| The power ultrasonic technology is in wide spread application of every department of national economy according to its advantages. With the appears and ripe constant of new theory, technology, device, ultrasonic technology will give full play to its advantage. In this paper, the ultrasonic welding system is made up of high-frequency ultrasonic power and piezoelectric oscillator mainly. The high-frequency ultrasonic power offers the electric energy for piezoelectric oscillator; the piezoelectric oscillator transfers the electric energy to the kinetic energy, and weld to welding the part. This paper is mainly about the high power ultrasonic topological analysis and design.In this paper, a deep research to piezoelectric effect and piezoelectric equation of the piezoelectric material at first, and has carried on careful analysis to vibration mode and relevant parameters of the piezoelectric oscillator, then analyzed the equivalent circuit of the piezoelectric oscillator and established its equivalent model and matching circuit. Secondly, in response of the specific requirements of the ultrasonic power to the ultrasonic welding, the main circuit and power converter circuit basic structure is proposed. A rectifier and filter circuit, power amplifier, driving circuit is designed. In addition, the main part of the rectifier and filter circuit, power conversion and other sectors circuit is analyzed and given the parameters and options.Then a stair-wave inverter and resonant sine wave inverter as a high-frequency ultrasonic power, and the theoretical analysis, design, simulation and experiment is provide. Finally, the corresponding experimental results verify the circuit theory and the theoretical analysis.
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