are validated by simulations and dynamic experiments performed on the platform built with light-emitting diodes (LEDs) and electric double layer capacitor (EDLC).
{"title":"Dynamic model and dynamic characteristics of solar cell","authors":"Ling Qin, Shaojun Xie, Chen Yang, Jiankun Cao","doi":"10.1109/ECCE-ASIA.2013.6579170","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579170","url":null,"abstract":"To provide academic support for studying the stability of photovoltaic generation systems, the dynamic model and dynamic characteristics (especially the small-signal output impedance) of solar cell are explored further in this paper. Based on the physical model of silicon solar cell, the analytical expressions of steady-state characteristics and the dynamic characteristics are deduced at first; then the dynamics circuit model of solar cell considering the cabling impedance is obtained; after that, the exact expressions of dynamic resistance, equivalent capacitor and small-signal output impedance are derived. Finally, the correctness of theory analysis are validated by simulations and dynamic experiments performed on the platform built with light-emitting diodes (LEDs) and electric double layer capacitor (EDLC).","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117107847","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579236
Y. Kawamura, M. Shoyama
In recent years, research on wireless power transmission technologies has been attracting more attention after MIT introduced the magnetic resonance technology in 2007. Wireless power transmission technology enables flexible comfortable supplying energy needs to electric devices. However, the wireless power transmission technologies that use the magnetic field resonance method have various problems. This method has been uniformly investigated from different directions. Therefore, it is difficult to understand the principle for such new technology phenomenon. Much of the research is often focused on the efficiency between resonators. Moreover, the relationship between the internal resistance and efficiency is not clear. Furthermore, the efficiency at high output power is not well understood. Practically, adding an internal resistance as an equivalent of both of rectifier and inverter losses is important for efficiency calculations. Even if the wireless power transmission has high efficiency, it is not suitable for practical use if the output power rating is very small. In this study, at first, the drawbacks of using the electromagnetic induction method for wireless power transmission are described in detail. Then, we indicate that we can increase the transmission power in accordance to the principles of the LC cancellation by using the resonance phenomenon even at a small coupling coefficient. After that, the difference between the overall efficiency considered of entire system and the transmission efficiency between the resonators is clearly distinguished. Then a theoretical formula has been developed for the overall efficiency and the output power in terms of the characteristic impedance. Finally, the theoretical results are compared with the experimental results and discusses in detail.
{"title":"Wireless power transmission using LC cancellation","authors":"Y. Kawamura, M. Shoyama","doi":"10.1109/ECCE-ASIA.2013.6579236","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579236","url":null,"abstract":"In recent years, research on wireless power transmission technologies has been attracting more attention after MIT introduced the magnetic resonance technology in 2007. Wireless power transmission technology enables flexible comfortable supplying energy needs to electric devices. However, the wireless power transmission technologies that use the magnetic field resonance method have various problems. This method has been uniformly investigated from different directions. Therefore, it is difficult to understand the principle for such new technology phenomenon. Much of the research is often focused on the efficiency between resonators. Moreover, the relationship between the internal resistance and efficiency is not clear. Furthermore, the efficiency at high output power is not well understood. Practically, adding an internal resistance as an equivalent of both of rectifier and inverter losses is important for efficiency calculations. Even if the wireless power transmission has high efficiency, it is not suitable for practical use if the output power rating is very small. In this study, at first, the drawbacks of using the electromagnetic induction method for wireless power transmission are described in detail. Then, we indicate that we can increase the transmission power in accordance to the principles of the LC cancellation by using the resonance phenomenon even at a small coupling coefficient. After that, the difference between the overall efficiency considered of entire system and the transmission efficiency between the resonators is clearly distinguished. Then a theoretical formula has been developed for the overall efficiency and the output power in terms of the characteristic impedance. Finally, the theoretical results are compared with the experimental results and discusses in detail.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"30 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129630461","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579254
Jinming Xu, Shaojun Xie
The under-damped resonance phenomenon in grid-tied LCL-filtered inverters yields much difficulty in designing the controller. By adding one or more state feedback, the multi-variable feedback control methods are commonly used. However, the revealed studies are quite limited and cannot explain the essential mechanism of the multi-variable feedback control. In this paper, a systematic analysis method based on zero-placement is provided to detail the control mechanism of one family of multivariable feedback strategy. Through a combination of the easily-measured current and voltage states in LCL filters, a novel state variable of which the zeros can be assigned is produced. By assigning the zeros to cancel the resonance poles, the close-loop control based on the feedback of this novel state variable is easily designed and is capable of satisfactory dynamic. In summary, with the systematic analysis, a family of multi-variable feedback methods is deduced.
