This page has only limited features, please log in for full access.

Unclaimed
Hongfa Ding
Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Conference paper
Published: 11 July 2021 in Forming the Future
Reads 0
Downloads 0

The magnetic pulse spot welding studied in this paper can achieve the connection of sheet metal with the aid of a field shaper. The magnetic field shaper which is placed between the metal components and an electromagnetic coil has the function of concentrating the magnetic field, enhancing the electromagnetic force around the weld zone; meanwhile, it can protect the electromagnetic coil. This paper carried out a numerical simulation of the principle of the field shaper for magnetic pulse welding of sheet metal by means of the FEA software COMSOL. The electromagnetic and structural parameters of the high-strength coil and field shaper have been designed, and an electromagnetic welding platform is built, the welding experiments of 304 stainless steel sheet and 1060 aluminum sheet both with a thickness of 1 mm are carried out, respectively. The experimental results show that the method can achieve the connection of sheet metal very well.

ACS Style

Hang Zhang; Ning Liu; Qingjian Wang; Hongfa Ding. Simulation and Experimental Analysis of Electromagnetic Pulse Spot Welding of Sheet Metal with a Field Shaper. Forming the Future 2021, 1373 -1382.

AMA Style

Hang Zhang, Ning Liu, Qingjian Wang, Hongfa Ding. Simulation and Experimental Analysis of Electromagnetic Pulse Spot Welding of Sheet Metal with a Field Shaper. Forming the Future. 2021; ():1373-1382.

Chicago/Turabian Style

Hang Zhang; Ning Liu; Qingjian Wang; Hongfa Ding. 2021. "Simulation and Experimental Analysis of Electromagnetic Pulse Spot Welding of Sheet Metal with a Field Shaper." Forming the Future , no. : 1373-1382.

Journal article
Published: 16 April 2021 in Electronics
Reads 0
Downloads 0

A novel three-phase switched-capacitor multilevel inverter (SCMLI) with reduced capacitance and balanced neutral-point voltage is proposed in this paper. Applying only one DC source, the three-phase seven-level topology possessing voltage-boosting capability is accomplished without the high-voltage stress of power switches. Owing to the inherent redundant switching states of the proposed topology, two charging approaches that can effectively limit the voltage ripples and path selection for capacitors can be realized. This provides the presented topology with reduced capacitance, balanced neutral-point voltage, good performance in not only the three-phase four-wire system but also the three-phase three-wire system, and low total harmonic distortion (THD) of the output voltage. A comprehensive comparison with previous SCMLIs in various aspects is conducted to validate the merits mentioned above. The simulation results accord with theoretical analyses, confirming the feasibility of the proposed three-phase SCMLI.

ACS Style

Zhuyu Xun; Hongfa Ding; Zhou He. A Novel Switched-Capacitor Inverter with Reduced Capacitance and Balanced Neutral-Point Voltage. Electronics 2021, 10, 947 .

AMA Style

Zhuyu Xun, Hongfa Ding, Zhou He. A Novel Switched-Capacitor Inverter with Reduced Capacitance and Balanced Neutral-Point Voltage. Electronics. 2021; 10 (8):947.

Chicago/Turabian Style

Zhuyu Xun; Hongfa Ding; Zhou He. 2021. "A Novel Switched-Capacitor Inverter with Reduced Capacitance and Balanced Neutral-Point Voltage." Electronics 10, no. 8: 947.

Journal article
Published: 08 December 2020 in IEEE Transactions on Power Electronics
Reads 0
Downloads 0

The inherent neutral-point (NP) voltage fluctuation of Vienna rectifier could have side effects on the input current quality. However, such effects have not been thoroughly analyzed in the literature yet. In this paper, based on the three-level to two-level space vector modulation (SVM) transformation, a novel method to evaluate the influence of the NP voltage fluctuation on the input current quality is introduced, which could optimize the NP control parameters. The proposed method superimposes the NP voltage fluctuation on the basis vectors, thereby establishing the correlation between the NP voltage fluctuation and the square root mean square (S-RMS) of the input current ripple. The detailed model of the NP oscillation under two-level coordinates is presented. By combining the two-level modulation, NP voltage hysteresis control is adopted to simplify neutral point voltage control and suppress NP low-frequency oscillation. Comprehensive influence of the NP compensation coefficient on the input current quality under NP hysteresis control is obtained, and the hysteresis control parameters are optimized by using the proposed evaluation method. Simulation and experimental results verify the correctness and effectiveness of the proposed evaluation method.

