Design Considerations for Hybrid, Energy-Efficient, and Fast Industrial Power Amplifiers With Supply Modulation

Lazarevic, Vladan Z.; Vasić, Miroslav; Boere, Eric; Eltze, Jens; Cobos, J.A.

doi:10.1109/jestpe.2020.2975553

Cited by 4 publications

(1 citation statement)

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“…However, the large-signal bandwidth of 1 kHz is essentially limited by the bandwidth of the tracking power supply. Therefore, the approach is rarely used for power amplifiers as considered here, but mainly for low-power or special applications such as driving piezoelectric transducers [133]. Note that envelopetracking power supplies in radio-frequency (RF) applications are used to vary the supply voltage of the RF linear amplifier according to the envelope of the RF signal to be amplified, i.e., the bandwidth of the tracking power supply must be higher than the envelope of the output signal only [134] (interestingly, the envelope-tracking power supply proposed there is a parallel A/D hybrid configuration, achieving a maximum output frequency of 300 kHz at 50 W and 26 V).…”

Section: ) Parallel 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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Section: ) Parallel Configurationmentioning

confidence: 99%