| |
Digitally Implemented Novel Technique to Approach Natural Sampling SPWM
| [View]
[Download]
|
| Author(s) |
Mohan Renge, Hiralal Suryawanshi, Madhuri Chaudhari |
| Abstract |
Digital signal processor (DSP) based sinusoidal pulse width modulation (SPWM) uses symmetrical and asymmetrical regular sampling. These samplings do not attain the performance of natural SPWM at low sampling. This paper presents a simple technique using digital sampling to approach naturally sampled SPWM. The proposed technique samples the modulating waveform at every peak of the triangular carrier signal and calculates precise magnitude of modulating signal for the instant of intersection. This signal has enough information to minimize the error in switching instant. The original modulating signal appears in the PWM output spectra unattenuated, without any distortion components, and without phase delay, regardless of the frequency or modulation depth of that signal. The presented technique is suitable
for real time implementation using commercial DSP. This technique is also applicable to multilevel inverter and does
not generate superfluous pulses like asymmetrical sampling in the output voltage of multilevel inverter. Simulation and experimental results are presented to demonstrate and confirm the validity of the proposed technique. |
| Download |
| Filename: | Unnamed file |
| Filesize: | 351.5 KB |
|
| Type |
Members Only |
| Date |
Last modified 2010-06-02 by System |
| |
 |