ACS Style

Zhou He; Hongfa Ding; Zibo Chen; Zhuyu Xun; Chang Liu; Dandi Zhang; Jiannan Shao. A Novel Method to Evaluate the Influence of Vienna Rectifier Neutral-Point Voltage Fluctuation on Input Current Quality. IEEE Transactions on Power Electronics 2020, 36, 8347 -8358.

AMA Style

Zhou He, Hongfa Ding, Zibo Chen, Zhuyu Xun, Chang Liu, Dandi Zhang, Jiannan Shao. A Novel Method to Evaluate the Influence of Vienna Rectifier Neutral-Point Voltage Fluctuation on Input Current Quality. IEEE Transactions on Power Electronics. 2020; 36 (7):8347-8358.

Chicago/Turabian Style

Zhou He; Hongfa Ding; Zibo Chen; Zhuyu Xun; Chang Liu; Dandi Zhang; Jiannan Shao. 2020. "A Novel Method to Evaluate the Influence of Vienna Rectifier Neutral-Point Voltage Fluctuation on Input Current Quality." IEEE Transactions on Power Electronics 36, no. 7: 8347-8358.

Original article
Published: 12 June 2020 in The International Journal of Advanced Manufacturing Technology
Reads 0
Downloads 0

Electromagnetic pulse welding (EMPW) is a high-speed welding technology of solid state, which is of great significance to the welding of dissimilar metals. As a practical welding tool, the magnetic field shaper which is placed between the metal components and an electromagnetic coil has the function of concentrating the magnetic field, enhancing the electromagnetic force around the weld zone, and protecting the electromagnetic coil. However, there is a problem of insufficient welding area when using the traditional field shaper for welding. To overcome this issue, this paper carried out a numerical simulation of the principle of the field shaper for electromagnetic pulse welding of sheet metal by the method of joint simulation by ANSYS and COMSOL. The effects of diameter and configuration of the central hole of the field shaper on the peak value and distribution of the electromagnetic force upon the sheet metal were analyzed by simulation. Based on the results of the simulation, a novel field shaper with a slow-varying central hole was proposed, which can effectively improve the peak value and the uniformity of the distribution of the electromagnetic force. In the context, a new welding coefficient R is first proposed to evaluate the welding capability of the field shaper. On the basis of simulation, an electromagnetic welding platform was built for the welding of A1060 aluminum sheet to SS304 stainless steel plate both with a thickness of 1 mm. The experimental results show that the proposed field shaper can effectively improve the size of welding region.

ACS Style

Hang Zhang; Ning Liu; Xiaoxiang Li; Fangxiong Deng; Qingjian Wang; Hongfa Ding. A novel field shaper with slow-varying central hole for electromagnetic pulse welding of sheet metal. The International Journal of Advanced Manufacturing Technology 2020, 108, 2595 -2606.

AMA Style

Hang Zhang, Ning Liu, Xiaoxiang Li, Fangxiong Deng, Qingjian Wang, Hongfa Ding. A novel field shaper with slow-varying central hole for electromagnetic pulse welding of sheet metal. The International Journal of Advanced Manufacturing Technology. 2020; 108 (7-8):2595-2606.

Chicago/Turabian Style

Hang Zhang; Ning Liu; Xiaoxiang Li; Fangxiong Deng; Qingjian Wang; Hongfa Ding. 2020. "A novel field shaper with slow-varying central hole for electromagnetic pulse welding of sheet metal." The International Journal of Advanced Manufacturing Technology 108, no. 7-8: 2595-2606.

Journal article
Published: 27 April 2020 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0
ACS Style

Qingjian Wang; Hongfa Ding; Hang Zhang; Yiliang Lv; Haoran Guo; Liang Li. Study of a Post-Assembly Magnetization Method of a V-Type Rotor of Interior Permanent Magnet Synchronous Motor for Electric Vehicle. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.

