Self inversion issue and excess capacitance phenomenon were observed for the first time in relatively thick silicon dioxide (SiO2) in the form of MOS (metal(Al)/SiO2/p type crystalline silicon) structure. Both phenome...Self inversion issue and excess capacitance phenomenon were observed for the first time in relatively thick silicon dioxide (SiO2) in the form of MOS (metal(Al)/SiO2/p type crystalline silicon) structure. Both phenomena were based on minority carriers (electrons in this case) and studied through DC current-applied bias voltage (I-V) and AC admittance measurements in dark/light condition as a function of ambient temperature (295 - 380 K). Either of the cases was the departure of traditional MOS analysis, manifesting themselves in the inversion regime of MOS diode. Increase in frequency/temperature/light intensity within dark and light conditions led to weaken the maxima of hump in C-V curves and finally turned into deep depletion mode after exceeding threshold value of frequency/temperature/light intensity. In resumed conditions, supplementary I-V measurements were carried out to describe the generation and conduction mechanism(s) for minority carriers (electrons).展开更多
A simple method for determining the inverse current of cyclic voltammetry in the processes of steady-state or quasi-steady-state was presented. The experimental result verified the theoretical relation or inverse and ...A simple method for determining the inverse current of cyclic voltammetry in the processes of steady-state or quasi-steady-state was presented. The experimental result verified the theoretical relation or inverse and forward current at microelectrode. Their ratio is proportional to the square root of scan rate.展开更多
The integration of numerous distributed energy resources and power electronic devices introduces a wide spectrum of frequency disturbances,which significantly challenge the stability of modern power systems.Therefore,...The integration of numerous distributed energy resources and power electronic devices introduces a wide spectrum of frequency disturbances,which significantly challenge the stability of modern power systems.Therefore,there is an urgent need to enhance the current monitoring level of modern power systems.This paper proposes a novel busbar current inversion scheme based on an elliptical magnetic sensor array.By establishing a simulation model,the effect of structural parameters of the elliptical array on its current measurement accuracy was analysed.The anti-interference capability of the elliptical array in complex environments such as busbar displacement and crosstalk was studied,and principles for designing array parameters under different current sensor standards were established.Experiments conducted on the proposed current sensing scheme demon-strated that the designed current array has a range of 0-150 A,with a current mea-surement error below 0.1% without external interference and not exceeding 1%during busbar displacement.Under conditions of crosstalk,the measurement accuracy achieved was class 0.5.The sensor array possesses high measurement accuracy,robust anti-interference capability,low power consumption,compact size and a noncontact nature.It exhibits significant potential for extensive application in novel business scenarios within the power system.展开更多
Inductive energy storage systems （IES）require opening switches which are technically much more difficult to realize than closing switches. Institute of Advanced Technology （ IAT ） puts forward a meat grinder with ...Inductive energy storage systems （IES）require opening switches which are technically much more difficult to realize than closing switches. Institute of Advanced Technology （ IAT ） puts forward a meat grinder with an inductive pulse power topology called slow transfer of energy through capacitive hybrid （STRETCH）. In this topology, an integrated gate-commutated thyristor （IGCT） is capable of breaking the charging currents on the order of 4 kA, and it may encounter difficulties in expanding to higher energy systems. German-French Institute of Saint Louis （ISL） has developed a high-power opening switch based on standard high-power thyristors by using their so-called inverse current commutation with semiconductor devices （ICCOS） countercurrent commutation principle. Two topologies of the STRETCH meat grinder with ICCOS are analyzed. And they are compared based on the voltage across the main switch, the current multiplication factor and other aspects by u- sing Matlab simulations. The advantages and disadvantages of the two topologies are shown through the comparisons. Therefore a more suitable topology can be chosen for realistic applications accord- ing to their performances.展开更多
基金This work is financially supported by Yildiz Technical University projects under a contract of 2012-01-01-DOP04 and 2011-01-01-KAP03.
文摘Self inversion issue and excess capacitance phenomenon were observed for the first time in relatively thick silicon dioxide (SiO2) in the form of MOS (metal(Al)/SiO2/p type crystalline silicon) structure. Both phenomena were based on minority carriers (electrons in this case) and studied through DC current-applied bias voltage (I-V) and AC admittance measurements in dark/light condition as a function of ambient temperature (295 - 380 K). Either of the cases was the departure of traditional MOS analysis, manifesting themselves in the inversion regime of MOS diode. Increase in frequency/temperature/light intensity within dark and light conditions led to weaken the maxima of hump in C-V curves and finally turned into deep depletion mode after exceeding threshold value of frequency/temperature/light intensity. In resumed conditions, supplementary I-V measurements were carried out to describe the generation and conduction mechanism(s) for minority carriers (electrons).
文摘A simple method for determining the inverse current of cyclic voltammetry in the processes of steady-state or quasi-steady-state was presented. The experimental result verified the theoretical relation or inverse and forward current at microelectrode. Their ratio is proportional to the square root of scan rate.
基金National Key Research and Development Program of China,Grant/Award Number:2022YFB2402900Science and Technology Project of State Grid,Grant/Award Number:52060023001T。
文摘The integration of numerous distributed energy resources and power electronic devices introduces a wide spectrum of frequency disturbances,which significantly challenge the stability of modern power systems.Therefore,there is an urgent need to enhance the current monitoring level of modern power systems.This paper proposes a novel busbar current inversion scheme based on an elliptical magnetic sensor array.By establishing a simulation model,the effect of structural parameters of the elliptical array on its current measurement accuracy was analysed.The anti-interference capability of the elliptical array in complex environments such as busbar displacement and crosstalk was studied,and principles for designing array parameters under different current sensor standards were established.Experiments conducted on the proposed current sensing scheme demon-strated that the designed current array has a range of 0-150 A,with a current mea-surement error below 0.1% without external interference and not exceeding 1%during busbar displacement.Under conditions of crosstalk,the measurement accuracy achieved was class 0.5.The sensor array possesses high measurement accuracy,robust anti-interference capability,low power consumption,compact size and a noncontact nature.It exhibits significant potential for extensive application in novel business scenarios within the power system.
文摘Inductive energy storage systems （IES）require opening switches which are technically much more difficult to realize than closing switches. Institute of Advanced Technology （ IAT ） puts forward a meat grinder with an inductive pulse power topology called slow transfer of energy through capacitive hybrid （STRETCH）. In this topology, an integrated gate-commutated thyristor （IGCT） is capable of breaking the charging currents on the order of 4 kA, and it may encounter difficulties in expanding to higher energy systems. German-French Institute of Saint Louis （ISL） has developed a high-power opening switch based on standard high-power thyristors by using their so-called inverse current commutation with semiconductor devices （ICCOS） countercurrent commutation principle. Two topologies of the STRETCH meat grinder with ICCOS are analyzed. And they are compared based on the voltage across the main switch, the current multiplication factor and other aspects by u- sing Matlab simulations. The advantages and disadvantages of the two topologies are shown through the comparisons. Therefore a more suitable topology can be chosen for realistic applications accord- ing to their performances.
