基于DSP 56F805的空间矢量脉宽调制

Space Vector Pulse Width Modulation Implementation Based on DSP 56F805

空间矢量脉宽调制是依据变换器空间电压(电流)矢量切换来控制变换器的一种新颖思路的控制策略。利用Freescale公司数字信号处理器56F805实现空间矢量脉宽调制。DSP 56F805包含PWM、故障保护、程序和数据Flash等模块。采用标么值系统可以提高运算精度,并可使各种容量电机的物理量及控制系统中各调节器的参数范围大致相同。DSP程序通过判断指令所在扇区、计算占空比等步骤产生PWM波。将PWM波经LC滤波得到实验波形,验证了利用DSP 56F805实现SVPWM的可行性。

Space vector pulse width modulation （SVPWM） is a novel control strategy that controls the converter by switching the space vector of the converter＇s voltage （or current）. An implementation way of SVPWM is introduced in detail of which how to be realized by the DSP 56F805 produced by Freescale Semiconductor, Inc. The DSP 56F805 includes PWM module, Fault protection module Program Flash and Data Flash module, etc. The per unit value system can improve the calculation precision, and conduce to the same range approximately either the physical quantities of the motors of the diversified capacity or the parameters of the controllers used in the control system. The PWM signals are generated by the DSP program, and the DSP program contains the modules of sector distinguish, duty ratio calculation, and so on. The waveforms that the PWM signals are filtered by LC filter conducted verify that the approach based on DSP 56F805 is feasible.