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Poh Chiang Loh - One of the best experts on this subject based on the ideXlab platform.
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Integrator Design of the Rogowski Current Sensor for Detecting Fast Switch Current of SiC Devices
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019Co-Authors: Lei Ming, Zhen Xin, Changqing Yin, Manxin Chen, Poh Chiang LohAbstract:Accurate measurement of the switch current through a SiC device is especially challenging due to its fast switching speed and low junction capacitance. Its accompanied current sensor must hence have high bandwidth, strong noise-immunity, as well as a non-intrusive prOperty. For these, the Rogowski current sensor (RCS) is particularly suitable. The RCS mainly consists of two parts, i.e. the Rogowski coil and the integrator. The integrator, whose functionality is to reconstruct the current from the output of the coil, is usually realized with an Op-Amp Circuit for wider bandwidth. However, it may suffer from the DC offset, pre-shoot effect, and droOp distortion, which has a significantly negative impact on the performance of the RCS. To alleviate these issues, this paper carries out a systematical study on the inverting and non-inverting active integrators of the RCS, and analyzes an improved non-inverting integrator (INII) in detail for detecting fast switch current of SiC devices. Both the theoretical analysis and experimental results show that the INII can enhance the accuracy of the RCS for detecting the switch current of SiC devices.
S P Ghoshal - One of the best experts on this subject based on the ideXlab platform.
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Optimal designs of nulling resistor compensation and a robust bias based Op Amp Circuit using an evolutionary approach
Iet Circuits Devices & Systems, 2019Co-Authors: Kanchan Baran Maj, Rajib Kar, Durbadal Mandal, S P GhoshalAbstract:This article suggests an evolutionary Optimisation method namely symbiotic organisms search (SOS) algorithm-based area Optimised designs of a nulling resistor compensation Circuit and a robust bias-based complementary metal oxide semiconductor (CMOS) analogue Operational Amplifier (Op-Amp) Circuit. SPICE simulator is used to validate the results obtained by using the Optimisation technique SOS. The results obtained by SPICE simulation confirm that all the design specifications are accurately satisfied for both the Circuits considered here. The results also prove that the SOS algorithm is superior to the formerly reported methods in terms of the gain, power dissipation, area etc., for both the individual Circuits.
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evolutionary computation based sizing technique of nulling resistor compensation based cmos two stage Op Amp Circuit
International Journal of High Speed Electronics and Systems, 2017Co-Authors: K B Maji, Rajib Kar, Durbadal Mandal, S P GhoshalAbstract:This article explores the comparative Optimizing efficiency between two PSO variants, namely, Craziness based PSO (CRPSO) and PSO with an Aging Leader and Challengers (ALC-PSO) for the design of nulling resistor compensation based CMOS two-stage Op-Amp Circuit. The concept of PSO is simple and it replicates the nature of bird flocking. As compared with Genetic algorithm (GA), PSO deals with less mathematical Operators. Premature convergence and stagnation problem are the two major limitations of PSO technique. CRPSO and ALC-PSO techniques individually have eliminated the disadvantages of the PSO technique. In this article, CRPSO and ALC-PSO are individually employed to Optimize the sizes of the MOS transistors to reduce the overall area taken by the Circuit while satisfying the design constraints. The results obtained individually from CRPSO and ALC-PSO techniques are validated in SPICE environment. SPICE based simulation results justify that ALC-PSO is much better technique than CRPSO and other formerly ...
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cmos analogue Amplifier Circuits Optimisation using hybrid backtracking search algorithm with differential evolution
Journal of Experimental and Theoretical Artificial Intelligence, 2016Co-Authors: Soumen Mallick, Rajib Kar, Durbadal Mandal, S P GhoshalAbstract:This paper prOposes a novel hybrid Optimisation algorithm which combines the recently prOposed evolutionary algorithm Backtracking Search Algorithm (BSA) with another widely accepted evolutionary algorithm, namely, Differential Evolution (DE). The prOposed algorithm called BSA-DE is employed for the Optimal designs of two commonly used analogue Circuits, namely Complementary Metal Oxide Semiconductor (CMOS) differential Amplifier Circuit with current mirror load and CMOS two-stage Operational Amplifier (Op-Amp) Circuit. BSA has a simple structure that is effective, fast and capable of solving multimodal problems. DE is a stochastic, pOpulation-based heuristic approach, having the capability to solve global Optimisation problems. In this paper, the transistors’ sizes are Optimised using the prOposed BSA-DE to minimise the areas occupied by the Circuits and to improve the performances of the Circuits. The simulation results justify the superiority of BSA-DE in global convergence prOperties and fine tuning a...
Lei Ming - One of the best experts on this subject based on the ideXlab platform.
