A novel variable polarity welding power based on high-frequency pulse modulation

A new type of variable polarity welding power modulated with high-frequency pulse current is developed. Series of high-frequency pulse current is superimposed on direct-current-electrode-negative （DCEN）, which can improve the crystallization process in the weld bead as a result of the electromagnetic force generated by pulse current. Digital signal processor （DSP） is used to realize the closed-loop control of the first inverter, variable polarity output of the second inverter and high-frequency pulse current superposition.     

A research of arc welding inverter with high stable precision

This paper mainly introduces an output control method with high stable precision of a large power IGBT arc welding inverter.Experiments indicate that this kind of control mode can effectively improve the static and dynamic characteristics and stability of power supply system.And it can decrease the spatters in the welding process apparently.This power supply is especially suitable to automatic robot welding assembly line.It will be the developing direction of robot welding supply in the future.     

Study on fuzzy control IGBT inverter arc welding power source for robot

Arc welding robot is playing more and more important roles in modern welding manufacturing, but now available welding power sources seldom satisfy with robot system requirements. In this paper, study on fuzzy control IGBT inverter arc welding power source for robot is developed to bring robotic advantages into full play. Firstly, fast response 500A IGBT inverter arc welding rectifier is developed. Secondly, fuzzy control system, which features multi-functions, fast response and wide using range, is developed and reliable measures for preventing interference are designed. Finally, technological experiments for carbon steel are made. The welding experimental results show that the goal of design is attained.     

Digital controlling for GMA welding machine based on DSP

This paper introduced a welding machine for GMAW using digital controlling method based on DSP (Digital Signal Process ). By means of flexible programming according to welding technologies and experiences the suitable characteristics of welding machine, such as line compensation, welding voltage and current feedback, wire-feed driving, SCR trigging and so on, can be controlled and self-adjnsted using digital signals. Through the designing based on DSP it is put out that the traditional hardware of control circuit is decreased greatly which can enhance the stability and reliability of welding machine. Finally, the welding experiment using CO2 shielding gas proves that the welding process is stable.     

Computer simulation of short-circuiting transfer welding under waveform control on inverter power source

A simulation model is introduced about the non-linearity process of short-circuiting transfer in CO2 arc welding for displaying the interaction between the inverter power source and welding arc under waveform control. In the simulation model, the feedback signals of current and voltage are taken respectively at the different phase in a short circuit periodic time and applied to the PWM （pulse width modulation） module in a model of inverter power source to control the output of power source. The simulation operation about the dynamic process of CO2 short-circuiting transfer welding is implemented on the founded simulation model with a peak arc current of 400 A and a peak voltage of 35 V, producing the dynamic arc waveforms which can embody the effect of inverter harmonic wave. The simulating waveforms are close to that of welding experiments.     

A method of initial welding position guiding for arc welding robot based on visual servo control

0　IntroductionCurrentlyintelligentizingweldingrobotisaresearchdirectionthatgreatattractsresearchers.Thereinto ,theapplicationofvisionsensoristhemostattractedoffsetinintelligentizingrobotweldingwithbroadenutilityfield[1] .Themainadvantageofusingvisionisthatitneedn’tdirectcontactwithobject,andeasytosolveproblemwithnaturalandefficientway ,soplantracebe foremovingandfeedbackinformationduringmoving .Itissuitabletotasksinwhichdemandtheabilitytoadaptthechangingenvironments .Thispaperexploredthetas…     

DSP控制的单位功率因数弧焊逆变电源

为了使弧焊逆变电源具有单位功率因数和恒电流输出特性,在研究PWM整流、逆变技术的基础上,提出了采用DSP实现弧焊逆变电源功率因数校正控制和后级逆变桥路控制的策略。前级功率因数校正环节采用基于三相dg旋转坐标下的双闭环PI控制整流技术,后级全桥逆变器采用传统的PWM调制技术。采用Matlad)软件simulink电源模块,对前后级控制电路进行校正和仿真分析,并得到仿真波形。通过对实验样机验证了方案的可行性,输入电流总谐波畸变率能控制在10％以内,功率因数接近1。     

基于DSP的软开关逆变弧焊电源的设计

给出了软开关逆变弧焊电源的主电路和数字化控制电路的设计方法.对比了逆变弧焊电源两种常用的软开关技术,在综合分析两种技术优缺点的基础上选择了ZVZCS,并就ZVZCS工作原理进行了阐述,给出了其主电路参数的设计方法.控制电路采用基于DSP的数字化控制系统,详细给出了移相PWM的实现原理和控制系统的软件流程图.根据以上原理试制了一台逆变弧焊电源,实验结果证明了设计原理的有效性和可行性.     

