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学者姓名：张一鸣
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摘要 ：
SiC MOSFETs have an excellent characteristic of high switching speed, which can improve the efficiency and power density of converters significantly. However, the fast switching processes of SiC MOSFETs cause serious crosstalk problems in bridge-arm configurations, which restricts the devices' performances. This paper presents a detailed and accurate improved crosstalk analytical model, which takes into account the nonlinear capacitances, the parasitic inductances, the reverse recovery characteristics of the anti-parallel diodes, and the nonlinear voltage switching and damping oscillation process. The novelty of the proposed model lies in the fact that under the condition of comprehensively considering all these non-ideal factors of the bridge-arm, the effects of multi-parasitic elements and multi-variables coupling to the crosstalk are hierarchically divided. The parasitic elements and their correlations are described in detail and the direct and indirect variables' impacts are clearly traced. Thus, according to the different variables switching stages, the influence processes of these parasitic elements and variables can be integrated and a complete equivalent analytical model of the crosstalk process can be derived. The simulation and experiment platforms are established and a series of experimental verifications and comparisons prove that the model can replicate experimental measurements of crosstalk with good accuracy and detail.
关键词 ：
analytical model analytical model SiC MOSFETs SiC MOSFETs crosstalk crosstalk bridge-arm bridge-arm
引用：
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| GB/T 7714 | Yuan, Dakang , Zhang, Yiming , Wang, Xuhong . An Improved Analytical Model for Crosstalk of SiC MOSFET in a Bridge-Arm Configuration [J]. | ENERGIES , 2021 , 14 (3) . |
| MLA | Yuan, Dakang 等. "An Improved Analytical Model for Crosstalk of SiC MOSFET in a Bridge-Arm Configuration" . | ENERGIES 14 . 3 (2021) . |
| APA | Yuan, Dakang , Zhang, Yiming , Wang, Xuhong . An Improved Analytical Model for Crosstalk of SiC MOSFET in a Bridge-Arm Configuration . | ENERGIES , 2021 , 14 (3) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Dielectric metamaterials have been proved to have broad applications in the microwave and optical frequency bands. However, as the components of the communication system shrink, the coupling effects caused by tight arrangements between the dielectric structures have not been carefully studied enough yet. In this paper, the deep coupling effects in limited space between the adjacent dielectric metamaterials cubes are investigated. According to the correlation between the coupling effect and the incident wave, the influence of coupling effect on the scattering characteristics of the structure is studied from three aspects: coupling effect parallel to the wave vector/electric field/magnetic field, respectively. Field distributions and constitutive parameters are also demonstrated to illustrate the relationship between the coupling effects and scattering coefficients.
关键词 ：
Mie resonance Mie resonance Dielectric metamaterials Dielectric metamaterials Coupling effects Coupling effects
引用：
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| GB/T 7714 | Gao, Ju , Zhang, Yiming , Sun, Yang et al. Coupling effects in dielectric metamaterials [J]. | RESULTS IN PHYSICS , 2020 , 17 . |
| MLA | Gao, Ju et al. "Coupling effects in dielectric metamaterials" . | RESULTS IN PHYSICS 17 (2020) . |
| APA | Gao, Ju , Zhang, Yiming , Sun, Yang , Wu, Qiang . Coupling effects in dielectric metamaterials . | RESULTS IN PHYSICS , 2020 , 17 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Polarization has always been an important issue in modern communication systems, especially in sensitive measurements. Conventional polarization converters show limited applications due to their large size and narrow bandwidth. In this paper, we demonstrate an ultra-wide band, multifunctional, and highly efficient metamaterial-based polarization converter that is capable of converting a linearly polarized wave into its cross-polarized wave and circularly polarized wave over different frequency bands. The design principle is based on the field transformation theory and the anisotropic plate is made with high/low permittivity strip metamaterials. The simulation results show that the metamaterial-based polarization converter is able to achieve linear-to-linear conversion over 11.5-12.6 GHz, and linear-to-circular conversion over two frequency bands, 3.0-11.5 GHz and 12.6-17.0 GHz, with an average polarization conversion efficiency over 90%. The polarization converter proposed in this paper provides an important stepping stone for future communication systems' polarization control and can also be extended to higher frequency bands.
