A new single-stage high-efficiency photovoltaic(PV)/grid-interconnected dc charging system for transportation electrification

In this paper, a single stage highly efficient photovoltaic grid interconnected charging infrastructure has been designed for off-board DC charging for electric vehicles. This paper starts with the design of a single phase H-bridge quasi-z-source inverter (qZSI), component design and the pulse width modulation technique used. Then it discusses the control techniques used to control the power flow from the photovoltaic to the grid. The versatile qZSI topology has been used for the battery charging system using traditional controls to connect a 2 kW solar array to the AC grid. An EV battery charger has been then designed using the highly efficient full bridge DC-DC converter employing primary side Zero Voltage Switching (ZVS) using the LLC topology for a wide output voltage range. Finally, the simulated performances of the power flow have been shown with and without the EV battery charger.