Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930711
O. Zambetti, M. Colombo, S. D'Angelo, S. Saggini, Roberto Rizzolatti
Growth of electricity consumption for data center increases rapidly as computation continues to move into the cloud computing. Energy management has become a key issue for the next generation of data center. 48V to 12V step-down isolated converters are often required in server, telecom and automotive applications. Using resonant topology such as LLC realizes ZVS turn-on for all switches over the entire load range using magnetizing current and can achieve high level of efficiency [1], [2]. In this paper the control system and application of an Isolated dc-dc resonant converter is proposed for a conversion from 48V to 12V. The controller IC has been implemented in 0.16um lithography together with a DPWM with 195ps resolution and 40Ms/s ADC 7 bits pipeline converter. Experimental results of a 45A, 12V provided to show the effectiveness of the discussed system.
{"title":"48V to 12V isolated resonant converter with digital controller","authors":"O. Zambetti, M. Colombo, S. D'Angelo, S. Saggini, Roberto Rizzolatti","doi":"10.1109/APEC.2017.7930711","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930711","url":null,"abstract":"Growth of electricity consumption for data center increases rapidly as computation continues to move into the cloud computing. Energy management has become a key issue for the next generation of data center. 48V to 12V step-down isolated converters are often required in server, telecom and automotive applications. Using resonant topology such as LLC realizes ZVS turn-on for all switches over the entire load range using magnetizing current and can achieve high level of efficiency [1], [2]. In this paper the control system and application of an Isolated dc-dc resonant converter is proposed for a conversion from 48V to 12V. The controller IC has been implemented in 0.16um lithography together with a DPWM with 195ps resolution and 40Ms/s ADC 7 bits pipeline converter. Experimental results of a 45A, 12V provided to show the effectiveness of the discussed system.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122770883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930681
Yan Zhang, Xinying Li, Z. Dong, Yanfei Liu, Jinjun Liu
The existing high step-up DC-DC converters with multi-cell diode-capacitor network have large inrush current issue and strict LC filter requirement which are not suitable to achieve both high efficiency and high power density in relatively low switching frequency and large power application. In order to meet high step-up voltage regulation and compulsory electrical isolation due to public safety, this paper proposes a single-switch isolated DC-DC converter which exploits the features of multi-winding transformer and diode-capacitor voltage boost cell. The new topology has the following advantages 1). increase voltage boost capability and avoid extreme large duty ratio. 2) achieve almost zero output voltage ripples which reducing the inductance in output LC filter, 3) reduce transformer turns ratio and magnetic component volume. Furthermore, it can use the transformer leakage inductor and auxiliary switch to achieve zero-voltage switching (ZVS), which is beneficial to reduce the switching loss and increase efficiency.
{"title":"High step-up isolated DC-DC converter with multi-cell diode-capacitor network","authors":"Yan Zhang, Xinying Li, Z. Dong, Yanfei Liu, Jinjun Liu","doi":"10.1109/APEC.2017.7930681","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930681","url":null,"abstract":"The existing high step-up DC-DC converters with multi-cell diode-capacitor network have large inrush current issue and strict LC filter requirement which are not suitable to achieve both high efficiency and high power density in relatively low switching frequency and large power application. In order to meet high step-up voltage regulation and compulsory electrical isolation due to public safety, this paper proposes a single-switch isolated DC-DC converter which exploits the features of multi-winding transformer and diode-capacitor voltage boost cell. The new topology has the following advantages 1). increase voltage boost capability and avoid extreme large duty ratio. 2) achieve almost zero output voltage ripples which reducing the inductance in output LC filter, 3) reduce transformer turns ratio and magnetic component volume. Furthermore, it can use the transformer leakage inductor and auxiliary switch to achieve zero-voltage switching (ZVS), which is beneficial to reduce the switching loss and increase efficiency.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"265 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116240396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930707
Y. Jang, M. Jovanovic
A bidirectional buck-boost converter with a new soft-switching active-snubber cell that reduces switching losses is introduced. Soft-switching cell consists of an active snubber switch, a snubber inductor, and a two-winding transformer with associated magnetizing current reset circuit. The soft-switching cells enable the buck and boost rectifier to turn off with a controlled turn-off rate of their current to minimize corresponding reverse-recovery losses. In addition, in the introduced soft-switching cell, the power-controlling buck and boost switches turn on with zero-voltage switching (ZVS) and the snubber switches turn off with zero-current switching (ZCS). The performance of the proposed bidirectional converter was evaluated on a 5-kW prototype exchanging energy between a 400-V bus and a battery with voltage range between 200 V and 300 V. The 100-kHz prototype circuit exhibits the maximum full-load efficiency of 99.1% in the boost-mode and 98.2% in the buck-mode operation.
