DC 600V在铁路空调客车供电系统的应用

简要的回顾了铁路空调客车的供电方式.重点介绍空调客车DC 600 V供电系统,并介绍了DC 600 V供电系统在运用中存在的主要问题并提出解决的方法.     

IGBT在客车DC 600 V系统逆变器中的应用与保护

简要介绍绝缘栅极晶体管(IGBT)的结构、特点及其在铁路供电系统中的应用.重点讨论IGBT模块在铁路客车DC 600V供电系统逆变器中的应用与保护.IGBT模块具有损耗小,便于组装,开关转换均匀等优点.应用结果表明,IGBT模块有过压、欠压保护,过流、过栽、过热等保护功能,保证DC 600 V供电系统安全、可靠地运行.     

IGBT在客车DC600V系统逆变器中的应用与保护

简要介绍绝缘栅极晶体管（IGBT）的结构、特点及其在铁路供电系统中的应用。重点讨论IGBT模块在铁路客车DC600V供电系统逆变器中的应用与保护。IGBT模块具有损耗小。便于组装,开关转换均匀等优点。应用结果表明,IGBT模块有过压、欠压保护,过流、过载、过热等保护功能,保证DC600V供电系统安全、可靠地运行。     

25T型空调客车DC600V/DC110V8kW充电系统应用研究

分析25T型空调客车DC600V/DC110V 8 kW充电系统的组成,重点研究充电系统的PWM高频桥式整流电路和DC/DC电压变换电路的特点、实现方法和保护,阐述充电系统、保护系统的工作过程,分析表明,该充电系统达到国内先进水平.     

综合控制柜直流漏电问题的分析和解决

本文介绍了DC600V供电客车漏电报警装置的工作原理,从原理分析入手,对现车出现的漏电流超标问题进行研究和查找,并提出了切实可行的解决方案。     

客车DC600V供电电源主电路的设计

为了提高客车DC600 V供电电源的功率因数,减小输出电压的波动,对主电路提出了基于"二极管不控整流+IGBT降压斩波"的设计。通过对主电路的PSIM仿真,表明该电路能够大幅提高DC600 V电源的功率因数,而且使输出电压稳定在600 V左右,达到了设计目的,能满足对客车供电的质量需求,保证用电设备的正常工作。     

机车供电系统漏电流检测及改进

对电力机车DC600V供电系统漏电流的问题进行分析研究。通过现场的高压试验验证,寻找漏电流检测方案并进行改进。     

客车不间断电源装置研制

简要介绍了新型3AC380V列车供电系统的发展过程,重点阐述了客车不间断电源装置的结构和特点。以此设计的客车不间断电源装置在实际的工程应用中得到了验证。     

DC-DC变换器的输入系统不稳定性

本文简要介绍了直流分布式供电系统中DC—DC变换器输入系统不稳定性的产生原因，提出了两种解决系统不稳定性问题的方法、并给出了参数计算公式。     

高端路由器供电系统的设计

本文介绍了分布式供电系统和三种基本的板上DC/DC转换器的结构,分析了其优缺点,在此基 础上提出了一台高端路由器供电系统的设计方案,并给出了电源设计框图。     

电子风扇专用无刷直流电机关键技术的研究

为了解决客车、城市公交车在实际使用中发动机不同温度状况下的散热问题,有效地保证发动机的正常使用温度,车载电子风扇是最佳选择。指出了电子风扇专用无刷直流电机控制电路的一些注意事项,结合具体实验,优化电路中元器件的参数,很好地保证电机稳定正常运行。     

Vertical-vibration control of elevator using estimated caracceleration feedback compensation

In this paper, a vibration suppression strategy is proposed for improving the riding comfort of an elevator, using car acceleration feedback compensation. The vertical vibration of a lift car is mainly caused by the resonance of elastic ropes between the car and the sheave, and the resonant frequency of the system is dependent upon both passenger load and lift position. To suppress the vibration of a lift car, the car velocity or acceleration is needed, but only a sheave velocity is measurable in a practical situation. The proposed method applies an extended full-order observer for the simultaneous estimation of car acceleration and the identification of mechanical parameters. Acceleration feedback compensation is used for the vibration suppression control. Experimental evaluation has been performed with a 30 kVA insulated gate bipolar transistor inverter and a medium-speed elevator system in an elevator test tower. Computer simulated and experimental results prove the feasibility of the proposed vertical-vibration controller     