AMA Style

Qingjian Wang, Hongfa Ding, Hang Zhang, Yiliang Lv, Haoran Guo, Liang Li. Study of a Post-Assembly Magnetization Method of a V-Type Rotor of Interior Permanent Magnet Synchronous Motor for Electric Vehicle. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.

Chicago/Turabian Style

Qingjian Wang; Hongfa Ding; Hang Zhang; Yiliang Lv; Haoran Guo; Liang Li. 2020. "Study of a Post-Assembly Magnetization Method of a V-Type Rotor of Interior Permanent Magnet Synchronous Motor for Electric Vehicle." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.

Journal article
Published: 12 March 2020 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

As a new non-invasive biotechnology, transcranial magnetic stimulation (TMS) is widely used in the treatment of various psychiatric diseases. The stimulation coil of traditional transcranial magnetic stimulator produces a lot of Joule heat during treatment procedures, which leads to low stimulation efficiency. However, discussion about heating problem in TMS is very limited. In this paper, a new transcranial magnetic stimulator which can work continuously is proposed. Its stimulation coil is wound with hollow copper wire and the central hollow part is used to circulate low-temperature deionized water. The cooling deionized water is provided by a small silent chiller. The Joule heat generated during medicals treatment is taken away by the cooling deionized water, so that the temperature of the stimulation coil can be maintained within a safe range. Finite element method is adopted to analyze the intracranial induced electrical field produced by the water-cooling stimulation coil (WSC). Geometric structure of WSC is optimized based on minimum Joule heat. Design of cooling parameters is carried out with coupled multiphysical field analysis. Results prove that the WSC is able to generate the required intracranial induced electrical field. When 3000 pulses are applied, the temperature of the new transcranial magnetic stimulator could be maintained at room temperature, while the temperature rise of the magnetic stimulation without water cooling is 57K.

ACS Style

Xiao Fang; Hongfa Ding; Chang Liu; Xiaofeng Li; Yongheng Huang. Optimum Design of Continuously Workable Transcranial Magnetic Stimulator. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -6.

AMA Style

Xiao Fang, Hongfa Ding, Chang Liu, Xiaofeng Li, Yongheng Huang. Optimum Design of Continuously Workable Transcranial Magnetic Stimulator. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-6.

Chicago/Turabian Style

Xiao Fang; Hongfa Ding; Chang Liu; Xiaofeng Li; Yongheng Huang. 2020. "Optimum Design of Continuously Workable Transcranial Magnetic Stimulator." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-6.

Journal article
Published: 12 March 2020 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

This paper reports the research of post-assembly magnetization of large-power surface-mounted permanent magnet machines (SPMSM). The method of using integrated magnetizing winding wound around the surface of permanent magnet (PM) is utilized. The design procedure and design criteria for post-assembly magnetization scheme are proposed. The difference of magnetization methods for motors of different power levels is studied. The analytical calculation model and finite element analysis (FEA) model are established to calculate the magnetizing current and magnetizing field. Two SPMSMs of 50 kW and 900 kW are selected as prototypes. Corresponding magnetization schemes are designed. Simulation results show that the motors can be fully magnetized by the designed magnetization schemes.

ACS Style

Qingjian Wang; Hongfa Ding; Hang Zhang; Jun Zhou; Guangda Wang; Yiliang Lv; Liang Li. Research of Post-Assembly Magnetization of Large-Power Surface-Mounted Rare-Earth Permanent Magnet Machines With Integrated Magnetizing Winding. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.

AMA Style

Qingjian Wang, Hongfa Ding, Hang Zhang, Jun Zhou, Guangda Wang, Yiliang Lv, Liang Li. Research of Post-Assembly Magnetization of Large-Power Surface-Mounted Rare-Earth Permanent Magnet Machines With Integrated Magnetizing Winding. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.

Chicago/Turabian Style

Qingjian Wang; Hongfa Ding; Hang Zhang; Jun Zhou; Guangda Wang; Yiliang Lv; Liang Li. 2020. "Research of Post-Assembly Magnetization of Large-Power Surface-Mounted Rare-Earth Permanent Magnet Machines With Integrated Magnetizing Winding." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.