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Integrator Design of the Rogowski Current Sensor for Detecting Fast Switch Current of SiC Devices
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019Co-Authors: Lei Ming, Zhen Xin, Changqing Yin, Manxin Chen, Poh Chiang LohAbstract:Accurate measurement of the switch current through a SiC device is especially challenging due to its fast switching speed and low junction capacitance. Its accompanied current sensor must hence have high bandwidth, strong noise-immunity, as well as a non-intrusive prOperty. For these, the Rogowski current sensor (RCS) is particularly suitable. The RCS mainly consists of two parts, i.e. the Rogowski coil and the integrator. The integrator, whose functionality is to reconstruct the current from the output of the coil, is usually realized with an Op-Amp Circuit for wider bandwidth. However, it may suffer from the DC offset, pre-shoot effect, and droOp distortion, which has a significantly negative impact on the performance of the RCS. To alleviate these issues, this paper carries out a systematical study on the inverting and non-inverting active integrators of the RCS, and analyzes an improved non-inverting integrator (INII) in detail for detecting fast switch current of SiC devices. Both the theoretical analysis and experimental results show that the INII can enhance the accuracy of the RCS for detecting the switch current of SiC devices.
Afandi Hamzah - One of the best experts on this subject based on the ideXlab platform.
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PEMBUATAN PROTOTIPE ALAT UKUR KESUBURAN TANAH BERBASIS ARDUINO UNO
'LPPM Universitas Muhammadiyah Semarang', 2018Co-Authors: Afandi Hamzah, Ulum, Muchamad Eris RizqulAbstract:Soil fertility is a necessity to support a crOp’s life, and it affects crOp’s growth as well. Based on that, this research to create a prototype to measure soil fertility is conducted. This prototype needs some main components such as an Arduino UNO, iron rod, iron sheeting, a non-inverting Op-Amp Circuit, LCD 16x2 IIC, and a 5V power supply. Arduino UNO acts as a main control on the prototype. The soil fertility sensor is an iron rod and iron sheeting placed parallel to each other. The sensor acts as soil fertility level reader. LCD 16x2 IIC and an LED as an output. Sensor will measure the soil’s fertility and send the information (in voltage) to the non-inverting Op-Amp Circuit to be Amplified. The result of this research indicates that sensor can measure soil fertility. Non-inverting Op-Amp Circuit can Amplify the received signal and forward the signal to Arduino UNO, which then will be processed and become an LCD and LED output. Voltage measurement result of the humus soil is 643mV and Amplified to 1294mV as an ideal soil for crOps to be planted. With this prototype, soil fertility can be measured. Keywords Arduino Uno, LED, LCD I2C, Op-Amp CA3140, Kesuburan Tana
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PROTOTYPE PENGUKUR KELEMBABAN TANAH DAN INTENSITAS CAHAYA BERBASIS ARDUINO UNO
'LPPM Universitas Muhammadiyah Semarang', 2018Co-Authors: Hardi, Dimas Panji Wira, Afandi HamzahAbstract:Innovation is a goal that can play a critical role in the world of technological develOpment, one of which is as a measuring tool for both technical and non- technical fields, among them is to measure moisture in the soil and the sunlight needed by plants in agriculture. This tool requires basic components in the form of Arduino Uno, cOpper plate, iron plate, non-inverting Op-Amp Circuit, LDR, 16x2 LCD, and a 5V power source. Arduino Uno itself serves as the main control on the tool, LDR, cOpper plate and iron input block as a reader of moisture content in the soil and sunlight intensity, also 16x2 LCD as an output produ d then yed by . block to determine humidity and light intensity. The cOpper and iron plates will read the moisture content in the soil and will provide information in the form of an analo signal, as well as the LDR which will ce an analog signal received from the amount of sunlight captured an received by Aduino Uno. After Arduino Uno reads it, then will be displa the LCD in the form of soil moisture percentage and the amount of LUX / Keywords: Soil Moisture, Plant, Arduino Uno, Sun, Light
James J Whalen - One of the best experts on this subject based on the ideXlab platform.
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Parasitic capacitances can cause demodulation RFI to differ in inverting and noninverting Operational Amplifier Circuits
IEEE 1991 International Symposium on Electromagnetic Compatibility, 1991Co-Authors: H. Ghadamabadi, James J WhalenAbstract:The demodulation RFI responses of an inverting Operational Amplifier (Op Amp) Circuit and a noninverting Op Amp Circuit are compared. The intended voltage gain of the inverting Op Amp Circuit is A/sub 1/=-R2/R1=-10. The intended linear voltage gain of the noninverting Op Amp Circuit is A/sub N1/=(R1+R2)/R1=11. For both Circuits, the resistor values are R1=10 k Omega and R2=100 k Omega . Analysis shows that parasitic capacitances C/sub in/ (between the inverting and noninverting inputs of the Op Amp) and CR1 (shunted across R1) cause the inverting Op Amp Circuit to have better RFI immunity than the noninverting Op Amp Circuit. The derivation is based on the hypothesis that the demodulation RFI response is caused by a second-order nonlinearity so that a 3-dB reduction in the linear voltage gain causes the second-order demodulation RFI response characterized by the transfer function H/sub 2/ to be reduced by 6 dB. For the assumed values of C/sub in/=8 pF and CR1=0.4 pF. the measured and calculated values of the difference between H/sub 2/ values for the inverting and noninverting Circuits were in good agreement.
