一种高稳定性多功能氘灯恒流电源的研制

本文介绍了一种高稳定性多功能的氘灯恒流电源,其电流调整率达到6.5×10~(-6),漂移达到5.0×10~(-5)/hr。它具有多功能的特点,既可满足各类氚灯使用的供电要求,又可满足各类氘灯科研和生产工作中测试工作的要求;既可与使用氘灯(或氢灯)作光源的各类光学式分析仪器(如紫外光谱仪、HPLC、FIA等仪器)配套,又可单独使用在需要50～450mA直流恒流电源的各类仪器装置中。文中简单介绍了该恒流电源的电路结构、工作原理、主要技术指标。并对几个有关的问题进行了初步探讨。     

A power supply unit for discharging the plasma electron source

A power supply unit for discharging a low-temperature plasma generator based on discharge in the crossed electric and magnetic fields is described. The unit operates in a stationary mode with a preset stabilized (±2%) discharge current of up to 0.5 A and in a pulse mode (up to 20 A), taking into account special features of powering gas discharges.     

A Power-Supply Unit for Pulsed Lasers without a Storage Capacitor

A power-supply unit for pulsed lasers that are pumped by low- and medium-power flashlamps with long pump pulses that does not require a capacitive storage unit is described. The pump-pulse duration is limited by the radiation and thermal stability of the active elements and pump lamps. A functional diagram of the power-supply unit and a circuit diagram of its power system are presented. The basic parameters and elements of this unit, as well as the results of using a laser with the described power supply in experiments, are presented.     

A Computerized System for Controlling the Wavelength of a High-Power Dye Laser

A system for the rotation of a dispersive laser element with a stepper motor is described. The motor is controlled by a personal computer that can be located at a distance of more than 20 m from the motor. The stepper control unit is connected to the computer interface board by a twin line. The system ensures highly reliable operation under conditions of intense electromagnetic noises from the laser power supply system due to the use of noise-suppressing differential transmission lines and optoelectronic isolators.     

基于ADuC834单片机的高精度电压监测系统

为准确、高效、实时地对缓变电压或电流信号进行长时间监测,研制了一种基于单片机的高精度电压监测系统。利用ADuC834单片机作为数据采集电路的主要部件,并将采集的数据以串行通讯方式传输至上位机,供上位机显示和处理,从而实现对两路电压信号的高精度、实时监测。将此系统应用于某型高精度激光陀螺两臂电流波动的监测,达到了很高的精度,此系统亦可应用于其他需要实时高精度监测电压或电流的领域。     

嵌入式技术在花样缝纫机控制系统中的应用

针对花样缝纫机的智能化控制问题,综合应用ARM、DSP、FPGA等嵌入式技术,开发花样缝纫机智能化控制系统.该智能化控制系统由嵌入式ARM主板、基于DSP+FPGA的运动控制卡、带触摸功能液晶屏、主轴伺服驱动单元、进给轴驱动单元、输入/输出信号接口、系统电源等组成,可实现对花样缝纫机的高速、高精度运动控制.应用结果证明...     

用于电机的VMOSFET驱动电源

论述采用N沟道VMOS开关管构成的功率步进电动机驱动电源的设计,给出了电源中的斩波限流电路和调频调压电路.实验证明,该新型驱动装置的运行频率、矩频特性、效率等明显优于同类产品.     

电力电缆分布式测温系统取能电源研究

供能电源一直是电力电缆和输电线路在线监测系统亟待解决的关键问题.分析了现有供能电源存在的不足,设计了一种电力电缆分布式测温系统的取能电源.该电源根据电磁感应原理,利用带气隙的线圈从高压电缆感应取能,并通过电源管理单元和充电管理单元,将电缆电流转变为稳定的输出电压,为分布式测温系统供能.基于此,通过理论分析和软件仿真,实现对取能线圈结构参数最优匹配,满足实际线路需要;通过电源管理单元和充电管理单元,有效解决了电源续航能力和输出电压稳定性问题.实验结果表明,该取能电源能够为电力电缆分布式测温系统提供足够的能量,满足可靠性要求.     

