共查询到16条相似文献,搜索用时 711 毫秒
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基于Arrhenius模型快速评价功率VDMOS可靠性 总被引:2,自引:0,他引:2
基于Arrhenius模型,对功率器件垂直导电双扩散(VDMOS)场效应晶体管的可靠性进行了评价,并对其主要失效机理进行了分析.通过样管在不同结温下的恒定温度应力加速寿命实验,利用Arrhenius方程和最好线性无偏差估计法(BLUE)对结果进行数据处理,得到其失效激活能E=0.54 eV,在偏置VDs=7.5 V,IDs=0.8 A,推导出功率VDMOS在室温下工作的寿命特征值为3.67×106 h.失效分析发现,栅极累积失效是影响功率VDMOS漏源电流,IDs退化的主要失效机理. 相似文献
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MD系列是日本新电元工业公司开发的DC/DC变换器用功率IC.在电源的分散化和小型化要求日益迫切的今天,除了需要减小DC/DC变换器用功率IC的外形尺寸之外,外接部件的数量和尺寸也需要压缩.MD系列就是满足上述要求的降压削波型(Chopper Type)DC/DC变换器用功率IC.其电路构成简单,内藏控制IC和功率器件,外接部件仅电感和电容等. 相似文献
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In order to reduce the volume, weight and cost of conventional hybrid energy storage system (HESS) while properly exploring the complementary features of different energy storage devices for DC microgrid applications, this paper proposes a multiple-port three-level DC/DC converter. It possesses multiple ports sharing one front-end three-level DC/DC converter with an inductor and supercapacitor bank. Different types of batteries and/or multiple battery banks can be interfaced through the multiple terminals. Such a converter structure facilitates the cooperation of different energy storage devices to satisfy various power demands of DC microgrids with intermittent renewable generation plants. Moreover, the proposed structure allows power sharing among different energy storage devices, which enables more efficient cooperation of different battery banks or different types of batteries. Experimental results are presented to verify the efficacy of the proposed converter structure and its control. 相似文献
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E. Marcault M. Breil A. Bourennane P. Tounsi J.-M. Dorkel 《Microelectronics Reliability》2012,52(3):489-496
Reliability is a major economic and technical challenge for power electronics dedicated to embedded applications (avionics, automotive, hybrid vehicles, etc.). As the damage in a power assembly is essentially due to thermo-mechanical stress resulting from temperature variations (ambient and junction) [1], industrial actors ask for integrated devices allowing anticipation of the failure by monitoring temperature and mechanical stress. Power devices I(V) characteristics depend on the mechanical stress. Hence, one can make use of this dependence to assess the mechanical stress values from the electrical characteristics of the device. The extracted mechanical stress values give information on the mechanical state of the power module that one could exploit to anticipate failure. To study the impact of the mechanical stress on the I(V) characteristics, we carry out mechanical simulations using a finite element method (FEM) simulator (COMSOL) for a simple 2D power assembly to calculate the mechanical stress at different temperatures as well as the mechanical stress due to an external strain. The calculated values are then fed into a FEM physical device simulator (Sentaurus TCAD) to determine the electrical characteristics of a VDMOS device at different temperatures. A dissociation of mechanical stress and thermal effects on the VDMOS I(V) characteristics would make it possible to have a graphical representation that could be used to have a quick estimate of the mechanical state of the power VDMOS through its electrical characteristics. 相似文献
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《Microelectronics Reliability》2014,54(9-10):1833-1838
In this paper a 3-D electrothermal (ET) analysis of a DC–DC parallel resonant converter (PRC) for constant current (CC) application is presented. A full 3-D ET simulation approach is proposed at application level to provide a support for the design stage and to analyse possible fault conditions inside the active devices. Simulations and measurements have been performed on a 100 W–2 A prototype of a PRC-CC circuit with 80 kHz nominal switching frequency.In particular, in the reported case study, the analysis has been focused on the full-bridge section of the circuit in order to prove the effect of the soft switching operation, introduced by the resonant technique, and consider the effect of possible fault conditions. To this purpose an unexpected short-circuit condition on a power MOSFET composing the H-bridge is considered, to evaluate the ET circuit behaviour and the time-to-failure of the power section. Considerations are carried out in terms of minimum requirements of protection circuits which must be fulfilled in order to avoid catastrophic system failure.A second power converter, rated for 1.5 kW, has been then designed, based on the same circuital topology, and an ET simulation has been performed in order to carry out considerations on the effect of mismatches among the input bridge devices. 相似文献
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Bor-Ren Lin 《International Journal of Electronics》2018,105(4):679-693
This paper presents a zero-voltage switching DC/DC converter for DC micro-grid system applications. The proposed circuit includes three half-bridge circuit cells connected in primary-series and secondary-parallel in order to lessen the voltage rating of power switches and current rating of rectifier diodes. Thus, low voltage stress of power MOSFETs can be adopted for high-voltage input applications with high switching frequency operation. In order to achieve low switching losses and high circuit efficiency, asymmetric pulse-width modulation is used to turn on power switches at zero voltage. Flying capacitors are used between each circuit cell to automatically balance input split voltages. Therefore, the voltage stress of each power switch is limited at Vin/3. Finally, a prototype is constructed and experiments are provided to demonstrate the circuit performance. 相似文献