优化P-i-N功率二极管热可靠性:仿真与实验证明

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该篇论文《提高P-i-N功率二极管温度性能的仿真和实验研究》由中国科技论文在线发布,作者贾云鹏、吴郁和胡东清,他们来自北京理工大学电子信息与控制工程学院。该研究得到了中国博士研究生教育专项基金的支持(编号:20111103120016)。贾云鹏博士自2002年起专注于电力半导体领域,其电子邮件地址为jyp@bjut.edu.cn。 论文的核心内容聚焦于现代P-i-N功率二极管的温度特性研究。通过理论推导,作者证明了在电流-电压特性(IV特性)中,存在一个转折点,即温度系数TK(温度对电流的影响)在此处发生反转。通常情况下,P-i-N二极管的正向压降(Vf)具有负温度系数,但在特定的电流区域,研究发现可能存在正温度系数的现象。 为了深入探究这一现象,作者利用半导体器件模拟技术来分析影响温度系数TK的各种参数。通过仿真和实验相结合的方法,研究结果显示,当P-i-N功率二极管工作在特定电流范围内时,正向电压降的温度响应可以转变为正值,这可能对二极管的热可靠性产生积极影响。 这项研究对于优化功率二极管在高温环境下的性能具有重要意义,因为它揭示了温度系数非线性变化的可能性,并为设计者提供了新的策略来减小温度对器件性能的影响。理解并控制这种反转行为,有助于提高电力电子设备的整体效率和稳定性,尤其是在高温工作条件下,如数据中心、电动汽车充电系统等领域中的应用。因此,这项工作不仅扩展了我们对P-i-N二极管基本特性的理解,也为实际应用中的故障预测和热管理提供了宝贵的科学依据。

用中文总结以下内容: A number of experimental and numerical investigations have been conducted to study the MBPP stack and wavy flow field characteristics with various designs [10,11]. T. Chu et al. conducted the durability test of a 10-kW MBPP fuel cell stack containing 30 cells under dynamic driving cycles and analyzed the performance degradation mechanism [12]. X. Li et al. studied the deformation behavior of the wavy flow channels with thin metallic sheet of 316 stainless steel from both experimental and simulation aspects [13]. J. Owejan et al. designed a PEMFC stack with anode straight flow channels and cathode wavy flow channels and studied the in situ water distributions with neutron radiograph [14]. T. Tsukamoto et al. simulated a full-scale MBPP fuel cell stack of 300 cm2 active area at high current densities and used the 3D model to analyze the in-plane and through-plane parameter distributions [15]. G. Zhang et al. developed a two-fluid 3D model of PEMFC to study the multi-phase and convection effects of wave-like flow channels which are symmetric between anode and cathode sides [16]. S. Saco et al. studied the scaled up PEMFC numerically and compared straight parallel, serpentine zig-zag and straight zig-zag flow channels cell with zig-zag flow field with a transient 3D numerical model to analyze the subfreezing temperature cold start operations [18]. P. Dong et al. introduced discontinuous S-shaped and crescent ribs into flow channels based on the concept of wavy flow field for optimized design and improved energy performance [19]. I. Anyanwu et al. investigated the two-phase flow in sinusoidal channel of different geometric configurations for PEMFC and analyzed the effects of key dimensions on the droplet removal in the flow channel [20]. Y. Peng et al. simulated 5-cell stacks with commercialized flow field designs, including Ballard-like straight flow field, Honda-like wavy flow field and Toyota-like 3D mesh flow field, to investigate their thermal management performance [21]. To note, the terms such as sinusoidal, zig-zag, wave-like and Sshaped flow channels in the aforementioned literatures are similar to the so called wavy flow channels in this paper with identical channel height for the entire flow field. The through-plane constructed wavy flow channels with periodically varied channel heights are beyond the scope of this paper [22,23].

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