Rapid Prototyping of Bidirectional DC-DC Converter Control Using FPGA for Electric Vehicle Charging Applications

In this work, we present Hardware-in-Loop (HIL) demonstration of a closed-loop control of non-ideal 20 kW bidirectional DC-DC converter operating in continuous conduction buck and boost mode. The DC-DC converter is designed and analyzed using small-signal modeling for the buck and boost modes. The discrete PI controller is implemented on the FPGA and is designed using Ziegler Nichols method to eliminate the undesired effects in the transient and steady-state output. The DC-DC converter is a modeled and simulated in MATLAB Simulink and is interfaced with the FPGA-based controller in a HIL configuration as proof of concept for rapid prototyping of an electrical vehicle battery system. The work also discusses the performance of designed closed-loop feedback controller.