The superconducting tokamak HT-7U [1] has been designed by the Institute of Plasma Physics since 1998 and will be set up before 2003. The 1.2 MW /2.45 GHz HT-7U LHCD (Lower hybrid current drive) system which being the...The superconducting tokamak HT-7U [1] has been designed by the Institute of Plasma Physics since 1998 and will be set up before 2003. The 1.2 MW /2.45 GHz HT-7U LHCD (Lower hybrid current drive) system which being the most efficient non-induction device can heat the plasma and drive the plasma current has been efficiently in operation 'owl and a particular design of the 2.8 MW/-35 kV high-voltage DC power supply has been already completed and will apply to the klystron of LHCD on HT-7 and the future HT-7U, and the project of the power supply has been examined and approved professionally by an authorized group of high-level specialist in the institute of Plasma Physics. The detailed design of the power supply and the simulation results are referred in the paper.展开更多
A -35 kV/2.8 MW/1000s high-voltage power supply (HVPS) for HT-7 superconducting tokamak has been built successfully. The HVPS is scheduled to run on a 2.45 GHz/1 MW lower hybrid current drive (LHCD) [1] system of HT-7...A -35 kV/2.8 MW/1000s high-voltage power supply (HVPS) for HT-7 superconducting tokamak has been built successfully. The HVPS is scheduled to run on a 2.45 GHz/1 MW lower hybrid current drive (LHCD) [1] system of HT-7 superconducting tokamak before the set-up of HT-7 superconducting tokamak in 2003. The HVPS has a series of advantages such as good steady and dynamic response, logical computer program controlling the HVPS without any fault, operational panel and experimental board for data acquisition, which both are grounded distinctively in a normative way to protect the main body of HVPS along with its attached equipments from dangers. Electric power cables and other control cables are disposed reasonably, to prevent signals from magnetic interference and ensure the precision of signal transfer.This paper involves the experiment and operation of a 35 kV/2.8 MW/1000s HVPS [2] for 2.45 GHz/1 MW LHCD system. The reliability and feasibility of the HVPS has been demonstrated in comparison with experimental results of original design and simulation data.展开更多
High Speed Drilling Electrical Discharge Machining (HSDEDM) uses controlled electric sparks to erode the metal in a work-piece. Through the years, HSDEDM process has widely been used in high speed drilling and in manu...High Speed Drilling Electrical Discharge Machining (HSDEDM) uses controlled electric sparks to erode the metal in a work-piece. Through the years, HSDEDM process has widely been used in high speed drilling and in manufacturing large aspect ratio holes for hard-to-machine material. The power supplies of HSDEDM providing high power applica-tions can have different topologies. In this paper, a novel Pulsed-Width-Modulated (PWM) half-bridge HSDEDM power supply that achieves Zero-Voltage-Switching (ZVS) for switches and Zero-Current-Switching (ZCS) for the dis-charge gap has been developed. This power supply has excellent features that include minimal component count and inherent protection under short circuit conditions. This topology has an energy conservation feature and removes the need for output bulk capacitors and resistances. Energy used in the erosion process will be controlled by the switched IGBTs in the half-bridge network and be transferred to the gap between the tool and work-piece. The relative tool wear and machining speed of our proposed topology have been compared with that of a normal power supply with current limiting resistances.展开更多
The effect of a constant current(CC)power supply on the CC ocean observation system is a problem that once was neglected.The dynamic characteristics of the CC power supply may have great influence on the whole system,...The effect of a constant current(CC)power supply on the CC ocean observation system is a problem that once was neglected.The dynamic characteristics of the CC power supply may have great influence on the whole system,especially the voltage behavior in the event of load change.This needs to be examined.In this paper,a method is introduced to check whether the CC power supply can satisfy the dynamic requirements of the CC ocean observation system.An equivalent model to describe the non-ideal CC power supply is presented,through which the dynamic characteristics can be standardized.To verify the feasibility of this model,a minimum system of a single node in the CC ocean observation system is constructed,from which the model is derived.Focusing on the power failure problem,the output voltage responses are performed and the models are validated.Through the model,the dynamic behavior of the CC power supply is checked in a practical design.展开更多
微波具有良好的穿透与吸收特性,可用于医疗领域。作为典型的微波发生装置,磁控管可以将电能转换成微波能量,微波能量聚集后作用于医疗对象,进而产生相应的理疗效果。为了解决微波能量输出过程中的可靠性问题,需要研发相应的控制装置来...微波具有良好的穿透与吸收特性,可用于医疗领域。作为典型的微波发生装置,磁控管可以将电能转换成微波能量,微波能量聚集后作用于医疗对象,进而产生相应的理疗效果。为了解决微波能量输出过程中的可靠性问题,需要研发相应的控制装置来实现磁控管微波能量的持续稳定输出。文中在掌握了磁控管器件工作特性的基础上,设计了基于交流双向斩波控制的磁控管驱动控制系统。该系统实时采样磁控管阳极工作电流,控制器对工作电流进行偏差整定后采用比例积分微分(Proportional Integral Differentiation,PID)进行控制,在电流闭环的方式下实现了磁控管微波的连续可调恒功率输出。作为小型物理型辅助理疗装置,系统经过持续不断的优化,设备在市场上已经得到了广泛应用,取得了较好的应用效果。展开更多
文摘The superconducting tokamak HT-7U [1] has been designed by the Institute of Plasma Physics since 1998 and will be set up before 2003. The 1.2 MW /2.45 GHz HT-7U LHCD (Lower hybrid current drive) system which being the most efficient non-induction device can heat the plasma and drive the plasma current has been efficiently in operation 'owl and a particular design of the 2.8 MW/-35 kV high-voltage DC power supply has been already completed and will apply to the klystron of LHCD on HT-7 and the future HT-7U, and the project of the power supply has been examined and approved professionally by an authorized group of high-level specialist in the institute of Plasma Physics. The detailed design of the power supply and the simulation results are referred in the paper.
