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design and performance of an EMI filter to reduce conducted EMI in an isolated full bridge buck converter power supply

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Journal of Harbin Institute of Technology(New Series) 2005年第3期12卷 231-234页

作者： Abdolreza Esmaeli 李思孙力赵克姜保军 Dept. of Electrical Engineering Harbin Institute of Technology Harbin 150001 China Dept. of National Radiation Protection Iranian Nuclear Regulatory Authority P.O.Box: 14155-4494 Tehran Iran

EMI filter design and Performance for isolated full bridge buck converter is developed in this paper. In order to design a high performance EMI filter, many issues need to be considered beforehand. Some important issues including accurate model of converter components, parasitic elements, its effect on EMI noise and impedance mismatch are included in this paper. A numerical prediction of EMI/EMC has the potential to evaluate EMI performances at the design stage and before prototyping. It can also help reduce the post-prototype EMC cost by minimizing late redesign and modifications of a design implementation. Saber simulator is used to analyze the EMI noises and EMI filter’s performance. Conducted EMI noise measurement and EMI filter design of isolated full bridge buck converter has been achieved while successfully satisfying the FCC class B limits in the frequency range from 150 kHz to 30 MHz. Simulation results are compared with experimental data and the effectiveness of the EMI simulation approach is demonstrated.

关键词： Isolated full bridge buck converter saber simulator EMI EMC filter design

Optimal design and verification of temporal and spatial filters using second-order cone programming approach

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Science in China(Series F) 2006年第2期49卷 235-253页

作者： YAN Shefeng MA Yuanliang Institute of Acoustic Engineering Northwestern Polytechnical University Xi'an 710072 China

Temporal filters and spatial filters are widely used in many areas of signal processing. A number of optimal design criteria to these problems are available in the literature. Various computational techniques are also presented to optimize these criteria chosen. There are many drawbacks in these methods. In this paper, we introduce a unified framework for optimal design of temporal and spatial filters. Most of the optimal design problems of FIR filters and beamformers are included in the framework. It is shown that all the design problems can be reformulated as convex optimization form as the second-order cone programming （SOCP） and solved efficiently via the well-established interior point methods. The main advantage of our SOCP approach as compared with earlier approaches is that it can include most of the existing methods as its special cases, which leads to more flexible designs. Furthermore, the SOCP approach can optimize multiple required performance measures, which is the drawback of earlier approaches. The SOCP approach is also developed to optimally design temporal and spatial two-dimensional filter and spatial matrix filter. Numerical results demonstrate the effectiveness of the proposed approach.

关键词： filter design beamformer design spatial filter design second-order cone programming.

design OF MAXIMALLY FLAT FIR filterS BASED ON EXPLICIT FORMULAS COMBINED WITH OPTIMIZATION

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Transactions of Tianjin University 2006年第1期12卷 13-18页

作者：滕建辅董健李锵关欣 SCHOOL OF ELECTRONIC INFORMATION ENGINEERING TIANJIN UNIVERSITY TIANJIN 300072CHINA

A maximally flat FIR filter design method based on explicit formulas combined with simulated annealing and random search was presented. Utilizing the explicit formulas to calculate the ini- tial values, the firate-word-length FIR filter design problem was converted into optimization of the filter coefficients, An optimization method combined with local discrete random search and simulated annealing was proposed, with the result of optimum solution in the sense of Chebyshev approximation. The proposed method can simplify the design process of FIR filter and reduce the calculation burden. The simulation result indicates that the proposed method is superior to the traditional round off method and can reduce the value of the objective function to 41%～74%.

关键词： filter design MaxFlat filter simulated annealing random search

Iterative Learning Controller design for CNC Machine Tools

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Journal of Harbin Institute of Technology(New Series) 2020年第6期27卷 1-16页

作者： Jiangang Li Xiaodong Wang Miaosen Chen Yiming Ma School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055GuangdongChina KEJIE Machinery Automation Co. Ltd.Jiangmen 529030GuangdongChina

The repetitive processing and large quantity of single product represented by 3C products are urgently ***,for current processing operations,previous processing data have not been used in the optimization of control *** order to utilize previous processing data to facilitate the next process and avoid adverse effects caused by repetitive disturbance and noise,the idea of iterative learning was introduced to improve the accuracy of *** the control level,since it is difficult to obtain high accuracy by traditional feedback control when faced with complex trajectories,an open⁃loop iterative learning controller and a position loop feedback controller were introduced,which worked fast with good convergence *** at reducing the influence of accidental error,step type iterative learning was put *** iteration mechanism was stopped when the accuracy converged to the allowable range so as to reduce computational complexity,store the current iterative part of the control input,and make constant value ***,in simulation and experiment,it was found that after superposition of the iterative learning controller,the phenomenon of partial divergence of the system tracking error ***,the speed and acceleration characteristics of input trajectories in time domain and frequency domain were ***⁃frequency noise was introduced in frequency domain,which was found to be the cause of the abovementioned phenomenon,and high⁃frequency components were filtered to solve the *** further improve the accuracy of convergence and avoid filtering effective high⁃frequency information in some area,a switchable filter based on the analysis of the frequency characteristics of input trajectory was *** SIMULINK simulation and dSPACE experimental verification,it was proved that the iterative learning controller of modifying controlled quantity and filter based iterative learning control method are effective.

