The implementation of a transient DC-link boost based digital amplifier for eliminating pulse-dropping distortion

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Journal / PublicationProceedings - IEEE International Symposium on Circuits and Systems
Volume5
Publication statusPublished - 2004

Conference

Title2004 IEEE International Symposium on Cirquits and Systems - Proceedings
PlaceCanada
CityVancouver, BC
Period23 - 26 May 2004

Abstract

A transient dc-link boost technique for avoiding pulse dropping in digital amplifiers is presented. The concept is based on increasing the dc link voltage and reducing the modulation index momentarily, when the modulating signal is large. Apart from effectively reducing harmonic distortion at the output, the proposed method can also widen the dynamic modulation range and thus reduce the required supply voltage. A 10W prototype with an H-bridge inverter has been built. Some pulses are artificially dropped in the gate signals to simulate the pulse-dropping effect. The inverter output harmonic spectra with and without the transient boost have been compared.