共查询到20条相似文献,搜索用时 234 毫秒
1.
2.
为了对碳化硅(SiC) MOSFET功率器件的特性参数进行全面的研究,提出了一种碳化硅(SiC) MOSFET变温度参数模型,该模型考虑了功率器件中封装引脚寄生电感、内部寄生电容、体二极管等特性参数,并根据器件的开关过程中的不同阶段,将功率器件中的导电沟道等效为不同电路模型。为获取该模型中的涉及的特性参数,搭建了基于Agilent B1505A功率半导体分析仪和矢量网络分析仪(VNA)的测试平台对SiC MOSFET功率器件的静态特性参数进行了全面测量,然后使用基于贝叶斯正则化LM算法的改进BP人工神经网络对所测的数据进行非线性拟合。结果表明,相较于传统拟合方法,该方法具有更高的精确度与泛化能力,为SiC MOSFET功率器件建模与参数分析提供了重要依据。 相似文献
3.
4.
5.
《电力电子技术》2015,(12)
通过采用双脉冲测试方法,以具有相同电流额定值的SiC MOSFET CMF10120D(1 200V/24A)和Si IGBT IKW25T120(1 200 V/25 A)作为样本,在相同测试条件下研究了两种器件的动态特性、反并联二极管的反向恢复特性和开关损耗。研究发现,SiC MOSFET的开关速度快,开关损耗仅为Si IGBT的69%。最后,利用IPOSIM对两种器件应用于三相逆变器中的结温进行对比研究。结果表明,在输出频率为50 Hz时,Si IGBT的最大结温为166℃,已超过允许的150℃,结温波动为37℃,而SiC MOSFET的最大结温仅为105℃,结温波动仅为19℃;反并联二极管的结温波动基本相同,但Si IGBT反并联二极管的最大结温要高出26℃。因而,在大功率、高温电力电子变换器的应用中,SiC MOSFET更具优越性。 相似文献
6.
7.
8.
根据开关器件的物理模型,分析并计算了开关器件在DC/DC变换电路中的功率损耗。针对工程应用中开关器件损耗计算的实时性和精确性要求,利用功率开关器件手册提供的产品参数,分别计算了逆变部分的SiC MOSFET模块和整流部分的整流二极管的器件损耗。将计算值与PLECS仿真结果进行对比,结果表明该计算方法可得到较为准确的计算损耗,进一步提高了工程应用中损耗计算的准确性。 相似文献
9.
高频感应焊机可用于钢管直缝焊接,主要特点为开关频率高和设备功率大,功率器件为硅MOSFET和硅快恢复二极管。由于硅基功率器件的特性限制,高频感应焊机的效率、容量和成本受到了一定制约。随着碳化硅功率器件技术的不断成熟,其性能特点尤其适用于大功率高频感应焊机设备。通过对硅和碳化硅功率器件参数进行对比分析,使用碳化硅功率器件对现有串联型高频感应焊机主电路进行优化,并设计了适用于多器件并联的SiC MOSFET驱动电路和功率单元。最后,搭建了1台100 kW/500 kHz的SiC MOSFET串联型高频感应焊机样机,进行实验测试。实验结果表明,所设计的高频感应焊机性能和焊接效率均高于现有设备。 相似文献
10.
碳化硅(silicon carbide,SiC)金属半导体场效应管(metal semiconductor field effect transistor,MOSFET)以其优异的材料特性成为一种很有前景的高功率密度和效率的器件,其工作结温是评估器件运行可靠性的关键指标。文中提出一种基于SiC MOSFET体二极管电致发光效应的非接触式的在线结温检测方法。首先从理论角度分析SiC MOSFET体二极管电致发光的原理,并对电致发光的光谱特性进行研究,分析和比较可用于结温测量的3种温敏光参数。其次通过检测具备负温度系数的发光峰光强,并辅以对SiC MOSFET体二极管导通电流的检测,实现了结温的动态提取,检测分辨率达3.1mV/℃。并且在Buck电路中验证该方法的可行性,检测误差在±3℃以内。该方法基于SiC MOSFET体二极管的电致发光检测,具备固有电气隔离的特点,特别适用于高压应用场合下SiC MOSFET的非接触式结温检测。 相似文献
11.
12.
