高速模数转换器ADC0820在超高速动平衡测试系统中的应用

超高速动平衡测试系统可以对旋转机械在超高速旋转的工作条件下进行动平衡检测.介绍了ADC0820的主要性能特点和它在数据采样模块中的应用.以ADC0820为核心的采样模块只负责数据采样,提高了系统检测的速度与精度.模块采用分时存取系统,并利用整周期采样控制电路实现数据整周期采样,分析了ADC数据采样的时序控制,并验证了其可行性.     

由简入繁逐步添加实现电气控制线路的设计

继电器—接触器控制系统是电工学电气控制中的主要组成部分,现从点动控制电路入手,由简入繁,循序渐进,逐步添加,逐渐完备功能,实现了三相异步电机的连续控制、点动加连续控制、正反转控制、顺序控制、行程控制等较复杂控制电路的设计。     

一种避免风机低温失效的解决方案

设计了一种环境温度感知控制电路。当环境温度低于温度控制点时,控制电路断开风机的电源供应,风机停止工作,从而避免风机在低温环境下失效;当环境温度高于温度控制点时,控制电路接通风机的电源供应,风机开始工作,保证设备高温工作的可靠性不受影响。对温度控制点的设定、控制电路的基本原理和具体实现进行了描述。     

基于T-S模糊模型的非线性系统广义预测控制

针对离散非线性系统,提出一种基于T-S模糊模型的广义预测控制方法。该方法将采样点的T-S模糊模型转化为采样点线性模型与非线性误差叠加的线性形式,通过迭代修正非线性误差,使具有非线性误差的线性模型预测控制律逐渐逼近采样点T-S模糊模型预测控制律。同时,该预测控制方法也能适用于当系统受输入输出约束时的控制。仿真结果验证了所提出的TS模糊模型广义预测方法有效。     

基于DSP和智能功率模块的交流伺服系统硬件设计

随着微处理器技术、电力电子技术、电机制造技术和现代控制理论的发展,交流伺服系统的应用越来越广。以TMS320F2812为核心设计控制电路,以FSBB20CH60为核心设计功率驱动电路,完成了包括电流采样及故障保护在内的交流伺服系统硬件部分的设计,具备了设计合理、结构紧凑和控制精确等优点。     

气体介质放电间隙控制系统的研究

设计了以压电陶瓷驱动器为基础的气体放电电火花加工间隙控制系统，该系统包括硬件和软件两部分。其中，硬件系统包括采样保持电路、时序控制电路、电压信号比较电路、A／D转换电路，旨在提高间隙控制系统的响应速度，达到有效平稳控制电火花气体放电加工的目的。     

高速数据采集卡的设计

介绍一种采样速度可达500Msps的高速数据采集卡硬件设计方案和DMA控制电路。     

数控DC-DC变换器电流采样控制策略

基于F2407ADSP控制系统,提出了一种在电流断续时采用开环控制的策略,并针对数字系统离散采样的特点,根据每个开关周期的占空比来调整相应的电流采样点,以保证电流采样精度。实验结果表明,该控制策略可以很好地实现电路的恒流控制。     

变频器在三相异步电动机控制电路改造中的应用分析

针对改造前三相异步电动机点动与连续运行控制电路存在的问题进行了分析,详细介绍了应用变频器对原电路进行改造设计的控制方式,实现了电动机在点动状态和连续运行状态下不同频率、不同加减速时间运行,使其频繁启动不再受限制,提高了设备运行的安全可靠性。     

溜筒落流自动采样器的研制及应用

针对金鸡岩洗选厂364采样点洗矸石样品代表性差、操作存在不安全因素的状况,研制并分析了364自动采样器的采样铲动力选配、电器控制原理及机械结构设计制作等,实施应用结果表明,自动采样替代手工操作,提高了采样代表性,降低了员工劳动强度,利于生产管理。     

新型非最小电压应力无源无损Buck电路软开关的设计

无源无损缓冲电路可分为:最小电压应力无源无损缓冲电路和非最小电压应力无源无损缓冲电路.非最小电压应力无源无损缓冲电路中缓冲电感与电容的比值不再受到限制,能实现更宽的占空比,且具有更高的工作效率.因此本文针对非最小电压应力无源无损缓冲电路展开研究,以Buck变换器为基础,设计出了一种新型的非最小电压应力无源无损缓冲电路,经研究验证了该缓冲电路可有效降低开关损耗,且具有将缓冲过程中存储的能量回馈给电源的优势.     

压电驱动无针注射器脉冲电源设计

针对压电驱动无针注射对电源的需求,设计了与压电无针注射器配套的脉冲电源,该脉冲电源的驱动控制系统由电池提供12V的直流电压,通过Buck与推挽电路级联电路升压后整流滤波输出0～400V直流可调电压,由反馈电路对输出电压进行校正,最后全桥逆变电路实现输出频率与占空比可调,且输出电压在0～400V随占空比的改变成线性变化的瞬时高压脉冲信号。实验结果表明,该脉冲信号稳定可靠,输出纹波在范围0.5%以内,满足了压电驱动无针注射电源需求。     

An PBЕ-73C vacuum spark gap with a control circuit based on an inductive energy storage

The design and operating principle of a small (50 mm in diameter and 100 mm in height) РВЕ-73C vacuum spark gap are described. It is shown that it can be efficiently switched using a control circuit with a low (∼900 V) supply voltage, which is based on an inductive energy storage and a diode opening switch that forms a high-voltage igniting pulse with a rise time of nanosecond duration. The РВЕ-73C switching process is investigated at different rise times of igniting voltage pulses and different igniting current amplitudes. The results of tests of the spark gap operating in regimes of switching current pulses with an amplitude of 12 kA and a rise time of 800 ns are presented.     

