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2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)最新文献

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Hybrid transformer ZVS/ZCS DC-DC converter for photovoltaic microinverters 用于光伏微逆变器的混合变压器ZVS/ZCS DC-DC变换器
Bin Gu, J. Dominic, J. Lai, Hongbo Ma
This paper presents a high boost ratio dc-dc converter with hybrid transformer for non-isolated photovoltaic (PV) microinverters. The proposed converter incorporates the resonant operation mode into the traditional high boost ratio active-clamp coupled-inductor PWM converter, achieving ZVS turn-on of the switches and ZCS turn-off of the diodes. As a result of the inductive and capacitive energy being transferred simultaneously within both turn-on and turn-off intervals of the main switch, the dc bias of the magnetizing current is reduced and hence the size of magnetics can be reduced. The magnetizing inductance is designed with a small value to utilize ripple magnetizing current to assist ZVS of main switch, while maintaining low RMS conduction losses. The voltage stresses on the active switches and diodes are maintained at a low level and are independent of the wide changing input PV voltages as a result of the resonant capacitor in series in the energy transfer loop. The experimental results based on 250 W prototype circuit show system CEC efficiencies greater than 96.7% over 20 V to 45 V PV voltage range.
提出了一种用于非隔离型光伏微逆变器的高升压比混合变压器dc-dc变换器。该变换器将谐振工作模式融入传统的高升压比有源钳位耦合电感PWM变换器中,实现了开关的ZVS导通和二极管的ZCS关断。由于在主开关的导通和关断间隔内感应能量和容性能量同时传递,磁化电流的直流偏置减小,因此可以减小磁体的尺寸。磁化电感设计为小值,利用纹波磁化电流辅助主开关的ZVS,同时保持较低的RMS导通损耗。主动式开关和二极管上的电压应力保持在一个较低的水平,并且与宽变化的输入PV电压无关,这是能量传递环路中串联谐振电容的结果。基于250w原型电路的实验结果表明,在20v ~ 45v PV电压范围内,系统CEC效率大于96.7%。
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引用次数: 12
Conducted EMI in SiC JFET inverters due to substrate capacitive coupling SiC JFET逆变器中基片电容耦合导致的传导电磁干扰
X. Gong, J. Ferreira
This paper investigates the conducted EMI in SiC JFETs based inverters for motor drives under the influence of capacitive coupling from two types of substrates - Insulated Metal Substrate (IMS) and heat sinks. The inverter prototypes are implemented with the discrete SiC Transistors attached on top of the two substrates, which creates capacitive coupling between the device drain plate and the substrate base plate. The resulting EMC differences are analyzed and compared. It is found that the employment of IMS significantly deteriorates the EMC performance due to the extensive capacitive coupling magnitude. The method of using another substrate layout - each SiC JFET is placed on top of a separated heat sink to minimize the coupling is proposed. The EMI spectrums of the above inverters are compared under unfiltered and filtered conditions. It is found that the inverter version of using separated heat sinks reduces EMI both in the middle and high frequency ranges, which greatly releases the filtering effort. Finally, their different EMI filter requirements are analyzed and implemented, which effectively suppresses the conducted EMI to comply with the standard prescribed by IEC61800-3 C2 Qp.
本文研究了在绝缘金属衬底(IMS)和散热器两种衬底电容耦合的影响下,基于SiC jfet的电机驱动逆变器的传导电磁干扰。逆变器原型是用两个衬底顶部连接的离散SiC晶体管实现的,这在器件漏极和衬底基板之间产生电容耦合。分析和比较了由此产生的电磁兼容差异。研究发现,由于电容耦合幅度较大,IMS的采用显著降低了电磁兼容性能。提出了使用另一种衬底布局的方法-每个SiC JFET放置在一个分离的散热器顶部,以尽量减少耦合。比较了上述逆变器在未滤波和滤波条件下的电磁干扰频谱。研究发现,采用分离散热片的逆变器在中频和高频范围内都降低了电磁干扰,大大减轻了滤波的工作量。最后,分析并实现了不同的EMI滤波器要求,有效抑制传导EMI,使其符合IEC61800-3 C2 Qp标准。
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引用次数: 4
Single-phase PWM rectifier with power decoupling ripple-port for double-line-frequency ripple cancellation 带功率去耦纹波口的单相PWM整流器,用于双线频纹波消除
S. Harb, R. Balog
This paper proposes a new technique for double-frequency ripple-power decoupling in a single-phase PWM rectifier that does not require an electrolytic capacitor, which improves the reliability of the system for long-life applications such as LED lighting. A ripple-port is added in parallel with the output of the PWM rectifier to filter the double-line-frequency ripple using the minimum capacitance necessary for power buffering. Hence, a very small, highly reliable film capacitor is used, which will improve the reliability dramatically compared to the bulky electrolytic capacitor option, which increased the power density of the system. The proposed topology doubles the MTBF increases the lifetime by one order of magnitude. Moreover, the design and control of the ripple-port is independent from the PWM rectifier circuit, so it can be dropped in as an auxiliary circuit to an existing design.
