EPE Association: EPE 2017 - DS1e: Hard & Soft Switching techniques II

EPE 2017 - DS1e: Hard & Soft Switching techniques II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 02: Power Converter Topologies and Design > EPE 2017 - DS1e: Hard & Soft Switching techniques II

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   An Investigation into a Slight-Variation of the Transformer Effective Permeability in LLC Resonant Converter
By Mostafa NOAH [View]
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Abstract: In the LLC resonant converter, the transformer core is usually gapped to realize the designed value of magnetizing inductance that allows for soft switching. The air gap length which is in a scale of millimeters may be affected by the humidity and long working hours of the ferrite material, resulting into a variation of the core permeability. Moreover, a slight variation of the transformer core permeability may be encountered with any possible change in the core temperature. In a proper transformer design, the transformer shall operate with an optimum value of effective permeability where the sum of both copper and core losses is minimal. In this paper, the transformer optimal design is presented. Moreover, the influence of the permeability on the transformer's copper and core losses is revealed. Furthermore, with the help of newly derived equations, the effect of the transformer's effective permeability on the LLC converter conduction turn-on and turn-off losses is reported. Along with the theoretical discussion, the analysis is supported with simulation and experimental results utilizing a 250W - 200kHz prototype.

   Compact pulsed power supply based on Tesla transformer for plasma reactors
By Michal BALCERAK [View]
[Download]

Abstract: The paper describes a compact high-voltage pulse generator for supplying the non-thermal plasmareactors for sterilizing powdered spices. Built and investigated converter generates a high voltagepulses of 35kV in amplitude and 70kW in a peak. The first part of the article presents an analyticaldescription of Tesla transformer. Next part describes topology based on Tesla transformer with atoroidal magnetic core. Last part concern experimental results with a PCD and DBD reactors as a loadand its discussion.

   DC-DC power converter with Gallium Nitride Gate Injection Transistors
By Leszek WYDZGOWSKI [View]
[Download]

Abstract: In this paper, DC-DC power converter based on Galium Nitride Gate Injection Transistors (GaN GIT)is presented. The use of such power devices allows to increase of switching frequency and to reachhigh efficiency. Efficiency measurements of power conversion were carried out for two switchingfrequencies (100 kHz, 200 kHz, 400 kHz).

   Design and construction of a DAB using SiC MOSFETs with an isolation of 24 kV for PET applications
By Mariam SAEED HAZKIAL GERGES [View]
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Abstract: This paper analyzes the design and construction of a SiC-based Dual Active Bridge (DAB) converterfor its use in a three-stage Power Electronic Transformer (PET) based on a Modular MultilevelConverter (MMC). The galvanic isolation between primary and secondary of the PET provided by theDAB High Frequency Transformer (HFT) is 24 kV. Challenges for the HFT design are discussed. A 5kW DAB prototype using commercial 1.2-kV SiC MOSFETs is built to confirm the correctness of thedesign process. Parallelization of the DAB HFT to increase the power being transferred is also discussed.

   Snubber circuits for an Auxiliary resonant Commutated Pole Converter with Auxiliary Thyristors
By Matthijs HEUVELMANS [View]
[Download]

Abstract: In this work, four different snubber solutions for an Auxiliary Resonant Commutated Pole (ARCP) con-verter with an auxiliary thyristor are evaluated. The first two solutions are an RC snubber and a variationthereoff where the RC snubber losses are reduced by employing diodes for limiting the voltage over-shoot. Two other concepts are a novel lossless dV/dt clamp snubber circuit and a low-loss RC snubbercircuit, which has good fault tolerance and improved efficiency. This solution is implemented using SiCMerged P-i-N Schottky (MPS) diodes, which enables a cost-effective implementation with a high surgecurrent capability on a small total chip area. Measurement results confirm that the snubbers limit thevoltage overshoot and that the efficiency of the proposed low-loss RC snubber circuit is a substantialimprovement over a conventional RC snubber.

   Soft Switching Loss Measurements of a 1.2 kV SiC MOSFET Module by both Electrical and Calorimetric Methods for High Frequency Applications
By Subhadra TIWARI [View]
[Download]

Abstract: This paper investigates the soft switching performance of a 1.2 kV half-bridge SiC MOSFET module,FCA150XB120 from Sanrex. The selected module has both MOSFET and diode integrated on a singlechip. A single pulse control circuit is employed in a half-bridge series resonant inverter topology witha split dc-link and an LC load in order to emulate a real inverter operation. This results in a squarewave output voltage and a sine wave output current where the switching is performed before the zerocrossing of current (an inductive mode). In addition, a calorimetric loss measurement is carried outin a 78 kW full-bridge resonant inverter switching at about 200 kHz yielding an efficiency of 99 \%.Moreover, this paper aims to find the highest possible switching frequency achievable with the selectedmodule. Besides, the electrically measured loss is compared with the calorimetrically measured loss andthe possible reasons for discrepancies are discussed.