关键词 ：
high efficiency high efficiency metamaterial metamaterial polarization conversion polarization conversion ultra-wide band ultra-wide band
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| GB/T 7714 | Gao, Ju , Zhang, Yiming , Sun, Yang et al. Ultra-Wide Band and Multifunctional Polarization Converter Based on Dielectric Metamaterial [J]. | MATERIALS , 2019 , 12 (23) . |
| MLA | Gao, Ju et al. "Ultra-Wide Band and Multifunctional Polarization Converter Based on Dielectric Metamaterial" . | MATERIALS 12 . 23 (2019) . |
| APA | Gao, Ju , Zhang, Yiming , Sun, Yang , Wu, Qiang . Ultra-Wide Band and Multifunctional Polarization Converter Based on Dielectric Metamaterial . | MATERIALS , 2019 , 12 (23) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Compared with carrier based sinusoidal pulse width modulation (SPWM), space vector pulse width modulation (SVPWM) is widely used because of its higher current (voltage) utilization factor. In current source converter (CSC), SVPWM technique is harder to achieve than voltage source converter (VSC). To make the implementation of CSC SVPWM technique easier, this paper presents an indirect PWM method, which states that the modulation strategy of three phase CSC can be got from those used in three phase VSC by transforming bi-logic signals to tri-logic signals. In contrast to existing methods, a seven-segment modulation method is proposed. The presented method is validated by simulations, which show that the indirect PWM method has many advantages of easy implementation, low harmonic of AC side current, and low ripples of DC side current, etc.
关键词 ：
CSC CSC indirect PWM indirect PWM seven-segment modulation seven-segment modulation SVPWM SVPWM tri-logic tri-logic
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| GB/T 7714 | Zhang, Jianlin , Zhang, Yiming , Yuan, Dakang . Indirect Modulation for Current Source PWM Converter [C] . 2017 : 745-749 . |
| MLA | Zhang, Jianlin et al. "Indirect Modulation for Current Source PWM Converter" . (2017) : 745-749 . |
| APA | Zhang, Jianlin , Zhang, Yiming , Yuan, Dakang . Indirect Modulation for Current Source PWM Converter . (2017) : 745-749 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The marine controlled source electromagnetic transmitting method could greatly improve the success rate of the offshore drilling and reduce drilling risk greatly. So it has been widely used in the abroad exploration industry of marine oil and gas in recent years. As a primary means of subsea communications, power line communication (PLC) system plays a major role in the marine electromagnetic exploration system. The communications platform of marine controlled source electromagnetic transmission system has been built by PLC system and the LabVIEW software in this paper. The GPS module has been used for time synchronization in this platform. The communication between the deck control platform and subsea uses the PLC system. And marine transmitter control platform could timely display and save the information of the operating, operating current and operating frequency in the subsea system. The experiment results verify that this platform could work stably for a long time and have the high transmission rate about 1kb / s.
关键词 ：
LabVIEW LabVIEW marine electromagnetic transmitting system marine electromagnetic transmitting system PLC system PLC system the deck control platform the deck control platform
引用：
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| GB/T 7714 | Ren, Xiguo , Zhang, Yiming , Tao, Haijun et al. Design of Control Platform for the Marine Electromagnetic Transmitting System based on PLC System and LabVIEW [C] . 2016 : 88-92 . |
| MLA | Ren, Xiguo et al. "Design of Control Platform for the Marine Electromagnetic Transmitting System based on PLC System and LabVIEW" . (2016) : 88-92 . |
| APA | Ren, Xiguo , Zhang, Yiming , Tao, Haijun , Zhu, Xuezheng . Design of Control Platform for the Marine Electromagnetic Transmitting System based on PLC System and LabVIEW . (2016) : 88-92 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The Forward Switch mode power supply is good selection for power supplies of Unmanned Aerial Vehicle (UAV). Compared with the conventional forward converter, there is one auxiliary switch in the active clamp forward converter to recycle the energy stored in the transformer leakage in order to minimize the voltage stress of the main switch. The power system is designed and the operation characteristics of the active switching power supply are revealed by analysis a typical second-order system in this paper. Active Clamp Forward Converter reduce the generation of EMI, the EMC of UAV equipment is greatly improved. The results of the analysis are verified by SPICE simulation.
关键词 ：
Active Clamp Active Clamp EMI EMI Forward Converter Forward Converter second-order system second-order system
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| GB/T 7714 | Cao, Zhiwen , Zhang, YiMing , Zhang, Xu . Analysis of Active Clamp Forward Converter of UAV [C] . 2013 : 48-51 . |
| MLA | Cao, Zhiwen et al. "Analysis of Active Clamp Forward Converter of UAV" . (2013) : 48-51 . |
| APA | Cao, Zhiwen , Zhang, YiMing , Zhang, Xu . Analysis of Active Clamp Forward Converter of UAV . (2013) : 48-51 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Based on the principle of the three phase voltage source PWM rectifier, firstly, describes the topology of the three-phase VSR, and establishes the three-phase VSR's mathematical model based on the three-phase stationary symmetric coordinate system (a,b,c) and two-phase synchronous rotating coordinate system (d,q); then analysis the three-phase VSR's control strategy, and discusses the feedforward decoupling control strategy of the inner current loop, the outter voltage loop control strategy and the Space Vector PWM (SVPWM) control strategy. Secondly, builds a simulation model, simulates it in Matlab\Simulink environment.The simulation results show that the system has good current waveform of AC side current, high system stability, fast dynamic response speed, and can realize two-way flow of energy, energy feedback, and unit power factor control. © (2013) Trans Tech Publications, Switzerland.