{"title":"Current control based on zero-placement strategy for grid-connected LCL-filtered inverters","authors":"Jinming Xu, Shaojun Xie","doi":"10.1109/ECCE-ASIA.2013.6579254","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579254","url":null,"abstract":"The under-damped resonance phenomenon in grid-tied LCL-filtered inverters yields much difficulty in designing the controller. By adding one or more state feedback, the multi-variable feedback control methods are commonly used. However, the revealed studies are quite limited and cannot explain the essential mechanism of the multi-variable feedback control. In this paper, a systematic analysis method based on zero-placement is provided to detail the control mechanism of one family of multivariable feedback strategy. Through a combination of the easily-measured current and voltage states in LCL filters, a novel state variable of which the zeros can be assigned is produced. By assigning the zeros to cancel the resonance poles, the close-loop control based on the feedback of this novel state variable is easily designed and is capable of satisfactory dynamic. In summary, with the systematic analysis, a family of multi-variable feedback methods is deduced.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129748462","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579169
Zegang Xu, Shaojun Xie, Jiankun Cao
Flux-switching hybrid excitation machine is an interesting brushless machine with magnets and excitation windings in the stator. In order to provide an analytical technique for the flux-switching hybrid excitation machine (FSHM) design, a nonlinear magnetic circuit method (NMCM) of maximum phase flux-linkage position was proposed. With equivalent magnetic circuit model as original version, NMCM adopts the subdivision technology of magnetic circuit and iterative solutions methods, taking magnetic saturation into account. The ampere-turns of electric excitation, the recommended value of initial magnetic bridge flux density, and the influence of stator yoke thickness on magnet dimensions and field regulating coefficient were also investigated. Finally, the finite element analysis and the experimental results are presented. The proposed method provides reference for the assignment for electric excitation and permanent magnet excitation, and the field regulating coefficient.
{"title":"Design of flux-switching hybrid excitation machine with bypass-bridges","authors":"Zegang Xu, Shaojun Xie, Jiankun Cao","doi":"10.1109/ECCE-ASIA.2013.6579169","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579169","url":null,"abstract":"Flux-switching hybrid excitation machine is an interesting brushless machine with magnets and excitation windings in the stator. In order to provide an analytical technique for the flux-switching hybrid excitation machine (FSHM) design, a nonlinear magnetic circuit method (NMCM) of maximum phase flux-linkage position was proposed. With equivalent magnetic circuit model as original version, NMCM adopts the subdivision technology of magnetic circuit and iterative solutions methods, taking magnetic saturation into account. The ampere-turns of electric excitation, the recommended value of initial magnetic bridge flux density, and the influence of stator yoke thickness on magnet dimensions and field regulating coefficient were also investigated. Finally, the finite element analysis and the experimental results are presented. The proposed method provides reference for the assignment for electric excitation and permanent magnet excitation, and the field regulating coefficient.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121297069","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579179
SeungWoon Lee, Je-Hyun Yi, Woosup Kim, B. Cho
A new half bridge converter with parallel-series connected four-transformer is proposed for an electric vehicle charger with wide range zero voltage switching operation. The proposed converter combines two sets of two-transformer half bridge converter as a parallel-series connection to accommodate an auxiliary battery charger in an automotive application. The circuit configuration and principles of operation are analyzed in detail and design equations are presented. To verify advantages of the proposed converter, 1.2 kW hardware prototype is built.
