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近年来,电磁式汽车发电机电压调节器正逐步被性能明显具有优势的电子式电压调节器所取代。电子电压调节器也经过了从分立元件到分立元件与集成电路相结合、再到集成开关器件、最后至智能集成开关器件几个发展阶段。本文基于性能价格比的考虑,选择了用TWH8778半智能型集成功率开关实施制作电子电压调节器,经300W汽车发电机试验后,效果良好。 相似文献
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MC33092是motorola公司生产的汽车专用交流发电机稳压器,它能在汽车行驶过程中对汽车的交流发电机充电系统实施良好的电压调整和负载控制,并具有欠压、过压、相位故障和负载断开保护功能,文中介绍了MC33092的主要性能和工作原理。并给出了具体的应用电路。 相似文献
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由于补偿脉冲发电机集惯性储能、机电能量转换和脉冲成形的综合技术优势,研制了一台额定转速为12 000 r/min的20 MJ补偿脉冲发电机,并研究了其中关键材料包括屏蔽筒和转轴等的选择。在理论计算和仿真分析的基础上设计了电机励磁回路以及电枢绕组,提出了一种新的补偿绕组结构即定子上安放两套电枢绕组,在电机放电时,脉冲电流将会提高,绕组的温度会降低,磁场密度会增强。 相似文献
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Alix L. Paultre 《今日电子》2003,(3):2-2
现在人们对电能的需求有着非常显著的增长,尤其是在轻型汽车方面,通过电子系统来替代机械功能,可以提高每单位燃料的行驶里程数、可靠性和安全性能。位于美国加利福尼亚州El Segundo的国际整流器公司(InternationalRectifier)推出的有源集成整流器调节装置(Active Integrated Rectifier Regulator简称AIRR)是一种能够满足下一代汽车的新设计,它能够在一个比传统的无源整流器和交流发电机外型尺寸小得多的空间内产生很大的动力能量。在同一模块容纳了一个具有有源整流器的稳压器,对于一台标准的交流发电机来说,该装置在空载时比… 相似文献
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汽车的实体展示主要是依托汽车展厅来实现的,但通过展厅的方式在实际展示中存在空间、时间、地域的限制及成本高昂等问题。随着虚拟现实技术的快速发展,文章使用3DMax来制作汽车模型,利用Unity3D虚拟开发平台来完成各种元素的整合、材质光效的制作、运动动画的实现以及人车交互效果的达成,从而设计一款汽车虚拟展示系统。该系统可以弥补汽车展厅存在的各种不足,使用户获得更好的感观体验。 相似文献
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汽车需要成熟的电源管理系统以维持较高的燃料效率,改善性能和增加电气负载。与该系统整合的电力电子技术必须在很宽的温度范围内是可靠的。同时,其成本还必须与汽车制造商的价格目标相容。用电力电子模块来管理车辆的交流发电机系统能满足上述要求。 相似文献
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Mirko Klein Altstedde Frank Rinderknecht Horst Friedrich 《Journal of Electronic Materials》2014,43(6):2134-2140
Because the heat emitted by conventional combustion-engine vehicles during operation has highly transient properties, automotive thermoelectric generators (TEG) are intended for a particular operating state (design point). This, however, leads to two problems. First, whenever the combustion engine runs at low load, the maximum operating temperature cannot be properly utilised; second, a combustion engine at high load requires partial diversion of exhaust gas away from the TEG to protect the thermoelectric modules. An attractive means of stabilising dynamic exhaust behaviour (thereby keeping the TEG operating status at the design point for as long as possible) is use of latent heat storage, also known as phase-change materials (PCM). By positioning PCM between module and exhaust heat conduit, and choosing a material with a phase-change temperature matching the module’s optimum operating temperature, it can be used as heat storage. This paper presents results obtained during examination of the effect of integration of latent heat storage on the potential of automotive TEG to convert exhaust heat. The research resulted in the development of a concept based on the initial integration idea, followed by proof of concept by use of a specially created prototype. In addition, the potential amount of energy obtained by use of a PCM-equipped TEG was calculated. The simulations indicated a significant increase in electrical energy was obtained in the selected test cycle. 相似文献
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New developments in the field of thermoelectric materials bring the prospect of consumer devices for recovery of some of the waste heat from internal combustion engines closer to reality. Efficiency improvements are expected due to the development of high-temperature thermoelectric generators (TEG). In contrast to already established radioisotope thermoelectric generators, the temperature difference in automotive systems is not constant, and this imposes a set of specific requirements on the TEG system components. In particular, the behavior of the TEGs and interface materials used to link the heat flow from the heat source through the TEG to the heat sink must be examined. Due to the usage patterns of automobiles, the TEG will be subject to cyclic thermal loads, which leads to module degradation. Additionally, the automotive TEG will be exposed to an inhomogeneous temperature distribution, leading to inhomogeneous mechanical loads and reduced system efficiency. Therefore, a characterization rig is required to allow determination of the electrical, thermal, and mechanical properties of such high-temperature TEG systems. This paper describes a measurement setup using controlled adjustment of cold-side and warm-side temperatures as well as controlled feed-in of electrical power for evaluation of TEGs for application in vehicles with combustion engines. The temperature profile in the setup can be varied to simulate any vehicle usage pattern, such as the European standard driving cycle, allowing the power yield of the TEGs to be evaluated for the chosen cycle. The spatially resolved temperature distribution of a TEG system can be examined by thermal imaging. Hotspots or cracks on thermocouples of the TEGs and the thermal resistance of thermal interface materials can also be examined using this technology. The construction of the setup is briefly explained, followed by detailed discussion of the experimental results. 相似文献
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SHA1 IP的设计及速度优化 总被引:1,自引:0,他引:1
论文简要介绍了SHA1算法的基本流程,并给出了一种硬件实现方案,文中着重介绍了提高IP的工作速度所采用的三种速度优化方案,并在文章的最后对速度优化的结果进行了比较,可以看出通过优化IP的工作速度得到了显著的提高。 相似文献
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在超大规模集成电路的设计过程中,库单元绑定是非常重要的一环。它的目标是:通过特定的方法,把一组布尔网络表述的逻辑功能用具体的库单元实现。逻辑分解是这一过程中非常重要的一步,经分解产生的主题图质量的好坏直接影响到最后的设计结果。针对主题图中的延时问题,提出了“再分解”这一新设计方法。该方法采用“逻辑变换”技术,使主题图中从基本输入到基本输出的各条线路延时的差距尽是缩小,从而达到减小整个主题图延时的目的。 相似文献
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汽车电子系统设计人员在选择MOSFET器件时以前只有两种选择:没有任何保护措施的“简单”PowerMOS或具有完全保护的器件,后者在环境条件超出规定范围时会自动关闭,然而带有额外逻辑和保护电路的完全保护器件成本较高。因此,有些供应商开发了一种介于两者之间的适度集成的新型器件,在单芯片中结合了TrenchMOS技术以及温度和电流传感元件。其优点是不需要昂贵的智能功率器件即可为系统提供保护并节约空间。 相似文献
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