Power Electronics Inverter with a Modified Sigma-Delta Modulator and an Output Stage Based on GaN E-HEMTs

Gwóźdź, Michał; Matecki, Dominik

doi:10.1007/978-3-319-45735-2_13

Cited by 3 publications

(10 citation statements)

References 5 publications

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“…The DHCSDM principles of operation was dedicated the work [7]. Therefore, only a brief detail of the DHCSDM is given here for reader's convenience.…”

Section: Basics Of Converter's Operationmentioning

confidence: 99%

“…By means of heuristic methods following equation has been formulated [7]. This one specifies the value of the PWM "carrier" frequency of SDM output signal (however, the equation is valid for small values of the modulation index only) If I  (Fig.…”

Section: Basics Of Converter's Operationmentioning

confidence: 99%

“…This one specifies the value of the PWM "carrier" frequency of SDM output signal (however, the equation is valid for small values of the modulation index only) If I  (Fig. 1) in relation to C  is too small the system stability can be an issue [2,7]. For obtaining of this the following equation has to be met…”

Section: Basics Of Converter's Operationmentioning

confidence: 99%

“…By fulfilling (3) the integrator is also prevented from entering its output in a signal clipping state [7].…”

Section: Basics Of Converter's Operationmentioning

confidence: 99%

“…As result, the value of distortions of the inverter output voltage are lower, compared to a typical, i.e. digital PWM based, solutions [6,7]. This benefit is not paid significantly by increase in the system complexity.…”

Section: Introductionmentioning

confidence: 99%

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Broadband power electronics controlled voltage source with output stage based on GaN transistors

Gwóźdź

2018

ELECTROTECHNICAL REVIEW

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The work presents the power electronics controlled voltage source (VCVS) with a modified sigma-delta modulator (SDM) in the control section. The modulator includes an analog comparator with dynamic hysteresis instead of a latched comparator, being typically used in single-bit SDMs. Thank to this feature a resolution of the SDM output signal is, theoretically, unlimited. Due to very high frequency of the SDM output bit stream in the power stage of VCVS the GaN transistors are used. Planned field of application of the converter is an Automated Test Equipment (ATE). In the work the converter's operation basics and selected results of its simulation model studies are presented. Streszczenie. W pracy zaprezentowano energoelektroniczne sterowane źródło napięcia ze zmodyfikowanym modulatorem sigma-delta w bloku sterowania. Modulator zawiera komparator z dynamiczną pętlą histerezy zamiast, typowo stosowanego, komparatora "zatrzaskowego". Dzięki temu rozdzielczość sygnału wyjściowego modulatora jest, teoretycznie, nieskończona. Z powodu znacznej wartości częstotliwości strumienia bitowego na wyjściu modulatora, w bloku wykonawczym użyto tranzystorów GaN. Planowanym polem zastosowań źródła napięcia jest sprzęt do testowania urządzeń elektrycznych dużej mocy. W pracy przedstawiono zasadę działania źródła oraz przedstawiono wybrane wyniki badań jego modelu symulacyjnego. (Szerokopasmowe energoelektroniczne sterowane źródło napięcia ze stopniem mocy bazującym na tranzystorach GaN).

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“…The DHCSDM principles of operation was dedicated the work [7]. Therefore, only a brief detail of the DHCSDM is given here for reader's convenience.…”

Section: Basics Of Converter's Operationmentioning

confidence: 99%

Section: Basics Of Converter's Operationmentioning

confidence: 99%

Section: Basics Of Converter's Operationmentioning

confidence: 99%

“…By fulfilling (3) the integrator is also prevented from entering its output in a signal clipping state [7].…”

Section: Basics Of Converter's Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Broadband power electronics controlled voltage source with output stage based on GaN transistors

Gwóźdź

2018

ELECTROTECHNICAL REVIEW

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Bulletin of the Polish Academy of Sciences: Technical Sciences

Gwóźdź

Ciepliński

2021

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This paper presents a concept of a shunt active power filter, which is able to provide more precise mapping of its input current drawn from a power line in a reference signal, as compared to a typical filter solution. It can be achieved by means of an interconnection of two separate power electronics converters making, as a whole, a controlled current source, which mainly determines the quality of the shunt active filter operation. One of these power devices, the "auxiliary converter", corrects the total output current, being a sum of output currents of both converters, toward the reference signal. The rated output power of the auxiliary converter is much lower than the output power of the main one, while its frequency response is extended. Thanks to both these properties and the operation of the auxiliary converter in a continuous mode, pulse modulation components in the filter input current are minimized. Benefits of the filter are paid for by a relatively small increase in the complexity and cost of the system. The proposed solution can be especially attractive for devices with higher output power, where, due to dynamic power loss in power switches, a pulse modulation carrier frequency must be lowered, leading to the limitation of the "frequency response" of the converter. The concept of such a system was called the "hybrid converter topology". In the first part of the paper, the rules of operation of the active filter based on this topology are presented. Also, the results of comparative studies of filter simulation models based on both typical, i.e. single converter, and hybrid converter topologies, are discussed.

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Power Electronics Programmable Voltage Source with Reduced Ripple Component of Output Signal Based on Continuous-Time Sigma-Delta Modulator

Gwóźdź¹

2021

Energies

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In this work, an idea of a wideband, precision, power electronics programmable voltage source (PVS) is presented. One of the basic elements of the converter, the control section, contains a continuous-time sigma-delta modulator (SDM) with a pair of interconnected complementary comparators, which represents a new approach. In this case, the SDM uses comparators with a dynamic hysteresis loop (DHC) that includes an AC circuit rather than an R-R network. Dynamic hysteresis is a very effective way of eliminating parasitic oscillation during the signal transition at the input of the comparator; it also affects the frequency characteristics and, especially, the phase properties of the comparator, and this phenomenon is exploited in the proposed converter. The main disadvantage of all pulse-modulated converters is the presence of a ripple component in the output voltage (current), which reduces the quality of the output signal and may cause high-frequency disturbances. A basic feature of PVS is a lower RMS value for the pulse modulation component in the output voltage of the converter, compared to the typical value. Another important feature of the proposed converter is the ability of precise mapping of the output voltage to the reference (input) signal. The structure of the control circuit is relatively simple—no complex, digital components are used. Due to the high frequency of the SDM output bit-stream, the simulation model of the power stage of PVS is based on the power modules with gallium-nitride field effect transistors (GaN FETs). The work discusses the rules of PVS operations and the results from PVS simulation model studies as well as highlights the possible application fields for systems with a PVS.

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Power Electronics Inverter with a Modified Sigma-Delta Modulator and an Output Stage Based on GaN E-HEMTs

Cited by 3 publications

References 5 publications

Broadband power electronics controlled voltage source with output stage based on GaN transistors

Broadband power electronics controlled voltage source with output stage based on GaN transistors

Bulletin of the Polish Academy of Sciences: Technical Sciences

Power Electronics Programmable Voltage Source with Reduced Ripple Component of Output Signal Based on Continuous-Time Sigma-Delta Modulator

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