用TMS320C24xDSP减少电磁干扰

本应用指南讨论了如何应用TI公司的TMS320C24x DSP减少数字电动机控制应用中的电磁干扰。

Contents
Design Problem.................................................................2
Solution...............................................................................2
Figures
Figure 1. Proposal for a TMS320F241-FN Single Layer PCB Layout ...................................................3
Figure 2. FFT (10 Average) of a Fixed 20kHz PWM Carrier Frequency................................................6
Figure 3. FFT (10 Averages) of a 20kHz with +/- 2kHz Random-Noise-Modulated PWM Carrier
Frequency......................................................6
Tables
Table 1. Comparison between Asymmetric, Symmetric and Space Vector PWM......................4
Examples
Example 1. Code Listing of Symmetric/Space Vector PWM Initialization.......................5
Example 2. Code Listing of PWM Carrier Modulation...................................7
Example 3. Code Listing of wobble_random()...........................................................8
Example 4. Code Listing Updating the Space Vector PWM, SV_PWM_Update().............9
Example 5. C24x PWM Register C Declaration (Macros), c240.h....................................10