Rogowski coils(RCs)are widely used to measure power or high frequency currents based on their design.In this paper,two types of RCs that are circular(traditional)and cylindrical shapes wound using wire covered by varn...Rogowski coils(RCs)are widely used to measure power or high frequency currents based on their design.In this paper,two types of RCs that are circular(traditional)and cylindrical shapes wound using wire covered by varnish are constructed.This construction is carried out to be suitable for monitoring the discharge current of the surge arrester installed in the distribution system.Concerning high frequency RC modeling for both types considering transfer function is introduced.Self-integrating for both types is attained.Therefore,the experimental tests using function generator for both coils are carried out to identify the parameters of the transfer function representing the introduced model.The measured signals for current and induced voltages are denoised for the parameter identification process.The denoised process is achieved using the MATLAB code‘wdenoise’while the parameters are estimated using the system identification toolbox.Verification of the proposed model is achieved using experimental results for the two coils.The sensitivity of the two coils is investigated based on the induced output voltage.The application concerning the two coils for monitoring the discharge current of the surge arrester is done.The results confirm the accuracy of the introduced RC model,as well as the performance of the cylindrical shape,is better than the traditional one.The simulation is carried out using MATLAB and ATPDraw programs.展开更多
This paper presents a new circuit scheme to control the current surge in the boosting phase of an radio frequency identification-nonvolative memory pump.By introducing a circuit block consisting of a current reference...This paper presents a new circuit scheme to control the current surge in the boosting phase of an radio frequency identification-nonvolative memory pump.By introducing a circuit block consisting of a current reference and a current mirror,the new circuit scheme can keep the period-average current of the pump constantly below the desired level,for example,2.5μA.Therefore,it can prevent the rectified supply of the RFID tag IC from collapsing in the boosting phase of the pump.The presented scheme could effectively reduce the voltage drop on the rectified supply from more than 50%to even zero,but could cost less area.Moreover,an analytical expression to calculate the boosting time of a pump in the new scheme is developed.展开更多
基金funded from Taif University Researchers Supporting Project number(TURSP-2020/264),Taif University,Taif,Saudi Arabia.
文摘Rogowski coils(RCs)are widely used to measure power or high frequency currents based on their design.In this paper,two types of RCs that are circular(traditional)and cylindrical shapes wound using wire covered by varnish are constructed.This construction is carried out to be suitable for monitoring the discharge current of the surge arrester installed in the distribution system.Concerning high frequency RC modeling for both types considering transfer function is introduced.Self-integrating for both types is attained.Therefore,the experimental tests using function generator for both coils are carried out to identify the parameters of the transfer function representing the introduced model.The measured signals for current and induced voltages are denoised for the parameter identification process.The denoised process is achieved using the MATLAB code‘wdenoise’while the parameters are estimated using the system identification toolbox.Verification of the proposed model is achieved using experimental results for the two coils.The sensitivity of the two coils is investigated based on the induced output voltage.The application concerning the two coils for monitoring the discharge current of the surge arrester is done.The results confirm the accuracy of the introduced RC model,as well as the performance of the cylindrical shape,is better than the traditional one.The simulation is carried out using MATLAB and ATPDraw programs.
文摘This paper presents a new circuit scheme to control the current surge in the boosting phase of an radio frequency identification-nonvolative memory pump.By introducing a circuit block consisting of a current reference and a current mirror,the new circuit scheme can keep the period-average current of the pump constantly below the desired level,for example,2.5μA.Therefore,it can prevent the rectified supply of the RFID tag IC from collapsing in the boosting phase of the pump.The presented scheme could effectively reduce the voltage drop on the rectified supply from more than 50%to even zero,but could cost less area.Moreover,an analytical expression to calculate the boosting time of a pump in the new scheme is developed.
