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学者姓名：王发强
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Abstract ：
As non-isolated step-up and step-down DC-DC converters are at present widely used in various fields, this review will summarize and introduce non-isolated step-up and step-down DC-DC converters in various aspects. First of all, the origin and development of power electronics technology and the generation and principle of certain basic non-isolated step-up and step-down DC-DC converters are briefly stated. Subsequently, according to their different characteristics, including whether they are unidirectional or bidirectional, voltage-fed or current-fed, or hard-switching or soft-switching, the review will classify them and analyze their advantages and disadvantages. Meanwhile, in order to change the voltage gains of the DC-DC converters, different voltage change techniques are applied to them. The review will elaborate on the four technologies (switched capacitors, voltage multipliers, switched inductors and different ways of connecting), providing examples and analyzing the topologies in which they are applied, before summarizing the advantages and disadvantages of these techniques. Finally, this review will describe the specific applications of non-isolated step-up and step-down DC-DC converters and the reasons behind their ubiquity and popularity. Although the performances of current DC-DC converter topologies are good, there continues to be increasing demand, an updating of the topology structure, and improvements in terms of their performance. In the future, DC-DC converters will play a more important role in industrial production and people's lives.
Keyword ：
DC-DC converter topologies non-isolated step-up and step-down DC-DC converters specific applications switched capacitor switched inductor various fields voltage gains voltage multiplier
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| GB/T 7714 | Yi, Feilong , Wang, Faqiang . Review of Voltage-Bucking/Boosting Techniques, Topologies, and Applications [J]. | ENERGIES , 2023 , 16 (2) . |
| MLA | Yi, Feilong 等. "Review of Voltage-Bucking/Boosting Techniques, Topologies, and Applications" . | ENERGIES 16 . 2 (2023) . |
| APA | Yi, Feilong , Wang, Faqiang . Review of Voltage-Bucking/Boosting Techniques, Topologies, and Applications . | ENERGIES , 2023 , 16 (2) . |
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Abstract ：
In this article, the slow-scale instability occurring in the three-level T-type inverter with a passive memristive (3LT(2)IPM) load is investigated. The average model of the 3LT(2)IPM, whose coefficient matrix is nonlinear periodic time-varying, is constructed, both harmonic balance method used to calculate the approximate solution of the average model and Floquet theory used to identify the circuit dynamic states are applied to explore the mechanism of the slow-scale instability emerging in the 3LT(2)IPM. Theoretical results indicate that the slow-scale instability of the 3LT(2)IPM is caused by Hopf bifurcation emerging in a region where the frequency is higher than line frequency but much lower than switching frequency. Also, the conditions of three theoretical parameters that make the theoretical analysis results as accurate as possible are presented. Different parameters impact on the stability boundary of the 3LT(2)IPM in various design parameter spaces are discussed, and the Floquet multiplier sensitivity is analyzed to identify key parameters for the stability of the 3LT(2)IPM, which are helpful to guide parameter adjustment of the 3LT(2)IPM to ensure its stable operation in practice. Finally, hardware experiment is established and experimental verification is provided. Physical experiments agree well with simulations, which together demonstrate the correctness of theoretical analysis.
Keyword ：
Bifurcation Hopf bifurcation Inverters Memristors passive memristive load Power harmonic filters Power supplies slow-scale instability Switches three-level t-type inverter Voltage control
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| GB/T 7714 | Cao, Hongbo , Wang, Faqiang . Slow-Scale Bifurcation in Three-Level T-Type Inverter With Passive Memristive Load [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (8) : 7963-7973 . |
| MLA | Cao, Hongbo 等. "Slow-Scale Bifurcation in Three-Level T-Type Inverter With Passive Memristive Load" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 69 . 8 (2022) : 7963-7973 . |
| APA | Cao, Hongbo , Wang, Faqiang . Slow-Scale Bifurcation in Three-Level T-Type Inverter With Passive Memristive Load . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2022 , 69 (8) , 7963-7973 . |
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Abstract ：
In this article, the fast-scale instability in the three-level T-type single-phase inverter feeding diode-bridge rectifier with inductive load (3TSI-DR) is studied. Simulations suggest that such fast-scale instability on switching period scale can increase the harmonic content in the 3TSI-DR, which seriously affects its stable operation. To reveal the mechanism of this fast-scale instability, the state equation of the 3TSI-DR is derived, and state variables are solved based on quasi-static approximation principle. From state equation, the 3TSI-DR is periodic time-varying and piecewise smooth, belonging to Filippov system. Accordingly, the discrete-time mapping model of the 3TSI-DR is established, Filippov method is used for obtaining monodromy matrix, and Floquet theory is applied to explore instability mechanism. Theoretical results indicate that the fast-scale instability of the 3TSI-DR is caused by period-doubling bifurcation. Moreover, the Floquet multiplier sensitivities of different circuit parameters are calculated to identify key parameters; via comparing theoretical analyses with simulations, the unstable angle ranges of the fast-scale instability are given, and the stability boundaries in various parameter spaces are discussed. All these can provide design-oriented information for optimizing the 3TSI-DR to avoid instability due to period-doubling bifurcation. Finally, experimental results agreeing with simulations are presented to verify the correctness of theoretical analyses.
