Abstract
A soft-switching dc–dc converter with bidirectional power flow capability is studied in this paper for energy storage units or electric vehicle applications. The circuit topology of the studied converter is constructed using a dual half-bridge circuit with split capacitors. A series resonant tank with frequency control modulation is employed in the proposed circuit to realize the soft switching characteristics of active devices. Synchronous-rectifier-based Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFETs) are used on the low-voltage side to lessen conduction loss on the power semiconductors. The benefits of the studied circuit are bidirectional power flow capability, high efficiency, low switching loss, and simple circuit structure. The achievability of the developed converter is demonstrated from test results with a scaled-down laboratory prototype.
Highlights
Clean energy sources have been developed to lessen the demand of fossil fuel, reduce environmental air pollution, and decrease climate change
For electric vehicles [6,7,8,9], ac/dc converters are employed for the battery charger, dc/dc converters are adopted on the dc power distributing system, and dc/ac converters are used for ac motor drives
Bidirectional dc/dc converters [10,11,12,13,14,15] are widely used for battery-based energy storage units in dc microgrid systems and electric vehicles
Summary
Clean energy sources have been developed to lessen the demand of fossil fuel, reduce environmental air pollution, and decrease climate change. Power-electronics-based energy conversion has been researched and studied to increase energy conversion efficiency and reduce circuit size. For electric vehicles [6,7,8,9], ac/dc converters are employed for the battery charger, dc/dc converters are adopted on the dc power distributing system, and dc/ac converters are used for ac motor drives. Bidirectional dc/dc converters [10,11,12,13,14,15] are widely used for battery-based energy storage units in dc microgrid systems and electric vehicles. Bidirectional dc/dc converters are adopted to transfer electric energy between high voltage dc buses and energy storage units. Among the circuit topologies of bidirectional dc/dc converters, the half-bridge topologies and full-bridge topologies are most attractive solutions to realize bidirectional power flow capability
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