EPE 2017 - DS1e: Hard & Soft Switching techniques II
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 02: Power Converter Topologies and Design > EPE 2017 - DS1e: Hard & Soft Switching techniques II
	[return to parent folder]

	An Investigation into a Slight-Variation of the Transformer Effective Permeability in LLC Resonant Converter By Mostafa NOAH	[View] [Download]
Abstract: In the LLC resonant converter, the transformer core is usually gapped to realize the designed value of magnetizing inductance that allows for soft switching. The air gap length which is in a scale of millimeters may be affected by the humidity and long working hours of the ferrite material, resulting into a variation of the core permeability. Moreover, a slight variation of the transformer core permeability may be encountered with any possible change in the core temperature. In a proper transformer design, the transformer shall operate with an optimum value of effective permeability where the sum of both copper and core losses is minimal. In this paper, the transformer optimal design is presented. Moreover, the influence of the permeability on the transformer's copper and core losses is revealed. Furthermore, with the help of newly derived equations, the effect of the transformer's effective permeability on the LLC converter conduction turn-on and turn-off losses is reported. Along with the theoretical discussion, the analysis is supported with simulation and experimental results utilizing a 250W - 200kHz prototype.

	Compact pulsed power supply based on Tesla transformer for plasma reactors By Michal BALCERAK	[View] [Download]
Abstract: The paper describes a compact high-voltage pulse generator for supplying the non-thermal plasmareactors for sterilizing powdered spices. Built and investigated converter generates a high voltagepulses of 35kV in amplitude and 70kW in a peak. The first part of the article presents an analyticaldescription of Tesla transformer. Next part describes topology based on Tesla transformer with atoroidal magnetic core. Last part concern experimental results with a PCD and DBD reactors as a loadand its discussion.

	DC-DC power converter with Gallium Nitride Gate Injection Transistors By Leszek WYDZGOWSKI	[View] [Download]
Abstract: In this paper, DC-DC power converter based on Galium Nitride Gate Injection Transistors (GaN GIT)is presented. The use of such power devices allows to increase of switching frequency and to reachhigh efficiency. Efficiency measurements of power conversion were carried out for two switchingfrequencies (100 kHz, 200 kHz, 400 kHz).

	Design and construction of a DAB using SiC MOSFETs with an isolation of 24 kV for PET applications By Mariam SAEED HAZKIAL GERGES	[View] [Download]
Abstract: This paper analyzes the design and construction of a SiC-based Dual Active Bridge (DAB) converterfor its use in a three-stage Power Electronic Transformer (PET) based on a Modular MultilevelConverter (MMC). The galvanic isolation between primary and secondary of the PET provided by theDAB High Frequency Transformer (HFT) is 24 kV. Challenges for the HFT design are discussed. A 5kW DAB prototype using commercial 1.2-kV SiC MOSFETs is built to confirm the correctness of thedesign process. Parallelization of the DAB HFT to increase the power being transferred is also discussed.

	Snubber circuits for an Auxiliary resonant Commutated Pole Converter with Auxiliary Thyristors By Matthijs HEUVELMANS	[View] [Download]
Abstract: In this work, four different snubber solutions for an Auxiliary Resonant Commutated Pole (ARCP) con-verter with an auxiliary thyristor are evaluated. The first two solutions are an RC snubber and a variationthereoff where the RC snubber losses are reduced by employing diodes for limiting the voltage over-shoot. Two other concepts are a novel lossless dV/dt clamp snubber circuit and a low-loss RC snubbercircuit, which has good fault tolerance and improved efficiency. This solution is implemented using SiCMerged P-i-N Schottky (MPS) diodes, which enables a cost-effective implementation with a high surgecurrent capability on a small total chip area. Measurement results confirm that the snubbers limit thevoltage overshoot and that the efficiency of the proposed low-loss RC snubber circuit is a substantialimprovement over a conventional RC snubber.

	Soft Switching Loss Measurements of a 1.2 kV SiC MOSFET Module by both Electrical and Calorimetric Methods for High Frequency Applications By Subhadra TIWARI	[View] [Download]
Abstract: This paper investigates the soft switching performance of a 1.2 kV half-bridge SiC MOSFET module,FCA150XB120 from Sanrex. The selected module has both MOSFET and diode integrated on a singlechip. A single pulse control circuit is employed in a half-bridge series resonant inverter topology witha split dc-link and an LC load in order to emulate a real inverter operation. This results in a squarewave output voltage and a sine wave output current where the switching is performed before the zerocrossing of current (an inductive mode). In addition, a calorimetric loss measurement is carried outin a 78 kW full-bridge resonant inverter switching at about 200 kHz yielding an efficiency of 99 \%.Moreover, this paper aims to find the highest possible switching frequency achievable with the selectedmodule. Besides, the electrically measured loss is compared with the calorimetrically measured loss andthe possible reasons for discrepancies are discussed.