An 87% Peak Efficiency, 37W, Class H Audio Amplifier with GaN Output Stage

Utomo, Nardi; Siek, Liter; Yap, H. G.; Disney, Don; Selvaraj, Lawrence; Peng, Lulu

doi:10.1109/norchip.2018.8573508

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Audio power amplifiers constitute a mature field in technology, where relentless efforts have been made over decades, resulting in significant progress in circuit technology, components, and conceptual understanding. Reflecting on the developmental journey of power amplifiers can be intriguing for audio enthusiasts [1] [2].…”

Section: Introductionmentioning

confidence: 99%

A Low Frequency Power Amplifier Design Based on Output CapacitorLess Circuit

Ding,

Huang,

Zhang

et al. 2024

AJST

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This low-frequency power amplifier utilizes the AT89S51 microcontroller as the main control chip. The system can be divided into several modules: power amplification circuit module, pre-amplification module, band-stop filtering module, protection circuit module, volume control module, power supply voltage, AC voltage, and AC current testing module, A/D conversion module, power module, and single-chip microcomputer subsystem control module. We chose class AB audio power amplifiers. To ensure circuit stability and higher fidelity, we selected the TDA2030 integrated chip to build the OCL power amplifier circuit, preventing efficiency from being too low. Through the control of single-chip microcomputer subsystem, it can measure and display output power, the supply power of the DC power source, and overall efficiency. This system utilizes electronic switches connected with band-stop filters, with the band-stop frequency ranging from 40～60Hz.

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Section: Introductionmentioning

confidence: 99%

A Low Frequency Power Amplifier Design Based on Output CapacitorLess Circuit

Ding,

Huang,

Zhang

et al. 2024

AJST

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show abstract

“…When both positive and negative supply rails are available, they both stay fixed at low absolute voltages for small output level; and one of them tracks the output with an offset, when the output level exceeds certain thresholds [18], [19]. The same approach can be implemented in a fully-differential bridge configuration with a single supply rail [20]- [22], where a bootstrapping amplifier topology has been proposed to further improve efficiency and linearity [23].…”

Section: Introductionmentioning

confidence: 99%

Class–CTA: Concept and Theoretical Analysis of a High Linearity and Efficiency Power Stage Architecture

Baxevanakis,

Nikitas,

Sotiriadis

2023

IEEE Open J. Circuits Syst.

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This work presents a power stage architecture that combines high-linearity with highefficiency. The power stage is configured as a push-pull Class-A topology with two buck-converters providing its supply rails. The buck-converters continuously track the stage's output with a small constant margin, creating a minimum, constant voltage drop on the output devices; thus, the stage's efficiency is increased and its linearity is improved. Theoretical analysis of the topology and its feedback control are presented, while a design example is implemented and simulated in Cadence Spectre as proof-of-concept.

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Improving Efficiency of AB-Class Audio Power Amplifier Using Thermoelectric Generators

Marinović,

Škalic

2024

Electronics

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Since circuit-based solutions for increasing the efficiency of Class AB audio amplifiers have reached their peak, this article presents a non-circuit-based approach for the same purpose. The output transistors of this class of amplifiers dissipate a significant amount of thermal energy, resulting in relatively low amplifier efficiency and requiring the transistors to be mounted on large heatsinks. This study was conducted with the aim of capturing the waste heat energy dissipated by the output transistors and converting it into electrical energy using thermoelectric generators (TEGs), which can then be used to increase the efficiency of the amplifier system. In addition to improving efficiency, this study aims to determine the extent to which heatsinks with smaller dimensions can be used in combination with the amplifier through the use of TEGs, potentially leading to a wider commercial application of Class AB audio amplifiers. The experimental results show that the thermoelectric conversion efficiency of TEGs reached 1.097% in the best case, indicating a potential increase of 0.275% in the overall efficiency of the amplifier system. These results show that the low thermoelectric efficiency of TEGs is a limiting factor that prevents a breakthrough in improving the efficiency of the power amplifier system with the proposed non-circuit-based approach.

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An 87% Peak Efficiency, 37W, Class H Audio Amplifier with GaN Output Stage

Cited by 3 publications

References 5 publications

A Low Frequency Power Amplifier Design Based on Output CapacitorLess Circuit

A Low Frequency Power Amplifier Design Based on Output CapacitorLess Circuit

Class–CTA: Concept and Theoretical Analysis of a High Linearity and Efficiency Power Stage Architecture

Improving Efficiency of AB-Class Audio Power Amplifier Using Thermoelectric Generators

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