本文提出了一种不需要电解电容的单相PWM整流器双频纹波功率解耦新技术,提高了系统在LED照明等长寿命应用中的可靠性。纹波端口与PWM整流器的输出并联,使用功率缓冲所需的最小电容滤波双线频率纹波。因此,使用非常小,高可靠的薄膜电容器,这将大大提高可靠性相比,笨重的电解电容器选项,增加了系统的功率密度。所提出的拓扑使MTBF翻倍,寿命提高了一个数量级。此外,纹波端口的设计和控制与PWM整流电路无关,因此它可以作为辅助电路加入到现有设计中。
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引用次数: 44
Common mode and differential mode circulating-current control in paralleled single-phase boost rectifiers 并联单相升压整流器的共模和差模循环电流控制
Y. Liao, Hung-Chi Chen, Hsiu-Che Cheng
In this paper, the analysis of circulating currents of a paralleled single-phase boost rectifier system is presented. The DC loop and AC loop circulating currents are clearly explained. Based on the analysis of circulating currents, common mode circulating current (CMCC) and differential mode circulating current (DMCC) are clearly defined. Then, CMCC and DMCC compensators in a centralized control scheme are proposed to reduce the common-mode and differential-mode circulating currents in the parallel rectifier system. Finally, a prototype system is constructed and some experimental results are carried out to verify the validity of the proposed control scheme. From experimental results, the proposed control scheme can indeed reduce the circulating currents under different power rating condition in the parallel system.
本文对并联单相升压整流系统的循环电流进行了分析。说明了直流回路和交流回路的环流。在分析循环电流的基础上,明确了共模循环电流(CMCC)和差模循环电流(DMCC)的定义。然后,提出了CMCC和DMCC补偿器的集中控制方案,以减小并联整流系统的共模和差模循环电流。最后,构建了原型系统,并进行了实验验证了所提控制方案的有效性。实验结果表明,所提出的控制方案确实可以减小并联系统在不同额定功率条件下的循环电流。
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引用次数: 7
Surface spiral coil design methodologies for high efficiency, high power, low flux density, large air-gap wireless power transfer systems 表面螺旋线圈设计方法用于高效率、高功率、低磁通密度、大气隙无线电力传输系统
Seung-Hwan Lee, R. Lorenz
It was demonstrated that a surface spiral winding coil has low skin- and proximity effect losses in MHz, high power wireless power transfer systems. However, it was not clearly explained why the surface spiral winding coil is appropriate to use in kW level, low flux density, and safe wireless power transfer systems. Furthermore, research has not focused on the losses of a dielectric substrate of a surface spiral winding coil, even though the dielectric loss can overwhelm the skin- and proximity effect losses at MHz frequencies. In the first part of this paper, the benefits of the surface spiral winding coils for large air-gap, kW level wireless power transfer systems are discussed. In the following section, various sources of the power dissipation in surface spiral coils are identified. The discussion focuses on the dielectric losses in the substrates of surface spiral winding coils. Low-loss substrate design guidelines are proposed using the investigation results. The proposed design guidelines are evaluated by means of FEA simulation.
