电子线路多媒体课件的制作设计与实现

介绍电子电路多媒体课件制作的总体思路,描述以Authorware为主要制作工具制作《电子线路》中“固定偏置电路”与“多级放大电路”课件的过程,并时制作过程中遇到的重点难点问题的解决做详细介绍。     

基于CFD软件的电力电子设备强制风冷散热的数值模拟

随着电力电子技术的发展,对电力电子设备散热问题的研究日益重要。该文运用CFD软件对电力电子设备的强制风冷散热进行数值模拟研究,得出简单可行的散热方案,为设备的散热设计提供一定的依据,提高设备的可靠性。     

Power electronics as efficient interface in dispersed power generation systems

The global electrical energy consumption is rising and there is a steady increase of the demand on the power capacity, efficient production, distribution and utilization of energy. The traditional power systems are changing globally, a large number of dispersed generation (DG) units, including both renewable and nonrenewable energy sources such as wind turbines, photovoltaic (PV) generators, fuel cells, small hydro, wave generators, and gas/steam powered combined heat and power stations, are being integrated into power systems at the distribution level. Power electronics, the technology of efficiently processing electric power, play an essential part in the integration of the dispersed generation units for good efficiency and high performance of the power systems. This paper reviews the applications of power electronics in the integration of DG units, in particular, wind power, fuel cells and PV generators.     

An overview of electric vehicle technology

An overview of the present status and future trends in electric vehicle technology is provided. The emphasis is on the impact of rapid development of electric motors, power electronics, microelectronics, and new materials. Comparisons are made among various electric drive systems and battery systems. The market size of electric vehicles in the coming years and the potential electric vehicle impacts are discussed     

绝缘栅双极晶体管(IGBT)及其应用

绝缘栅双极晶体管(IGBT)是电力电子技术中的关键器件。本文介绍了IGBT国内外发展简况,较详细地说明了IGBT的重要特性及其应用基础技术,列出了在家用电器、电焊机、电动机等方面应用的一些基本电路。     

电子设备通用故障的检测方法与技术

由各种电子元器件组成单元电路,由许多个单元电路组成具有特定功能的电路系统就是电子设备。当整个系统不能正常工作时,或达不到其主要性能指标时,说明有的单元电路出现了故障,需要我们检测出故障所在。     

模拟电路故障的诊断及测试技术

模拟电路故障的存在,会严重影响电子设备的正常工作,模拟电路故障的发生,具有一定的特征和规律。对于电子电路故障的分析、诊断和测试,就是分析故障特点,准确查找故障。     

联协研发电动汽车最佳结构的四大基础部件以赶超世界领先

综合汽车、电机、控制、交通及其技术经济多学科的五大理论,经完备的深入分析研究,提出了可极大提高电动汽车驱动、制动和转向三大执行机构快速响应性及其性价比,和基于四大基础部件的电动汽车最佳结构的五项发明专利;优化电动汽车性能和交通管理来综合解决汽车引起的能源危机、环境污染、交通事故、道路拥堵四大负面效应;结合国情和现有技术分析了适于普及的节源环保型电动微轿车,提出尽快商品化的研发模式。为此需整合重组新汽车产业链通过联合协作攻关以赶超世界领先,从而带动国民经济腾飞,以此振兴中华。     

电子设备电路的调试方法与技巧

在电子设备的使用过程中,电路的调试占有重要地位,这是理论联系实际的重要环节。电路只有通过了调试,各项性能指标都能够满足要求,电子设备才能正常的工作,因此我们应该重视电路的调试工作,以及调试过程中的技巧。     

电子电路的设计技术

电子电路的设计,在电子类课程的理论联系实际过程和实践教学中,非常重要,必须重视。     

汽车电子设备努力实现省电

汽车附件和电子控制设备受益于电源管理方案,从而防止蓄电池电量耗尽和高油耗。低功率电子子系统对于下一代电动轿车和插电式电动汽车尤其重要。     

Power Electronics and Motor Drives in Electric, Hybrid Electric, and Plug-In Hybrid Electric Vehicles

With the requirements for reducing emissions and improving fuel economy, automotive companies are developing electric, hybrid electric, and plug-in hybrid electric vehicles. Power electronics is an enabling technology for the development of these environmentally friendlier vehicles and implementing the advanced electrical architectures to meet the demands for increased electric loads. In this paper, a brief review of the current trends and future vehicle strategies and the function of power electronic subsystems are described. The requirements of power electronic components and electric motor drives for the successful development of these vehicles are also presented.     

Parallel readout of two-element CdZnTe detectors with real-time digital signal processing

Readout electronics,especially digital electronics,for two-element CdZnTe(CZT) detectors in parallel are developed.The preliminary results show the detection efficiency of the two-element CZT detectors in parallel with analog electronics is as many as 1.8 and 2.1 times the single ones,and the energy resolution(FWHM) is limited by that of the single one by the means of analog electronics.However,the digital method for signal processing will be sufficiently better by contrast with an analog method especial...     

