Search query: two level pfc

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abstract: Finding and comparing power losses in power electronics topologies is most commonly done by using IGBT switching losses from datasheets. The method in this paper, however, is an approach using a measurement setup, of which the data are used in MATLAB Simulink in combination with Plexim PLECS. Using this method, losses are analyzed in T type, flying capacitor and diode clamped multi level PFC topologies, and compared with the losses in a two level PFC circuit. Analysis of the topologies is done for both rectifier and inverter mode, using IGBTs with Si and SiC diodes. The results show the lowest losses in rectifier mode are achieved with the T type three level topology for ail simulated switching frequencies. In inverter mode, however, the diode clamped and flying capacitor topologies perform equal, with lower losses than the T type PFC, while, for switching frequencies below 30kHz, the two level topology has the lowest losses.
author_names: Bas J D Vermulst

Jorge L Duarte
title: Losses evaluation of two level and three level PFC topologies based on semiconductor measurements
venue: 2013 IEEE ECCE Asia Downunder
year: 2013

abstract: In this paper, a comprehensive efficiency evaluation of several single phase bridgeless Power Factor Correction (PFC) boost rectifier topologies is conducted. Both two level and three level bridgeless PFC boost rectifier topologies are considered; including paralleled and interleaved variants of each. To improve efficiency, a three level bridgeless PFC boost rectifier with an AC switch is proposed. Loss analysis of the topologies are provided, which shows the advantage of three level converters and interleaved systems in achieving high efficiency.
author_names: Qiong Wang

Bo Wen

Rolando Burgos

Dushan Boroyevich

Adam M White
title: Efficiency evaluation of two level and three level bridgeless PFC boost rectifiers
venue: 2014 IEEE Applied Power Electronics Conference and Exposition APEC 2014
year: 2014

abstract: Conventional critical conduction mode (CRM) control for many boost derived power factor correction (PFC) circuits forms triangular inductor current. For three level boost (TLB) converter, the conventional method is unattractive because losses increase but waveform quality remains unchanged, compared to other topologies. In order to obtain higher efficiency and improved waveform qualities, this article focuses on the distinctive structure of TLB and its inherent degree of freedom (DOF) in current slope shaping. Based on the DOF, a new CRM control for TLB PFC is proposed and analyzed. Detailed design and digital implementation method are also provided. Different from conventional methods, the proposed CRM control divides each switching cycle into three parts including common on time of two switches, additional on time of one switch and common off time. Accordingly, TLB inductor current is synthesized in quadrangular forms. The analyses and experimental results confirm that switching frequency and peak input current of TLB can be reduced by the proposed control. Due to the reductions, efficiency, total harmonic distortion, and quality of input current are improved with practically unchanged power factor.
author_names: Moonhyun Lee

Jong-Woo Kim

Jih-Sheng Jason Lai
title: Digital Based Critical Conduction Mode Control for Three Level Boost PFC Converter
venue: IEEE Transactions on Power Electronics
year: 2020

abstract: Active pulsating power buffering (PPB) is an effective technique to reduce the energy storage requirement of a single phase power factor correction (PFC) rectifier. Existing single phase solutions with active PPB, however, generally suffer from high voltage stresses, leading to increased power losses as well as the need for high voltage rating semiconductor switches. Previous works have been focusing on two level switching converter configurations, and thus have failed to address the high voltage stress problem. In this paper, a single phase three level flying capacitor PFC rectifier with PPB embedded switching is proposed. The flying capacitor not only clamps the voltage stresses of all power devices but also functions as a PPB capacitor. The operating principles, control methods, and design guidelines are detailed and the feasibility of the proposed converter is verified through a 48 W (48 V/1 A) hardware prototype. The proposed rectifier is shown to achieve nearly 50% reduction of the voltage stresses, 72% reduction of the buffering capacitor's volume, and 23.8% reduction of the magnetic core size, as compared to a state of the art two level solution recently proposed. This new approach of formulating single phase PFC rectifiers with active PPB could dramatically boost the system's efficiency and power density whilst reducing cost.
author_names: Wenlong Qi

Sinan Li

Huawei Yuan

Siew-Chong Tan

Shu Yuen Ron Hui
title: High Power Density Single Phase Three Level Flying Capacitor Buck PFC Rectifier
venue: IEEE Transactions on Power Electronics
year: 2019

abstract: This paper introduces a flying capacitor multilevel (FCML) totem pole bridgeless power factor correction (PFC) rectifier for the high efficiency and high density switching power supplies of data centers. A 3kW four level FCML totem pole PFC with 200V GaN devices is discussed and designed in this paper. Compared with the conventional two level GaN totem pole PFC, this four level FCML GaN totem pole PFC utilizes the low voltage GaN devices, reduces the switching voltage, reduces the voltage stress on the inductor and increases the equivalent ripple frequency of the inductor. Since the reduced switching voltage also reduces the dv/dt, the EMI noises are also reduced. Based on the commercial cubic composite inductors, a modular compact and low profile inductor design method is introduced for this four level totem pole PFC. A high density 3kW four level FCML GaN totem pole PFC prototype is developed and tested. The working principles, control strategy and performance of this PFC rectifier are verified by the experimental results. The estimated peak efficiency of the prototype is 99% and the power density is about 125W/in3.
author_names: Qingyun Huang

