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A. Knott, and LA. PR. Petersen, "Comparison of Power Supply Pumping of Switch-Mode Audio Power Amplifiers with Resistive Loads and Loudspeakers as Loads," Paper 8838, (2013 May.). doi: A. Knott, and LA. PR. Petersen, "Comparison of Power Supply Pumping of Switch-Mode Audio Power Amplifiers with Resistive Loads and Loudspeakers as Loads," Paper 8838, (2013 May.). doi:
Abstract: Power supply pumping is generated by switch-mode audio power amplifiers in half-bridge configuration, when they are driving energy back into their source. This leads in most designs to a rising rail voltage and can be destructive for either the decoupling capacitors, the rectifier diodes in the power supply or the power stage of the amplifier. Therefore precautions are taken by the amplifier and power supply designer to avoid those effects. Existing power supply pumping models are based on an ohmic load attached to the amplifier. This paper shows the analytical derivation of the resulting waveforms and extends the model to loudspeaker loads. Measurements verify that the amount of supply pumping is reduced by a factor of four when comparing the nominal resistive load to a loudspeaker. A simplified and more accurate model is proposed and the influence of supply pumping on the audio performance is proven to be marginal.

@article{knott2013comparison,
author={knott, arnold and petersen, lars press},
journal={journal of the audio engineering society},
title={comparison of power supply pumping of switch-mode audio power amplifiers with resistive loads and loudspeakers as loads},
year={2013},
volume={},
number={},
pages={},
doi={},
month={may},} @article{knott2013comparison,
author={knott, arnold and petersen, lars press},
journal={journal of the audio engineering society},
title={comparison of power supply pumping of switch-mode audio power amplifiers with resistive loads and loudspeakers as loads},
year={2013},
volume={},
number={},
pages={},
doi={},
month={may},
abstract={power supply pumping is generated by switch-mode audio power amplifiers in half-bridge configuration, when they are driving energy back into their source. this leads in most designs to a rising rail voltage and can be destructive for either the decoupling capacitors, the rectifier diodes in the power supply or the power stage of the amplifier. therefore precautions are taken by the amplifier and power supply designer to avoid those effects. existing power supply pumping models are based on an ohmic load attached to the amplifier. this paper shows the analytical derivation of the resulting waveforms and extends the model to loudspeaker loads. measurements verify that the amount of supply pumping is reduced by a factor of four when comparing the nominal resistive load to a loudspeaker. a simplified and more accurate model is proposed and the influence of supply pumping on the audio performance is proven to be marginal.},}

TY - paper
TI - Comparison of Power Supply Pumping of Switch-Mode Audio Power Amplifiers with Resistive Loads and Loudspeakers as Loads
SP - EP -
AU - Knott, Arnold
AU - Petersen, Lars Press
PY - 2013
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2013 TY - paper
TI - Comparison of Power Supply Pumping of Switch-Mode Audio Power Amplifiers with Resistive Loads and Loudspeakers as Loads
SP - EP -
AU - Knott, Arnold
AU - Petersen, Lars Press
PY - 2013
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2013
AB - Power supply pumping is generated by switch-mode audio power amplifiers in half-bridge configuration, when they are driving energy back into their source. This leads in most designs to a rising rail voltage and can be destructive for either the decoupling capacitors, the rectifier diodes in the power supply or the power stage of the amplifier. Therefore precautions are taken by the amplifier and power supply designer to avoid those effects. Existing power supply pumping models are based on an ohmic load attached to the amplifier. This paper shows the analytical derivation of the resulting waveforms and extends the model to loudspeaker loads. Measurements verify that the amount of supply pumping is reduced by a factor of four when comparing the nominal resistive load to a loudspeaker. A simplified and more accurate model is proposed and the influence of supply pumping on the audio performance is proven to be marginal.