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。     

基于STC系列单片机的车载逆变电源

针对传统逆变电源启动困难的问题,对控制策略进行了改进,设计了一款以单片机STC12C5A60S2为主控芯片的两级式级联车载逆变电源。该电源以12 V直流电压为输入,通过升压与逆变两个功率变换环节得到了220 V,50 Hz的正弦交流电。在升压环节,采用直流母线电压负反馈,确保了直流母线电压的稳定性;在逆变环节,采用正弦脉宽调制(SPWM)技术,将输出电压的谐波畸变率(THD)降低到了5%以内。此外还对电池电压检测电路、输出电压检测电路、输出电流检测电路、桥臂短路保护电路进行了设计,并研制了实验样机。研究结果表明,采用逆变电路先触发升压电路后触发、根据输出电压实时更新占空比的控制策略,该逆变电源能够顺利启动,稳压特性良好,为以后逆变电源的优化设计提供了参考。     

基于DSP的大功率三相逆变电源设计与实现

给出了一种三相中频大功率逆变电源的设计实现方法,采用了组合式结构,使电源带不平衡负载能力增强,适用于更多的使用环境。并且分析了逆变电源的基础理论,选定采用组合式三相半桥逆变主电路结构和双极性SPWM波控制方案,重点介绍了以TMS320LF2407A芯片为核心的DSP控制电路、保护电路和辅助电路;完成了输出电压和电流采样软件、双极性SPWM的PID电压调节闭环控制软件,通过对原理样机的实验,结果表明,该电源设计方案可行,达到了性能指标要求。     

基于DSP的可编程交流电源研究

交直流电压源是电源实验室与科研机构必不可少的工具,针对幅值和相位连续可调交流电压源价格昂贵而直流电压源价格便宜且广泛应用于实验室中。本文研究了一种以直流电压源为输入,幅值频率可调的可编程电源。该电路由一个前级Boost电路和一个后级全桥逆变电路组成。同时,逆变电路采用倍频调制,电压电流双环控制,动态性能优越。通过制作一台以DSP为核心处理器的样机,验证了控制策略的优越性。     

中频逆变高频PWM电子束焊机高压电源

设计一种中频逆变高频PWM电子束焊机高压电源装置,装置将由高频PWM脉冲驱动的逆变器产生的中频交流电送入中频高压变压器,通过高压整流滤波器、高压放电扼流电路后得到纹波系数小、运行稳定的高压输出,同时故障判别电路对高压电源实时监控,当出现异常时,实现快速截止保护。实验结果表明,这是一种调节速度快、效率较高的电子束焊机高压逆变电源装置。     

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。     

基于SVPWM的AC03型辅助逆变器的仿真研究

以AC03型辅助逆变器为研究对象,分析了以IGBT为开关元件的二电平逆变器的主电路的工作原理和电压空间矢量脉宽调制（SVPWM）控制方法。利用MATLAB软件进行了逆变器的PWM控制仿真,结果表明采用该方法可以控制辅助逆变器输出良好的电压波形,并准备在该型逆变器上用IGBT模块替代IPM模块。     

基于PLC的微弧氧化电源控制系统研制

基于可编程序控制器（PLC）研制了微弧氧化电源智能控制系统,系统人机通讯良好,不仅实现了电压、电流以及过程控制,更重要的是利用PLC内部和外接电路协调作用实现了PLC的脉冲宽度和频率控制,实现了恒流、恒压脉冲精确控制,以及工作模式的自动转换等功能,使得微弧氧化工艺过程优化和膜层控制成为可能。     

一种新型超声电机驱动电源的研究

介绍了一种直接用市电供电的超声电机驱动电源的基本原理及其工作方法。该电源采用脉总宽度调制的方法,用一级功率电路得到稳定的高频高压信号。文中详细介绍了控制信号的产生及反馈网络的相位补偿的方法,使输出信号稳定且满足驱动超声电机的需要。     

基于功率平衡的微电网稳定性控制策略

针对含有储能元件的分布式发电系统存在直流母线电压难以准确控制,直流子网切负荷瞬间交流子网电压及频率会偏离正常值的缺点,提出了基于功率平衡带负载前馈的蓄电池控制策略和改进的V/f逆变控制方法对其进行改进。仿真结果表明:交直流混合微电网在孤岛模式下和受扰动时,该方法均能使直流母线电压实现稳定且电压和频率都能够满足正常运行的要求,同时提高了整个系统的抗扰动能力。     

A type of inverter power supply based on harmonic elimination PWM control

In order to output sine wave with small degree of distortion and improve stability,a type of inverter power supply is designed based on harmonic elimination pulse-width modulation(PWM)control.The rectifier and filter are added to input circuit of the inverter.Single-phrase full-bridge inverter performs the function of converting direct current into alternating current(DC/AC).In the control circuit,single chip micyoco(SCM)AT89C2051 is used for main control chip to accomplish the hardware design of the control system.A given value of output frequency of the inverter is input in the way of coding.According to the output frequency code which is read,SCM AT89C2051 defined harmonic elimination PWM control data which will be selected.Through internal timing control,the switches are switched under this provision of PWM control data.Then the driving signals of the switches in the inverter are output from I/O of SCM AT89C2051 to realize harmonic elimination PWM control.The results show that adding Newton homotopic algorithm of harmonic elimination PWM control to corresponding software of the control system can make the quality of output voltage of the inverter higher and it will have broad application prospects.     

