Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A novel controller for switching audio power amplifier with digital input

디지털 PWM 입력 D급 음향 증폭기를 위한 새로운 제어기법

  • Park, Jong-Hu (School of Electrical Engineerng, Seoul National University) ;
  • Kim, C.G. (School of Electrical Engineerng, Seoul National University) ;
  • Cho, B.H. (School of Electrical Engineerng, Seoul National University)
  • Published : 2002.07.10
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Abstract

A new controller for switching audio power amplifier with digital PWM input is proposed- Bi-directional Saw-tooth Error Correction (BSEC). This control method for high quality switching amplifier is based on a pulsed edge correction approach using PWM audio signal input as a reference of 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 4${\Omega}$ load with less than 0.2% of total harmonic distortion (THD) all over operating range and an maximum efficiency of 82%.

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