A 4Ω 2.65W Class-D Audio Amplifier With Embedded DC-DC Boost Converter, Current Sensing ADC and DSP for Adaptive Speaker Protection

Berkhout, Marco; Dooper, L.; Krabbenborg, B.H.; Somberg, J.

doi:10.1109/jssc.2013.2284692

Cited by 30 publications

(15 citation statements)

References 4 publications

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“…16(b), the gate-source voltage of M P1 is designed to be identical in Fig. 16(a) by using a large aspect ratio and thus the current I 1 can be derived as (10) to stand for the square value of V ep .…”

Section: A Peak Value Generatormentioning

confidence: 99%

See 1 more Smart Citation

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Chen

Lin

et al. 2016

IEEE Trans. Power Electron.

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this paper proposes a high efficiency Class-D amplifier (CDA) with embedded singleinductor bipolar output (SIBO) power module. The characteristics of SIBO converter's bipolar outputs not only suppress equivalent common mode noise but also remove several large external bulky components in conventional boost supply CDA systems. Since bipolar outputs in the SIBO provide independent driving capability, CDA is capable to operate in both single-ended (SE) and bridge-tide load (BTL) configurations. Furthermore, the proposed dynamic voltage boosting (DVB) technique adjusts the SIBO output voltage level according to the CDA's output level with 5% power efficiency improvement. Peak total harmonic distortion plus noise (THD+N) performance is 0.012%. Peak power efficiency of SIBO and CDA are 89% and 93.2%, respectively.

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Section: A Peak Value Generatormentioning

confidence: 99%

“…Thus, several prior arts have worked out the integration of CDA with the boost converter to meet CDA power requirement as shown in Fig. 1 [6]- [10].…”

Section: Introductionmentioning

confidence: 99%

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Chen

Lin

et al. 2016

IEEE Trans. Power Electron.

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“…High boost DC/DC (direct current to direct current) voltage conversions are indispensable in a power electronic interface of certain low-voltage DC-powered electrical devices, including audio amplifiers [1][2][3][4][5][6][7], high intensity discharge (HID) lamps [8][9][10][11][12][13][14], uninterruptible power supplies (UPS) [15][16][17][18][19], and electric vehicle systems [20][21][22][23][24][25][26][27][28][29][30][31][32]. For such high voltage gain application, the conventional boost converter have to works for extremely wide duty cycle which increases power consumption and has low reliability problems [32,33].…”

Section: Introductionmentioning

confidence: 99%

A New Combined Boost Converter with Improved Voltage Gain as a Battery-Powered Front-End Interface for Automotive Audio Amplifiers

et al. 2017

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High boost DC/DC voltage conversion is always indispensable in a power electronic interface of certain battery-powered electrical equipment. However, a conventional boost converter works for a wide duty cycle for such high voltage gain, which increases power consumption and has low reliability problems. In order to solve this issue, a new battery-powered combined boost converter with an interleaved structure consisting of two phases used in automotive audio amplifier is presented. The first phase uses a conventional boost converter; the second phase employs the inverted type. With this architecture, a higher boost voltage gain is able to be achieved. A derivation of the operating principles of the converter, analyses of its topology, as well as a closed-loop control designs are performed in this study. Furthermore, simulations and experiments are also performed using input voltage of 12 V for a 120 W circuit. A reasonable duty cycle is selected to reach output voltage of 60 V, which corresponds to static voltage gain of five. The converter achieves a maximum measured conversion efficiency of 98.7% and the full load efficiency of 89.1%.

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“…In comparison to linear amplifiers, class-D switching amplifiers ( Fig. 1.6) can offer a much higher maximum power efficiency [8]- [23]. Their superior efficiency can be attributed to the switching nature of the output stage, where the continuous V-I overlap loss in the output transistors is eliminated.…”

Section: Switching Class-d Amplifiersmentioning

confidence: 99%

“…Thus ideally class-D output stages have no dissipation and their power efficiency is 100%. For this reason, class-D amplifiers have gained popularity and are widely adopted for audio power amplification, both for high-power [8]- [14] and low-power [15]- [23] applications.…”

Section: Switching Class-d Amplifiersmentioning

confidence: 99%

High-voltage class-D power amplifiers

Ma¹

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Nowadays transducers are ubiquitous as interfaces between the increasingly digital world and the real physical world. The same holds for the power amplifiers driving them. This thesis focuses on the design and optimization of high-voltage class-D amplifiers, which are used for driving capacitive piezoelectric actuator loads in active vibration/noise control applications.The main objective is to further enhance class-D power efficiency compared to existing class-D designs.To gain insight in class D power efficiency, a detailed analysis of high-voltage class-D dissipation sources is performed and a dissipation model including all the major dissipation sources is developed. The analysis shows that switching loss is a potential dominating dissipation source in high-voltage applications, while its contribution can be minimized by fast switching to eliminate V-I overlap losses. Moreover, it is shown that when varying the class-D switching frequency, a minimum total dissipation exists, with the optimal switching frequency depending on the output power. Furthermore, idle loss reduction by increasing the switching frequency and inserting a dead time to the power stage is backed by the analysis.Following the analysis, a fast-switching power stage is designed to aim for switching loss minimization. This output stage design features immunity to the on-chip supply bounce, realized by internally regulated floating supplies, variable driving strength for the gate driver, and an efficient 2-step level shifter design. Fast switching transitions and low switching loss are achieved with 94% peak efficiency for the complete class-D power stage in the realized chip. In addition, gate driver sizing procedures for the class-D output stage are discussed, showing that the variable gate driving strength can greatly improve efficiency when on-chip supply bounce is the limiting factor.Also based on the dissipation analysis, this thesis describes the design of an efficiencyimproved high-voltage class-D power amplifier. The amplifier adaptively regulates its

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A 4Ω 2.65W Class-D Audio Amplifier With Embedded DC-DC Boost Converter, Current Sensing ADC and DSP for Adaptive Speaker Protection

Cited by 30 publications

References 4 publications

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

Embedded Single-Inductor Bipolar-Output DC–DC Converter in Class-D Amplifier for Low Common Noise

A New Combined Boost Converter with Improved Voltage Gain as a Battery-Powered Front-End Interface for Automotive Audio Amplifiers

High-voltage class-D power amplifiers

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