Elasser A. Kheraluwala M.H. Ghezzo M. Steigerwald R.L. Evers N.A. Kretchmer J. Chow T.P. 《Industry Applications, IEEE Transactions on》2003,39(4):915-921
Recent progress in silicon carbide (SiC) material has made it feasible to build power devices of reasonable current density. This paper presents results including a comparison with state-of-the-art silicon diodes. Switching losses for two silicon diodes (a fast diode, 600 V, 50 A, 60 ns Trr), an ultrafast silicon diode (600 V, 50 A, 23 ns Trr), and a 4H-SiC diode (600 V, 50 A) are compared. The effect of diode reverse recovery on the turn-on losses of a fast insulated gate bipolar transistor (IGBT) are studied both at room temperature and at 150 /spl deg/C. At room temperature, SiC diodes allow a reduction of IGBT turn-on losses by 25% compared to ultrafast silicon diodes and by 70% compared to fast silicon diodes. At 150 /spl deg/C junction temperature, SiC diodes allow turn-on loss reductions of 35% and 85% compared to ultrafast and fast silicon diodes, respectively. The silicon and SiC diodes are used in a boost converter with the IGBT to assess the overall effect of SiC diodes on the converter characteristics. Efficiency measurements at light load (100 W) and full load (500 W) are reported. Although SiC diodes exhibit very low switching losses, their high conduction losses due to the high forward drop dominate the overall losses, hence reducing the overall efficiency. Since this is an ongoing development, it is expected that future prototypes will have improved forward characteristics. 相似文献
13.
The paper concerns the problem of SPICE modeling of the merged pin Schottky (MPS) diodes. In the paper, the SPICE electrothermal model (ETM) of the SiC MPS diodes proposed by Infineon Technologies is investigated. The model was verified experimentally by comparing the calculated and the measured d.c. characteristics of the diode IDT06S60C. Some modifications of the model resulting in the improvement of its accuracy at d.c. analysis are proposed. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
14.
研制了一种3 300 V 碳化硅(silicon carbide, SiC) 肖特基二极管(schottky barrier diodes,SBD)嵌入式金属-氧化物半导体场效应晶体管(metal-oxide-semiconductor field effect transistors,MOSFET),即在传统MOSFET结构中集成一个由钛形成的肖特基接触。在芯片制造过程中,通过增加Ni退火后的表面处理工艺,使得栅源短路失效率降低约58%。研究发现,当二极管电流密度JSD=100 A/cm2时,嵌入式二极管电压降VSD(SBD)=2.1 V,寄生二极管的开启电压约为8 V,这说明嵌入式SBD可以抑制MOSFET寄生二极管开启,降低碳化硅MOSFET“双极退化”风险。另外,该芯片的阈值电压为3.05 V,比导通电阻和阻断电压分别为18.9 mΩ·cm2和3 955 V,在高压轨交市场具有广阔的应用前景。 相似文献
15.
The paper concerns the problem of modelling of silicon and silicon carbide power Schottky diodes. The SPICE built‐in isothermal model of silicon diodes and the electrothermal model of silicon carbide Schottky diodes proposed by Infineon Technologies are investigated and modified. The quality of Schottky diodes modelling is estimated by measurements. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
16.
有源功率因数校正(Active Power Factor Correction,简称APFC)是大功率电源应用的一项关键技术.分析了Boost PFC电路中半导体器件的开关损耗以及SiC肖特基二极管的工作特性.SiC肖特基二极管可以有效降低开关损耗,并有助于大功率APFC电路实现高频率应用.在一台3.6kW的样机上,利用SiC肖特基二极管实现了150 kHz的开关工作频率. 相似文献
17.
Thermomechanical Reliability of Low-Temperature Sintered Silver Die Attached SiC Power Device Assembly 总被引:2,自引:0,他引:2
A thermomechanical reliability study was conducted on a low-temperature sintered silver die attached SiC power device assembly. The silver die attachment was formed by sintering nanoscale silver paste in air at 300 degC to form a strong bond between silver- or gold-coated direct-bond-copper substrates and silver-metallized SiC Schottky diodes. Using the 50% drop in the die-shear strength as the failure criterion, an accelerated thermal cycling experiment between 50 degC and 250 degC showed that the silver die attachment can survive more than 4000 cycles, indicating its high thermomechanical reliability at the interested temperature range. Established mainly by scanning electron microscopy/energy-dispersive spectroscopy, the drop of the die-shear strength during the thermal cycling was attributed to the pile-up of creeping dislocations to form microcavities at the grain boundaries of the sintered silver 相似文献
18.
19.
搭建了输出特性测试电路、漏电流测试电路、双脉冲测试电路和Buck电路,对1 200 V SiC MOSFET和Si IGBT的输出特性、漏电流、开关特性和器件损耗进行了对比研究,分析了SiC MOSFET的主要优缺点。分析结果表明,SiC MOSFET在高温条件下依然拥有稳定的阻断能力;在同样的工作条件下,SiC MOSFET损耗更小,适合在高频率、大功率场合下使用;SiC MOSFET的跨导低,导通电阻大,所以门极驱动电压需要比较大的摆幅(-5/+20 V);由于开关速度很快,SiC MOSFET对线路杂散参数更加敏感。 相似文献