Qingxuan Ma

Pengkun Liu

Alex Q Huang

Michael de Rooij
title: 3kW Four Level Flying Capacitor Totem Pole Bridgeless PFC Rectifier with 200V GaN Devices
venue: 2019 IEEE Energy Conversion Congress and Exposition (ECCE)
year: 2019

abstract: This paper presents a three level quasi two stage single phase power factor correction (PFC) converter that has flexible output voltage and improved conversion efficiency. The proposed PFC converter features sinusoidal input current, three level output characteristic, and a wide range of output dc voltages, and it will be very suitable for high power applications where the output voltage can be either lower or higher than the peak ac input voltage, e.g. plug in hybrid electric vehicle charging systems. Moreover, the involved dc/dc buck conversion stage may only need to process partial input power rather than full scale of the input power, and therefore the system overall efficiency can be much improved. Through proper control of the buck converter, it is also possible to mitigate the double line frequency ripple power that is inherent in a single phase ac/dc system, and the resulting load end voltage will be fairly constant. The dynamic response of this regulation loop is also very fast and the system is therefore insensitive to external disturbances. Both simulation and experimental results are presented to show the effectiveness of this converter as well as its efficiency improvement against a conventional two stage solution.
author_names: Yi Tang

Dexuan Zhu

Chi Jin

Peng Wang

Frede Blaabjerg
title: A Three Level Quasi Two Stage Single Phase PFC Converter with Flexible Output Voltage and Improved Conversion Efficiency
venue: IEEE Transactions on Power Electronics
year: 2015

abstract: In this paper, a control algorithm of a three phase three level power factor correction (PFC) rectifier, using a mathematical analysis of two level space vector modulation (SVM) is presented. The proposed control scheme was developed, in order to generate the duty cycle signals for each switching device based on the discontinuous space vector modulation (DSVM) method. For this proposal it is not essential to determine the direction of line currents and sector of vectors, only to recognize the angle of the input reference voltage. Furthermore, the number of commutations of switches and switching losses are reduced due to the DSVM method. Simulation and calculation results can confirm the feasibility of the control algorithm and performance of the proposed rectifier.
author_names: Ong-ard Tubburee

Yuttana Kumsuwan
title: Current sector control for a three phase three level PFC rectifier
venue: 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE ECCE Asia)
year: 2015

abstract: In this paper, a control algorithm of a three phase three level power factor correction (PFC) rectifier, using a mathematical analysis of continuous space vector modulation (CSVM) is presented. The proposed control scheme, in order to generate the duty cycle signals for each switching device with no need of to determine the direction of line currents and sector of vectors, only to recognize the angle of the input reference voltage, is developed. For this proposal, the operating constraints of the three phase three level rectifier with the two level space vector modulation strategy are examined carefully, and the proposed control algorithm ensures that the input line currents are in phase with the respective voltages. Simulation and calculation results can confirm the feasibility of the control algorithm and performance of the proposed rectifier.
author_names: Ong-ard Tubburee

Yuttana Kumsuwan
title: Continuous SVM strategy with current sector control concept for a three phase three level PFC rectifier
venue: 2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI CON)
year: 2015

abstract: This paper presents LCL filter design method for three phase two level power factor correction (PFC) using line impedance stabilization network (LISN) A straightforward LCL filter design along with variation in grid impedance is not simply achievable and inevitably lead to an iterative solution for filter. By introducing of fast power switches for PFC applications such as silicon carbide, major current harmonics around the switching frequency drops in the region that LISN can actively provide well defined impedance for measuring the harmonics (i.e. 9 kHz 30MHz) Therefore, LISN can be replaced with unknown grid impedance at high frequency, simplify the model of the filter, and provide repetitive measurements. In this paper, all the filter parameters are derived with analyzing the behavior of the converter at high frequency with presence of LISN impedance. The minimum required filter capacitor is derived using the current ripple behavior of converter side inductor. The grid side inductor is achieved as a function of LISN impedance to fulfill the grid regulation. To verify the analyses, an LCL filter is designed for a 5 kW SiC based PFC. The simulation and experimental results support the validity of the method.
author_names: Alireza Kouchaki

Morten Nymand
title: LCL filter design for three phase two level power factor correction using line impedance stabilization network
venue: 2016 IEEE Applied Power Electronics Conference and Exposition (APEC)
year: 2016

abstract: This paper presents a Scott transformer based three phase, two switch PFC (Power Factor Correction) boost rectifier for improving the power quality in a three level diode clamped inverter (DCI) feeding indirect rotor field oriented control (FOC) based induction motor drive (IMD) Sinusoidal unity power factor source current and dc link voltage regulation are achieved in the proposed rectifier only with two switches. The three level DCI is supplied by a split dc link obtained from a Scott connected transformer feeding a rectifier. It is shown that a three level DCI achieves reduced stator current with lower voltage harmonic content even at a lower switching frequency as compared to a two level inverter. This results in reduction of voltage stress on motor windings for the same amount of torque ripple when indirect rotor FOC algorithm is implemented for the IMD. A MATLAB based simulation model of proposed PFC rectifier is developed for validating the design and to verify that the power quality issues in three level DCI fed IMD are adequately addressed. The performance of the system is studied and compared with a conventional diode rectifier fed vector controlled IMD for different operating conditions of the drive.
author_names: Gurumoorthy Bhuvaneswari

B Singh

Sandeep Madishetti
title: Three phase, two switch PFC rectifier fed three level VSI based FOC of induction motor drive
venue: 2012 IEEE Fifth Power India Conference
year: 2012