Ultrasonic frequency pulse power supply and its parallel coupling with welding power supply

作者：Zhu Zhiming; Tang Yingying; Ji Shengru; Yang Zhongyu

来源：Transactions of the China Welding Institution, 2016, 37(8): 13-16.

• Amplitude adjustment
• Buck converters
• Coupling mode
• Frequency regulations
• Full bridge converters
• High-frequency couplings
• Parallel coupling
• Ultrasonic frequency pulse

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.

• 出版日期2016
• 单位清华大学