结果表明,表面螺旋线圈在兆赫、高功率无线电力传输系统中具有较低的趋肤效应和接近效应损耗。然而,并没有清楚地解释为什么表面螺旋绕组线圈适用于kW级,低磁通密度和安全的无线电力传输系统。此外,研究还没有集中在表面螺旋绕组线圈的介电基板的损耗上,即使介电损耗可以压倒在MHz频率下的趋肤效应和邻近效应损耗。本文第一部分讨论了表面螺旋线圈在大气隙、kW级无线电力传输系统中的优点。在下一节中,确定了表面螺旋线圈中功率耗散的各种来源。重点讨论了表面螺旋线圈衬底的介电损耗。根据调查结果提出了低损耗衬底设计指南。通过有限元模拟对所提出的设计准则进行了评价。
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引用次数: 17
A robust multi-resonant PR regulator for three-phase grid-connected VSI using direct pole placement design strategy 采用直接极位设计策略的三相并网VSI鲁棒多谐振PR调节器
Bin Li, Ming Zhang, Long Huang, L. Hang, L. Tolbert
An averaged switching model of grid-connected inverter using dual-loop current control with LCL-filter in discrete domain is built under stationary frame. A proportional resonant (PR) regulator is adopted in the current-loop to track the given fundamental sinusoidal current without steady state error. In addition, in order to reduce the low frequency harmonics, the resonance of 5th harmonics is adopted. Because the system is of high order and complex, the theory of root locus is proposed to analyze the influence of parameters in PR regulator, the influence of digital delay, and the LCL-filter. Based on the theoretical analysis, the poles can be properly selected to guarantee the stability of the system and the performance of current-loop during wide grid-fed power. Finally, a 10 kW prototype of grid-connected inverter with LCL-filter is set up to verify the effectiveness, practicality, and robustness of the proposed design method.
在固定框架下,建立了采用离散域lcl滤波的双环电流控制并网逆变器的平均开关模型。在电流环中采用比例谐振(PR)调节器来跟踪给定的基波正弦电流,无稳态误差。此外,为了减少低频谐波,采用了五次谐波共振。针对系统的高阶性和复杂性,提出了根轨迹理论来分析PR调节器参数、数字延迟和lcl滤波器的影响。在理论分析的基础上,合理选择极点可以保证系统的稳定性和大电网供电时电流环的性能。最后,搭建了一个10 kW的lcl滤波器并网逆变器样机,验证了所提设计方法的有效性、实用性和鲁棒性。
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引用次数: 16
On the use of front-end cascode rectifiers based on normally-on SiC JFET and Si MOSFET 基于常通SiC JFET和Si MOSFET的前端级联整流器的使用
A. Vázquez, Alberto Rodríguez, Marcos Fernandez, M. Hernando, †. EnriqueMasset, Javier Sebastián, Edificio Departamental
The new wide band-gap semiconductor devices provide new properties to be explored. Normally-on Silicon Carbide (SiC) JFET power devices have several advantages, in particular low switching losses, high temperature operation and high reverse voltage capability. Looking for improve the overall efficiency in power converters, new structures based on these power devices might be studied. In this paper, a cascode rectifier based on normally-on SiC JFET is presented and analyzed. This new rectification structure can be applied as front-end rectifier stage for AC-DC power converters, increasing the overall efficiency of these topologies. A second cascode rectifier based on Silicon (Si) MOSFET is also studied, as a low cost alternative. Both cascode structures are compared with traditional Si rectifier diodes and front-end rectifiers, using three different test circuits: a full bridge rectifier, a passive Power Factor Corrector (PFC) voltage doubler and an active PFC interleaved boost converter. As a result of this comparison, an efficiency improvement as high as two points is obtained on each tested circuit.
