A novel controller for switching audio power amplifier with digital input

Author

Park, Jong-Hu ; Kim, Chang G. ; Jeong, Jae-hoon ; Cho, Bo H.

Author_Institution

Dept. of Electr. Eng., Seoul Nat. Univ., South Korea

Volume

1

fYear

2002

fDate

2002

Firstpage

39

Abstract

A new controller, using bi-directional saw-tooth error correction (BSEC) for switching audio power amplifiers with digital PWM input is proposed. This control method is based on a pulsed edge correction approach using PWM audio signal input as a reference for power switching digital to analog converter. The proposed controller has excellent features such as wide error correction range and no limitation on the modulation index. The controller is implemented in the half-bridge class D amplifier and the performance is verified through hardware experiments. It delivers 100W into 4Ω load with less than 0.2% of total harmonic distortion (THD) all over operating range with the maximum efficiency of 82%.

Keywords

PWM power convertors; audio-frequency amplifiers; bridge circuits; digital-analogue conversion; error correction; harmonic distortion; power amplifiers; power conversion harmonics; switching circuits; 100 W; 4 ohm; 82 percent; bi-directional saw-tooth error correction; digital PWM input; digital input switching audio power amplifier controller; digital to analog converter; half-bridge class D amplifier; pulsed edge correction approach; total harmonic distortion; Digital signal processing; Error correction; Linearity; Nonlinear distortion; Output feedback; Phase change materials; Power amplifiers; Pulse amplifiers; Pulse width modulation; Pulse width modulation converters;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 2002. pesc 02. 2002 IEEE 33rd Annual

Print_ISBN

0-7803-7262-X

Type

conf

DOI

10.1109/PSEC.2002.1023844

Filename

1023844