This Application Note shows how the capture/compare units of the C504, C508, C868,
and C164CI can be used to implement space vector modulation for three-phase voltage
control inverter applications. Space vector modulation is widely considered to be
superior to other forms of sinusoidal PWM. A simple algorithm for overmodulation is
also demonstrated.
1 Introduction..3
2 Sinusoidal Voltage Generation and Capture/Compare Units ...5
3 Methods of Generating Sinusoidal Voltages7
3.1 Sinusoidally Weighted PWM (SWPWM)7
3.2 Space Vector Modulation (SVM).9
3.3 Overmodulation ..17
4 Microcontroller Implementation of SVM .19
4.1 Variable Scaling/Resolution and Optimized Software Structure 20
4.2 SVM Implementation Options ...23
4.3 Results and Conclusions 24
Appendix .28
A SVM.a51...28
B REGC504.inc .39
C REGC508.inc .42