Parallel Fixed Switching Frequency CRM and DCM Boost PFC Converter With High Power Factor

Yao, Kai; Li, Jiazhen; Shao, Fanguang; Zhang, Bo

doi:10.1109/tpel.2021.3118110

Cited by 20 publications

(8 citation statements)

References 30 publications

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“…Conventional ac-dc converters are intended to act as rectifiers with a unity power factor. For example, boosttype converters that follow the passive diode bridge rectifiers are used for the power factor correction for lighting loads [66]- [72], home appliances [73]- [74], and other devices [75]- [76]. However, additional features are necessary in dc microgrids, as was discussed in Section II.…”

Section: Isolated Ac-dc Power Conversion: Overview Of Topologies and ...mentioning

confidence: 99%

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Carvalho

Blinov

Chub

et al. 2022

IEEE Open J. Power Electron.

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Residential dc microgrids and nanogrids are the emerging technology that is aimed to promote the transition to energy-efficient buildings and provide simple, highly flexible integration of renewables, storages, and loads. At the same time, the mass acceptance of dc buildings is slowed down by the relative immaturity of the dc technology, lack of standardization and general awareness about its potential. Additional efforts from multiple directions are necessary to promote this technology and increase its market attractiveness. In the near-term, it is highly likely that the dc buildings will be connected to the conventional ac distribution grid by a front-end ac-dc converter that provides all the necessary protection and desired functionality. At the same time, the corresponding requirements for this converter have not been yet consolidated. To address this, present paper focuses on various aspects of the integration of dc buildings and includes analysis of related standards, directives, operational and compatibility requirements as well as classification of voltage levels. In addition, power converter configurations and modulation methods are analyzed and compared. A classification of topologies that can provide the required functionality for the This article has been accepted for publication in IEEE Open Journal of Power Electronics.

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Section: Isolated Ac-dc Power Conversion: Overview Of Topologies and ...mentioning

confidence: 99%

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Carvalho

Blinov

Chub

et al. 2022

IEEE Open J. Power Electron.

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“…Zhao et al 31 conducted experiments on coal-rock formations and analyzed the precursory information of their sudden instability. Yao et al 32 – 34 used PFC software to analyze the failure modes and influencing factors of coal-rock interactions and proposed corresponding damage, constitutive models. Huang et al 35 and Chen et al 36 studied the influence of loading rate and coal-rock height ratio on the mechanical properties of coal-rock composite specimens and obtained fracture criteria for three-dimensional interface cracks.…”

Section: Introductionmentioning

confidence: 99%

The failure behavior of coal-rock combined body under compression-shear loading

Li,

Yuan

et al. 2024

Science Progress

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As shallow coal reserves continue to deplete rapidly, deep mining has become an unavoidable course of action. In the process of deep coal mining, affected by blasting, mining, and excavation, the coal-rock interface often encounters the action of compression-shear composite load. The interface crack directly affects the stability of the coal-rock structure. Uniaxial compression experiments have been conducted on rock and coal-like material with pre-existing interfacial oblique cracks to study the crack propagation criterion of the rock and coal-like material interface. An image acquisition system is used to record the surface speckle field of the whole process of specimen failure. The strain fields and stress intensity factor of the sample at different times are obtained by digital image correlation. At the same time, the stress field near the crack tip is calculated. The results show that with the increase of loading, two strains of localization bands are formed on the surface of the specimen. One of the strain-localized bands starts at the lower tip of the prefabricated crack and propagates along the vertical interface. The other starts at the upper tip of the prefabricated damage and propagates along the interface direction. It can be seen that the lower tip of the prefabricated crack enters into the crack fracture process zone earlier than the upper tip. The strain localization band narrows gradually with the load increase, and then macro cracks appear. The initiation of two tips is suitable for different fracture criteria. The lower tip is dominated by the maximum circumferential tensile stress, and the upper tip is dominated by shear stress. The specimens eventually fracture along the interface. The evolution of the strain field during the failure process of rock and coal-like material can reflect the generation and propagation of the crack.

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“…The increasing popularity and widespread use of various power electronic devices in power grids has resulted in more and more serious harmonic pollution, so power factor correction (PFC) converters have become particularly essential in the AC-DC conversion [1][2][3][4][5]. Among the commonly used PFC converters, the Boost PFC converter has the advantages of high power factor (PF) and small total harmonic distortion (THD) [2][3][4][5]. However, the Boost converter can only operate when the output voltage is higher than the input voltage, so it is hard to be used in the applications requiring low output voltage.…”

Section: Introductionmentioning

confidence: 99%

Cuk PFC Converter Based on Variable Inductor

et al. 2023

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When the input inductor operates in discontinuous current mode (DCM), the Cuk converter can automatically achieve power factor correction (PFC) function with only a simple voltage mode control loop. However, the conventional Cuk PFC converter suffers from high intermediate capacitor voltage because of the lack of feedback of the intermediate capacitor voltage and relatively low power factor (PF). In this paper, a Cuk PFC converter using variable inductor which varies with the transient rectified input voltage is proposed to enhance the PF and reduce the intermediate capacitor voltage by injecting a controlled DC bias current into the auxiliary winding of the variable input inductor. The operating principles of the proposed Cuk PFC converter based on variable inductor are analyzed in detail, and the analysis of PF, the voltage of intermediate capacitor, and design considerations are provided. To verify the feasibility of the proposed scheme and compare the characteristics of both the traditional and proposed Cuk PFC converter, a 108W experimental prototype of the proposed converter is built and tested. The experimental results show that the proposed Cuk PFC converter can significantly enhance the PF, decrease the intermediate capacitor voltage, and increase efficiency compared with the traditional Cuk PFC converter.

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Parallel Fixed Switching Frequency CRM and DCM Boost PFC Converter With High Power Factor

Cited by 20 publications

References 30 publications

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

Grid Integration of DC Buildings: Standards, Requirements and Power Converter Topologies

The failure behavior of coal-rock combined body under compression-shear loading

Cuk PFC Converter Based on Variable Inductor

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