Keyword ：
Behavioral sciences Bifurcation Diode-bridge rectifier with inductive load fast-scale instability Floquet multiplier sensitivities Integrated circuit modeling Inverters Load modeling Mathematical models period-doubling bifurcation stability boundaries three-level T-type single-phase inverter Voltage
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| GB/T 7714 | Cao, Hongbo , Wang, Faqiang , Liu, Jinjun . Analysis of Fast-Scale Instability in Three-Level T-Type Single-Phase Inverter Feeding Diode-Bridge Rectifier With Inductive Load [J]. | IEEE TRANSACTIONS ON POWER ELECTRONICS , 2022 , 37 (12) : 15066-15083 . |
| MLA | Cao, Hongbo 等. "Analysis of Fast-Scale Instability in Three-Level T-Type Single-Phase Inverter Feeding Diode-Bridge Rectifier With Inductive Load" . | IEEE TRANSACTIONS ON POWER ELECTRONICS 37 . 12 (2022) : 15066-15083 . |
| APA | Cao, Hongbo , Wang, Faqiang , Liu, Jinjun . Analysis of Fast-Scale Instability in Three-Level T-Type Single-Phase Inverter Feeding Diode-Bridge Rectifier With Inductive Load . | IEEE TRANSACTIONS ON POWER ELECTRONICS , 2022 , 37 (12) , 15066-15083 . |
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Abstract ：
An inverter, whose inductor current is periodic, is the key equipment for photovoltaic power generation, fuel cell power generation, etc. A nonlinear inductor, whose inductance will be changed by its current, can be used to improve the grid current quality of the inverter, although making the mathematical model of the inverter system more complex. In this paper, the voltage-controlled full-bridge inverter with a nonlinear inductor is investigated and its mathematical model is established. The influence of parameters on the dynamical behaviors of this system is analyzed by using the harmonic balance method and the Floquet theory. Consequently, the mechanism for the occurrence of medium-frequency oscillation is revealed. The hardware circuit for the voltage-controlled full-bridge inverter with a nonlinear inductor is designed and some experimental results are presented for confirmation. The research results show that the mechanism for the occurrence of medium-frequency oscillation is Hopf bifurcation and its oscillation frequency is between the line frequency and the switching frequency.
Keyword ：
full-bridge inverter Hopf bifurcation mathematical model medium-frequency oscillation
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| GB/T 7714 | Wang, Faqiang , Zhou, Hongwei , Zhang, Jiansong et al. Medium-Frequency Oscillation in Voltage-Controlled Full-Bridge Inverter with a Nonlinear Inductor [J]. | ENERGIES , 2021 , 14 (13) . |
| MLA | Wang, Faqiang et al. "Medium-Frequency Oscillation in Voltage-Controlled Full-Bridge Inverter with a Nonlinear Inductor" . | ENERGIES 14 . 13 (2021) . |
| APA | Wang, Faqiang , Zhou, Hongwei , Zhang, Jiansong , Cao, Hongbo . Medium-Frequency Oscillation in Voltage-Controlled Full-Bridge Inverter with a Nonlinear Inductor . | ENERGIES , 2021 , 14 (13) . |
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Abstract ：
Based on the step function and signum function, a chaotic system which can generate multiscroll chaotic attractors with arrangement of saddle-shapes is proposed and the stability of its equilibrium points is analyzed. The under mechanism for the generation of multiscroll chaotic attractors and the reason for the arrangement of saddle shapes and being symmetric about y-axis are presented, and the rule for controlling the number of scroll chaotic attractors with saddle shapes is designed. Based on the core chips including Altera Cyclone IV EP4CE10F17C8 Field Programmable Gate Array and Digital to Analog Converter chip AD9767, the peripheral circuit and the Verilog Hardware Description Language program for realization of the proposed multiscroll chaotic system is constructed and some experimental results are presented for confirmation. The research result shows that the occupation of multipliers and Phase-Locked Loops in Field Programmable Gate Array is zero. © 2020 Faqiang Wang and Yufang Xiao.
