Real-time low-distortion digital PWM modulator for switching converters
A compensation scheme to reduce the inherent baseband distortion in uniform PWM modulators (UPWM) is presented in this paper. The method is based on real-time mapping of the switching times of UPWM to those of natural PWM that, as it is well-known, exhibits far less in-band distortion. Two alternati...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/139375 |
| Acceso en línea: | http://hdl.handle.net/11336/139375 |
| Access Level: | acceso abierto |
| Palabra clave: | FIELD PROGRAMMABLE GATE ARRAYS HARMONIC DISTORTION PULSE WIDTH MODULATION SWITCHING CONVERTERS https://purl.org/becyt/ford/2.2 https://purl.org/becyt/ford/2 |
| Sumario: | A compensation scheme to reduce the inherent baseband distortion in uniform PWM modulators (UPWM) is presented in this paper. The method is based on real-time mapping of the switching times of UPWM to those of natural PWM that, as it is well-known, exhibits far less in-band distortion. Two alternatives are presented: one based on an exact, analytic algorithm recently reported in the literature, and another one that uses an artificial neural network (ANN). Both methods are designed for arbitrary, band-limited modulating signals and they are not restricted to single-frequency sinusoids, as other techniques presented in the literature. Simulation results and experimental measurements of a FPGA implementation demonstrate a significant reduction of the distortion in real-time applications. The performance of both alternatives is compared for several modulating signals, and the results of industry-standard distortion tests are also reported. Finally, some guidelines for choosing the best alternative for ASIC or FPGA implementations are provided |
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