Title :
PWM-based multilevel class-D amplifier with integrated over-current protection system
Author :
Lin, Chun Wei ; Hsieh, Bing Shiun ; Chung, Chih Wei
Author_Institution :
Dept. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Yunlin, Taiwan
Abstract :
In this work, we present a multilevel class-D amplifier with integrated over-current protection system based on pulse-width-modulation (PWM). The multilevel technique is composed of a multilevel converter and a time division adder followed by modulator. The modulated signal is fixed into several time divisions and then be integrated and encoded to a set of parallel control signal for multilevel converter. Furthermore, the pulse density adjustment circuit dynamically adjusts the power delivery according to over-current detection. Under the protection scheme, the amplifier is able to completely eliminate audio holes and continue working well without sacrificing total-harmonic-distortion (THD) and power efficiency. The experiment results show that the losses of THD and power efficiency are within 10dB and 2% which significantly improves audio holes effect.
Keywords :
PWM power convertors; adders; amplifiers; harmonic distortion; overcurrent protection; PWM-based multilevel class-D amplifier; audio hole effect; integrated overcurrent protection system; multilevel converter; overcurrent detection; parallel control signal; pulse density adjustment circuit; pulsewidth modulation; time division adder; total harmonic distortion; Circuits; Power amplifiers; Power supplies; Power system protection; Power transistors; Pulse amplifiers; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Voltage; PWM; audio holes; class-D amplifier; multilevel converter; over-current protection system;
Conference_Titel :
Industrial Electronics and Applications (ICIEA), 2010 the 5th IEEE Conference on
Conference_Location :
Taichung
Print_ISBN :
978-1-4244-5045-9
Electronic_ISBN :
978-1-4244-5046-6
DOI :
10.1109/ICIEA.2010.5514872