{"title":"A parallel-series connected four-transformer half bridge DC-DC converter for electric vehicle application","authors":"SeungWoon Lee, Je-Hyun Yi, Woosup Kim, B. Cho","doi":"10.1109/ECCE-ASIA.2013.6579179","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579179","url":null,"abstract":"A new half bridge converter with parallel-series connected four-transformer is proposed for an electric vehicle charger with wide range zero voltage switching operation. The proposed converter combines two sets of two-transformer half bridge converter as a parallel-series connection to accommodate an auxiliary battery charger in an automotive application. The circuit configuration and principles of operation are analyzed in detail and design equations are presented. To verify advantages of the proposed converter, 1.2 kW hardware prototype is built.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121470060","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579157
Jiefeng Hu, Jianguo Zhu, Y. Qu, J. Guerrero
Voltage and frequency droop method is commonly used in microgrids to achieve proper autonomous power sharing without control wire interconnections. This paper proposes a new control strategy for parallel connected inverters in microgrid applications by drooping the flux instead of the inverter output voltage. Firstly, the relation between the inverter flux and the active and reactive powers is mathematically obtained. Secondly, a novel flux droop method is then developed in order to regulate active and reactive powers by drooping the flux amplitude and the phase angle, respectively. In addition, a small-signal model is developed in order to design the main control parameters and study the system dynamics and stability. The proposed control scheme includes a direct flux control (DFC) algorithm, which avoids the use of PI controllers and PWM modulators. The obtained results shows that the proposed flux droop strategy can achieve active and reactive power sharing with much lower frequency deviation and better transient performance than the conventional voltage droop method, thus highlighting the potential use in microgrid applications.
{"title":"A new virtual-flux-vector based droop control strategy for parallel connected inverters in microgrids","authors":"Jiefeng Hu, Jianguo Zhu, Y. Qu, J. Guerrero","doi":"10.1109/ECCE-ASIA.2013.6579157","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579157","url":null,"abstract":"Voltage and frequency droop method is commonly used in microgrids to achieve proper autonomous power sharing without control wire interconnections. This paper proposes a new control strategy for parallel connected inverters in microgrid applications by drooping the flux instead of the inverter output voltage. Firstly, the relation between the inverter flux and the active and reactive powers is mathematically obtained. Secondly, a novel flux droop method is then developed in order to regulate active and reactive powers by drooping the flux amplitude and the phase angle, respectively. In addition, a small-signal model is developed in order to design the main control parameters and study the system dynamics and stability. The proposed control scheme includes a direct flux control (DFC) algorithm, which avoids the use of PI controllers and PWM modulators. The obtained results shows that the proposed flux droop strategy can achieve active and reactive power sharing with much lower frequency deviation and better transient performance than the conventional voltage droop method, thus highlighting the potential use in microgrid applications.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114809009","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579205
Daiki Satou, N. Hoshi, J. Haruna
When using lithium-ion batteries or electric double-layer capacitors (EDLCs) as a storage module for electric vehicles, the cells of those storage devices are often connected in series. When a number of cells of the storage devices are connected in series, the cell voltage imbalance occurs by individual specificity such as the capacity, the rate of self-discharge, internal impedance, and temperature. In the state of the cell voltage imbalance, the amount of available electrical energy of total cells is decreased. Therefore, cell voltage equalization circuit is essential in order to derive maximum performance of lithium-ion battery or EDLC. This paper proposed the novel cell voltage equalization circuit for battery and EDLC. The proposed circuit not uses resistors; thus, the efficiency of the cell voltage equalizing operation can be improved. In addition, only one inductor and sensor are used in this circuit. Therefore, the cost of circuit can be reduced. Moreover, it can limit the current value of each battery cell in the voltage equalizing operation by use of only one current sensor. This paper explained the operation scheme, and conducted the characteristics comparison with the conventional circuits. Moreover, the effectiveness of this circuit was examined in simulation and experiment. The experiment was conducted using the three and eight EDLC cells (1.5F); and each cell voltage was equalized within finite time. In addition, the standard deviation of each cell voltage was reduced to a sufficient low value below 10mV after finite time. Therefore, the each cell was equalized in sufficient i.e. the effectiveness of the proposed circuit was shown.