{"title":"Soft-switched bidirectional buck-boost converters","authors":"Y. Jang, M. Jovanovic","doi":"10.1109/APEC.2017.7930707","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930707","url":null,"abstract":"A bidirectional buck-boost converter with a new soft-switching active-snubber cell that reduces switching losses is introduced. Soft-switching cell consists of an active snubber switch, a snubber inductor, and a two-winding transformer with associated magnetizing current reset circuit. The soft-switching cells enable the buck and boost rectifier to turn off with a controlled turn-off rate of their current to minimize corresponding reverse-recovery losses. In addition, in the introduced soft-switching cell, the power-controlling buck and boost switches turn on with zero-voltage switching (ZVS) and the snubber switches turn off with zero-current switching (ZCS). The performance of the proposed bidirectional converter was evaluated on a 5-kW prototype exchanging energy between a 400-V bus and a battery with voltage range between 200 V and 300 V. The 100-kHz prototype circuit exhibits the maximum full-load efficiency of 99.1% in the boost-mode and 98.2% in the buck-mode operation.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122539119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930676
Usama Anwar, R. Erickson, D. Maksimović, K. Afridi
This paper presents a control architecture that substantially reduces current distortion in bridgeless boost power factor correction (PFC) rectifiers. In the proposed control architecture, the ac line voltage is sensed and the current reference is generated without rectification. This relieves the controller from having to deal with discontinuities around zero-crossing transitions, which eases requirements for the controller bandwidth and reduces distortion. Furthermore, a proportional-integral-squared (PI2) compensator is proposed to mitigate line current phase shift due to an input voltage feed-forward effect, which is particularly pronounced when a small boost inductance is employed. Very low distortion, near-ideal rectifier performance is experimentally verified on a 5 kW bridgeless boost PFC rectifier prototype.
{"title":"A control architecture for low current distortion in bridgeless boost power factor correction rectifiers","authors":"Usama Anwar, R. Erickson, D. Maksimović, K. Afridi","doi":"10.1109/APEC.2017.7930676","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930676","url":null,"abstract":"This paper presents a control architecture that substantially reduces current distortion in bridgeless boost power factor correction (PFC) rectifiers. In the proposed control architecture, the ac line voltage is sensed and the current reference is generated without rectification. This relieves the controller from having to deal with discontinuities around zero-crossing transitions, which eases requirements for the controller bandwidth and reduces distortion. Furthermore, a proportional-integral-squared (PI2) compensator is proposed to mitigate line current phase shift due to an input voltage feed-forward effect, which is particularly pronounced when a small boost inductance is employed. Very low distortion, near-ideal rectifier performance is experimentally verified on a 5 kW bridgeless boost PFC rectifier prototype.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115317773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7931094
K. Potty, Eric Bauer, He Li, Boxue Hu, Jin Wang
Power Electronic converters and electric motor drives have found increased application in automobiles, ships and microgrids. These devices when driving loads in a regulated fashion act as Constant Power Loads (CPLs). CPLs can be power converters, each regulating input current to maintain a constant output power. These converters can cause destabilizing effects on the grid due to their nonlinear behavior. This paper studies the effect of CPLs on DC Microgrids and analyzes their stability. It also demonstrates a method to dynamically stabilize these loads locally by converting them into a smart resistor using high bandwidth power converters and energy storage units. The bandwidth offered by this circuit enables the DC Microgrid to locally control any instabilities on the grid. The proposed method decentralizes the control effort making the microgrid more intelligent and reliable. Analysis is verified using simulation tools and validated using a hardware test setup.
