摘要
在超声波逆变电源系统中,为了降低开关损耗而广泛的采用移相SPWM技术。随着微处理器、数字信号处理器(DSP)越来越广泛的应用数字控制领域,特别是应用数字信号处理的数字移相控制器已成为移相技术的新潮流。而本文中应用的TMS320F2812 DSP芯片具有高速信号处理和数字化控制所必需的结构特点,将其先进的外设单元和高性能的DSP内核相结合,可以快速准确实现先进的控制方法,同时提高逆变电源中输出电压的精度和稳定度,而SPWM数字移相的特点是查表和在线仿真计算相结合。既能满足一定的控制精度要求,又能满足实时控制的要求,同时广泛应用于带反馈控制的逆变系统中。利用DSP本身的PWM波硬件生成及输出电路,极大地方便超声波电源控制系统的开发,使设计者把更多的精力放到程序算法的编写上,可以实现不同的控制方法;利用DSP的高速运算能力,还可以进一步提高载波比,以使输出信号的波形更佳。
Phase-shifting SPWM technology is widely used in the field of ultrasonic inverter power system. With microprocessors, digital signal processor （DSP） is widely used digital con- trol areas. In particular the application of digital signal processing digital phase shifter controller phase shifter technology has become the new trend. In this paper, and the application of TMS320F2812 DSP chip, a high-speed digital signal processing and control necessary for the structural features, and its advanced high-performance peripheral modules and the integration of DSP cores can be rapidly and accurately of advanced control methods, and raise the inverse variable power supply output voltage accuracy and stability, and SPWM digital phase-shifting features look-up table and online simulation combination that meets certain control accuracy and can meet the requirements of real-time control, while widely used in belt Feedback control of the inverter system. Use their own DSP hardware generation and wave PWM output circuit, ultrasonic greatly facilitate the development of power control system to enable designers to more concentrate on the preparation procedures algorithm, we can achieve different control methods using DSP high-speed computing capacity can be further improved carrier ratio, so that the out put signal waveform better.
出处
《电子测试》
2008年第8期37-41,共5页
Electronic Test