Journal article
Published: 09 March 2020 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

Transcranial magnetic stimulation (TMS) has been proven to be effective in treating many psychiatric disorders. The stimulus in-tensity and focality of the TMS coil are normally used to meas-ure the effect of biological stimulation. In order to improve the performance of the coil, the magnetic core can be added to the existing coils to enhance the stimulus intensity and focality of the local space. However, the core loss caused by the high frequen-cy alternating magnetic field in the core should not be neglected. In this paper, the optimal design of transcranial magnetic stimu-lation thin core coil with the trade-off between stimulation effect and heat energy is proposed. By building multi-objective optimi-zation model and using exhaustive search, the dimensions of the magnetic core is reasonably designed, the stimulation effect of the coil can be significantly improved, the heat energy generated by the core can be reduced compared to other core coils. The fi-nite element method is used to analyze and compare the stimula-tion effect before and after adding the magnetic core. The simu-lation results verify the superiority of the proposed design.

ACS Style

Chang Liu; Hongfa Ding; Xiao Fang; Zhixun Wang. Optimal Design of Transcranial Magnetic Stimulation Thin Core Coil With Trade-Off Between Stimulation Effect and Heat Energy. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -6.

AMA Style

Chang Liu, Hongfa Ding, Xiao Fang, Zhixun Wang. Optimal Design of Transcranial Magnetic Stimulation Thin Core Coil With Trade-Off Between Stimulation Effect and Heat Energy. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-6.

Chicago/Turabian Style

Chang Liu; Hongfa Ding; Xiao Fang; Zhixun Wang. 2020. "Optimal Design of Transcranial Magnetic Stimulation Thin Core Coil With Trade-Off Between Stimulation Effect and Heat Energy." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-6.

Journal article
Published: 22 January 2020 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0
ACS Style

Hongfa Ding; Dake Li; Yiliang Lv; Yun Xu; Liang Li; Peichen Li; Yuchao Fang. Design of a 70T Quasi-Continuous High Magnetic Field System with a Dual-Coil Magnet. IEEE Transactions on Applied Superconductivity 2020, 30, 1 -5.

AMA Style

Hongfa Ding, Dake Li, Yiliang Lv, Yun Xu, Liang Li, Peichen Li, Yuchao Fang. Design of a 70T Quasi-Continuous High Magnetic Field System with a Dual-Coil Magnet. IEEE Transactions on Applied Superconductivity. 2020; 30 (4):1-5.

Chicago/Turabian Style

Hongfa Ding; Dake Li; Yiliang Lv; Yun Xu; Liang Li; Peichen Li; Yuchao Fang. 2020. "Design of a 70T Quasi-Continuous High Magnetic Field System with a Dual-Coil Magnet." IEEE Transactions on Applied Superconductivity 30, no. 4: 1-5.

Journal article
Published: 01 January 2020 in IEEE Access
Reads 0
Downloads 0
ACS Style

Hang Zhang; Qingjian Wang; Guangda Wang; Hongfa Ding. Analytical Modeling and Optimization Design of an Electromagnetic Pulse Welding Device With a Field Shaper for Metal Plates. IEEE Access 2020, 8, 187721 -187729.

AMA Style

Hang Zhang, Qingjian Wang, Guangda Wang, Hongfa Ding. Analytical Modeling and Optimization Design of an Electromagnetic Pulse Welding Device With a Field Shaper for Metal Plates. IEEE Access. 2020; 8 ():187721-187729.

Chicago/Turabian Style

Hang Zhang; Qingjian Wang; Guangda Wang; Hongfa Ding. 2020. "Analytical Modeling and Optimization Design of an Electromagnetic Pulse Welding Device With a Field Shaper for Metal Plates." IEEE Access 8, no. : 187721-187729.

Journal article
Published: 16 November 2018 in IEEE Transactions on Power Delivery
Reads 0
Downloads 0

In order to predict the changing trend of the dissolved gas in the transformer oil accurately and guide the condition-based maintenance of power transformer, a combined forecasting model based on cross-entropy is proposed and its application is analyzed. Firstly, a combined forecasting model is established on the basis of radical basis function neural network (RBFNN), back propagation neural network(BPNN), least squares support vector machine (LSSVM) with two different kernel functions and grey model (GM). Then, the weight coefficient of each algorithm is determined by cross-entropy theory. After that, an application method of the combined forecasting model by the pattern of variable time window is proposed for the purpose of arranging the equipment maintenance in advance. In this way, the increased budget due to emergency maintenance can be alleviated and potential loss due to lack of timely maintenance can be reduced. Finally, the accuracy of the combination forecasting method and the effectiveness of the application method are verified by a series of examples.