DSP在弧焊逆变器中的应用

针对传统单片机控制的弧焊逆变器的缺点，阐述了DSP适于弧焊逆变器控制的特点，提出用DSP实现弧焊逆变器的数字化控制，并给出控制系统的硬件和软件设计。     

弧焊逆变龟源DSP的选型

针对弧焊逆变电源控制系统的要求，介绍了适于弧焊逆变电源控制用的3种典型DSP芯片。通过对这3种控制用典型DSP芯片的性能进行对比，分析了DSP芯片的选型原则，从而为弧焊逆变电源控制系统的设计提供DSP芯片选型参考。     

一种基于空间矢量调制的弧焊逆变电源PFC控制方法

将空间矢量调制(SVPWM)方法引入到弧焊逆变电源功率因数校正(PFC)技术中，通过控制PWM整流器开关八个基本矢量不同的作用时间，调整输入电压矢量来达到控制输入电流的目的。详细地阐述了SVPWM控制原理和具体实施方案。同时，针对弧焊逆变电源的变动负载的特点，先借助Saber软件通过仿真研究了SVPWM用于弧焊逆变电源的适用性。最后通过DSP控制的试验样机对提出的方案进行了验证，其低电流畸变率，高功率因数和快速的动态响应的特点为弧焊逆变电源的PFC技术提供了一个新的控制途径。     

软开关弧焊逆变电源数字化控制的研究

介绍了弧焊逆变电源的软开关技术及其实现。在与传统的弧焊电源控制比较的基础上,提出了一种软开关弧焊逆变电源的数字控制方案。该方案采用数字信号处理器(DSP)作为控制系统的核心,使得焊接逆变电源无论是在数字运算能力还是过程控制能力上都能够满足现代逆变焊接的要求。     

高功率因数弧焊逆变电源的整流器设计与实验

分析了弧焊逆变电源功率因数校正技术的特点,阐述了弧焊逆变电源中基于差接三角形自耦变压器十二脉波整流电路的原理与设计及其功率因数校正机理.通过仿真分析,弧焊逆变电源采用这种电路后,功率因数可以达到99%,电流谐波畸变率降低到7%.实验证明所提方案确实可行.     

基于DSP的数字化控制逆变式空气等离子切割电源研究

采用数字信号处理器DSP56F805,建立了逆变式空气等离子切割电源数字化控制系统.利用霍尔电流传感器检测电源输出电流,通过采样与A/D变换、数字滤波和PID控制实现了稳定的恒电流输出特性,并通过大林算法克服了数字PWM控制以及功率变换电路输出本身的延迟效应.此外,电源系统还采用Boost电路进行有源功率因数校正,输入EMI滤波电路滤除高频干扰,从而有效地提高了电源系统的功率因数和工作稳定性,以及数字化控制系统的抗高频干扰能力.实验结果表明,该数字化控制逆变式空气等离子切割电源切割过程稳定,切割质量良好.     

弧焊逆变电源DSP控制系统的设计

为了实现数字化控制焊机，结合DSP芯片自身的特点．设计了基于DSP的弧焊逆变电源的控制系统，并给出了相应的硬件电路和软件框图。     

一种弧焊逆变电源的小信号模型

采用状态空间平均法对弧焊逆变电源系统建立了小信号模型，推导系统的传递函数，并对其开环频率特性进行分析，在此基础之上，运用自动控制原理的方法对系统的补偿环节进行设计，最后使用仿真验证了所设计的系统，仿真结果表明，所设计的补偿环节使弧焊电源的快速性和抗扰动能力有了显著的改进，说明设计的正确性。