EPE Association: EPE 2020 - DS3b-3: Converter Design and Optimization-3

EPE 2020 - DS3b-3: Converter Design and Optimization-3
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - DS3b-3: Converter Design and Optimization-3

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   An Improved Bidirectional Hybrid Switched Inductor Converter
By Dan-Cornel HULEA [View]
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Abstract: This paper proposes an improved high ratio bidirectional hybrid DC-DC converter that incorporates a switched inductor cell which helps achieve wider conversion ratios, reduced components size, and reduced semiconductor stress. The improvements for this topology, when compared to other bidirectional hybrid switched capacitor converters, consist of the elimination of inductor voltage oscillations, reduction of maximum voltage stress on transistors, minimization of parasitic switching inductances and elimination of high frequency common mode voltage. The topology is realized with two conventional half bridges, which help achieve a faster implementation, and provides the topology with the benefit of utilizing the research realized on these structures.

   Analysis of Current in Pulsating DC Link Converter with Zero Voltage Transition
By Daniele MARCIANO [View]
[Download]

Abstract: An exhaustive analysis of the evolution of current in the input power stage of insulated multistageDC/AC power converter based on the Pulsating DC link principle, characterized by Zero VoltageTransition (ZVT) of the output stage is provided in this work. This topology is featured by an inputpower stage which provides on the second stage a pulsed voltage characterized by zero phases(pulsating DC link) which are used to achieve the ZVT conditions for the commutations of this stage.The specific and innovative topology of this converter influences the evolution of the main electricalcharacteristics and requires more attention on the design. The parameters that affects the behavior ofthe current in this particular topology, especially in the crucial working phases are identified and theirinfluence are analyzed to define the constraints of this system. A complete study of the current hasbeen accomplished by Spice simulator for different combination of leakage parameters of thearchitecture and switching frequency of the two power stages. The obtained results are presented anddiscussed to provide the limits of the design of the main components that compose this particularpower converter. For the experimental validation of the results of the simulation, a 3.5kW prototype of the power converter was assembled and tested on variable load.

   Experimental validation and comparison of a SiC MOSFET based 100 kW 1.2 kV 20 kHz three-phase dual active bridge converter using two vector groups.
By Piotr DWORAKOWSKI [View]
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Abstract: The Dual Active Bridge appears as a promising DC-DC converter topology when galvanic isolation and bidirectional power flow are required. Among its advantages, Zero Voltage Switching allows the switching losses to be significantly reduced. For high power applications, the three-phase topology variant may be interesting in order to reach a higher power density, especially when a three-phase transformer is implemented instead of three single-phase transformers. Moreover, the transformer vector group offers a new degree of freedom for the designers. In this paper, the authors present the experimental validation of a 1.2 kV - 100 kW - 20 kHz three-phase Dual Active Bridge converter using two medium frequency transformers and different vector groups.

   Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters
By Xinwei XU [View]
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Abstract: This paper presents a midpoint voltage balancer (MVB) which provides neutral point voltage stabilization to three-phase four-wire converters. The MVB consists of dual switching legs, two neutral inductors, and two split capacitors. A sensorless approach with open-loop control is adopted. It removes current/voltage sensors and alleviates computational demand. It is a cost effective and robust alternative to the closed-loop MVB. Due to the zero-crossing of the neutral inductor current, all switches of the MVB operates in zero-voltage switching mode when neutral current is smaller than the nominal phase current of the three-phase four-wire converter. Interleaving operation of the MVB minimizes the high-frequency current circulation in the split capacitors. In addition, the two neutral inductors are magnetically coupled to decrease the inductor current ripple. As a result, the size of passive components of the MVB is reduced. The proposed sensorless approach is verified by a 20 kVA prototype.

EPE 2020 - DS3b-3: Converter Design and Optimization-3
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - DS3b-3: Converter Design and Optimization-3
	[return to parent folder]

	An Improved Bidirectional Hybrid Switched Inductor Converter By Dan-Cornel HULEA	[View] [Download]
Abstract: This paper proposes an improved high ratio bidirectional hybrid DC-DC converter that incorporates a switched inductor cell which helps achieve wider conversion ratios, reduced components size, and reduced semiconductor stress. The improvements for this topology, when compared to other bidirectional hybrid switched capacitor converters, consist of the elimination of inductor voltage oscillations, reduction of maximum voltage stress on transistors, minimization of parasitic switching inductances and elimination of high frequency common mode voltage. The topology is realized with two conventional half bridges, which help achieve a faster implementation, and provides the topology with the benefit of utilizing the research realized on these structures.

	Analysis of Current in Pulsating DC Link Converter with Zero Voltage Transition By Daniele MARCIANO	[View] [Download]
Abstract: An exhaustive analysis of the evolution of current in the input power stage of insulated multistageDC/AC power converter based on the Pulsating DC link principle, characterized by Zero VoltageTransition (ZVT) of the output stage is provided in this work. This topology is featured by an inputpower stage which provides on the second stage a pulsed voltage characterized by zero phases(pulsating DC link) which are used to achieve the ZVT conditions for the commutations of this stage.The specific and innovative topology of this converter influences the evolution of the main electricalcharacteristics and requires more attention on the design. The parameters that affects the behavior ofthe current in this particular topology, especially in the crucial working phases are identified and theirinfluence are analyzed to define the constraints of this system. A complete study of the current hasbeen accomplished by Spice simulator for different combination of leakage parameters of thearchitecture and switching frequency of the two power stages. The obtained results are presented anddiscussed to provide the limits of the design of the main components that compose this particularpower converter. For the experimental validation of the results of the simulation, a 3.5kW prototype of the power converter was assembled and tested on variable load.

	Experimental validation and comparison of a SiC MOSFET based 100 kW 1.2 kV 20 kHz three-phase dual active bridge converter using two vector groups. By Piotr DWORAKOWSKI	[View] [Download]
Abstract: The Dual Active Bridge appears as a promising DC-DC converter topology when galvanic isolation and bidirectional power flow are required. Among its advantages, Zero Voltage Switching allows the switching losses to be significantly reduced. For high power applications, the three-phase topology variant may be interesting in order to reach a higher power density, especially when a three-phase transformer is implemented instead of three single-phase transformers. Moreover, the transformer vector group offers a new degree of freedom for the designers. In this paper, the authors present the experimental validation of a 1.2 kV - 100 kW - 20 kHz three-phase Dual Active Bridge converter using two medium frequency transformers and different vector groups.

	Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters By Xinwei XU	[View] [Download]
Abstract: This paper presents a midpoint voltage balancer (MVB) which provides neutral point voltage stabilization to three-phase four-wire converters. The MVB consists of dual switching legs, two neutral inductors, and two split capacitors. A sensorless approach with open-loop control is adopted. It removes current/voltage sensors and alleviates computational demand. It is a cost effective and robust alternative to the closed-loop MVB. Due to the zero-crossing of the neutral inductor current, all switches of the MVB operates in zero-voltage switching mode when neutral current is smaller than the nominal phase current of the three-phase four-wire converter. Interleaving operation of the MVB minimizes the high-frequency current circulation in the split capacitors. In addition, the two neutral inductors are magnetically coupled to decrease the inductor current ripple. As a result, the size of passive components of the MVB is reduced. The proposed sensorless approach is verified by a 20 kVA prototype.