ACS Style

Chang Liu; Hongzhi Zhang; Zhicheng Xie; Zhixun Wang; Le Chen; Xiangning Lin; Hongfa Ding; Zhengtian Li; Weihong Xiong. Combined Forecasting Method of Dissolved Gases Concentration and Its Application in Condition-Based Maintenance. IEEE Transactions on Power Delivery 2018, 34, 1269 -1279.

AMA Style

Chang Liu, Hongzhi Zhang, Zhicheng Xie, Zhixun Wang, Le Chen, Xiangning Lin, Hongfa Ding, Zhengtian Li, Weihong Xiong. Combined Forecasting Method of Dissolved Gases Concentration and Its Application in Condition-Based Maintenance. IEEE Transactions on Power Delivery. 2018; 34 (4):1269-1279.

Chicago/Turabian Style

Chang Liu; Hongzhi Zhang; Zhicheng Xie; Zhixun Wang; Le Chen; Xiangning Lin; Hongfa Ding; Zhengtian Li; Weihong Xiong. 2018. "Combined Forecasting Method of Dissolved Gases Concentration and Its Application in Condition-Based Maintenance." IEEE Transactions on Power Delivery 34, no. 4: 1269-1279.

Journal article
Published: 12 November 2018 in IEEE Transactions on Plasma Science
Reads 0
Downloads 0

High-stability flat-top pulsed magnetic field, which combines the advantages of pulsed high magnetic field and steady high magnetic field, is widely used in in the fields of physics, biology, and chemistry. The pulsed alternator-rectifier power supply, with controllable output voltage, is suitable to discharge a multicoil magnet to generate a synthetic flat-top magnetic field with high parameters. However, the coupling characteristics of coil current and the time-varying nonlinear characteristics of magnetic field system bring challenges to generate a high-stability flat-top pulsed magnetic field. This paper first adds a decoupling transformer in discharge circuit of the 50-T flat-top pulsed magnetic field system existed at the Wuhan Nation High Magnetic Field Center, Wuhan, China, and hence, the coupling effect of 50-T dual-coil magnet can be eliminated. Then, a control method of high-stability flat-top pulsed magnetic field based on the model predictive control is proposed. A prediction model of rectifier trigger angle is obtained by establishing the mathematical model of the system. A simulation model is built by MATLAB/Simulink to simulate the discharge process, and a 50-T/120-ms flat-top pulsed magnetic field with an accuracy of 400 ppm is generated.

ACS Style

Xiao Fang; Hongfa Ding; Yongheng Huang; Yiliang Lv; Jun Zhou; Zhangfei Zhao; Qingjian Wang. A 50-T High-Stability Flat-Top Pulsed Magnetic Field Energized by a 100-MW Pulsed Alternator-Rectifier Power Supply With Model Predictive Control. IEEE Transactions on Plasma Science 2018, 47, 958 -964.

AMA Style

Xiao Fang, Hongfa Ding, Yongheng Huang, Yiliang Lv, Jun Zhou, Zhangfei Zhao, Qingjian Wang. A 50-T High-Stability Flat-Top Pulsed Magnetic Field Energized by a 100-MW Pulsed Alternator-Rectifier Power Supply With Model Predictive Control. IEEE Transactions on Plasma Science. 2018; 47 (1):958-964.

Chicago/Turabian Style

Xiao Fang; Hongfa Ding; Yongheng Huang; Yiliang Lv; Jun Zhou; Zhangfei Zhao; Qingjian Wang. 2018. "A 50-T High-Stability Flat-Top Pulsed Magnetic Field Energized by a 100-MW Pulsed Alternator-Rectifier Power Supply With Model Predictive Control." IEEE Transactions on Plasma Science 47, no. 1: 958-964.

