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2020 IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)最新文献

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Design of a DC-DC Converter using SiC Trench MOSFETs for EV Fast Chargers 用于电动汽车快速充电器的SiC沟槽mosfet DC-DC变换器的设计
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360254
O. Karimzada, Takayuki Uchida, T. Masuda, Y. Mori, A. Shima, G. Donato
Recent increased demand in high power density and high-efficiency converters for EV charging makes wide bandgap semiconductors, particularly silicon carbide (SiC), excellent candidates of choice to meet this demand. This paper presents a step-down DC-DC converter using trench SiC MOS made by HITACHI for EV ultra-fast charging. It compares the efficiency and performance of the converter with IGBT and other SiC transistors. In all cases, it shows the clear advantage of the trench etched MOS over alternatives.
最近对电动汽车充电的高功率密度和高效率转换器的需求增加,使得宽禁带半导体,特别是碳化硅(SiC),成为满足这一需求的绝佳选择。本文介绍了一种用于电动汽车超快充电的降压式直流-直流变换器。并与IGBT和其他碳化硅晶体管的效率和性能进行了比较。在所有情况下,它显示了壕沟蚀刻MOS相对于其他选择的明显优势。
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引用次数: 2
A Compact Device Model for SiC MOSFETs Valid for Wide-Temperature Range 一种适用于宽温度范围的SiC mosfet紧凑器件模型
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360251
Kyohei Shimozato, S. Bian, Takashi Sato
A compact model for SiC MOSFETs valid for wide temperature range is proposed. The model equations that represent temperature dependence of five model parameters are determined according to device physics. Unlike existing models, carrier mobility increases with temperature in the proposed model due to the discharge of the interface trap. The proposed model accurately expresses the measured I-V characteristics of commercial SiC MOSFETs over 300° C.
提出了一种适用于宽温度范围的SiC mosfet结构紧凑的模型。根据器件物理特性,确定了五个模型参数与温度关系的模型方程。与现有模型不同的是,由于界面阱的放电,该模型中的载流子迁移率随温度升高而增加。所提出的模型准确地表达了商用SiC mosfet在300°C以上测量的I-V特性。
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引用次数: 2
Magnetic Integration for GaN-based DC-DC Converters 基于gan的DC-DC变换器的磁集成
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360293
Longyang Yu, Chengzi Yang, Chaojie Li, Min Wu, Xiang Zhou, Laili Wang
With the emerging technology of wide-band-gap power semiconductors and modern ferrite materials, the switching frequency of DC-DC converters based on gallium nitride devices (GaN) can be further pushed to megahertz range. The number of magnetic core is bottleneck of achieving both low cost and high power density. In this paper, a novel magnetic structure with a four-leg magnetic core is proposed to tackle the issue. The DC-DC converters including two inductances can be integrated into the proposed magnetic structure. Two windings of inductances are arranged as orthogonality in the magnetic structure, achieving magnetic decoupling. The inductances based on the magnetic structure are calculated and verified through magnetic circuit analysis and three-dimensional finite element analysis simulation. A GaN-based hardware prototype employing the proposed magnetic structure is built and tested to verify the performance.
随着宽带隙功率半导体技术和现代铁氧体材料的兴起,基于氮化镓器件(GaN)的DC-DC变换器的开关频率可以进一步推进到兆赫范围。磁芯的数量是实现低成本和高功率密度的瓶颈。本文提出了一种新型的四脚磁芯结构来解决这一问题。包含两个电感的DC-DC转换器可以集成到所提出的磁性结构中。电感的两个绕组在磁性结构中呈正交排列,实现磁去耦。通过磁路分析和三维有限元分析仿真,计算并验证了基于磁性结构的电感。建立了基于gan的磁性结构硬件原型,并对其性能进行了测试。
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引用次数: 0
A Dynamic Switching Response Improved SPICE Model for SiC MOSFET with Non-linear Parasitic Capacitance 非线性寄生电容SiC MOSFET的动态开关响应改进SPICE模型
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360267
F. Hsu, C. Hung, K. Chu, L. Lee, Chwan-Ying Lee
SiC MOSFET is one of the most popular power devices in some high-end applications. Since SiC MOSFET has already penetrated into many applications, the requirement of accurate SPICE models is a significant issue for circuit designers. From previous literature, researchers have already exported models that could well-approximate the output characteristics of realistic SiC MOSFETs. Yet, the capacitance models are still based on an exponential model. The mismatching between these rough models and practical devices may induce unpredictable failures. In this work, a simple and accurate SPICE capacitance model for SiC MOSFET has been established by inserting an auxiliary modified function into each capacitor model. Compared to conventional models, dynamic behavior similarity gains significant improvements. Moreover, a switching test has also been done to evaluate the dynamic performance. As a result, the simulated waveform by the proposed method is quite similar to the experimental waveform. In short, this paper provides a better method to match the characteristics of SiC MOSFET by a simple modified capacitance model.