关键词 ：
Computer simulation Computer simulation Dynamic response Dynamic response Electric power factor Electric power factor Innovation Innovation Manufacture Manufacture Mathematical models Mathematical models MATLAB MATLAB Pulse width modulation Pulse width modulation System stability System stability
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| GB/T 7714 | Zhang, Yiming , Zeng, Zhihui , Yufei et al. Design and simulation of the new three- phase voltage source PWM rectifier [C] . 2013 : 343-349 . |
| MLA | Zhang, Yiming et al. "Design and simulation of the new three- phase voltage source PWM rectifier" . (2013) : 343-349 . |
| APA | Zhang, Yiming , Zeng, Zhihui , Yufei , Feng, Jinlan . Design and simulation of the new three- phase voltage source PWM rectifier . (2013) : 343-349 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Stator winding inter turn short-circuit fault is one of the most common internal faults of fault-tolerant machine, which can disconnect the fault phases and keep operating correctly in the event of a failure. Stator winding short-circuit fault model is established through analysis. Based on finite element method, the high-power density fault-tolerant machine internal magnetic field simulation and analysis is implemented using Maxwell2D and induced voltage frequency spectrum is analyzed by FFT method. The characteristics of stator winding short-circuit faults are summarized, which lay a solid foundation for fault-tolerant machine earlier faults prediction and winding switching.
关键词 ：
Finite element method Finite element method Inter turn short-circuit Inter turn short-circuit High-power density High-power density FFT FFT Fault-tolerant machine Fault-tolerant machine Maxwell2D Maxwell2D
引用：
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| GB/T 7714 | Zhang Ming , Zhang Yiming , Tong Jiangtao . Research on Stator Winding Inter Turn Short-circuit Faults of Aeronautical Fault-tolerant Machine Based on Maxwell 2D [C] . 2012 : 119-123 . |
| MLA | Zhang Ming et al. "Research on Stator Winding Inter Turn Short-circuit Faults of Aeronautical Fault-tolerant Machine Based on Maxwell 2D" . (2012) : 119-123 . |
| APA | Zhang Ming , Zhang Yiming , Tong Jiangtao . Research on Stator Winding Inter Turn Short-circuit Faults of Aeronautical Fault-tolerant Machine Based on Maxwell 2D . (2012) : 119-123 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Power supply for Unmanned Aerial Vehicle (UAV) low voltage, high current output, so conventional diode rectifier circuit had been unable to meet the high efficiency in switching power supply, which should selected synchronous rectification (SR). But conventional gate charge retention drive existed dead time and constant drive voltage problems. In this paper, proposes a new gate charge retention drive to improve the phenomenon. Using Saber to analysis the two methods, we could verify the accuracy of the theory. Finally, 72v input 6v/20 output forward converter are designed using the new methods and 90% efficiency is achieved at full load.
关键词 ：
Forward converter Forward converter efficiency efficiency Synchronous rectification Synchronous rectification Drive voltage Drive voltage Dead time Dead time
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| GB/T 7714 | Chen Hena , Zhang Yiming , Wang Haijuan . Application of Synchronous Rectifiers in Power Supply for Unmanned Aerial Vehicle [C] . 2012 : 154-157 . |
| MLA | Chen Hena et al. "Application of Synchronous Rectifiers in Power Supply for Unmanned Aerial Vehicle" . (2012) : 154-157 . |
| APA | Chen Hena , Zhang Yiming , Wang Haijuan . Application of Synchronous Rectifiers in Power Supply for Unmanned Aerial Vehicle . (2012) : 154-157 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
According to the demand of transmitter for deep exploration, this paper presents a strategy of current double closed loop control based on fractional order PI lambda controller, which used to improve the tracing performance and anti-interference capability of the current regulating loop, also the stability of load current. And also presents a modified GA-PSO algorithm to get the parameters of fractional order PI lambda controller. Results show that modified GA-PSO algorithm has faster convergence speed and higher accuracy, new control strategy using in three-phase PWM voltage rectifier has remarkably improved the stability and anti-interference capability of system.
关键词 ：
Current loop Current loop FOPI FOPI Three-phase PWM voltage rectifier Three-phase PWM voltage rectifier Modified GA-PSO Modified GA-PSO
引用：
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| GB/T 7714 | Yu Fei , Zhang Yiming . Research on High Precision and Stability of Three-Phase Rectifier based on Fractional Order PI lambda Controller [C] . 2012 : 2489-2494 . |
| MLA | Yu Fei et al. "Research on High Precision and Stability of Three-Phase Rectifier based on Fractional Order PI lambda Controller" . (2012) : 2489-2494 . |
| APA | Yu Fei , Zhang Yiming . Research on High Precision and Stability of Three-Phase Rectifier based on Fractional Order PI lambda Controller . (2012) : 2489-2494 . |
| 导入链接 | NoteExpress RIS BibTex |
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