Conference paper
Published: 01 September 2018 in 2018 IEEE Energy Conversion Congress and Exposition (ECCE)
Reads 0
Downloads 0

With the widespread application of high voltage and high frequency capacitor charging power supply (CCPS), a new hybrid power control strategy (HPCS) is proposed to accelerate the charging speed. In order to limit the switching frequency regulation range of the HPCS, a Boost circuit is used to adjust the DC bus voltage for the LCC resonant CCPS. This new strategy makes the resonant circuit work in continuous current mode (CCM) for the initial charging stage and discontinuous current mode (DCM) for the later stage to realize the constant power charging. The relationships of the output power with the DC voltage and switching frequency are analyzed by the relevant mathematical models, and then a closed-loop hybrid power control system is built to adjust switching frequency and the DC bus voltage. Compared to the traditional control methods, the HPCS can obviously reduce the charging time (by nearly 50%). The MATLAB simulation and prototype experiments are implemented to validate the feasibility of this control strategy.

ACS Style

Yun Xu; Chao Lu; Kaiwen He; Siqi Huang; Peichen Li; Hongfa Ding. Multi-modes Hybrid Power Control Strategy for LCC Resonant Capacitor Charging Power Supply. 2018 IEEE Energy Conversion Congress and Exposition (ECCE) 2018, 1550 -1555.

AMA Style

Yun Xu, Chao Lu, Kaiwen He, Siqi Huang, Peichen Li, Hongfa Ding. Multi-modes Hybrid Power Control Strategy for LCC Resonant Capacitor Charging Power Supply. 2018 IEEE Energy Conversion Congress and Exposition (ECCE). 2018; ():1550-1555.

Chicago/Turabian Style

Yun Xu; Chao Lu; Kaiwen He; Siqi Huang; Peichen Li; Hongfa Ding. 2018. "Multi-modes Hybrid Power Control Strategy for LCC Resonant Capacitor Charging Power Supply." 2018 IEEE Energy Conversion Congress and Exposition (ECCE) , no. : 1550-1555.

Journal article
Published: 30 May 2018 in IEEE Transactions on Plasma Science
Reads 0
Downloads 0

At Wuhan National High Magnetic Field Center, a 100-MVA/100-MJ pulsed generator and two 67.5-MW converter modules have been installed as power supply for pulsed magnets. Long-pulsed magnetic field with 50-T/100-ms flat-top has been produced and 100-T pulse magnetic field is under commissioning by utilizing this pulsed generator converter. In this high-power occasion, the three-phase voltages undergo serious harmonics, large notches, amplitude variation, rapid frequency fluctuation, and phase jump simultaneously. Synchronization method with fast dynamics, excellent harmonics rejection, and smooth time-domain response is expected, which is difficult for the conventional synchronous reference frame phase-locked loop (SRF-PLL). Therefore, this paper presents a new synchronization method based on compensation of phase deviation. In this method, the phase of three-phase voltages, which is achieved by summing filtered phase deviation and phase of a given d-q rotating reference frame, is open-loop computed directly. The main attributes of the method are the fact that its dynamics is independent of the input vector amplitude, better harmonics rejection/dynamics tradeoff, and smooth time-domain response. Comparative experiments are performed between the proposed synchronization method and SRF-PLL.

ACS Style

Tieqiang Ren; Hongfa Ding; Yun Xu; Zhangfei Zhao; Lixia Chen; Yongheng Huang; Jun Zhou. A New Open-Loop Synchronization Method Based on Compensation of Phase Deviation for Pulsed Generator Converter. IEEE Transactions on Plasma Science 2018, 46, 3307 -3312.

AMA Style

Tieqiang Ren, Hongfa Ding, Yun Xu, Zhangfei Zhao, Lixia Chen, Yongheng Huang, Jun Zhou. A New Open-Loop Synchronization Method Based on Compensation of Phase Deviation for Pulsed Generator Converter. IEEE Transactions on Plasma Science. 2018; 46 (10):3307-3312.

Chicago/Turabian Style

Tieqiang Ren; Hongfa Ding; Yun Xu; Zhangfei Zhao; Lixia Chen; Yongheng Huang; Jun Zhou. 2018. "A New Open-Loop Synchronization Method Based on Compensation of Phase Deviation for Pulsed Generator Converter." IEEE Transactions on Plasma Science 46, no. 10: 3307-3312.

