CAJ | 학술논문

为了提高微电弧焊接过程中的电流控制精度和小电流稳定性，设计了一种精密微电弧焊接逆变电源。该电源在传统钨极氩弧焊电源的基础上加入了基于数字信号处理器的全数字化控制系统，采用有限双极性控制方法实现了全桥逆变电路的软开关。文中还介绍了电弧负载的电特性，分析了焊接工艺对电源电气特性的要求，设计了直流和脉冲两种波形控制方案，阐述了电源系统的软件流程及控制算法。结果表明：通过精确控制电流、时间、频率、脉宽等输出参数，可实现对输出能量的精密控制，且波形一致性较好；采用积分分离PID控制算法，可实现电弧“起弧－燃烧－收弧”过程的柔顺过渡，提高小电流输出时的电弧稳定性。
위료제고미전호한접과정중적전류공제정도화소전류은정성，설계료일충정밀미전호한접역변전원。해전원재전통오겁아호한전원적기출상가입료기우수자신호처리기적전수자화공제계통，채용유한쌍겁성공제방법실현료전교역변전로적연개관。문중환개소료전호부재적전특성，분석료한접공예대전원전기특성적요구，설계료직류화맥충량충파형공제방안，천술료전원계통적연건류정급공제산법。결과표명：통과정학공제전류、시간、빈솔、맥관등수출삼수，가실현대수출능량적정밀공제，차파형일치성교호；채용적분분리PID공제산법，가실현전호“기호－연소－수호”과정적유순과도，제고소전류수출시적전호은정성。
In order to improve the control precision of welding current and the stability of arc with low current du -ring the micro arc welding , a precision inverter power supply is designed .In this power supply ,a digital control system based on the digital signal processor is introduced into the traditional argon tungsten arc welding inverter , and the limited bipolar control method is used to realize the soft switching of the full-bridge inverter.In addition, the electrical characteristics of the arc load are introduced , the requirements of welding process for the power su-pply are analyzed ,two kinds of waveform control schemes respectively for direct current and pulse are designed , and the software procedure of the power system and the corresponding control algorithm are expounded .It is de-monstrated that both the precise control of output energy and the nice consistency of waveforms can be achieved by accurately controlling such output parameters as current , time, frequency and pulse width; and that the integral separation PID control algorithm helps to realize a smooth transition of the arc from arcing to breakdown and then to annihilation , thus improving the stability of arc with low current .