A power supply for simulating lightning-current pulses

The circuit diagram of a power-supply unit for simulating a positive lightning on a system of grounding current pulses is presented. The main criteria that governed the development of this facility are expounded. The design and order of operation of an experimental specimen of a power supply developed at the VNIIEF on the basis of a BMΓ-320 cascade magnetic-cumulation generator are considered. A calculation technique is described with which a device for the formation of current pulses of up to 90 kA in a standard grounding system has been developed.     

Low noise constant current source for bias dependent noise measurements

A low noise constant current source used for measuring the 1∕f noise in disordered systems in ohmic as well as nonohmic regime is described. The source can supply low noise constant current starting from as low as 1 μA to a few tens of milliampere with a high voltage compliance limit of around 20 V. The constant current source has several stages, which can work in a standalone manner or together to supply the desired value of load current. The noise contributed by the current source is very low in the entire current range. The fabrication of a low noise voltage preamplifier modified for bias dependent noise measurements and based on the existing design available in the MAT04 data sheet is also described.     

一种DC-DC直流稳压电源及漏电保护装置的设计

利用稳压块TL430、TIP127大功率三极管等分离元件构成一种输入电压范围宽、输出电压为+5 V的DC-DC直流稳压电源。通过MSP430F149单片机实现输出电流、漏电流、输出电压和功率的测量,并根据漏电流大小能自动切断电压输出实现保护,具有测量精度高、漏电保护灵敏的特点。     

A function integrated and intelligent mechanical interface for small modular machine tools

A modular structure is essential for versatile, reconfigurable micro machine tools to meet future requirements and to achieve flexibility. Therefore, to exploit modularity, the design of a function integrated, intelligent mechanical interface is presented in this paper. The interface is based on a six-point mounting and a switchable permanent magnet system guaranteeing high precision. Thus, various machine tool modules can quickly be coupled to functioning units without tools and further adjustments. Energy supply, information transfer and data processing are also incorporated, without diminishing precision. The interface characteristics are analytically described. Simulation and experiments show performance and feasibility for micro manufacturing.     

空间激光通信精跟踪单元的高精度快速PZT驱动技术研究

为保证空间激光通信的顺利进行,精跟踪系统执行机构驱动器设计至关重要.在分析压电陶瓷自身特性的基础上,研制一种基于PA93的高压、大电流、高速率的新型压电陶瓷驱动电源,并对所设计的驱动电源的输出电压稳定性、范围、线性度、静态纹波,带宽等各项性能指标进行测试,得以验证该驱动电源的性能满足了整个精跟踪系统的跟踪精度保持在3μrad左右的前提条件.     

Novel integrated position measurement unit for stepping motor servo control

Rotor position detection is important for motor servo system design. In general, there are two kinds of methods to obtain the position information in real time, sensor or sensorless methods. The sensor methods use position sensors such as optical encoder. This will greatly increase the cost of the system, and the sensor with high precision is difficult to be installed. On the other hand, the sensorless method can reduce the cost, but the reliability and complexity of the algorithm is still the problems. In this paper, a new low-cost integrated position feedback unit, which is composed of the integrated position sensor, signal processing hardware and software, is described. The sensor is easy to manufacture and has better precision with the help of signal processing circuit and software based on DSP. The sensor can obtain absolute rotating angle using inductance detection method, and it is originally designed and used for a 2-phase hybrid stepping motor position servo system. The integrated sensor and the proper control strategy make the system become a low-cost high-performance position servo system. Even though the feedback unit is originally designed for a 2-phase hybrid stepping motor, the same unit also can be used with other types of motors.     