{"title":"Smart resistor: Dynamic stabilization of constant power loads in DC microgrids with high bandwidth power converters and energy storage","authors":"K. Potty, Eric Bauer, He Li, Boxue Hu, Jin Wang","doi":"10.1109/APEC.2017.7931094","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931094","url":null,"abstract":"Power Electronic converters and electric motor drives have found increased application in automobiles, ships and microgrids. These devices when driving loads in a regulated fashion act as Constant Power Loads (CPLs). CPLs can be power converters, each regulating input current to maintain a constant output power. These converters can cause destabilizing effects on the grid due to their nonlinear behavior. This paper studies the effect of CPLs on DC Microgrids and analyzes their stability. It also demonstrates a method to dynamically stabilize these loads locally by converting them into a smart resistor using high bandwidth power converters and energy storage units. The bandwidth offered by this circuit enables the DC Microgrid to locally control any instabilities on the grid. The proposed method decentralizes the control effort making the microgrid more intelligent and reliable. Analysis is verified using simulation tools and validated using a hardware test setup.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134609583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7931213
Y. Kafle, G. Town, G. Xiao, Samir Gautam
Removing the isolation transformer in grid-connected photovoltaic (PV) inverters is desirable to increase efficiency and reduce the size, weight, and cost of these systems. However, it may also allow leakage current through the stray capacitance between the PV array and ground, causing a safety risk. Both efficiency and leakage current depend upon both inverter topology and modulation strategy. In this work three single-phase inverter topologies, i.e. the H-bridge, HERIC, and H5 inverters, are compared with respect to efficiency and leakage current to determine their suitability as transformerless PV inverter systems. Experimental results are presented for the most promising case, i.e. the HERIC inverter with standard sinusoidal pulse-width modulation.
{"title":"Performance comparison of single-phase transformerless PV inverter systems","authors":"Y. Kafle, G. Town, G. Xiao, Samir Gautam","doi":"10.1109/APEC.2017.7931213","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931213","url":null,"abstract":"Removing the isolation transformer in grid-connected photovoltaic (PV) inverters is desirable to increase efficiency and reduce the size, weight, and cost of these systems. However, it may also allow leakage current through the stray capacitance between the PV array and ground, causing a safety risk. Both efficiency and leakage current depend upon both inverter topology and modulation strategy. In this work three single-phase inverter topologies, i.e. the H-bridge, HERIC, and H5 inverters, are compared with respect to efficiency and leakage current to determine their suitability as transformerless PV inverter systems. Experimental results are presented for the most promising case, i.e. the HERIC inverter with standard sinusoidal pulse-width modulation.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131842310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7931079
E. Jones, Zheyu Zhang, Fred Wang
The higher switching speed of wide bandgap devices requires new analysis to interpret voltage waveforms during turn-on and turn-off transients. Although the Miller effect remains a dominant feature, the conventional Miller plateau equations do not accurately model the dvds/dt for fast-switching devices such as GaN FETs. This paper derives equations for instantaneous dvds/dt based on static datasheet parameters, considering the Miller effect and the displacement of junction capacitance charges through the saturated channel. These equations will be verified with experimental results for an enhancement-mode GaN FET across a range of operating conditions. Furthermore, the peak dvds/dt is predicted using the derived equations, and shown to be more accurate than other models when compared to GaN experimental results.
