Faculty Publications
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Item Novel active clamped Y-source network for improved voltage boosting(Institution of Engineering and Technology JBristow@theiet.org, 2019) Reddivari, R.; Jena, D.Y-source impedance networks are one of the prominent two-port networks for DC–DC and DC–AC applications with the higher boosting ability and reduced stress across the switching elements. However, the boosting ability of the Y-source converter needs better magnetic coupling between the windings. The loosely coupled inductors cause high-voltage spikes and poor voltage regulation. Use of highly rated switches or incorporation of the proper clamping circuit is essential to improve the performance Y-source converter. It is always better to go with clamping/absorbing circuits instead of the selection of highly rated devices. Various passive and active clamping/absorbing circuits are introduced in literature to suppress the voltage spikes at the expense of higher component count. This article proposes a novel active clamped Y-source impedance network and its family by adding one additional clamping diode to the existing type-I improved Y-source network. Compared to other Y-source networks, the proposed networks absorb the voltage spikes with reduced passive component count and re-utilise the absorbed energy to enhance the voltage gain in the presence of leakage inductance and winding equivalent series resistance. Finally, one of the proposed impedance networks, i.e. an active clamped Y-source DC–DC converter, has been verified experimentally using a ferrite core. © The Institution of Engineering and Technology 2019.Item A Negative Embedded Differential Mode ?-Source Inverter with Reduced Switching Spikes(Institute of Electrical and Electronics Engineers Inc., 2020) Reddivari, R.; Jena, D.Magnetically coupled impedance source networks (MCIS) are capable of producing higher voltage gains at the expense of high switching voltage spikes due to the presence of leakage inductance. These voltage spikes decorate the converter efficiency and life expectancy of switches. Therefore, to reduce the voltage spikes, a negative embedded differential mode gamma source inverter (NEDM ${{\Gamma }}$ ZSI) is presented in this brief. The proposed inverter can achieve higher voltage gains with reduced switching voltage spikes and low capacitor voltage stresses compared to other MCIS networks. Also, the proposed inverter draws continuous input current from the dc mains, having a common ground, and uses the minimum number of component in a circuit. The operating principle of the proposed NEDM ${{\Gamma }}$ ZSI is analyzed in electrical and magnetic domains. The ability of the proposed impedance network, in terms of voltage spike suppression has been verified experimentally using DC-DC converter configuration. Finally, the performance of a NEDM ${{\Gamma }}$ ZSI is validated with simulation and experimental verification using a single-phase inverter configuration. © 2004-2012 IEEE.Item Analysis, Design, and Performance Evaluation of Differential-Mode Y-Source Converters for Voltage Spikes Mitigation(Institute of Electrical and Electronics Engineers Inc., 2020) Reddivari, R.; Jena, D.; Gautham, G.Impedance source converters (ISC) based on the magnetic coupling can enhance their voltage gains by maintaining lower shoot-through duty ratios and reduced passive component count. However, the nonzero leakage inductance in the practical ISC generates high switching voltage spikes resulting in poor voltage regulation. Therefore, an absorbing circuit with additional components is crucial to reduce these voltage spikes and to absorb the energy stored in leakage inductances. This article presents a family of differential-mode Y-source converters (DMYSCs) as an alternative to the latest Y-source converter that mitigates the switching voltage spikes without increasing the number of components. The proposed converters DMYSC-I, DMYSC-II, and improved ?-type Y-source converter are derived from the original Y-source impedance network by altering the winding orientation. In this article, the respective topologies with their working principles are studied and the characteristics are compared with other Y-source converters. Simulation and experimental results have confirmed the abilities of the proposed converters to mitigate their switching voltage spikes. © 1972-2012 IEEE.