In this paper, the HIL simulation for DC-DC converter is investigated. The converter is applied in an electric vehicle to operate motors and inverters. These are connected to three phase interleaved DC-DC converter to reduce the ripple current between a converter and an inverter. Active elements in power parts of the converter can be decreased in size by the three phase interleaved type. Because the mean value method simulates the system every PWM pulse, the sampling time is same PWM switch period. Limited sampling time shows simplified signals of voltages and currents. Field Programmable Gate Arrays (FPGAs) board is used for HIL simulation for the converter. Through applying FPGA board for simulation, the sampling frequency is much higher than switching frequency of the PWM at least 10 times. And the simulation results are very similar to real signals, it called over sampling mode. Power level of dc-dc converter is simulated in Matlab Simulink environment using a Xilinx System Generator implemented in a Xilinx Spartan-5 FPGA board. The simulation environment is presented by comparing the two types of sampling methods.
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