关键词： iterative learning control ladder iterative learning switchable iterative mechanism filter design switchable filter design

Conducted EMI Suppression in Plasma Cutting Power Supply

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Plasma Science and Technology 2005年第6期7卷 3170-3173页

作者： Abdolreza Esmaeli 孙力赵克 National Radiation Protection Department Iranian Nuclear Regulatory Authority Tehran IranElectrical Engineering and Automation School Harbin Institute of Technology Harbin 150001 China Electrical Engineering and Automation School Harbin Institute of TechnologyHarbin 150001 China

A systematic approach to the design of the conducted electromagnetic interference （EMI） filter of high-density plasma cutting power supply has been developed. Converter components have been accurately modeled, with parasitic elements extracted to reveal their impacts on the EMI noises. Circuit simulations have been used to analyze and minimize the EMI noises. Conducted EMI noise measurement and filter design of this power supply have been achieved which successfully satisfy the FCC class B limits in the frequency range from 150 kHz to 30 MHz. The analyses and experimental results show that the designed filter guarantees that the required attenuation will be achieved.

关键词： conducted electromagnetic interference (EMI) plasma cutting power supply electromagnetic compatibility (EMC) saber designer filter design

Simplified Method of designing FIR filter with Controllable Center Frequency

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Transactions of Tianjin University 2010年第4期16卷 262-266页

作者：黄翔东褚晶辉吕卫崔海涛王兆华 School of Electronics and Information Engineering Tianjin University

A novel simplified method is presented to design FIR filter with controllable center frequency. The properties of transfer curves for all-phase filters are illustrated under 3 windowing conditions. By combining single-window all-phase filter design steps and double phase-shift combination, a series of design formulas for point-pass filter, notch filter, band-pass filter and band-stop filter are derived, thus the design computation complexity is greatly reduced. Experiments prove that the center frequency of all the filters can be accurately specified at arbitrary position by adjusting frequency parameters m and λ.

关键词： filter design all-phase double phase-shift combination center frequency

Fault Estimation with Biased Process Noise Covariances

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Fault Estimation with Biased Process Noise Covariances

SUPPRESSING CONDUCTED EMI FROM A DC/DC HIGH POWER CONVERTER BASED ON MIXED-MODE filter

第36届中国控制会议

作者： Ye Zhao Xiao He Donghua Zhou Department of Automation TNListTsinghua University College of Electrical Engineering and Automation Shandong University of Science and Technology

ISBN: (纸本)9781538629185

Fault estimation with performance analysis is investigated in the least squares sense for a class of time-varying systems with event-triggered measurement transmission and biased process noise *** most other work,process noise covariance is assumed as either completely *** this paper,we relax the assumption of knowing the exact process noise covariance and apply an event-triggered strategy when considering the measurement output transmission to remote estimator.A filter is designed in order to achieve the minimization on the upper bound of the filtering error covariance with event-triggered measurement transmission and biased process noise *** desired filter parameters are calculated recursively with the least squares method,which is suitable for online *** is found that the deviation of filtering error covariance is dependent on the deviation of process noise covariance with the performance of the proposed filter with biased process noise covariance further analyzed.A numerical simulation is utilized to illustrate the effectiveness of the proposed algorithm.

关键词： fault estimation biased process noise filter design performance analysis

来源： cnki会议评论

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Journal of Pharmaceutical Analysis 2005年第2期17卷 19-22,50页

作者：薛文彦马西奎 School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 China

Conducted electromagnetic interference (EMI) from a 7.5kVA DC/DC high power converter is investigated to agree with EN class A. Here in some passive methods of suppressing conducted EM Noise, such as mixed-mode (MM) EMI filters, snubbing circuits and other means, are used. Based on measurement, the sources of noise are detected with the characteristics analyzed in detail. The MM EMI filters is valuable means with which low-frequency part and some of the high frequency part of conducted EM Noise can be efficiently reduced. How to lay out the MM filters on both sides of the converter is outlined in detail. In addition, multiple grounding and RDC snubbing circuits are employed to improve the performance in high frequency. The experimental results confirm the methods adopted.

关键词： DC/DC converter conducted EMI electromagnetic compatibility filter design

design OF FAN filterS WITH ARBITRARY ANGLE AND±45° ORIENTATION

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DESIGN OF FAN FILTERS WITH ARBITRARY ANGLE AND±45° ORIENTA...