EPE Association: EPE 2019 - LS4d: Power Supplies

EPE 2019 - LS4d: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 07: Power Supplies > EPE 2019 - LS4d: Power Supplies

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   Improved Hold-Up Time for WBG-based Single-Phase Converters
By Rajesh RAJAMONY [View]
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Abstract: Hold-up time is required for the safe and uninterrupted operation of the power converters. This prevents unwanted resetting of the systems. In this paper, the hold-up time for a single-phase converter with siginificantly-reduced DC capacitors is investigated. The required dc-link and auxiliary capacitors are selected to ensure a certain period of hold-up time after the input supply fails. To maximize the utilization of dc-link voltage, this paper presents a simplified neutral leg control strategy and it has been ensured the converter control under hold-up operations. A trade-off design strategy is presented and the outcome has been compared with the solution without the auxiliary capacitor. Simulation studies were carried out to verify the hold-up time performance of the converters.

   Multiphysics Optimization of Air-Cooled PFC Rectifiers with Wide Bandgap Devices
By Silvia ZULK [View]
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Abstract: This work presents a multiphysics optimization method to identify an optimized design for single-phase, air-cooled PFC rectifiers applying wide bandgap devices. The method includes analytical models for thermal behavior, semiconductor losses, filter, and passive components. Combining all models, a minimized volume is found by choosing an optimized switching frequency and current ripple. Unlike the state of art research, semiconductor losses and the size of cooling system is considered in the optimization. An experimental evaluation confirms the validity of the presented method, stating maximum power densities of approximately 11.5 kWdm³/.

   On-line Assessment of Voltage Quality in Multi-Mode Operation of Double-conversion UPS
By Lorenzo GIUNTINI [View]
[Download]

Abstract: Double-conversion is the preferred UPS topology for protecting sensitive loads. Multi-mode UPS (maximizing efficiency while preserving power quality) are an established alternative, requiring assessment of voltage quality and particularly voltage distortion. This paper proposes a technique for estimating distortion and detecting events compromising voltage quality. The theoretical analysis is complemented by simulation and experimental result from high-power Multi-mode UPS systems.

   Three-Level DC-DC Converter using eGaN FETs for Wide Bandwidth Envelope Tracking Applications with Extended Output Voltage Range
By Srikanth YERRA [View]
[Download]

Abstract: Envelope tracking power supplies increase the efficiency of Radio Frequency Power Amplifiers incommunication base stations and mobile handsets. This paper investigates the use of a three-level DC-DC converter topology for envelope tracking applications with increased Peak to Average Power Ratios, wider bandwidths, higher voltages, and widely-varying, dynamic output signals. The selected converter topology provides reductions in voltage stress, switching loss, voltage ripple, filter size, and device-level switching frequency. EPC8004 enhancement mode Gallium Nitride field effect transistors demonstrate total effective switching frequencies up to 40 MHz. A fourth-order low pass filter isdesigned to track an envelope signal with 8 MHz bandwidth. SPICE simulation results and experimental results are included.

EPE 2019 - LS4d: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 07: Power Supplies > EPE 2019 - LS4d: Power Supplies
	[return to parent folder]

	Improved Hold-Up Time for WBG-based Single-Phase Converters By Rajesh RAJAMONY	[View] [Download]
Abstract: Hold-up time is required for the safe and uninterrupted operation of the power converters. This prevents unwanted resetting of the systems. In this paper, the hold-up time for a single-phase converter with siginificantly-reduced DC capacitors is investigated. The required dc-link and auxiliary capacitors are selected to ensure a certain period of hold-up time after the input supply fails. To maximize the utilization of dc-link voltage, this paper presents a simplified neutral leg control strategy and it has been ensured the converter control under hold-up operations. A trade-off design strategy is presented and the outcome has been compared with the solution without the auxiliary capacitor. Simulation studies were carried out to verify the hold-up time performance of the converters.

	Multiphysics Optimization of Air-Cooled PFC Rectifiers with Wide Bandgap Devices By Silvia ZULK	[View] [Download]
Abstract: This work presents a multiphysics optimization method to identify an optimized design for single-phase, air-cooled PFC rectifiers applying wide bandgap devices. The method includes analytical models for thermal behavior, semiconductor losses, filter, and passive components. Combining all models, a minimized volume is found by choosing an optimized switching frequency and current ripple. Unlike the state of art research, semiconductor losses and the size of cooling system is considered in the optimization. An experimental evaluation confirms the validity of the presented method, stating maximum power densities of approximately 11.5 kWdm³/.

	On-line Assessment of Voltage Quality in Multi-Mode Operation of Double-conversion UPS By Lorenzo GIUNTINI	[View] [Download]
Abstract: Double-conversion is the preferred UPS topology for protecting sensitive loads. Multi-mode UPS (maximizing efficiency while preserving power quality) are an established alternative, requiring assessment of voltage quality and particularly voltage distortion. This paper proposes a technique for estimating distortion and detecting events compromising voltage quality. The theoretical analysis is complemented by simulation and experimental result from high-power Multi-mode UPS systems.

	Three-Level DC-DC Converter using eGaN FETs for Wide Bandwidth Envelope Tracking Applications with Extended Output Voltage Range By Srikanth YERRA	[View] [Download]
Abstract: Envelope tracking power supplies increase the efficiency of Radio Frequency Power Amplifiers incommunication base stations and mobile handsets. This paper investigates the use of a three-level DC-DC converter topology for envelope tracking applications with increased Peak to Average Power Ratios, wider bandwidths, higher voltages, and widely-varying, dynamic output signals. The selected converter topology provides reductions in voltage stress, switching loss, voltage ripple, filter size, and device-level switching frequency. EPC8004 enhancement mode Gallium Nitride field effect transistors demonstrate total effective switching frequencies up to 40 MHz. A fourth-order low pass filter isdesigned to track an envelope signal with 8 MHz bandwidth. SPICE simulation results and experimental results are included.