EPE Association: NORpie 2004

NORpie 2004 - Topic 11: Audio
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2004 > NORpie 2004 - Topic 11: Audio

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   High Bandwidth Automotive Power Supply for Low-cost PWM Audio Amplifiers
By M. C. W. Höyerby; D. R. Andersen; M. A. E. Andersen; L. Petersen [View]
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Abstract: This paper presents the derivation of a practical solution for constructing a signal tracking power supply for single-ended switching audio amplifiers, motivated by requirements for reduced EMI. The cause and effects of ‘supply pumping’ in single-ended switching amplifiers are investigated, and simulation results for a power supply to meet the specified demands are presented, as well as the results obtained from the constructed prototype.

   Integrating switch mode audio power amplifiers and electro dynamic loudspeakers for a higher power efficiency
By S. Poulsen; M. A. E. Andersen [View]
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Abstract: The work presented in this paper is related to integration of switch mode audio amplifiers and electro dynamic loudspeakers, using the speaker's voice coil as output filter, and the magnetic structure as heatsink for the amplifier.

   Hysteresis Controller with constant switching frequency
By S. Poulsen; M. A. E. Andersen [View]
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Abstract: Switch mode audio power amplifiers are showing up on market in still greater numbers because of advantages in form of high efficiency and low total system cost, especially for high power amplifiers. Several different modulator topologies have been made, ranging from standard PWM to various self oscillating and digital modulators. Performance in terms of low distortion, noise and dynamic range differs significantly with the modulator topology used. Highest system performance is generally achieved with analog modulators made as a modulator loop including at least the power stage of the amplifier, because of benefits from continuous time operation and non-quantized resolution. This type of modulator uses no external carrier signal, and is called self oscillating modulators. The work presented in this paper refers to switch mode audio amplifier, but can be used within a wide range of DC-DC or DC- AC converters as well.

   Single conversion audio amplifier and DC-AC converters with high performance and low complexity control scheme
By S. Poulsen; M. A. E. Andersen [View]
[Download]

Abstract: This paper proposes a novel control topology for a mains isolated single conversion audio amplifier and DC-AC converters. The topology is made for use in audio applications, and differs from prior art in terms of significantly reduced distortion as well as lower system complexity. The topology can be useful in a wide range of DC-AC applications such as motor drives or UPS systems requiring mains isolation as well.

   Safe-commutation principle for direct single-phase AC-AC converters for use in audio power amplification
By P. Ljusev; M.A.E. Andersen [View]
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Abstract: This paper presents an alternative safe commutation principle for a single phase bidirectional bridge, for use in the new generation of direct single-stage AC-AC audio power amplifiers. As compared with the bridge commutation with load current or source voltage sensing, in this approach it is not required to do any measurements, thus making it more reliable. Initial testing made on the prototype prove the feasibility of the approach.

NORpie 2004 - Topic 11: Audio
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2004 > NORpie 2004 - Topic 11: Audio
	[return to parent folder]

	High Bandwidth Automotive Power Supply for Low-cost PWM Audio Amplifiers By M. C. W. Höyerby; D. R. Andersen; M. A. E. Andersen; L. Petersen	[View] [Download]
Abstract: This paper presents the derivation of a practical solution for constructing a signal tracking power supply for single-ended switching audio amplifiers, motivated by requirements for reduced EMI. The cause and effects of ‘supply pumping’ in single-ended switching amplifiers are investigated, and simulation results for a power supply to meet the specified demands are presented, as well as the results obtained from the constructed prototype.

	Integrating switch mode audio power amplifiers and electro dynamic loudspeakers for a higher power efficiency By S. Poulsen; M. A. E. Andersen	[View] [Download]
Abstract: The work presented in this paper is related to integration of switch mode audio amplifiers and electro dynamic loudspeakers, using the speaker's voice coil as output filter, and the magnetic structure as heatsink for the amplifier.

	Hysteresis Controller with constant switching frequency By S. Poulsen; M. A. E. Andersen	[View] [Download]
Abstract: Switch mode audio power amplifiers are showing up on market in still greater numbers because of advantages in form of high efficiency and low total system cost, especially for high power amplifiers. Several different modulator topologies have been made, ranging from standard PWM to various self oscillating and digital modulators. Performance in terms of low distortion, noise and dynamic range differs significantly with the modulator topology used. Highest system performance is generally achieved with analog modulators made as a modulator loop including at least the power stage of the amplifier, because of benefits from continuous time operation and non-quantized resolution. This type of modulator uses no external carrier signal, and is called self oscillating modulators. The work presented in this paper refers to switch mode audio amplifier, but can be used within a wide range of DC-DC or DC- AC converters as well.

	Single conversion audio amplifier and DC-AC converters with high performance and low complexity control scheme By S. Poulsen; M. A. E. Andersen	[View] [Download]
Abstract: This paper proposes a novel control topology for a mains isolated single conversion audio amplifier and DC-AC converters. The topology is made for use in audio applications, and differs from prior art in terms of significantly reduced distortion as well as lower system complexity. The topology can be useful in a wide range of DC-AC applications such as motor drives or UPS systems requiring mains isolation as well.

	Safe-commutation principle for direct single-phase AC-AC converters for use in audio power amplification By P. Ljusev; M.A.E. Andersen	[View] [Download]
Abstract: This paper presents an alternative safe commutation principle for a single phase bidirectional bridge, for use in the new generation of direct single-stage AC-AC audio power amplifiers. As compared with the bridge commutation with load current or source voltage sensing, in this approach it is not required to do any measurements, thus making it more reliable. Initial testing made on the prototype prove the feasibility of the approach.