Title :
An anti-clipping protection system for multilevel class-D amplifier
Author :
Lin, Chun Wei ; Hsieh, Bing Shiun
Author_Institution :
Dept. of Electron. Eng., Nat. Yunlin Univ. of Sci. & Technol., Yunlin, Taiwan
Abstract :
Class D amplifier is a popular device because of its high power delivery efficiency. However, during practical application, the "clipping" problem aggravates power loss and reduces reliability. We therefore present an anti-clipping protection system incorporated with proposed PWM-based multilevel class-D amplifier to enhance the audio quality and reliability. The multilevel technique consists of a time-division adder and a multilevel converter to generate and deliver multilevel signal as stairway. In addition, the pulse density adjustment technique dynamically adjusts the power delivery according to the results of the anti-clipping detection circuit. Under the protection operation, experiments results show that the intensity and excessive heat of "clipping" will be greatly reduced over 25% and 40% which demonstrate the effectiveness of proposed scheme.
Keywords :
audio-frequency amplifiers; power amplifiers; Class D amplifier; PWM; anti-clipping detection circuit; anti-clipping protection system; audio quality; multilevel Class-D amplifier; multilevel converter; multilevel signal; pulse density adjustment technique; reliability; time-division adder; Bismuth; PWM; anti-clipping protection; class-D audio amplifiers; clipping; multilevel converter;
Conference_Titel :
Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2011 8th International Conference on
Conference_Location :
Khon Kaen
Print_ISBN :
978-1-4577-0425-3
DOI :
10.1109/ECTICON.2011.5947788