{"title":"Analysis of the dv/dt transient of enhancement-mode GaN FETs","authors":"E. Jones, Zheyu Zhang, Fred Wang","doi":"10.1109/APEC.2017.7931079","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931079","url":null,"abstract":"The higher switching speed of wide bandgap devices requires new analysis to interpret voltage waveforms during turn-on and turn-off transients. Although the Miller effect remains a dominant feature, the conventional Miller plateau equations do not accurately model the dvds/dt for fast-switching devices such as GaN FETs. This paper derives equations for instantaneous dvds/dt based on static datasheet parameters, considering the Miller effect and the displacement of junction capacitance charges through the saturated channel. These equations will be verified with experimental results for an enhancement-mode GaN FET across a range of operating conditions. Furthermore, the peak dvds/dt is predicted using the derived equations, and shown to be more accurate than other models when compared to GaN experimental results.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131889039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930878
Y. Chen, R. Mai, Youyuan Zhang, Yong Li, Zhengyou He
It is of great significance to implement inductive power transfer (IPT) technology to massive Electric bicycles (EBs) charging as it is more convenient and safer than the plug-in systems. However, the cost of IPT systems is too expensive to employ when hundreds of inverters are needed for a parking lot. A novel method to realize constant current (CC) and constant voltage (CV) output for massive EBs charging applications based on the series-series (SS) IPT system with only one inverter is proposed in this paper. An additional capacitor with an ac switch is adopted at primary side to achieve alteration by changing the circuit parameter between CC mode and CV mode without complex control strategy. The proposed method has been verified with an experimental prototype and the results demonstrate that the designed output CC and CV meet the charging profile of EBs.
{"title":"Inductive power transfer for electric bicycles charging based on variable compensation capacitor","authors":"Y. Chen, R. Mai, Youyuan Zhang, Yong Li, Zhengyou He","doi":"10.1109/APEC.2017.7930878","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930878","url":null,"abstract":"It is of great significance to implement inductive power transfer (IPT) technology to massive Electric bicycles (EBs) charging as it is more convenient and safer than the plug-in systems. However, the cost of IPT systems is too expensive to employ when hundreds of inverters are needed for a parking lot. A novel method to realize constant current (CC) and constant voltage (CV) output for massive EBs charging applications based on the series-series (SS) IPT system with only one inverter is proposed in this paper. An additional capacitor with an ac switch is adopted at primary side to achieve alteration by changing the circuit parameter between CC mode and CV mode without complex control strategy. The proposed method has been verified with an experimental prototype and the results demonstrate that the designed output CC and CV meet the charging profile of EBs.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129537141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7931031
Stefan Skoog
Two of the major heat sources in a high-performance automotive lithium-ion battery cell are parameterized in this study: Joule heat and entropy heat. Established electrochemical models are investigated and experiments are designed to acquire the relevant parameters such as open circuit voltage, entropy coefficient and internal impedance from ohmic losses and mass transport. It is shown that the irreversible joule heat and the reversible entropy heat has a similar magnitude at many operating points for the device tested. The strong influence of irreversible entropy heat has the potential to absorb all the joule heat in currents up to 135 A (C-rate of 13.5) charging and 66 A (6.6 C) discharge in a power optimized automotive lithiumion cell. It is also shown that, by including the entropy heat in a simple thermal model, the temperature error can be reduced down to 28 % and 44 % for under charging and discharging with high currents, respectively.
