Title :
The implementation of a transient DC-link boost based digital amplifier for eliminating pulse-dropping distortion
Author :
Chiu, Y.C. ; Chung, Henry S H ; Lau, W.H. ; Zhou, B.
Author_Institution :
Dept. of Electron. Eng., Hong Kong City Univ., China
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 10 W 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.
Keywords :
PWM invertors; amplifiers; harmonic analysis; harmonic distortion; 10 W; H-bridge inverter; dc link voltage; digital amplifier; dynamic modulation range; gate signals; harmonic distortion reduction; harmonic spectra; modulating signal; modulation index reduction; pulse-dropping distortion; supply voltage reduction; transient DC-link boost; Dynamic range; Harmonic distortion; Phase change materials; Prototypes; Pulse amplifiers; Pulse modulation; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Voltage;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1329945
