High dynamic class-D power amplifier

Himmelstoss, Felix A.; Edelmoser, K.H.

doi:10.1109/30.735834

Cited by 22 publications

(5 citation statements)

References 2 publications

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“…As a switched system, these amplifiers theoretically have perfect efficiency and in practice efficiencies of 85-90% [1] have been demonstrated at audio frequencies and over 70% [2] at RF's. These systems have been used for many years in audio applications [3], but there is increasing interest in using this technology in mobile wireless applications where power efficiency is a critical parameter.…”

Section: Introductionmentioning

confidence: 99%

“…These systems have been developed for low frequency applications, such as audio, as the switching frequency has to be many times that of the bandwidth of interest. These low-frequency amplifiers have been called Class-D amplifiers [3]. Recently there has been interest in using bandpass modulated bitstreams for use in RF systems, where they are often called Class-S amplifiers [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Using high pass sigma-delta modulation for Class-S power amplifiers

Ralph

Farrell

2007

2007 18th European Conference on Circuit Theory and Design

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Switching power amplifiers offer the potential for superior efficiencies if used at radio frequencies. However many existing bandpass architectures require a switching frequency four times that of the signal, making implementation difficult. In this paper we propose to use a high-pass sigma-delta modulator to reduce the switching rate to only twice of the signal. We will present a solution to the problem of the reflected image and demonstrate it's viability for use in mobile telephony.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using high pass sigma-delta modulation for Class-S power amplifiers

Ralph

Farrell

2007

2007 18th European Conference on Circuit Theory and Design

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“…7a). A first option to do so couples the compensation voltage via a transformer into the main power flow path [106], [136], as done for decades in power grid applications [112], [135]. This concept has recently been applied to a grid simulation system in [137], [138], where a standard 400 V, 5 kVA IGBT inverter is combined with a 100 V MOSFET inverter that is responsible for generating higher-order harmonics.…”

Section: ) Series Configurationmentioning

confidence: 99%

Ultra-High-Bandwidth Power Amplifiers: A Technology Overview and Future Prospects

Bohler¹,

Huber²,

Wurz³

et al. 2022

IEEE Access

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Testing of power electronic converters can advantageously be carried out in power-hardwarein-the-loop (P-HIL) environments that emulate the behavior of power grids, electric motors, etc. The interface between the model and the device under test requires a power amplifier whose bandwidth ultimately limits the accuracy of the emulation. Hence, there is a need for general-purpose AC power amplifiers with ultra-high power bandwidth. This paper first provides a comprehensive review of amplifier concepts proposed over the past decades, i.e., linear power amplifiers, switch-mode amplifiers, including advanced variants such as multilevel (parallel-interleaving) and multicell (series-interleaving) topologies, as well as hybrid approaches that, e.g., combine analog and switch-mode stages. Based on this review, the two key concepts (parallelinterleaving of bridge-legs and cascading of converter cells) that facilitate high efficiency and ultra-high power bandwidth are identified and discussed, covering also suitable isolated mains interfaces and control considerations. Finally, we present a three-phase amplifier system that uses six cascaded converter cells per phase to realize an effective switching frequency of 3.6 MHz. The prototype thus achieves a measured power bandwidth of 100 kHz at the nominal phase output voltage of 230 V rms, and an output power of up to 10 kW per phase.INDEX TERMS Power-hardware-in-the-loop (P-HIL), grid emulation, motor emulation, power amplifier topologies, switch-mode power amplifier, ultra-high-bandwidth power amplifier.

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“…The LPF has been applied before the amplifier which cleans out any noise higher than 24.9 kHz. The audio power amplifier of Class D type is highly efficient and suitable for the application of low power portable products [10].…”

Section: Audiomentioning

confidence: 99%

Design and Implementation of Low-price Business Card-size Portable Digital TV Set through High Integration DVB-T Solution

Bai

Lin

2007

2007 IEEE International Symposium on Consumer Electronics

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In this paper we provide a system design method to solve the problem of developing a miniaturized portable digital TV set. For such a portable device it is very important to reduce power consumption and extend operation time while the battery is the only power source in the system. The hardware circuitry shall be relatively compact according to the high integration of the system-on-chip (SOC) and the proper selection of key components. Not only miniaturization can be realized but also cost and power dissipation of the system decreased. Whether the implementation can be achieved also depends on antenna efficiency and DVB-T receiver performance. Therefore it is vital to select the right radio frequency architecture, which affects signal reception and power consumption. Based on the demands mentioned above we have chosen single conversion architecture for the receiver. Furthermore, our design has a better performance than earlier designs because of the use of a shielding case and the appropriate filtering of power ripples. Our efforts aim at making the antenna wideband, small-sized, low-profile, lowcost and omnidirectional. We implement the built-in antenna body by means of the printed circuit board at low cost. Meanwhile the spiral antenna is a good choice to fulfil the requirements of a wideband omnidirectional radiation pattern. Moreover, a heat sink conducts the heat outward and thus prevents overheating, ensuring operational safety.

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High dynamic class-D power amplifier

Cited by 22 publications

References 2 publications

Using high pass sigma-delta modulation for Class-S power amplifiers

Using high pass sigma-delta modulation for Class-S power amplifiers

Ultra-High-Bandwidth Power Amplifiers: A Technology Overview and Future Prospects

Design and Implementation of Low-price Business Card-size Portable Digital TV Set through High Integration DVB-T Solution

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