Single event latch-up (SEL) is a significant issue for electronics design in space application, which would cause large currents in electronic devices, and may lead to burning out of devices. A new monitoring circuit ...Single event latch-up (SEL) is a significant issue for electronics design in space application, which would cause large currents in electronic devices, and may lead to burning out of devices. A new monitoring circuit based on current-comparing method is designed to protect the electronics away from SEL’s damage in radiation environment. The response time of protection circuit has been analyzed. The signal simulation results indicated that the operating time of the SEL protection circuit is dependent on the action time of current comparator and system application recovery time. The function of the monitoring circuit protection device away from SEL’s damage has validated through experiment at last.展开更多
The electrostatic discharge(ESD)protection circuit widely exists in the input and output ports of CMOS digital circuits,and fast rising time electromagnetic pulse(FREMP)coupled into the device not only interacts with ...The electrostatic discharge(ESD)protection circuit widely exists in the input and output ports of CMOS digital circuits,and fast rising time electromagnetic pulse(FREMP)coupled into the device not only interacts with the CMOS circuit,but also acts on the protection circuit.This paper establishes a model of on-chip CMOS electrostatic discharge protection circuit and selects square pulse as the FREMP signals.Based on multiple physical parameter models,it depicts the distribution of the lattice temperature,current density,and electric field intensity inside the device.At the same time,this paper explores the changes of the internal devices in the circuit under the injection of fast rising time electromagnetic pulse and describes the relationship between the damage amplitude threshold and the pulse width.The results show that the ESD protection circuit has potential damage risk,and the injection of FREMP leads to irreversible heat loss inside the circuit.In addition,pulse signals with different attributes will change the damage threshold of the circuit.These results provide an important reference for further evaluation of the influence of electromagnetic environment on the chip,which is helpful to carry out the reliability enhancement research of ESD protection circuit.展开更多
In order to obtain reasonable schemes of arrester in converter stations, the arrester scheme of "Xiluodu-Guangdong HVDC ± 500 kV double circuit transmission" project against lighting induced overvoltage...In order to obtain reasonable schemes of arrester in converter stations, the arrester scheme of "Xiluodu-Guangdong HVDC ± 500 kV double circuit transmission" project against lighting induced overvoltage, which was designed according to the main principle of lightning protection in converter station, is discussed. A calculation of the lighting induced overvoltage in Zhaotong converter station un- der various operation modes is performed with ATP-EMTP software, then the surge arrester configuration of the converter station is decided, and the arrester protection schemes of smoothing reactor and neutral line are studied. It is concluded that additional protection is necessary because of the relatively large gap between protected disconnecting switch and arrester of metallic return transfer bus. Plus, the smoothing reactor (SR) arrester near the valve hall could be removed to improve the scheme’s economic performance.展开更多
The essential requirements of IGBT drive circuit is expounded.The short-circuit characteristic and over-current protection of the IGBT are described in detail.Finally,the practical drive and protection circuits are de...The essential requirements of IGBT drive circuit is expounded.The short-circuit characteristic and over-current protection of the IGBT are described in detail.Finally,the practical drive and protection circuits are designed.The practical results show that the circuit is good in performance.展开更多
柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分...柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分支分组方式,相应的主保护配置方案保护死区虽小(0.5%)但对相间短路存在保护死区——发生在每相未装设分支电流互感器(TA)的第4分支之间,利用柔性光学TA绕制灵活的特点,通过增设每相第4分支的光学TA及对应的不完全纵差保护即可消除上述相间短路保护死区。上述主保护定量化改造思路将为后续奇数多分支大型发电机的技术改造提供借鉴。展开更多
文摘Single event latch-up (SEL) is a significant issue for electronics design in space application, which would cause large currents in electronic devices, and may lead to burning out of devices. A new monitoring circuit based on current-comparing method is designed to protect the electronics away from SEL’s damage in radiation environment. The response time of protection circuit has been analyzed. The signal simulation results indicated that the operating time of the SEL protection circuit is dependent on the action time of current comparator and system application recovery time. The function of the monitoring circuit protection device away from SEL’s damage has validated through experiment at last.
基金National Natural Science Foundation of China(61974116)。
文摘The electrostatic discharge(ESD)protection circuit widely exists in the input and output ports of CMOS digital circuits,and fast rising time electromagnetic pulse(FREMP)coupled into the device not only interacts with the CMOS circuit,but also acts on the protection circuit.This paper establishes a model of on-chip CMOS electrostatic discharge protection circuit and selects square pulse as the FREMP signals.Based on multiple physical parameter models,it depicts the distribution of the lattice temperature,current density,and electric field intensity inside the device.At the same time,this paper explores the changes of the internal devices in the circuit under the injection of fast rising time electromagnetic pulse and describes the relationship between the damage amplitude threshold and the pulse width.The results show that the ESD protection circuit has potential damage risk,and the injection of FREMP leads to irreversible heat loss inside the circuit.In addition,pulse signals with different attributes will change the damage threshold of the circuit.These results provide an important reference for further evaluation of the influence of electromagnetic environment on the chip,which is helpful to carry out the reliability enhancement research of ESD protection circuit.
基金Project supported by Key Project of National Natural Science Foundation of China （50737003）.
文摘In order to obtain reasonable schemes of arrester in converter stations, the arrester scheme of "Xiluodu-Guangdong HVDC ± 500 kV double circuit transmission" project against lighting induced overvoltage, which was designed according to the main principle of lightning protection in converter station, is discussed. A calculation of the lighting induced overvoltage in Zhaotong converter station un- der various operation modes is performed with ATP-EMTP software, then the surge arrester configuration of the converter station is decided, and the arrester protection schemes of smoothing reactor and neutral line are studied. It is concluded that additional protection is necessary because of the relatively large gap between protected disconnecting switch and arrester of metallic return transfer bus. Plus, the smoothing reactor (SR) arrester near the valve hall could be removed to improve the scheme’s economic performance.
文摘The essential requirements of IGBT drive circuit is expounded.The short-circuit characteristic and over-current protection of the IGBT are described in detail.Finally,the practical drive and protection circuits are designed.The practical results show that the circuit is good in performance.
文摘柔性光学电流互感器(flexible optical current transformer,FOCT)在水电领域的推广应用,为奇数多分支发电机主保护定量化改造奠定了基础。经内部故障的全面分析计算,某每相7分支的大型发电机主保护定量化设计结果推荐采用“3-1-3”分支分组方式,相应的主保护配置方案保护死区虽小(0.5%)但对相间短路存在保护死区——发生在每相未装设分支电流互感器(TA)的第4分支之间,利用柔性光学TA绕制灵活的特点,通过增设每相第4分支的光学TA及对应的不完全纵差保护即可消除上述相间短路保护死区。上述主保护定量化改造思路将为后续奇数多分支大型发电机的技术改造提供借鉴。