本研究对高性能汽车锂离子电池的两个主要热源进行了参数化:焦耳热和熵热。对已建立的电化学模型进行了研究，并设计了实验，从欧姆损失和质量输运中获得了开路电压、熵系数和内阻抗等相关参数。结果表明，在被测器件的许多工作点上，不可逆焦耳热和可逆熵热具有相似的量级。在功率优化的汽车锂电池中，不可逆熵热的强大影响有可能吸收135 A (C-倍率13.5)充电电流和66 A (6.6 C)放电电流下的所有焦耳热量。结果表明，在简单的热模型中加入熵热，可以将低充放电和大电流放电的温度误差分别降低到28%和44%。
{"title":"Electro-thermal modeling of high-performance lithium-ion energy storage systems including reversible entropy heat","authors":"Stefan Skoog","doi":"10.1109/APEC.2017.7931031","DOIUrl":"https://doi.org/10.1109/APEC.2017.7931031","url":null,"abstract":"Two of the major heat sources in a high-performance automotive lithium-ion battery cell are parameterized in this study: Joule heat and entropy heat. Established electrochemical models are investigated and experiments are designed to acquire the relevant parameters such as open circuit voltage, entropy coefficient and internal impedance from ohmic losses and mass transport. It is shown that the irreversible joule heat and the reversible entropy heat has a similar magnitude at many operating points for the device tested. The strong influence of irreversible entropy heat has the potential to absorb all the joule heat in currents up to 135 A (C-rate of 13.5) charging and 66 A (6.6 C) discharge in a power optimized automotive lithiumion cell. It is also shown that, by including the entropy heat in a simple thermal model, the temperature error can be reduced down to 28 % and 44 % for under charging and discharging with high currents, respectively.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133062816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-03-26DOI: 10.1109/APEC.2017.7930938
SangCheol Moon, Bonggeun Chung, Gwan-Bon Koo, Jason Guo, L. Balogh
This paper proposes a new control method for an AC-DC Buck converter which is utilized as a front-end converter of a 2-stage high power density adapter. It presents a theoretical analysis, a design consideration, and experimental results. In the conventional adapter applications, 2-stage configuration shows higher power transfer efficiency and higher power density than those of the single stage flyback converter. In the 2-stage AC-DC converter, the boost converter is widely used as a front-end converter. It provides continuous input current and power factor correction. However, an efficiency variation between high AC line and low AC line is large. On the other hand, the proposed conduction band control method for a buck front-end converter has an advantage of small efficiency variation. In the proposed control method, switching operation is determined by a band control voltage which represents output load condition, and an AC line voltage. In half of line cycle, if the instantaneous line voltage is lower than the band control voltage, the buck converter operates and transfers power to the downstream converter. On the contrary, if the instantaneous line voltage is higher than the band control voltage, the buck converter stops switching operation. Thus, the proposed control method reduces switching loss under high AC line and light load condition. A 60W prototype which is configured the buck and LLC converter with the proposed control method is experimented on to verify the validity of the proposed system. The prototype shows 92.16% of AC-DC overall efficiency and 20.19 W/in3 of power density.
{"title":"A conduction band control AC-DC Buck converter for a high efficiency and high power density adapter","authors":"SangCheol Moon, Bonggeun Chung, Gwan-Bon Koo, Jason Guo, L. Balogh","doi":"10.1109/APEC.2017.7930938","DOIUrl":"https://doi.org/10.1109/APEC.2017.7930938","url":null,"abstract":"This paper proposes a new control method for an AC-DC Buck converter which is utilized as a front-end converter of a 2-stage high power density adapter. It presents a theoretical analysis, a design consideration, and experimental results. In the conventional adapter applications, 2-stage configuration shows higher power transfer efficiency and higher power density than those of the single stage flyback converter. In the 2-stage AC-DC converter, the boost converter is widely used as a front-end converter. It provides continuous input current and power factor correction. However, an efficiency variation between high AC line and low AC line is large. On the other hand, the proposed conduction band control method for a buck front-end converter has an advantage of small efficiency variation. In the proposed control method, switching operation is determined by a band control voltage which represents output load condition, and an AC line voltage. In half of line cycle, if the instantaneous line voltage is lower than the band control voltage, the buck converter operates and transfers power to the downstream converter. On the contrary, if the instantaneous line voltage is higher than the band control voltage, the buck converter stops switching operation. Thus, the proposed control method reduces switching loss under high AC line and light load condition. A 60W prototype which is configured the buck and LLC converter with the proposed control method is experimented on to verify the validity of the proposed system. The prototype shows 92.16% of AC-DC overall efficiency and 20.19 W/in3 of power density.","PeriodicalId":201289,"journal":{"name":"2017 IEEE Applied Power Electronics Conference and Exposition (APEC)","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114741670","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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