Keyword ：
Chaotic systems Computer hardware description languages Digital to analog conversion Field programmable gate arrays (FPGA) Logic gates
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| GB/T 7714 | Wang, Faqiang , Xiao, Yufang . A Multiscroll Chaotic Attractors with Arrangement of Saddle-Shapes and Its Field Programmable Gate Array (FPGA) Implementation [J]. | Complexity , 2020 , 2020 . |
| MLA | Wang, Faqiang et al. "A Multiscroll Chaotic Attractors with Arrangement of Saddle-Shapes and Its Field Programmable Gate Array (FPGA) Implementation" . | Complexity 2020 (2020) . |
| APA | Wang, Faqiang , Xiao, Yufang . A Multiscroll Chaotic Attractors with Arrangement of Saddle-Shapes and Its Field Programmable Gate Array (FPGA) Implementation . | Complexity , 2020 , 2020 . |
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Abstract ：
The self-excited attractors and hidden attractors in a memcapacitive system which has three elements are studied in this paper. The critical parameter of stable and unstable states is calculated by identifying the eigenvalues of Jacobian matrix. Besides, complex dynamical behaviors are investigated in the system, such as coexisting attractors, hidden attractors, coexisting bifurcation modes, intermittent chaos, and multistability. From the theoretical analyses and numerical simulations, it is found that there are four different kinds of transient transition behaviors in the memcapacitive system. Finally, field programmable gate array (FPGA) is used to implement the proposed chaotic system. © 2020 Chinese Physical Society and IOP Publishing Ltd.
Keyword ：
Chaotic systems Eigenvalues and eigenfunctions Field programmable gate arrays (FPGA) Jacobian matrices
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| GB/T 7714 | Wang, Fu-Ping , Wang, Fa-Qiang . Multistability and coexisting transient chaos in a simple memcapacitive system [J]. | Chinese Physics B , 2020 , 29 (5) . |
| MLA | Wang, Fu-Ping et al. "Multistability and coexisting transient chaos in a simple memcapacitive system" . | Chinese Physics B 29 . 5 (2020) . |
| APA | Wang, Fu-Ping , Wang, Fa-Qiang . Multistability and coexisting transient chaos in a simple memcapacitive system . | Chinese Physics B , 2020 , 29 (5) . |
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Abstract ：
In the past, the memristor model and its application research have mainly focused on constructing and analyzing the memristor model and its equivalent circuit model based on the basic concept of memristor, while the research based on commercial memristive devices in the market has been rare. According to the theoretical relationship between meminductor and memristor, a new model of meminductor is constructed based on Knowm memristor, the first commercial memristor chip in the world, combined with the second-generation current conveyor and transconductance operational amplifier. By adjusting the frequency and the amplitude of the input voltage and the transconductance gain of the transconductance operational amplifier, the continuous adjustment of the meminductance can be effectively achieved in the circuit. The LTspice circuit model and hardware experimental circuit of the proposed meminductor are designed. The validity of the new meminductor model and the correctness of the design method are verified by LTspice simulations and circuit experiments.
