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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。传统的模拟控制存在精度低、动态响应慢等缺点,在此介绍了一种基于TMS320F2812 DSP芯片的SPWM数字移相方法。该方法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。
In the ultrasonic inverter power system, in order to reduce the switching loss and widely used phase-shift SPWM technology. The traditional analog control has the disadvantages of low precision and slow dynamic response. A SPWM digital phase shift method based on TMS320F2812 DSP chip is introduced here. The method is characterized by the combination of look-up table and on-line simulation calculation, which can not only meet the requirements of a certain degree of control precision but also meet the requirements of real-time control, and is widely used in the inverter system with feedback control.