基于级联9电平技术的大功率超声波电源

High power ultrasonic power supply based on cascaded 9 level technology

为了提高超声波电源的输出功率,该文提出了一种基于级联9电平技术的大功率超声波电源。电源逆变部分由两个H桥单元级联组成,经过一定的控制策略实现输出电压为9电平波形,可以显著提高超声波电源的输出功率,改善输出电压的波形质量。提出一种电压差法跟踪换能器的谐振频率,只需采样3个电压,根据3个电压之间的数值差调节输出频率。通过分析该超声波电源的系统结构、工作原理及控制策略,并进行仿真实验,验证了该方案的可行性和有效性。

In order to improve the output power of the ultrasonic power supply,this paper proposes a highpower ultrasonic power supply based on cascaded 9-level technology.The power inverter part is composed of two H-bridge units cascaded.After a certain control strategy,the output voltage is 9-level waveform,which can significantly increase the output power of the ultrasonic power supply and improve the waveform quality of the output voltage.A voltage difference method is proposed to track the resonant frequency of the transducer,which only needs to sample three voltages and change the output frequency according to the numerical difference between the three voltages.By analyzing the system structure,working principle and control strategy of the ultrasonic power supply,and simulation experiments to verify the feasibility and effectiveness of the scheme.