基于数字信号处理方式读出二元并行CdZnTe探测器输出信号

本文中介绍了二元并行CdZnTe探测器的读出电子线路,特别是用于信号处理的数字电路。结果显示用模拟电路方法测得二元并行探测器的探测效率分别是单元探测器的1.8和2.倍,但能量分辨率被限制了。然而对于能量分辨率的测试结果,数字方法得到的结果比模拟方法得到的好很多,提高了26.67%,同时探测效率却没有见效。导致这一区别的原因文中也做了相应的讨论。     

An observation on the Sommerfeld-integral representation of theelectric dyadic Green's function for layered media

The authors discuss the electric dyadic Green's function for layered dielectrics. It is known that for the free-space electric dyadic Green's function, evaluation of the electric field at observation points within the source region requires specification of a principal volume along with the corresponding depolarizing dyad. Special considerations are invoked for layered background media which are appropriate for the electromagnetics of integrated electronics. It is shown that use of the Sommerfeld-integral representation of the electric dyadic Green's function leads to an innate choice for the depolarizing dyad. A corresponding principal volume is subsequently identified; it is demonstrated that there exists an alternative choice for this excluding region which leads to the same depolarizing dyad     

A high-efficiency electromechanical battery

The electromechanical battery (EMB) is considered as an alternative energy storage system for electric utilities and other applications. An EMB is a modular unit consisting of an evacuated housing containing a fiber-composite rotor. The rotor is supported by magnetic bearings and contains an integrally mounted permanent magnet array. Recent developments in high-strength fibers, in permanent-magnet materials, and in solid-state power electronics allow the design of small (1 kW-h) modular EMBs for full-or hybrid-electric vehicles, and larger size modules (25 kW-h) for a variety of stationary storage needs. Design issues for EMBs with rotors made up of nested cylinders are addressed. Rotational stability, stress distributions, generator/motor power and efficiency, power conversion, and cost are discussed. It is concluded that the use of EMBs in electric autos could result in a fivefold reduction (relative to the IC engine) in the primary energy input required for urban driving, with a concommitant major positive impact on the economy and on air pollution     

Highly Stretchable or Transparent Conductor Fabrication by a Hierarchical Multiscale Hybrid Nanocomposite

As is frequently seen in sci‐fi movies, future electronics are expected to ultimately be in the form of wearable electronics. To realize wearable electronics, the electric components should be soft, flexible, and even stretchable to be human‐friendly. An important step is presented toward realization of wearable electronics by developing a hierarchical multiscale hybrid nanocomposite for highly flexible, stretchable, or transparent conductors. The hybrid nanocomposite combines the enhanced mechanical compliance, electrical conductivity, and optical transparency of small CNTs (d ≈ 1.2 nm) and the enhanced electrical conductivity of relatively bigger Ag nanowire (d ≈ 150 nm) backbone to provide efficient multiscale electron transport path with Ag nanowire current backbone collector and local CNT percolation network. The highly elastic hybrid nanocomposite conductors and highly transparent flexible conductors can be mounted on any non‐planar or soft surfaces to realize human‐friendly electronics interface for future wearable electronics.     

Work on refining thermionic diodes

Scientists at the Massachusetts Institute of Technology are working on a thermal diode that can turn heat into electric current. This could harness heat from a car engine, providing power for the electronics, or recharge laptop batteries by recycling a computer's micro-processor thermal output.     

Triboelectric Nanogenerator Boosts Smart Green Tires

Tires are important parts in creating a great transportation system because they can significantly improve the overall system safety and fuel/power efficiency. The latter is especially important for the mileage of electric vehicles due to the limited electrical storage capacity. Here, green energy tires are designed by incorporating silica tread rubber with triboelectric nanogenerators (TENGs). On the one hand, the silica‐based tread compound sharply cuts off the rolling resistance, improves fuel efficiency and reduces CO₂ emissions, and provides all‐around traction without compromising braking. On the other hand, TENG converts frictional energy into electricity without changing the process of traditional tire production, which is able to be used for powering the electronics for automobile safety and automeasuring of tire pressure. The most important point lies in that TENG helps harness static electricity, which at present hinders the large‐scale application of silica‐filled green tires. Interestingly, it is also able to measure tire pressure and road condition from the changes in the output electrical signals, which thus leads to the smart applications of green energy tire in road/tire condition monitoring.     

集成专用驱动器在开关电源中的应用

介绍了开关电源中驱动部分的工作情况,集中说明了栅极专用驱动器IR2110的使用方法及其抗干扰措施。由于IR2110本身的缺陷,常规使用方法只能适合小功率场合,在中大功率场合根本无法使用。然而IR2110这款芯片具有较高的性价比,他完全可以驱动上千瓦的功率管。通过对IR2110芯片内部结构的了解和分析,得到几种新的外围电路,实验结果比较令人满意,介绍几种用于大功率场合的方法。