Extension of Pulsewidth Modulation From Carrier-Based to Dither-Based
| Autor: | Sing-Han Wang, Shiang-Hwua Yu, Ting-Yu Wu |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Pulse-frequency modulation
Noise (electronics) Computer Science Applications Delta modulation Control and Systems Engineering Pulse-amplitude modulation Control theory Binary offset carrier modulation Electronic engineering Dither Electrical and Electronic Engineering Frequency modulation Pulse-width modulation Information Systems Mathematics |
| Zdroj: | IEEE Transactions on Industrial Informatics. 9:1029-1036 |
| ISSN: | 1941-0050 1551-3203 |
| DOI: | 10.1109/tii.2012.2220555 |
| Popis: | The carrier-based pulsewidth modulation (PWM) is extended to a dither-based PWM by replacing a conventional triangular carrier with a binary dither signal. Such a simple extension is generally impractical due to serious performance degradation. However, this paper presents a novel binary dither generator that helps enhance the performance of the dither-based PWM and makes the idea possible. The binary dither is generated as determined by the sign of the filtered modulation noise. The dither generated in this way automatically eliminates low-frequency modulation noise and randomizes the switching frequency. As indicated by experiments, the resulting dither-based PWM has relatively lower THD+N and less pronounced high-frequency switching harmonics, as compared with the conventional fixed-frequency triangular carrier PWM. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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