基于DSP的高频逆变电阻点焊电源的研究  

Research on High Frequency Inverter Resistance Spot Welding Power Supply Base on DSP

作　　者：曾敏[1] 魏良红[1] 马成[1] 曹彪[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《机械工程学报》2011年第6期80-85,共6页Journal of Mechanical Engineering

基　　金：广州开发区科技计划资助项目(2009Q-P111)

摘　　要：微型零件的焊接要求焊接电源有较高的控制精度和良好的动态特性,必须提高电源设备的精密性和稳定性以提高焊接质量。因此,设计出基于数字信号处理器(Digital signal processing,DSP)的高频逆变电阻点焊电源。该电源以DSPIC30F6010A为控制核心,逆变主电路采用有限双极性的控制方式,通过调节脉冲宽度调制(Pulse width modulation,PWM)占空比来实现对输出电流的调节。调节控制中使用限制增量的比例积分(Proportion integration,PI)调节,以保证PWM调节的控制精度,并通过改变PI参数来得到3段焊接电流,实现焊接电流的精确调节。介绍电源控制系统的组成部分、有限双极性的工作原理,详述数字PWM的生成以及数字PI调节的方法,并通过试验进行验证。在试验中检测逆变电路的驱动电压波形,并获得设置不同参数时稳定输出的电压、电流波形。结果表明,该电源控制系统稳定可靠,具有较高的控制精度和较快的响应速度。焊接产品性能优良,达到了预期的焊接工艺要求。The welding of micro-components requires the welding power source to have high control accuracy and excellent dynamic characteristics.The precision and stability of the resistance spot welding power must be promoted so that the welding quality can be improved.Therefore,the high frequency inverter resistance spot welding power supply based on DSP is designed.dsPIC30F6010A is the control core of the power.The limited bipolar control scheme is used in the main inverter circuit.PWM is adopted to adjust welding current features.Limited Increment Form PI is also used in the control system to improve the precision of PWM control.The PI parameters are changed continuously to produce three-segment current,so the welding current can be precisely adjusted.The components of the power control system and the working principle of the limited bipolar control are introduced.The digital PWM generation and digital PI adjustment are described in detail and verified by tests.In the tests,the waveform of the driving voltage of inverter circuit is detected and it is proved that the welding voltage and current is stable under different parameters.It is also confirmed that the control system is stable and reliable,and has high control accuracy and response speed,thus satisfying the welding process requirements,which results in good performance of welding products.

关 键 词：逆变点焊 脉冲宽度调制 限制增量的比例积分调节 高频 

分 类 号：TH-55[机械工程]