Journal article
Published: 05 February 2018 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

Higher magnetic field can provide more opportunities to reveal new phenomena in scientific research. Aiming to achieve a higher magnetic field, Wuhan National High Magnetic Field Center (WHMFC) has designed a power supply system for 100 T mag-netic field under existing power supply conditions in April 2015. The 100 T magnet consisting of three coils is energized by multi power supply system. The outer coil is energized by a pulsed gen-erator-rectifier connected to battery bank in series. The middle coil and the inner coil are energized by two capacitor bank respec-tively. To ensure safety and reliable operation, control sequence as well as protection system for the power system is designed and developed. A test system including the prototype of three-coil magnet is established at WHMFC. And a series of tests are car-ried out on hybrid power supply systems. 73.3 T peak field has been achieved as the highest magnetic field in the test. Test results presented in this paper show the hybrid power supply system is feasible and operable.

ACS Style

Hongfa Ding; Zhangfei Zhao; Chengxi Jiang; Yun Xu; Tonghai Ding; Xiao Fang; Tieqiang Ren; Liang Li; Yuan Pan; Tao Peng. Construction and Test of Three-Coil Magnet Power Supply System for a High-Pulsed Magnetic Field. IEEE Transactions on Applied Superconductivity 2018, 28, 1 -6.

AMA Style

Hongfa Ding, Zhangfei Zhao, Chengxi Jiang, Yun Xu, Tonghai Ding, Xiao Fang, Tieqiang Ren, Liang Li, Yuan Pan, Tao Peng. Construction and Test of Three-Coil Magnet Power Supply System for a High-Pulsed Magnetic Field. IEEE Transactions on Applied Superconductivity. 2018; 28 (3):1-6.

Chicago/Turabian Style

Hongfa Ding; Zhangfei Zhao; Chengxi Jiang; Yun Xu; Tonghai Ding; Xiao Fang; Tieqiang Ren; Liang Li; Yuan Pan; Tao Peng. 2018. "Construction and Test of Three-Coil Magnet Power Supply System for a High-Pulsed Magnetic Field." IEEE Transactions on Applied Superconductivity 28, no. 3: 1-6.

Journal article
Published: 26 January 2018 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

With large energy storage and flexible control capabilities, pulse generator is an ideal power supply for flat-top magnetic fields. However, characteristics of the pulse generator, such as nonline-arity and time variance, are a limitation on improving flat-top stability. Based on the pulse generator power supply for flat-top magnetic field at Wuhan National High Magnetic Field Center, this paper proposes an active regulator for flat-top magnetic field. An optimal control strategy combining selective PI control and repetitive control is proposed to restrain the circulating current between the pulse generator and the active regulator. A 50 T/140 ms flat-top magnetic field with the ripple less than 100 ppm is achieved by applying an active regulator. In order to validate the effectiveness of the optimal control strategy for high stability flat-top magnetic field with an active regulator, experimental data about the triggering angle of the rectifier is utilized in the simula-tion model; the result indicates that the circulating current be-tween the pulse generator and the active regulator is suppressed to a great extent.

ACS Style

Jun Zhou; Hongfa Ding; Zhangfei Zhao; Yongheng Huang; Xiao Fang; Qingjian Wang. Research of Active Regulation for High-Stability Flat-Top Pulsed High Magnetic Field. IEEE Transactions on Applied Superconductivity 2018, 28, 1 -5.

AMA Style

Jun Zhou, Hongfa Ding, Zhangfei Zhao, Yongheng Huang, Xiao Fang, Qingjian Wang. Research of Active Regulation for High-Stability Flat-Top Pulsed High Magnetic Field. IEEE Transactions on Applied Superconductivity. 2018; 28 (3):1-5.

Chicago/Turabian Style

Jun Zhou; Hongfa Ding; Zhangfei Zhao; Yongheng Huang; Xiao Fang; Qingjian Wang. 2018. "Research of Active Regulation for High-Stability Flat-Top Pulsed High Magnetic Field." IEEE Transactions on Applied Superconductivity 28, no. 3: 1-5.

