Abstract
Conventional plug-in electric vehicle (PEV) battery chargers only allow unidirectional power conversion from grid to the PEV battery hence cannot be used for Vehicle-to-Grid functionality in smart grid applications. PEV batteries from different automobile manufacturers come with different charging requirements. Moreover, the grid conditions may vary depending on the charging location. Hence, an universal, dual-stage on-board charger topology is presented that can achieve efficient bidirectional power conversion with a wide input and output voltage range to suit charging requirement of different PEV batteries. The first stage is based on a Manitoba converter, which is a grid-connected converter with bridgeless buck-boost topology that can act as a rectifier or inverter depending on the mode of operation in an extensive range of input-output voltage. The second stage is a high frequency transformer based Dual Active Bridge DC/DC converter to provide galvanic isolation and facilitate bidirectional power flow. The operation of the proposed system is successfully verified in simulation environment as well as its performance experimentally verified by implementation of a 800W hardware prototype.
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