新的宽带隙半导体器件提供了新的特性有待探索。正常导通的碳化硅(SiC) JFET功率器件具有几个优点,特别是低开关损耗、高温工作和高反向电压能力。为了提高功率变换器的整体效率,可以在这些功率器件的基础上研究新的结构。本文提出并分析了一种基于常通SiC JFET的级联整流器。这种新的整流结构可以应用于交直流电源变换器的前端整流级,提高了这些拓扑结构的整体效率。本文还研究了基于硅(Si) MOSFET的二次级联整流器,作为低成本的替代方案。这两种级联码结构都与传统的硅整流二极管和前端整流器进行了比较,使用了三种不同的测试电路:全桥整流器、无源功率因数校正(PFC)倍压器和有源功率因数校正(PFC)交错升压转换器。作为这种比较的结果,在每个测试电路上都获得了高达两点的效率改进。
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引用次数: 16
Low complexity system for real-time determination of current-voltage characteristic of PV modules and strings 用于实时测定光伏组件和串电流-电压特性的低复杂度系统
N. Lima, L. D. de Freitas, G. M. Buiatti, J. Vieira, L. Freitas, E. Coelho
This paper presents a low complexity system for characterizing Photovoltaic (PV) modules and strings in real-time, allowing accurate measurements and analysis of the actual power production of PV systems in real operation conditions. Applicability of this characterization system is in the real-time condition monitoring of such PV systems when suitable algorithms that make use of such current-voltage information (here in called I-V curve) are applied. For this purpose, a classical Boost converter is used operating as a controlled electronic load. The I-V points obtained from the load variation between the electrical terminals of the PV module or string are used to trace the whole I-V curve. The values obtained by the proposed system are compared with reference values obtained through a high accuracy I-V curve tracer available in the market, in order to validate the accuracy of the here proposed characterization system. The availability of such data makes possible to identify the presence of partial shadows that may lead to more than one local and global Maximum Power Point (MPP). It is even possible to quantify the power loss production that might raise-up due to the shadow presence, depending on Maximum Power Point Tracking (MPPT) algorithm adopted by the power converter between the PV strings and the grid or load connected to the latter one.
本文提出了一种低复杂度的系统,用于实时表征光伏组件和串,可以准确测量和分析光伏系统在实际运行条件下的实际发电量。该表征系统的适用性是在光伏系统的实时状态监测中,使用合适的算法,利用这些电流-电压信息(这里称为I-V曲线)。为此,使用经典升压变换器作为受控电子负载工作。利用光伏组件或串的电气端子之间的负载变化得到的I-V点来跟踪整个I-V曲线。将所提出的系统获得的值与通过市场上可用的高精度I-V曲线示踪剂获得的参考值进行比较,以验证本文所提出的表征系统的准确性。这些数据的可用性使识别可能导致多个局部和全局最大功率点(MPP)的部分阴影的存在成为可能。甚至可以根据光伏串与电网或连接到后者的负载之间的功率转换器采用的最大功率点跟踪(MPPT)算法,量化由于阴影存在而可能增加的功率损耗。
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引用次数: 11
Double-sided cooling design for novel planar module 新型平面模块双面散热设计
P. Ning, Zhenxian Liang, F. Wang
A novel packaging structure for medium power modules featuring power semiconductor switches sandwiched between two symmetric substrates that fulfill electrical conduction and insulation functions is presented. Large bonding areas between dies and substrates allow this packaging technology to offer significant improvements in electrical, thermal performance. Double-sided cooling system was dedicatedly analyzed and designed for different applications.
提出了一种新型的中功率模块封装结构,将功率半导体开关夹在两个对称基板之间,实现导电和绝缘功能。模具和基板之间的大结合区域允许这种封装技术在电气,热性能方面提供显着改进。针对不同的应用场合,对双面冷却系统进行了分析和设计。
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引用次数: 18
Practical transformer modeling and characterization for a high performance LLC converter 高性能LLC变换器的实用变压器建模与特性分析
B. McDonald, D. Freeman
This paper will present a method to model and characterize a typical LLC dc-dc converter transformer with a center tapped secondary. The emphasis of the model will be on the ease of characterization using practical lab equipment and its subsequent suitability for simulation in a number of practical venues (e.g. Saber, Simplis, Pspice [9][10][11]). Practical design implications for the LLC converter will also be explored.
本文将介绍一种方法来建模和表征一个典型的中心抽头的LLC dc-dc换流变压器。该模型的重点将放在使用实际实验室设备进行表征的便利性及其随后在许多实际场所(例如Saber, Simplis, Pspice[9][10][11])进行模拟的适用性上。实际设计的影响,有限责任公司转换器也将探讨。
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引用次数: 4
期刊
2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)
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