Journal article
Published: 23 January 2018 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

A novel method for obtaining superior intracranial focusing field in transcranial magnetic stimulation is proposed in this paper. In order to improve stimulation intensity and focalization, a semi-ellipse coil pair (SEP) of special coil configuration is de-signed and introduced. Projected onto a plane parallel to stimu-lating target, the two adjacent coils are in semi-ellipse shape. From the front view, the SEP is bended along a symmetrical axis at specific an-gles. Finite-element method is adopted to analyze the relations between the geometric structure characteristics of SEP and the 3D spatial distributions of the induced electromagnetic field pro-duced by SEP. The SEP coil is compared to a conventional figure of eight coil by the positive peak value of intracranial induced electrical field and the focusing area at a target plane located 20mm below the scalp. Results indicate that under similar power loss, the design of SEP makes it possible to enhance the positive peak value of induced electrical field and decrease the fo-cusing area simultaneously. A real human head modeled as ho-mogeneous and isotropic is occupied in this paper to verify our method.

ACS Style

Xiao Fang; Hongfa Ding; Yongheng Huang; Jun Zhou; Qingjian Wang; Zhangfei Zhao. Improved Intracranial Induced Electrical Field in Transcranial Magnetic Stimulation With Semiellipse Coil Pair. IEEE Transactions on Applied Superconductivity 2018, 28, 1 -6.

AMA Style

Xiao Fang, Hongfa Ding, Yongheng Huang, Jun Zhou, Qingjian Wang, Zhangfei Zhao. Improved Intracranial Induced Electrical Field in Transcranial Magnetic Stimulation With Semiellipse Coil Pair. IEEE Transactions on Applied Superconductivity. 2018; 28 (3):1-6.

Chicago/Turabian Style

Xiao Fang; Hongfa Ding; Yongheng Huang; Jun Zhou; Qingjian Wang; Zhangfei Zhao. 2018. "Improved Intracranial Induced Electrical Field in Transcranial Magnetic Stimulation With Semiellipse Coil Pair." IEEE Transactions on Applied Superconductivity 28, no. 3: 1-6.

Journal article
Published: 15 January 2018 in IEEE Transactions on Applied Superconductivity
Reads 0
Downloads 0

High pulsed magnetic field is becoming widely used in physics, biology, and materials. For better performance of scientific experiments, a power supply system for 100 T magnetic field is designed at Wuhan National High Magnetic Field Center. In the preliminary design, the 100 T magnet consists of three coils in a coaxial structure. Because of the multicoil system with strong-coupling structure, the current of the outer coil will drop when the middle coil is fired. And the current drop will cause adverse effects, which increase the burden of power supply and the stress of magnet. Based on the analysis of the mathematical model for power supply circuit, this paper proposes a modified design for power supply system, which is an auxiliary power supply connected in series with primary power supply of the outer coil for the compensation of the current drop. Corresponding parameters, circuit topology, and control strategy of capacitors are also discussed. The simulation results of the modified design of power supply system are presented in this paper.

ACS Style

Zhangfei Zhao; Hongfa Ding; Jun Zhou; Yun Xu; Yongheng Huang; Qingjian Wang; Xiao Fang; Tieqiang Ren; Liang Li; Yuan Pan. Modified Design of Power Supply System for 100 Tesla Pulsed Magnetic Field. IEEE Transactions on Applied Superconductivity 2018, 28, 1 -5.

AMA Style

Zhangfei Zhao, Hongfa Ding, Jun Zhou, Yun Xu, Yongheng Huang, Qingjian Wang, Xiao Fang, Tieqiang Ren, Liang Li, Yuan Pan. Modified Design of Power Supply System for 100 Tesla Pulsed Magnetic Field. IEEE Transactions on Applied Superconductivity. 2018; 28 (3):1-5.

Chicago/Turabian Style

Zhangfei Zhao; Hongfa Ding; Jun Zhou; Yun Xu; Yongheng Huang; Qingjian Wang; Xiao Fang; Tieqiang Ren; Liang Li; Yuan Pan. 2018. "Modified Design of Power Supply System for 100 Tesla Pulsed Magnetic Field." IEEE Transactions on Applied Superconductivity 28, no. 3: 1-5.