基于矩阵式变换器的多驱动混合电气传动系统研究

提出了一种适合全电动战车的基于矩阵式变换器的多驱动混合电气控制系统,该系统由一个矩阵式的整流单元、多个逆变单元和其它单元组成;矩阵式的高频整流可以获得单位输入功率因数的输入电流,多个单元接在同一直流母线上,可以同时驱动和控制多路负载,在多个逆变单元中采用空间矢量调制,可以获得不同频率和幅值的PWM正弦输出电压;直流母线上还有蓄电池组,作为发电机故障时提供逆变用的直流电源。这个系统具有多驱动、体积小、集成度高、单位输入功率因数、输出多路可调和对主动力系统要求低的优点,适合车辆的全电动化,提高车辆的机动能力,仿真实验结果证实了所提出理论的正确性。     

基于CAN总线的数字可调电源系统

针对现在市场上的电源只能单独调节控制,不能实时反馈信息,精度低等问题,设计了一种基于CAN总线的数字可调电源系统。该系统用STC公司最新的增强型51单片机IAP15F2K61S2对电源转换与电源管理进行控制,通过CAN总线直接控制多个下位机模块,将当前信息实时传回上位机显示,实现智能高效、精准地控制、转换及通信。该系统可控输出0~20.0 V之间任意的恒定电压和0.01~3 A之间任意的恒定电流,可用于需要实时反馈数据、需要管理多个电源、复杂的高性能系统。     

人性化路灯控制系统的设计与实现

文章重点介绍了一种基于AT89S52单片机为控制核心的路灯自动控制系统。通过对于路灯系统工作环境的分析,提出了人性化的设计方案,该系统采用恒流源驱动路灯,具有调光功能,路灯驱动电源输出功率能在规定范围内设定并调节,可根据环境明暗变化自动开关灯,也可根据交通情况自动调节控制状态;路灯故障时,可发出声光报警信号,并显示故障路灯地址编号。该系统经过测试实验,能耗低,性价比高,具有较高的实际应用价值。     

三相反应式步进电动机的高性能驱动电源

提出了一种可变细分的高性能步进电动机驱动电源,该电源用于驱动三相反应式步进电动机。细分波形由AT89S52单片机控制DAC0832数/模转换器产生,驱动单元采用高压型恒流斩波电路。该电源在控制步进电动机转动时,微步精度高,低速运转时电动机振荡小,高速运转时输出力矩大。通过选择合适的细分数,可与不同档次的CNC控制器配套使用。批量使用结果表明,该电源稳定性好、性价比高,具有一定的推广使用价值。     

Micro-arc Oxidation Inverter Power Supply Based on the Limited Bipolar Soft-switch Control Method

In order to overcome many limitations of the conventional power supplies, such as ponderosity, big wastage, and simplex output characteristic, a dual-inverter power supply is designed to meet the different requirements of micro-arc oxidation. The main circuit structure and principle of the dual-inverter power supply for micro-arc oxidation is described, the control system and the control adjustment method are also introduced. The dual-inverter technology is adopted in micro-arc oxidation power supply. The limited bipolar control mode is applied in the power inverter circuit for adjusting the voltage, and various voltage waveform can be obtained by controlling the chopper circuit. Meanwhile, the control accuracy and response speed are improved greatly because of the higher inverter frequency. The power supply can output direct current(DC) waveform, DC pulse waveform, symmetry alternating current(AC) waveform, asymmetry AC waveform, and so on. Besides, the parameters such as pulse width, range, frequency, duty cycle can be adjusted. The experimental result shows that the power supply has many advantages, such as stable output, wonderful waveform consistency and obvious advantage in technique, and it can meet the requirements of micro-arc oxidation process fully.     

Development of a precision indentation and scratching system with a tool force and displacement control module

This article presents a tip-based micropatterning system with a precision device for measuring the machine force and the tool path. The machine force is obtained by a tool control module with a leaf spring and a capacitive displacement sensor. It is controlled to provide a force that ranges from 80 microN to 8 N. The force sensing unit, which is part of the module, is mounted on a PZT (PbZrTi) driven in-feed motion stage with a resolution of 1 nm. The work piece is set on an X-Y motion stage, and the position can be controlled with a tool path accuracy of 5 nm. Micropatterning and precision indentation experiments were performed, while the machined surfaces were examined by atomic force microscopy. From these results, the feasibility of the system for precise force-displacement control was verified for application in tip-based precision machining.