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The recent trend in distributed power generation system is combination of one or more energy sources like solar and fuel cells also wind has been tied together. Attempt made in a double input dc-dc converter topology used to couple the energy sources using z-source converters. The z-network topology has its own unique features and capable of buck or boost operation depending on whether it is voltage or current fed drives. Analyze the various states of z-source dc-dc converter completed using computer simulation in Matlab/simulink Software. Simulated waveforms of resistive load voltage and currents and diodes currents are presented.

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This paper deals with the closed loop operation of semi-dual active bridge(S-DAB) converter for battery charger applications. The semi-dual active bridge (S-DAB) converter is obtained from Dual Active Bridge converter (DAB) by replacing the active (four switches) to semi-active (two switches) on the load side. As the no of switches are less when compared to Dual Active Bridge converter (DAB), it has high efficiency, unidirectional power flow and less stress on switches. Along with the above advantages it undergoes zero voltage switching (ZVS) without the requirements of any active or passive components. A controller is also designed for the enhancement of the closed loop operation of the semi-dual active bridge (S-DAB) converter. Hence it can be used for high/low voltage applications. The complete design and simulation of the semi-dual active bridge (S-DAB) converter with the controller is carried out in MATLAB/ Simulink Keywords-Dual Active Bridge (DAB) Converter; Semi-Dual Active Bridge (S-DAB) Converter; Zero Voltage Switching (ZVS).