水电专用在线式UPS系统设计

水电专用UPS使用单片机PIC18F2331作为控制核心,通过驱动芯片HCPL3120驱动全桥逆变电路桥臂上的4个场效应管,控制逆变器输出标准正弦电压.同时,还设计了包括直流过压、直流欠压、频率捕捉、掉电检测和输出过载等保护电路,实现了水电站故障时启闭机和调速器的快速可靠关断,提高了电站运营的安全系数.     

基于TMS320F2812的数字化超声电机驱动器

提出了一种基于TMS320F2812的数字化超声电机(USM)驱动控制装置.该装置由PFC电路、DC/DC变换电路、频率可调的半桥逆变电路和以高性能DSP芯片TMS320F2812为核心的控制器组成.PFC电路提高装置的功率因素;DC/DC电路实现电压宽范围调节;高频逆变电路实现频率和相位均可调的超声频交流电的输出,直...     

自适应型无阻高频脉冲电源的研究

采用双管正激交错并联结构设计输出电流连续可调的DC/DC变换器恒流源，主电路后级电路不用电阻限流，也不用电感限流，而是利用前级DC/DC变换器以及脉冲控制发生电路共同作用来控制后级电路中的加工电流。     

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。     

Local arc discharge mechanism and requirements of power supply in micro-arc oxidation of magnesium alloy

To study the requirements of the power supply in micro-arc oxidation (MAO) of magnesium alloy, many experiments were performed under the DC, unipolar, and ambipolar pulse output modes. Based on the experimental results and electric arc theory, the separate local arc discharge mechanism was put forward. It is considered that magnesium MAO process consists of three stages including anodic oxidation, micro-arc oxidation, and large-arc discharge in turn with increasing source voltage. The MAO film is composed of metal oxides that resulted from numerous discrete local arc discharges, which accumulate the non-equilibrium structure after undergoing sudden heating and cooling cycles. Separate local arc discharge is caused by the process in which the oxygen-based gas is ionized in the conduct channel bearing electric field intensity, changed from insulator to conductor that presents sharp negative resistance effect, and produced partially high temperature to ignite locally metal oxidation. The local arc discharge model is described as four courses: gas created from electrolysis, arc discharge, metals oxidization, and cooling and shrinking of oxides. The purpose of pulse supply is to inhibit the large-arc discharge by intervening proper cooling time, which cannot be actualized by a unipolar pulse mode because of the strong capacitive load characteristics but can be reached by an ambipolar pulse supply because the negative pulse period acts as cooling time. Using a discharge loop to remove the influence of load capacitive, a new type of pulse power supply for MAO is developed, so that the large-arc problem is resolved effectively, the film-forming efficiency is improved, and the pollution of the film and electrolyte caused by negative voltage is avoided.     

Local arc discharge mechanism and requirements of power supply in micro-arc oxidation of magnesium alloy

To study the requirements of the power supply in micro-arc oxidation (MAO) of magnesium alloy, many experiments were performed under the DC, unipolar, and ambipolar pulse output modes. Based on the experimental results and electric arc theory, the separate local arc discharge mechanism was put forward. It is considered that magnesium MAO process consists of three stages including anodic oxidation, micro-arc oxidation, and large-arc discharge in turn with increasing source voltage. The MAO film is composed of metal oxides that resulted from numerous discrete local arc discharges, which accumulate the non-equilibrium structure after undergoing sudden heating and cooling cycles. Separate local arc discharge is caused by the process in which the oxygen-based gas is ionized in the conduct channel bearing electric field intensity, changed from insulator to conductor that presents sharp negative resistance effect, and produced partially high temperature to ignite locally metal oxidation. The local arc discharge model is described as four courses: gas created from electrolysis, arc discharge, metals oxidization, and cooling and shrinking of oxides. The purpose of pulse supply is to inhibit the large-arc discharge by intervening proper cooling time, which cannot be actualized by a unipolar pulse mode because of the strong capacitive load characteristics but can be reached by an ambipolar pulse supply because the negative pulse period acts as cooling time. Using a discharge loop to remove the influence of load capacitive, a new type of pulse power supply for MAO is developed, so that the large-arc problem is resolved effectively, the film-forming efficiency is improved, and the pollution of the film and electrolyte caused by negative voltage is avoided.     

高频脉冲电解加工电源的研制

近些年研究发现脉冲电流电解加工比起直流电解加工有更高的加工精度,为此研制了一套以IGBT(绝缘栅双极型晶体管)作为斩波元件的全桥逆变高频脉冲电解加工电源。详述了电源的总体结构、全桥逆变电路、以SG3525A为PWM(脉冲宽度调制)控制芯片的脉冲信号发生电路及调节电路和IGBT驱动电路的原理和过程。提出了一种使用大容量IGBT作为泄流元件的快速短路保护系统。该电源可输出占空比可调,频率达40kHz,最大为2kA的脉冲电流,输出波形稳定、不失真。     

基于STC12C5410AD单片机的数控交流调压器设计研究

根据实验室用脉冲源的需要,设计出了一种数控交流调压器,其电路由单片机主控电路、继电器调压控制电路、交流输出电压检测电路、显示电路、按键输入共5个部分组成。与传统的自耦变压器相比具有操作方便、电源稳定性高以及其输出电压大小采用数码显示的特点。     

基于DSP的单相逆变电源的智能控制研究

针对逆变电源输出稳态特性与动态性能兼顾的问题，采用数字信号处理器DSP作为控制核心，将智能控制与常规控制相结合，提出了系列新型单相逆变电源设计方案：模糊自整定PI双闭环控制设计方案。与传统的PID控制器相比，模糊PID控制具有超调量小，鲁棒性强，自适应性强，调节时间短，输出电压波形具有较低的总谐波畸变率THD，同时还获得了良好的稳态和动态特性，能够较好地满足逆变电源的控制要求。