SiC MOSFET是一些高端应用中最受欢迎的功率器件之一。由于SiC MOSFET已经渗透到许多应用中,精确的SPICE模型的要求是电路设计人员的一个重要问题。从以前的文献中,研究人员已经导出了可以很好地近似实际SiC mosfet输出特性的模型。然而,电容模型仍然基于指数模型。这些粗糙模型与实际装置之间的不匹配可能导致不可预测的故障。在本工作中,通过在每个电容模型中插入辅助修正函数,建立了简单准确的SiC MOSFET SPICE电容模型。与传统模型相比,动态行为相似度得到了显著提高。此外,还进行了开关试验,以评估其动态性能。结果表明,该方法模拟的波形与实验波形非常接近。总之,本文通过简单的修正电容模型提供了一种更好的方法来匹配SiC MOSFET的特性。
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引用次数: 1
Design of Packaging Structure in High Voltage Power Modules to Avoid Surface Breakdown 避免表面击穿的高压电源模块封装结构设计
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360276
Feifei Yan, Laili Wang, Tao Yang, Binyu Wang, Fengtao Yang, Longyang Yu
In high voltage power modules, the triple point lies between metallization, ceramic and silicone gel. Electric stress is much higher at triple point than average electric field. The situation gets worse when the triple point lies in the electrode spacing. Short distance between electrodes can enhance the electric stress and increase the damage from repeated PDs. This paper proves that interface between ceramic and silicone gel is a weak insulation area. Repeated partial discharges (PD) can induce surface breakdown along the interface area. Consequently, triple point combines high electric stress and weak insulation together. In order to separate the interface area from the edge of metallization, this paper proposes a new geometry of the ceramic substrate.
在高压电源模块中,三相点位于金属化、陶瓷和硅胶之间。三相点处的电应力比平均电场高得多。当三相点位于电极间距时,情况变得更糟。电极之间的距离较短会增加电应力,增加重复放电的损伤。证明了陶瓷与硅胶之间的界面是一个弱绝缘区。重复局部放电(PD)可沿界面区诱发表面击穿。因此,三相点结合了高电应力和弱绝缘在一起。为了将界面区与金属化边缘区分离,本文提出了一种新的陶瓷基板几何形状。
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引用次数: 2
Cost Comparison Between GaN-based and Si-based 4.5-kW Single-phase Inverters 氮化镓和硅基4.5 kw单相逆变器的成本比较
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360282
Zhe Yang, Jianliang Chen, P. Williford, Fred Wang
This paper presents the converter design and cost comparison between Gallium Nitride (GaN)-based and Silicon (Si)-based 4.5-kW single-phase inverters. For fair comparison, both inverters are optimized under the same requirement as a practical Si PV inverter. The cost of the components are based on the component prices at high quantity. The study shows that although the cost of active devices and heatsink is higher for GaN-based inverter, the overall cost can be $ 19 (10%) lower than Si-based counterpart by using switching frequency 6 times higher, which drastically shrinks the passive filters. A GaN-based prototype is built and tested to verify the design.
本文介绍了基于氮化镓(GaN)和基于硅(Si)的4.5 kw单相逆变器的设计和成本比较。为了公平比较,两种逆变器在与实际硅光伏逆变器相同的要求下进行了优化。组件的成本是基于组件的价格在高数量。研究表明,尽管基于gan的逆变器的有源器件和散热器的成本较高,但通过使用高6倍的开关频率,总体成本可以比基于si的逆变器低19美元(10%),这大大缩小了无源滤波器。建立了基于gan的原型并进行了测试以验证设计。
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引用次数: 1
Optimization of Vertical GaN SGT-MOSFET for Low Ron 低功耗垂直GaN SGT-MOSFET的优化
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360257
N. Jaiswal, V. N. Ramakrishnan, Sukhendu deb Roy
We present a new 600 V breakdown optimized vertical GaN Split-Gate Trench power MOSFET (SGTMOSFET) device with significantly reduced specific on-resistance and lower reverse capacitance. Using TCAD numerical simulations, we demonstrate that the SGTMOSFET exhibits about 30% lower specific on-resistance and about five times reduction in the reverse capacitance when compared to a conventional TG-MOSFET with similar breakdown voltage.
