EPE Association: EPE 2014 - LS5a: Power Factor Correction Techniques

EPE 2014 - LS5a: Power Factor Correction Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 02: Power Converter Topologies and Design > EPE 2014 - LS5a: Power Factor Correction Techniques

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   A Bridgeless PFC Converter With High Efficiency and Universal Input Voltage Range
By Liping ZHOU, Dongyuan QIU, Wenxun XIAO, Bo ZHANG [View]
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Abstract: In this paper, a bridgeless PFC converter in which two diodes in the rectifier-bridge are replaced by two switches is proposed, and its operating principles in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are analyzed in detailed. The simulation results verify the theoretical analysis. Compared to other bridgeless PFC converter, the proposed converter has lower voltage stress, higher static gain and is more suitable for the universal input voltage application.

   Energy Recovery DC/AC Converter for Piezoelectric Transformer
By Dejan VASIC, François COSTA [View]
[Download]

Abstract: Piezoelectric transformers have been used successfully in DC/AC or DC/DC converter. However, the use of piezoelectric transformers presents a major challenges for power electronic design: the capacitive nature of such devices makes their use delicate as the instantaneous power may be much greater than the average effective power. Due to this challenge, conventional drive circuits, especially inductor, become too bulky. This work describes a converter suitable to drive piezoelectric transformer with low inductor. The proposed converter is a DC/AC structure, which is capable of producing a unipolar square voltage. The circuit provides for recovery of the energy stored on the clamped capacitance back to the primary power supply when the transformer is de-energized. In our design, an auxiliary shunt circuits are connected to the input terminal. The proposed structure of both theoretical and experimental validations has demonstrated the effectiveness of the proposed technique for recovery energy.

   Flying-Capacitor Topology for Grounding of Single-Phase Transformer-less Three-Level Photovoltaic Inverters
By Olivier STALTER, Patrick WELLNITZ, Bruno BURGER [View]
[Download]

Abstract: This paper presents a new inverter topology named after its operating principle based on aflying capacitor. The inverter uses neither a grid transformer (50/60 Hz) nor a high frequency transformer and therefore does not provide a strict galvanic isolation. However, its innovative circuit hasbeen designed in order to allow grounding one pole of the photovoltaic (PV) generator which is notfeasible with common transformer-less PV inverters. The slight drop in efficiency and increase in sizeand costs due to the use of more numerous semiconductors and additional passive components is wellbelow that of inverters using high or low frequency transformers and is fully compensated by decisivetechnical advantages. Indeed, the ability to ground the DC side of the inverter can be of a great interestfor certain PV generators but also for other kinds of applications such as batteries.

   Modulation Strategy with Minimum Switching Losses for Three-Phase AC-DC Matrix Converters
By Michele MENGONI, Luca ZARRI, Angelo TANI, Giancarlo RINI, Giovanni SERRA, Domenico CASADEI [View]
[Download]

Abstract: Passive three-phase rectifier circuits are very popular for ac-dc power conversion. However, they do not have the capability to reverse the power flow, which is demanded by some recent potential smart-grid applications, such as vehicle-to-grid (V2G) power transfer.As an alternative, this paper analyzes the behavior of three-phase ac-dc matrix converters. Among the modulation strategies that minimize the switching losses, the one leading to the minimum output current ripple is chosen. The behavior of this modulation strategy is experimentally tested.

EPE 2014 - LS5a: Power Factor Correction Techniques
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 02: Power Converter Topologies and Design > EPE 2014 - LS5a: Power Factor Correction Techniques
	[return to parent folder]

	A Bridgeless PFC Converter With High Efficiency and Universal Input Voltage Range By Liping ZHOU, Dongyuan QIU, Wenxun XIAO, Bo ZHANG	[View] [Download]
Abstract: In this paper, a bridgeless PFC converter in which two diodes in the rectifier-bridge are replaced by two switches is proposed, and its operating principles in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are analyzed in detailed. The simulation results verify the theoretical analysis. Compared to other bridgeless PFC converter, the proposed converter has lower voltage stress, higher static gain and is more suitable for the universal input voltage application.

	Energy Recovery DC/AC Converter for Piezoelectric Transformer By Dejan VASIC, François COSTA	[View] [Download]
Abstract: Piezoelectric transformers have been used successfully in DC/AC or DC/DC converter. However, the use of piezoelectric transformers presents a major challenges for power electronic design: the capacitive nature of such devices makes their use delicate as the instantaneous power may be much greater than the average effective power. Due to this challenge, conventional drive circuits, especially inductor, become too bulky. This work describes a converter suitable to drive piezoelectric transformer with low inductor. The proposed converter is a DC/AC structure, which is capable of producing a unipolar square voltage. The circuit provides for recovery of the energy stored on the clamped capacitance back to the primary power supply when the transformer is de-energized. In our design, an auxiliary shunt circuits are connected to the input terminal. The proposed structure of both theoretical and experimental validations has demonstrated the effectiveness of the proposed technique for recovery energy.

	Flying-Capacitor Topology for Grounding of Single-Phase Transformer-less Three-Level Photovoltaic Inverters By Olivier STALTER, Patrick WELLNITZ, Bruno BURGER	[View] [Download]
Abstract: This paper presents a new inverter topology named after its operating principle based on aflying capacitor. The inverter uses neither a grid transformer (50/60 Hz) nor a high frequency transformer and therefore does not provide a strict galvanic isolation. However, its innovative circuit hasbeen designed in order to allow grounding one pole of the photovoltaic (PV) generator which is notfeasible with common transformer-less PV inverters. The slight drop in efficiency and increase in sizeand costs due to the use of more numerous semiconductors and additional passive components is wellbelow that of inverters using high or low frequency transformers and is fully compensated by decisivetechnical advantages. Indeed, the ability to ground the DC side of the inverter can be of a great interestfor certain PV generators but also for other kinds of applications such as batteries.

	Modulation Strategy with Minimum Switching Losses for Three-Phase AC-DC Matrix Converters By Michele MENGONI, Luca ZARRI, Angelo TANI, Giancarlo RINI, Giovanni SERRA, Domenico CASADEI	[View] [Download]
Abstract: Passive three-phase rectifier circuits are very popular for ac-dc power conversion. However, they do not have the capability to reverse the power flow, which is demanded by some recent potential smart-grid applications, such as vehicle-to-grid (V2G) power transfer.As an alternative, this paper analyzes the behavior of three-phase ac-dc matrix converters. Among the modulation strategies that minimize the switching losses, the one leading to the minimum output current ripple is chosen. The behavior of this modulation strategy is experimentally tested.