Powering up-a higher system voltage for cars

The author briefly describes the history of vehicle electrical system voltages. The electrical loads within a car are likely to increase in the future so a higher voltage will be necessary. The author points out that the optimum choice of voltage involves trade-offs between cost, safety, economy performance and function. The obvious choice is 24 V, which is used in commercial vehicles. The author discusses the use of this and higher voltages and whether AC or DC systems should be used     

Zero-voltage-zero-current switching in high-output-voltagefull-bridge PWM converters using the interwinding capacitance

A novel zero-voltage and zero-current-switching (ZVZCS) full-bridge (FB) pulsewidth-modulated (PWM) power converter is proposed. The new converter uses the interwinding capacitance and a small primary-side inductor to achieve a zero-current-zero-voltage turn off and a zero-current turn on of the passive-to-active leg transistors. The turn off of the active-to-passive leg transistors is with zero voltage, and the turn on is with zero voltage and zero current across them. The ringing caused by the parasitic interwinding capacitance and by the reverse recovery of the rectifiers is reduced. The new converter is attractive for high-output-voltage applications (600-1000 V), where the interwinding capacitance is sufficiently dominant. In addition, switches such as insulated gate bipolar transistors (IGBTs) and MCTs can be used at higher frequencies which is particularly desirable for high-power application (above 2 kW). The experimental results obtained from an IGBT-based 62.5-kHz DC/DC power converter with a rated output voltage of 600 V and a nominal power of 1.2 kW are presented     

基于瑞萨单片机自动寻迹智能车的设计

以瑞萨超级MCU模型车大赛为背景,设计并实现了一种智能车自动寻迹系统。采用瑞萨16位微控制器H8/3048F作为核心控制单元,使用光电对管RPR220采集路面信息,自动控制舵机转向,并对直流电机转速进行PID调节,从而实现智能车稳定、快速的行驶。实验结果表明,该套设计方案简单可靠,具有良好的控制性,满足设计要求。     

Field test results of a semi-active ER suspension system associated with skyhook controller

Performance characteristics of a semi-active ER (electro-rheological) suspension system are evaluated through the field test of a passenger car. Four ER shock absorbers are designed and manufactured for both front and rear parts, and their field-dependent damping properties are investigated. Subsequently, four independent skyhook controllers associated with ER shock absorbers are formulated by considering the vertical motions of the body and wheel of the car to be tested. Both ride comfort and steering stability of the car are evaluated via the field test showing bump and squat test responses.     

大功率车载交流电源的设计与研究

针对解决载有交流电动机的电动车车载电源的直交流电压转换问题,本论文在分析了逆变器结构和原理的基础上,提出了DC-DC-AC的设计思路,采用高频变压器、PWM和SPWM技术搭载控制电路,将车载48 V铅酸电池电压升压,再经过逆变,得到纯正弦交流电压;同时本论文给出了高频变压器和滤波电路的参数选定方法。最后实验结果表明48 V铅酸电池经过升压和逆变,可输出频率为50 Hz,幅值为220 V的纯正弦交流电压;同时实物电路具有体积小、设计成本低、输出交流电压稳定、带载能力强的良好性能。     

智能公交车载下位机与调度监控中心上位机功能设计

智能公交系统信息交互传递是否顺畅取决于系统主要模块的功能设计.本文主要对智能公交车载下位机和调度监控中心上位机进行功能设计,车裁下位机功能设计主要进行无线通讯模块、客流量检测模块、键盘输入模块、屏幕显示模块的功能设计;调度监控中心上位机功能设计主要进行LabVIEW通信模块和调度中心监控界面设计.本设计使得智能公交车载...