城市轨道交通直流PWM电源的研制

旨在通过PWM（脉冲宽度调制）,解决城市轨道交通接触网电压的波幅较大和波形畸变严重的问题,并将交流整流成直流;通过PWM,调节电源电路输出脉冲的占空比,控制IGBT主回路的电压,以实现PWM稳定电压的目的。本文研制出1种通用的轨道交通直流PWM电源,其电路包括主电路及控制电路,设计出PCB（印制电路板）并进行试验。试验结果表明,该电源具有稳定和调节电压的功能,达到了电源优质化的目的。     

Investigation of high-voltage integral pulse thyristors in single-pulse and pulse-train modes

The results of studying the switching capabilities of recently developed high-voltage integral pulse thyristors (HIPTs) with a working area of 0.45 cm² and an operating voltage of 3 kV are presented. A silicon chip of a thyristor consists of a large number of microthyristor cells that are enabled strictly synchronously with a control-current pulse, thus providing low switching energy losses and allowing a current of up to 8 kA at a pulse duration of 1.5 μs to be switched within 500 ns in a single-pulse mode. The HIPT switching-off time is several microseconds when, after a power-current pulse terminates, a field-effect transistor with a low (tens of milliohms) channel resistance closes the emitter–base circuit. The low switching energy loss and the short switching-off time made it possible to use HIPTs in the mode of switching current pulses with an amplitude of 500 А at a frequency of 50 kHz.     

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.     

一种移相全桥ZVZCS PWM DC_DC变换器的研究及改进

针对零电压零电流开关（ZVZCS）全桥变换器在轻载情况下,超前臂零电压开关（ZVS）效果不佳的问题,对其进行了改进,增加了由2只电容器及1只电感器组成的辅助电路;讨论并提出了一种基于两个独立变压器串联的带辅助电路的新型高效ZVZCS全桥变换器。该变换器的超前臂实现了零电压开关,滞后臂实现了零电流开关（ZCS）。仿真试验结果证明：该方法改善了超前臂ZVS效果不佳的缺陷,同时该变换器是简单可靠的。     

环鸣法声速仪超声波发射/接收电路设计

通过对海洋环鸣法声速仪的深入分析,阐述环鸣法声速仪的工作原理,设计了1种的超声波发射/接收电路。重点研究了高压窄带脉冲产生电路、MOS管驱动电路以及匹配网络。对研制的电路进行了性能分析,所有的电子器件均无过热现象,获得了较为理想的超声波。整个电路结构简单,成本相对低廉,操作安全,易于模块化实现,符合待定检测的要求。     

Small switches of high-power microsecond pulses on the basis of high-voltage integrated pulse thyristors and reverse switch-on dynistors

A high-voltage switch on the basis of a small unit of series-connected high-voltage integrated pulse thyristors (HVIPTs), which were developed at the Ioffe Physical Technical Institute, was designed and investigated. At a power voltage of 25 kV, current pulses of microsecond duration with an amplitude of 2.8 kA and a rise time of 0.8 μs were switched. The attained current density through an HVIPT (5.6 kA/cm²) appreciably exceeds the permissible current density for conventional thyristors. It is shown that the developed HVIPT unit can be used in the triggering circuit of a high-power assembly of reverse switch-on dynistors (RSDs) at an operating voltage of 25 kV, which consists of 14 series-connected dynistors with a diameter of their structures of 24 mm. The RSD switch with a triggering circuit on the basis of HVIPTs allowed switching of rapidly rising current pulses with an amplitude of 20 kA and a duration of 150 μs. The small dimensions of the HVIPT unit (4 × 10 × 32 cm) and the RSD assembly (7 × 7 × 34 cm) determine the wide prospects for using them in high-power pulse technology.     

基于ICL7667实现步进电机高频斩波控制

为了提高小内阻步进电机驱动系统中功率MOSFET的开关速度,采用ICL7667作为功率MOSFET的驱动器,从而实现步进电机的高频斩波控制。首先,针对电阻分压式驱动电路测试和仿真中出现的功率MOSFET的漏级输出未处于截止和深度饱和状态的问题,对所采用的功率MOSFET的栅极电容特性、开关时间等进行了研究,发现栅极电容的充放电过程影响了功率MOSFET的开关速度。接着,提出了提高功率MOSFET开关速度的方法。最后,采用ICL7667作为功率MOSFET的驱动器实现了步进电机的高频斩波控制。仿真和试验结果表明：电阻分压式驱动电路在斩波频率不大于20kHz时,功率MOSFET的漏级输出能处于截止和深度饱和的状态;采用ICL7667的驱动电路,可以保证斩波频率为200kHz时,功率MOSFET的漏级输出仍处于截止和深度饱和的状态。采用ICL7667的驱动电路,使得其斩波频率比电阻分压式驱动电路的斩波频率提高了10倍,可保证小内阻步进电机在高速斩波信号的控制下正确运行。