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| 1 | Novel Newton’s learning algorithm of neural networks显示文摘Newton’s learning algorithm of NN is presente d and realized . In theory, the convergence rate of learning algorithm of NN based on Newton’s method must be faster than BP’s and other learning algorithms, be cause the gradient method is linearly convergent while Newton’s method has seco nd order convergence rate. The fast computing algorithm of Hesse matrix of the c ost function of NN is proposed and it is the theory basis of the improvement of Newton’s learning algorithm. Simulation results show that the convergence rate of Newton’s learning algorithm is high and apparently faster than the tradition al BP method’s, and the robustness of Newton’s learning algorithm is also bett er than BP method’s. | Long Ning Zhang Fengli | 2006 | Journal of Systems Engineering and Electronics2006，17，2： | 2 |
| 2 | Development of corrector magnet power supply for high energy photon source显示文摘Purpose High Energy Photon Source(HEPS)requires high quality,high energy beam and ultra-low emittance of 0.1 nm·rad,which puts forward high demand for power supply.In this paper,a high-performance corrector magnet power supply is developed to calibrate and adjust beam track within a certain bandwidth range to ensure the stability of beam track.Methods The prototype of power supply adopts the new'One control Two'control mode,which adjusts the performance of two power supplies simultaneously based on digital control.Results The experimental results show that the stability of the power supply is lower than 20 ppm,which is far better than the design index.Voltage ripple is less than 10 mV,and other performance indexes meet the physical design requirements,which can well meet the requirements of HEPS construction.Conclusions After a lot of experiments and tests,all the parameters passed the design indicators.The successful development of this power supply has laid a foundation for the successful application of HEPS. | Han Chao Long Fengli Gao Yao Wei Pengfei Liu Yuting Guo Xiaoling Chen Suying Du Yunze | 2022 | Radiation Detection Technology and Methods2022，6，4： | 1 |
| 3 | Design of digital controller for HEPS corrector power supply显示文摘Purpose In order to realize the control of current closed loop in HEPS corrector power supply,a digital control board is designed.Methods The control board uses the latest FPGA to realize digital processing and uses two different AD chips to realize current and voltage sampling,respectively.In order to achieve high-precision closed-loop control,an effective closed-loop control program is designed.Results The controller has been widely used in HEPS projects,and its control effect has been proved.Conclusions In order to realize control and reduce power cost,the controller is designed.The testing experiments show that the controller has excellent performance,reliable operation and low cost. | Xiaoling Guo Fengli Long Chao Han Yao Gao Wentong Su | 2023 | Radiation Detection Technology and Methods2023，7，3： | 1 |
| 4 | A precision ADC sampling system design显示文摘Introduction The high-energy photon source,which has been built in Huairou,Beijing,has high requirements on magnetic field dithering.Magnetic field dithering is mainly determined by the stability of the output current of the power supply.In order to ensure the stability of the output current of quadrupole magnet power supply,the power supply sampling control loop needs to be precisely designed.In this paper,a precision ADC sampling system based on internal temperature control is designed to carry out precise control of the sampling ADC.Materials In this design,precise ADC chip is used to complete the precise sampling of the system.The precise sampling system contains a DAC system for high-speed settings.Methods In order to verify the design of the system,high-precision quadrupolemagnet power supply is used for measurement.Conclusion The experimental results show that the temperature variation range of precision temperature control ADC system is±0.1°C.By using the precise temperature controlADCsystem,the output current stability of the high-precision quadrupole magnet power supply is effectively improved. | Peng Liu Fengli Long | 2020 | Radiation Detection Technology and Methods2020，4，2： | 0 |
| 5 | Simulation for accelerator dynamic power supply based on current-source PWMrectifier显示文摘Purpose The booster power supply of high-energy photon source is dynamic power supply,and the output is 2-Hz bias sine wave.Current-source rectifier(CSR)topology can achieve the 2-Hz current directly.Methods In order to get the output current and good power factor of the power grid,the algorithm of“indirect current control”is applied.This method needs to measure the voltage of three phases and calculates several certain parameters of the circuit.The control strategy based on the“indirect current control”of the CSR is built in the Simulink simulation environment.Parameters and algorithms are described in detail,and the control block diagram and simulation model are given.Results The control strategy can output the right current and make a good power factor in the side of grid.Conclusions The CSR topology,as a good choice of power supply of accelerator,has a well-researched prospect. | Yang Li Qing Zhou Peng Liu Jing Zhang Fengli Long | 2018 | Radiation Detection Technology and Methods2018，2，2： | 0 |
| 6 | The design of the superconducting wiggler power supply system for HEPS-TF显示文摘Purpose This paper describes the design of power supply system for superconducting wiggler in the project of high energy photon source-test facility.It includes three sets of high precision DC stabilized current power supplies for superconducting magnet excitation and three sets of quench protection assembly(QPA).A special magnetic load which has a very large time constant is studied in this paper.In this paper,a stable superconducting excitation power supply is developed,which can adjust the response quickly under the condition of very large load time constant.Meanwhile,the energy dissipation circuit of the QPA is integrated into the power supply in an active quenching protection mode to accelerate the energy release of the superconducting magnet and protect the superconducting magnet.Method The main circuit topology,control algorithm,quenching protection circuit and interlocking logic function are designed for the superconducting magnet with large inductance.The upper computer controls the switch of the three main power circuits through the serial port,sets the output current and adjusts the parameters according to the load.Conclusion Through a series of scientific and rigorous experiments,the rationality of superconducting wiggler magnet power supply scheme is demonstrated.The output current stability test and output voltage ripple test of the power supply meet or exceed the requirements of the magnet system. | Xu Wang Fengli Long Yao Gao | 2019 | Radiation Detection Technology and Methods2019，3，3： | 0 |
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