{"title":"Consideration about novel cell voltage equalization circuit for battery / EDLC","authors":"Daiki Satou, N. Hoshi, J. Haruna","doi":"10.1109/ECCE-ASIA.2013.6579205","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579205","url":null,"abstract":"When using lithium-ion batteries or electric double-layer capacitors (EDLCs) as a storage module for electric vehicles, the cells of those storage devices are often connected in series. When a number of cells of the storage devices are connected in series, the cell voltage imbalance occurs by individual specificity such as the capacity, the rate of self-discharge, internal impedance, and temperature. In the state of the cell voltage imbalance, the amount of available electrical energy of total cells is decreased. Therefore, cell voltage equalization circuit is essential in order to derive maximum performance of lithium-ion battery or EDLC. This paper proposed the novel cell voltage equalization circuit for battery and EDLC. The proposed circuit not uses resistors; thus, the efficiency of the cell voltage equalizing operation can be improved. In addition, only one inductor and sensor are used in this circuit. Therefore, the cost of circuit can be reduced. Moreover, it can limit the current value of each battery cell in the voltage equalizing operation by use of only one current sensor. This paper explained the operation scheme, and conducted the characteristics comparison with the conventional circuits. Moreover, the effectiveness of this circuit was examined in simulation and experiment. The experiment was conducted using the three and eight EDLC cells (1.5F); and each cell voltage was equalized within finite time. In addition, the standard deviation of each cell voltage was reduced to a sufficient low value below 10mV after finite time. Therefore, the each cell was equalized in sufficient i.e. the effectiveness of the proposed circuit was shown.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125698033","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579283
G. Adam, I. Abdelsalam, S. Finney, D. Holliday, B. Williams, J. Fletcher
This paper summarises an investigation into two modulation strategies that enable a hybrid cascaded multilevel converter to reduce on-state losses and extend the modulation index linear range independent of load power factor, and without capacitor voltage balancing problems. The first modulation strategy exploits unconventional triplen harmonics in combination with a hybrid modulation strategy to optimally reduce the number H-bridge cells required to minimize semiconductor losses, and improve capacitor voltage balancing of the H-bridge cells. The second modulation strategy is based on level-shifted multilevel carriers and exploits 3rd harmonic subtraction to modify the modulating signals in order to extend the regions around zero voltage crossing where cell capacitor voltage balancing can be achieved, with a minimum number of cells. It is shown that both modulation strategies overcome the traditional limitations of hybrid cascaded converter such as dependency of the capacitor voltage balancing on modulation index and load power factor. Also they extend the modulation linear range virtually up to 1.27 in real power applications. Simulation and experimental results at several operating points are used to substantiate the strategies presented in this paper.
