i-manager's Journal on Circuits and Systems (JCIR)


Volume 9 Issue 1 January - June 2021

Research Paper

Distortion Analysis for Voltage Controlled Transistor Laser(RETRACTED)

N. Dhenakaran* , M. Charan **, N. K. Hariharan ***
This paper has been retracted as it is not original and had already appeared in the previously published works (Copyright issue).

(i) R. Ramya, S. Piramasubramanian, M. Ganesh Madhan, and D. Rebecca, “ Effect of Collector Voltage on the Large and Small Signal Modulation Characteristics of 980 nm Transistor Laser”, Defence Science Journal, Vol. 70, No. 5, September 2020, pp. 529-533, DOI : 10.14429/dsj.70.16341© 2020, DESIDOC

(ii) R. Ramya , S. Piramasubramanian, “Effect of Franz–Keldysh absorption on the short optical pulse generation in Transistor Laser”, Optics Communications 474 (2020) 126087. https://doi.org/10.1016/j.optcom.2020.126087

Research Paper

Switched Z Source Boost Converter for Three Phase Grid-Connected PV System

S. Pon Monisha* , K. Ajitha **
*-** Department of Electrical and Electronics Engineering, P. S. R. Engineering College, Sivakasi, Tamil Nadu, India.
Monisha, S. P., and Ajitha, K. (2021). Switched Z Source Boost Converter for Three Phase Grid-Connected PV System. i-manager's Journal on Circuits and Systems, 9(1), 8-14. https://doi.org/10.26634/jcir.9.1.18204

Abstract

This project is aimed at the implementation of a fuzzy based maximum power point tracking in transformerless gridconnected PV system along with reactive power compensation. A single diode model is used for PV array and simulation study is performed using Matlab. In the neuro-fuzzy logic controller, voltage and current are taken as inputs and the effective value of AC current corresponding to the maximum power point is the output. As a result, in addition to supplying voltage via the inverter without using transformer to compensate for reactive power not exceeding its power rating. This results in utilization of PV system at night and at periods of low irradiation. Rules relating the input and output of neuro-fuzzy logic controller are written and simulation is performed. A DC-DC Switched Z source Boost Converter is used for maintaining DC input to the inverter at various conditions of irradiation and temperature. Gating pulses to the inverter are generated by PI (Proportional integral) controller. Simulation model of a 1000 W solar panel is developed and the results are obtained with neuro-fuzzy logic controller for different irradiation and temperature conditions. Results show the effectiveness of the proposed method in utilizing the PV system. This project is implemented in Matlab simulation.

Research Paper

Simulation of Three-Phase Matrix Converter of High Frequency Step-Up and Step-Down Operation

Ruksana S. K.*
Department of Electrical and Electronics Engineering, Vasavi College of Engineering, Hyderabad, Telangana, India.
Shiek, R. (2021). Simulation of Three-Phase Matrix Converter of High Frequency Step-Up and Step-Down Operation. i-manager's Journal on Circuits and Systems, 9(1), 15-21. https://doi.org/10.26634/jcir.9.1.18341

Abstract

This paper presents the high frequency step-up and step-down operation of three-phase matrix converter using space vector modulation technique. The technique space vector modulation has several advantages compared with the conventional PWM techniques that have been used to implement converters. With the control of voltage along with the current vector, the required frequency to step-up of high frequency and step-down of high frequency to normal frequency has been achieved using three-phase matrix converter and its results has been presented in this paper. It has been implemented using Matlab/Simulink software and the results of the TPMC have been verified.

Research Paper

Design and Analysis of On-Chip Buck DC-DC Converter for Energy Harvesting and Low Power Applications

S. Anusooya* , P. K. Jawahar **, V. Jean Shilpa ***
*-*** Department of Electronics and Communication Engineering, B. S. Abdur Rahman Crescent Institute of Science and Technology, Chennai, Tamil Nadu, India.
Anusooya, S., Jawahar, P. K., and Shilpa, V. J. (2021). Design and Analysis of On-Chip Buck DC-DC Converter for Energy Harvesting and Low Power Applications. i-manager's Journal on Circuits and Systems, 9(1), 22-28. https://doi.org/10.26634/jcir.9.1.18162

Abstract

Energy harvesting, also known as power harvesting or ambient power, is the mechanism by which energy is obtained from natural sources (e.g. solar power, piezoelectric) collected and processed for portable, autonomous systems, such as those implemented in wearable systems and wireless sensor networks. Solar energy plays a most important role in renewable energy production, since it is clean, smog-free, sustainable energy and due to rising electricity costs, there is a high demand among utility customers. Electromechanical equivalent circuits can be used for dynamic modeling piezoelectric devices. Piezoelectric materials transform mechanical strain into electric charge or voltage through the direct piezoelectric effect during vibration energy harvesting. It can be implemented to convert walking movement from the person body to electrical energy. The converter regulates the flow of power from the piezoelectric part to the preferred electronic load. Investigation of the converter in irregular current conduction mode is an expression for duty cycle power associations. In this paper, the design and analysis of DC-DC buck converter has been carried out for renewable energy and low power applications. The application sensors are tested with Mock temperature sensor, Motion sensor and also using CMOS temperature sensor for low power applications.

Review Paper

A Review Study on Grid-Tied Inverters for Renewable Energy Systems

Venkatesh S.* , Karthik R. **
*-** Department of Electrical and Electronics Engineering, SRM Valliammai Engineering College, Kattankulathur, Tamil Nadu, India.
Venkatesh, S., and Karthik, R. (2021). A Review Study on Grid-Tied Inverters for Renewable Energy Systems. i-manager's Journal on Circuits and Systems, 9(1), 29-35. https://doi.org/10.26634/jcir.9.1.18213

Abstract

Integration of power generated through solar photovoltaic (PV) systems with the utility grid is expanding at a rapid pace. Since the electricity produced by PV systems varies with the weather condition, this may substantially disrupt the stability of a weak utility grid. Grid-tied photovoltaic (PV) inverters are needed to include harmonics mitigation control to minimise harmonics distortion on the output current produced by the effect of grid background harmonics. One of the criteria for a converter for such applications is to have a reduced number of conversion steps and offer isolation. Z- source inverter (ZSI) architecture is possible to eliminate several stages and accomplish voltage boost and DC-AC power conversion in a single stage. The usage of passive components also provides an opportunity to incorporate energy storage systems (ESS) into the grid. The functioning of a Z-source inverter (ZSI) combined with a split main isolated battery charger for DC charging of electric vehicles (EV) batteries. The ZSI architecture utilises two capacitors and two inductors to raise the input DC voltage to meet the inverter side AC output voltage requirements. The functioning of a ZSI relies heavily on the passive components. It offers an opportunity to incorporate energy storage devices into such a system. The criteria established by the utility is fulfilled by the ZSI even during changing input circumstances via control of shoot-through duty ratio. Various Z source inverter topologies are reviewed in this article and contrasted in various ways, such as switches, switching procedures, and modulation methods. The difficulties connected with dynamic variations in load may be addressed by the appropriate design of the closed-loop system. Duty ratio and modulation index are the two essential factors that need to be designed for attaining the buck-boost characteristic of ZSI.