The challenge of emission-free transportation is currently a much-discussed
issue that has led to the development of innovative charging solutions. A major
technical challenge for the potential market is the significant charging time involved,
especially for long-range EVs. This chapter develops two design solutions: PhaseShifted Full-Bridge (PSFB) Converter-based battery charger and grid-connected
bidirectional charging schemes for a plug-in EV. A Constant-Current and ConstantVoltage (CC-CV) charging scheme is developed using industrial standards. The
mathematical model of the EV Chargers has also been developed using the above
control scheme to demonstrate Vehicle-to-Grid (V2G) and Grid-to-Vehicle (G2V)
operations. The introductory part discusses the relevance of this topic, emphasizing the
need for fast-charging technologies. After that, we discuss the available options for
DC-DC converters and justify the choice of the PSFB converter, concluding with its
design parameters. The following section compares two different control strategies for
the DC-DC converter, leading to the choice of the CC-CV scheme and its
implementation. Next comes the implementation of the 3-phase Controlled Rectifier,
employing the d-q Current Control approach to regulate the rectifier through advanced
direct-quadrature-coordinate controllers. The schemes are successfully implemented in
the simulation environment for the considered operation mode. The results successfully
present the charge controller performances with CC-CV charging for different
batteries.
Keywords: Bi-directional converter, Battery SOC, Close loop current control, Control in d-q frame, CC-CV scheme, DC-DC converter, DC-AC Inverter, Grid connected operation, Grid to vehicle, Practical charging limit, Switching Scheme of Inverter, Voltage control, Vehicle to grid.