基金This work was supported by Meg-Science Enginerring Item of the Chinese Academy of Sciences.
文摘A -35 kV/2.8 MW/1000s high-voltage power supply (HVPS) for HT-7 superconducting tokamak has been built successfully. The HVPS is scheduled to run on a 2.45 GHz/1 MW lower hybrid current drive (LHCD) [1] system of HT-7 superconducting tokamak before the set-up of HT-7 superconducting tokamak in 2003. The HVPS has a series of advantages such as good steady and dynamic response, logical computer program controlling the HVPS without any fault, operational panel and experimental board for data acquisition, which both are grounded distinctively in a normative way to protect the main body of HVPS along with its attached equipments from dangers. Electric power cables and other control cables are disposed reasonably, to prevent signals from magnetic interference and ensure the precision of signal transfer.This paper involves the experiment and operation of a 35 kV/2.8 MW/1000s HVPS [2] for 2.45 GHz/1 MW LHCD system. The reliability and feasibility of the HVPS has been demonstrated in comparison with experimental results of original design and simulation data.
文摘High Speed Drilling Electrical Discharge Machining (HSDEDM) uses controlled electric sparks to erode the metal in a work-piece. Through the years, HSDEDM process has widely been used in high speed drilling and in manufacturing large aspect ratio holes for hard-to-machine material. The power supplies of HSDEDM providing high power applica-tions can have different topologies. In this paper, a novel Pulsed-Width-Modulated (PWM) half-bridge HSDEDM power supply that achieves Zero-Voltage-Switching (ZVS) for switches and Zero-Current-Switching (ZCS) for the dis-charge gap has been developed. This power supply has excellent features that include minimal component count and inherent protection under short circuit conditions. This topology has an energy conservation feature and removes the need for output bulk capacitors and resistances. Energy used in the erosion process will be controlled by the switched IGBTs in the half-bridge network and be transferred to the gap between the tool and work-piece. The relative tool wear and machining speed of our proposed topology have been compared with that of a normal power supply with current limiting resistances.
基金Project supported by the National Natural Science Foundation of China(No.41676089)the Natural Science Foundation of Zhejiang Province,China(No.LY18E090003)the Fundamental Research Funds for the Central Universities,China(No.2018QNA4005)。
文摘The effect of a constant current(CC)power supply on the CC ocean observation system is a problem that once was neglected.The dynamic characteristics of the CC power supply may have great influence on the whole system,especially the voltage behavior in the event of load change.This needs to be examined.In this paper,a method is introduced to check whether the CC power supply can satisfy the dynamic requirements of the CC ocean observation system.An equivalent model to describe the non-ideal CC power supply is presented,through which the dynamic characteristics can be standardized.To verify the feasibility of this model,a minimum system of a single node in the CC ocean observation system is constructed,from which the model is derived.Focusing on the power failure problem,the output voltage responses are performed and the models are validated.Through the model,the dynamic behavior of the CC power supply is checked in a practical design.
文摘微波具有良好的穿透与吸收特性,可用于医疗领域。作为典型的微波发生装置,磁控管可以将电能转换成微波能量,微波能量聚集后作用于医疗对象,进而产生相应的理疗效果。为了解决微波能量输出过程中的可靠性问题,需要研发相应的控制装置来实现磁控管微波能量的持续稳定输出。文中在掌握了磁控管器件工作特性的基础上,设计了基于交流双向斩波控制的磁控管驱动控制系统。该系统实时采样磁控管阳极工作电流,控制器对工作电流进行偏差整定后采用比例积分微分(Proportional Integral Differentiation,PID)进行控制,在电流闭环的方式下实现了磁控管微波的连续可调恒功率输出。作为小型物理型辅助理疗装置,系统经过持续不断的优化,设备在市场上已经得到了广泛应用,取得了较好的应用效果。