我们提出了一种新的600 V击穿优化的垂直GaN分栅沟槽功率MOSFET (SGTMOSFET)器件,具有显着降低的比导通电阻和更低的反向电容。使用TCAD数值模拟,我们证明了与具有相似击穿电压的传统TG-MOSFET相比,SGTMOSFET的比导通电阻降低了约30%,反向电容降低了约5倍。
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引用次数: 2
Loss Model of High-Frequency Planar Transformer for High-Voltage Resonant DC/DC Converter 高压谐振DC/DC变换器高频平面变压器损耗模型
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360297
Jinshu Lin, Yehui Yang, S. Yin, Xiong Xin, Runze Wang, Minghai Dong, Hui Li
The increasing demands towards the power density and miniaturization on the power converters make the transformer become the bottleneck. For the traditional transformer, the copper wire is fixed on magnetic core by using the plastic bobbin, which may lead to a bulky size. The planar transformer adopts the multi-layer printed circuit board (PCB) as the winding structure and also uses the planar core, thus to remarkably reduce the size, especially the height. For the DC/DC converter with a high step-up ratio, the transformer with a high turn ratio and the Cockcroft-Walton voltage multiplier are normally employed to achieve the high voltage gain. Since this converter normally works in the zero-voltage-switching (ZVS) mode with relatively low output power, the power dissipation of transformer becomes a key issue. This work demonstrates the loss model of a planar transformer, which is used in the 24-V/1.8-kW resonant DC/DC converter with 20-W peak output power. The loss analysis is compared with the experimental results and a good agreement achieved. It is found that the winding loss is the dominating factor of the total loss.
随着对功率变换器功率密度和小型化要求的不断提高,变压器成为其发展的瓶颈。对于传统的变压器来说,铜线是通过塑料线轴固定在磁芯上的,这可能会导致体积庞大。平面变压器采用多层印刷电路板(PCB)作为绕组结构,采用平面铁芯,大大减小了尺寸,尤其是高度。对于高升压比的DC/DC变换器,通常采用高匝比变压器和Cockcroft-Walton电压乘法器来实现高电压增益。由于该变换器通常工作在零电压开关(ZVS)模式下,输出功率相对较低,因此变压器的功耗成为关键问题。本工作演示了用于峰值输出功率为20w的24v /1.8 kw谐振DC/DC变换器的平面变压器的损耗模型。将损耗分析结果与实验结果进行了比较,得到了较好的一致性。结果表明,绕组损耗在总损耗中占主导地位。
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引用次数: 0
Improved Control of GaN-based Active-clamped FIyback Converter with Shorter Reverse Conduction Time gan有源箝位反导变换器的改进控制
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360258
Minggang Chen, Shen Xu, Linlin Huang, Weifeng Sun
As GaN HEMT can achieve high switching frequency of several MHz easily, it was widely used in resonant converter for high power density. In this paper, the reverse conduction of GaN HEMT within active-clamped flyback (ACF) converter is analyzed, and a novel control method is proposed to reduce the reverse conduction related power loss. In order to verify the proposed control strategy, a 12V-3A GaN-based ACF is designed and fabricated. The experimental results show that the reverse conduction time is reduced from 300ns to 20ns, which contribute to a 1.2% increase in efficiency. The proposed control method is implemented by FPGA.1
由于GaN HEMT可以轻松实现数MHz的高开关频率,因此被广泛应用于高功率密度的谐振变换器中。本文分析了有源箝位反激变换器(ACF)内GaN HEMT的反导问题,提出了一种新的控制方法来降低反导相关的功率损耗。为了验证所提出的控制策略,设计并制作了一个基于12V-3A gan的ACF。实验结果表明,反导时间从300ns缩短到20ns,效率提高1.2%。该控制方法由fpga 1实现
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引用次数: 0
Variable Gate Voltage Control for Paralleled SiC MOSFETs 并联SiC mosfet的可变栅电压控制
Pub Date : 2020-09-23 DOI: 10.1109/WiPDAAsia49671.2020.9360253
Yuqi Wei, Rosten Sweeting, Md Maksudul Hossain, Haider Mhiesan, A. Mantooth
Silicon carbide (SiC) MOSFETs have been widely used in different power conversion applications due to their advantages of high switching frequency and low loss. Parallel connection of SiC MOSFET is a cost-effective and necessary solution for high power rating converter. However, due to the differences of devices parameters, imbalance current exists, which may damage the system. In this paper, the issues of the paralleling SiC MOSFETs are well analyzed based on the static characteristics of the devices. Based on the analysis, we can find that the unbalanced transient current caused by the differences of threshold voltages are important and require to be mitigated when paralleling SiC MOSFETs. Then, the operational principles of the proposed variable gate voltage control are presented. Simulation and experiment results are presented and analyzed to validate the effectiveness of the proposed active gate driving method.
碳化硅(SiC) mosfet具有开关频率高、损耗低的优点,广泛应用于各种功率转换领域。SiC MOSFET并联是高功率变换器的一种经济有效的解决方案。但由于器件参数的差异,存在电流不平衡,可能对系统造成损害。本文从器件的静态特性出发,详细分析了并联SiC mosfet器件存在的问题。通过分析可以发现,阈值电压差异引起的不平衡瞬态电流是重要的,需要在并联SiC mosfet时加以缓解。然后,给出了可变栅极电压控制的工作原理。仿真和实验结果验证了主动栅极驱动方法的有效性。
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引用次数: 6
期刊
2020 IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)
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