Keyword ：
Knowm memristor meminductor transconductance
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| GB/T 7714 | Zhu Lei-Jie , Wang Fa-Qiang . Design and analysis of new meminductor model based on Knowm memristor [J]. | ACTA PHYSICA SINICA , 2019 , 68 (19) . |
| MLA | Zhu Lei-Jie et al. "Design and analysis of new meminductor model based on Knowm memristor" . | ACTA PHYSICA SINICA 68 . 19 (2019) . |
| APA | Zhu Lei-Jie , Wang Fa-Qiang . Design and analysis of new meminductor model based on Knowm memristor . | ACTA PHYSICA SINICA , 2019 , 68 (19) . |
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Abstract ：
In this study, a new current-controlled memristor is proposed and its characteristics are analyzed. Based on this new memristor, a new four-dimensional chaotic circuit is proposed. The complex dynamics of the proposed chaotic circuit are investigated. From the results of the theoretical analysis and the numerical simulations, it is found that the memristor-based chaotic circuit can generate different types of attractors including single-scroll, double-scroll, and periodic attractors for varying circuit parameters. By taking symmetrical initial conditions, symmetric steady coexisting attractors are obtained under the same set of circuit parameters. For certain initial conditions, striking transient coexisting attractors with different timescales can be obtained. In particular, there are two transient changes occurring successively at different time scales respect to the same initial conditions for the proposed chaotic circuit, which is a novel dynamic property. Finally, a practical circuit platform that describes the proposed chaotic circuit on Field Programmable Gate Arrays (FPGA) is designed, and some experimental results are presented for confirmation. (C) 2019 Elsevier GmbH. All rights reserved.
Keyword ：
Chaotic circuit FPGA Memristor-based Steady coexisting attractors Transient coexisting attractors
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| GB/T 7714 | Cao, Hongbo , Wang, Faqiang . Transient and steady coexisting attractors in a new memristor-based 4-D chaotic circuit [J]. | AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS , 2019 , 108 : 262-274 . |
| MLA | Cao, Hongbo et al. "Transient and steady coexisting attractors in a new memristor-based 4-D chaotic circuit" . | AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 108 (2019) : 262-274 . |
| APA | Cao, Hongbo , Wang, Faqiang . Transient and steady coexisting attractors in a new memristor-based 4-D chaotic circuit . | AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS , 2019 , 108 , 262-274 . |
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Abstract ：
This brief introduces a novel multi-shape chaotic system which can generate a 2n+2-scroll chaotic attractor in y-x plane, a 2n+2-star chaotic attractor in z-y plane, a 2n+2flower chaotic attractor in z-x plane and a 2n+2-multiple layer spiral chaotic attractor in z-w plane with the natural number n. Various chaotic attractors are illustrated not only by computer simulation but also by FPGA implementation. This novel multishape chaotic system is suitable for the potential application of secure communication.
Keyword ：
FPGA multi-flower chaotic attractor multi-layer spiral chaotic attractor Multi-scroll chaotic attractor multi-star chaotic attractor
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| GB/T 7714 | Wang, Faqiang , Wang, Riming , Iu, Herbert H. C. et al. A Novel Multi-Shape Chaotic Attractor and Its FPGA Implementation [J]. | IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS , 2019 , 66 (12) : 2062-2066 . |
| MLA | Wang, Faqiang et al. "A Novel Multi-Shape Chaotic Attractor and Its FPGA Implementation" . | IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 66 . 12 (2019) : 2062-2066 . |
| APA | Wang, Faqiang , Wang, Riming , Iu, Herbert H. C. , Liu, Chongxin , Fernando, Tyrone . A Novel Multi-Shape Chaotic Attractor and Its FPGA Implementation . | IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS , 2019 , 66 (12) , 2062-2066 . |
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Abstract ：
Positive Lyapunov exponent (LE) is vital to identify a dynamical system being chaotic or hyperchaotic. A simple method that the right-hand side of differential equations which can be used to describe the chaotic system, is multiplied by a constant value, is proposed. From the proposed method, it can not only enlarge the positive LE of chaotic or hyperchaotic systems, but also accelerate their calculation speed. Sprott C chaotic system is selected as an example to show its effectiveness. Finally, an electronic circuit model for Sprott C chaotic system is designed and some experimental results are presented for confirmation.
Keyword ：
accelerating calculation speed chaos chaotic system chaotic systems differential equations dynamical system hyperchaotic systems Lyapunov methods nonlinear control systems positive Lyapunov exponent Sprott C chaotic system
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| GB/T 7714 | Wang, Faqiang . Simple method for enlarging positive LE and accelerating calculation speed of chaotic system [J]. | ELECTRONICS LETTERS , 2019 , 55 (16) : 884-886 . |
| MLA | Wang, Faqiang . "Simple method for enlarging positive LE and accelerating calculation speed of chaotic system" . | ELECTRONICS LETTERS 55 . 16 (2019) : 884-886 . |
| APA | Wang, Faqiang . Simple method for enlarging positive LE and accelerating calculation speed of chaotic system . | ELECTRONICS LETTERS , 2019 , 55 (16) , 884-886 . |
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