{"title":"Comparison of two advanced modulation strategies for a hybrid cascaded converter","authors":"G. Adam, I. Abdelsalam, S. Finney, D. Holliday, B. Williams, J. Fletcher","doi":"10.1109/ECCE-ASIA.2013.6579283","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579283","url":null,"abstract":"This paper summarises an investigation into two modulation strategies that enable a hybrid cascaded multilevel converter to reduce on-state losses and extend the modulation index linear range independent of load power factor, and without capacitor voltage balancing problems. The first modulation strategy exploits unconventional triplen harmonics in combination with a hybrid modulation strategy to optimally reduce the number H-bridge cells required to minimize semiconductor losses, and improve capacitor voltage balancing of the H-bridge cells. The second modulation strategy is based on level-shifted multilevel carriers and exploits 3rd harmonic subtraction to modify the modulating signals in order to extend the regions around zero voltage crossing where cell capacitor voltage balancing can be achieved, with a minimum number of cells. It is shown that both modulation strategies overcome the traditional limitations of hybrid cascaded converter such as dependency of the capacitor voltage balancing on modulation index and load power factor. Also they extend the modulation linear range virtually up to 1.27 in real power applications. Simulation and experimental results at several operating points are used to substantiate the strategies presented in this paper.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121725568","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 : 2013-06-03DOI: 10.1109/ECCE-ASIA.2013.6579249
K. Kostov, J. Rąbkowski, H. Nee
In comparison to their Silicon (Si) counterparts, the Silicon Carbide (SiC) power transistors have lower on-state resistance and higher switching speed, power and temperature ratings. These advantages make it possible to build smaller, lighter and more efficient power converters. Unfortunately, all these benefits come at the price of higher conducted and radiated electromagnetic interference (EMI). This paper investigates the conducted disturbances from a 6 kW boost converter with SiC bipolar junction transistors (BJTs). The results show that the conducted emissions at the input of the converter are approximately proportional to the output voltage, but almost independent on the load current. The effect of the heatsink on the conducted EMI was studied as well. It was found that using separate heatsinks for the diode and the BJT did not affect the level of conducted emissions significantly, but the way of connecting the heatsink does. A floating heatsink is bad from an EMI point of view, and in many cases it may not be allowed for safety reasons. When the heatsink is grounded, alone or together with the negative terminal, the common-mode noise increases the EMI measured at the positive line and decreases the EMI on the negative line. However, this appears only in the lower frequency range. At higher frequencies, connecting the heatsink in any way is better than letting it float. Therefore, the best option is to connect the heatsink to the negative line of the boost converter, and if grounding is required, it may be grounded as well. This may not be possible in systems where the negative voltage bus is at non-zero potential.
{"title":"Conducted EMI from SiC BJT boost converter and its dependence on the output voltage, current, and heatsink connection","authors":"K. Kostov, J. Rąbkowski, H. Nee","doi":"10.1109/ECCE-ASIA.2013.6579249","DOIUrl":"https://doi.org/10.1109/ECCE-ASIA.2013.6579249","url":null,"abstract":"In comparison to their Silicon (Si) counterparts, the Silicon Carbide (SiC) power transistors have lower on-state resistance and higher switching speed, power and temperature ratings. These advantages make it possible to build smaller, lighter and more efficient power converters. Unfortunately, all these benefits come at the price of higher conducted and radiated electromagnetic interference (EMI). This paper investigates the conducted disturbances from a 6 kW boost converter with SiC bipolar junction transistors (BJTs). The results show that the conducted emissions at the input of the converter are approximately proportional to the output voltage, but almost independent on the load current. The effect of the heatsink on the conducted EMI was studied as well. It was found that using separate heatsinks for the diode and the BJT did not affect the level of conducted emissions significantly, but the way of connecting the heatsink does. A floating heatsink is bad from an EMI point of view, and in many cases it may not be allowed for safety reasons. When the heatsink is grounded, alone or together with the negative terminal, the common-mode noise increases the EMI measured at the positive line and decreases the EMI on the negative line. However, this appears only in the lower frequency range. At higher frequencies, connecting the heatsink in any way is better than letting it float. Therefore, the best option is to connect the heatsink to the negative line of the boost converter, and if grounding is required, it may be grounded as well. This may not be possible in systems where the negative voltage bus is at non-zero potential.","PeriodicalId":301487,"journal":{"name":"2013 IEEE ECCE Asia Downunder","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130434290","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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