摘要
研发了用于复合型超音频脉冲电弧焊接的超音频脉冲电源,其输出脉冲电流的频率和幅值可独立调节和准确控制,并提出了"并联+辅助网络"耦合方式.在建立输出脉冲电流控制模型的基础上,构建了包含降压变换器、全桥变换器和高频耦合变压器的超音频脉冲电源功率变换电路;脉冲电流频率的调节通过改变全桥变换器的开关频率实现,脉冲电流幅值采用对降压变换器的输出电压幅值和全桥变换器的输出电压占空比进行两级反馈控制,以保证其准确性和稳定性.结果表明,超音频脉冲电流的频率和幅值调节快速、准确、稳定,与焊接电弧具有良好的耦合效果.
An ultrasonic frequency pulse power supply,applied to the composite ultrasonic frequency pulse arc welding,was designed and developed,and the frequency and amplitude of its output pulse current could be adjusted and controlled independently. A coupling method of ultrasonic frequency pulse power supply with direct current welding power supply was proposed,which is ' parallel + auxiliary network'. Based on the establishment of control model of output pulse current,the power conversion circuit of ultrasonic frequency pulse power supply was set up,which consists of a buck converter,a full bridge converter and a high frequency coupling transformer. The frequency regulation of pulse current can be achieved by controlling the switching frequency of the full bridge converter,and the amplitude of pulse current was controlled by means of two-stage feedbacks,that is the amplitude adjustment of the buck converter output voltage and the output pulse duty cycle regulation of the full bridge converter,to guarantee its accuracy and stability. The experimental results demonstrate that the frequency and amplitude of ultrasonic frequency pulse current can be adjusted quickly,accurately and steadily,and have a good coupling effect with welding arc.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第8期13-16,129,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51075231)
国家科技重大专项资助项目(2012ZX04012011)
关键词
耦合方式
超音频脉冲电流
调频调幅
降压变换器
全桥变换器
coupling mode
ultrasonic frequency pulse current
frequency modulation and amplitude modulation
buck converter
full-bridge converter