基于DSP的大功率超声电源的研究.docVIP

摘 要 在声学领域中，功率超声技术发展最迅速、应用最为广泛。近年来，随着电子技术和材料科学的飞速发展，大功率超声技术在超声冲击、超声焊接、超声加工等方面的应用越来越广超声应用要求的不断提高，反过来又促进了对功率超声机理和超声电源研究的不断深入。在超声电源的研究中，实现频率跟踪和振幅恒定是两个关键技术。传统的超声电源控制部分由于使用的是模拟器件，其自身的特性决定了控制电路的精度差、自我调整能力弱温度稳定性以及抗干扰性能低，所以需要有更好的设计以满足超声电源的应用要求。 数字化电源控制灵活、易于实现柔性化，可以达到更高的稳定性和控制精度，接口兼容性良好。为了很好地解决模拟电源实时性较差和不可回调的缺点，本以数字信号处理器（DSP）为控制核心研制了一性能优越的新一代智能化大功率超声电源分析超声换能器的等效电路特性根据机械与电的等效理论，用二端口网络等效法分析超声换能器的特性，给出了系统控制方式的理论依据建立超声电源主电路，其中包括：整流、直流斩波、全桥逆变器和匹配网络等部分，实现了频率和功率均可调的大功率超声频交流电的输出设计控制系统的硬件电路，包括DSP的最小系统电路主要外围电路建立了一个可靠的控制系统硬件工作环境。根据超声电源的工作特点编写控制系统具体实现了控制思想。实验结果表明本文研制的基于DSP的大功率超声电源可以使系统工作在谐振状态，振动过程稳定所设计的软硬件系统基本实现了预期功能。关键词：超声电源数字信号处理器频率跟踪恒幅控制 Abstract In the field of acoustics, the high-power ultrasonic technology is fastest developed and widest applied. Especially in recent years, with the development of the electronic technology and the material science, the application of high-power ultrasonic technology is more and more wider in ultrasonic peening, ultrasonic welding, ultrasonic crushing, etc. This in reverse has promoted the study on the ultrasonic principle and ultrasonic power supply. In the study of ultrasonic power supply, frequency auto-tracing control and constant output specific power control are two important subjects for research. Due to the characteristics of the analog parts, the control circuit has low degree of accuracy and weak self-adjusting capability. The temperature stability and anti-jamming capacity are not good enough. And a better design is required to meet the needs of ultrasonic power supply. Digital power supply can achieve flexible control, high stability and precision and fine interface compatibility. In order to solve the problem of real-time control and back adjustment of the analog power, in this paper, a new type of intelligent high-power ultrasonic power supply whose control system is based on Digital Signal Processor (DSP) has been developed. The article firstly analyses the electrical impedance and working characteristics of ultrasonic vibration sys