Abstract: Bidirectional DC-DC Converter (BDC) play an important role, as an interface circuit between the energy sources and the DC link in variety of industrial applications such as Uninterruptible Power Supply (UPS) units, electric vehicle (EV) and so on. Hence, BDC’s are gaining popularity in academic research and industrial applications. The converters manage bidirectional power flow between dc sources and the loads. The excess energy is stored in batteries or super capacitors. The disadvantages of non-isolated BDC’s are high voltage stress on the switches, more output ripple, low voltage gain ratio and hard switching operation. In order to overcome these issues, a new non-isolated BDC with coupled inductor was proposed. The advantage of this converter are, high efficiency, low output voltage and current ripple, high voltage gain ratio and also provides soft switching operation. The design, modelling, and simulation of non-isolated bidirectional DC-DC converter with coupled inductor method has been carried out in the present work. The present work included a design guideline for selecting output filter parameters, as well as a thorough overview of different modes of operation and the proposed switching scheme. The PWM technique with suitable PI controller was used to generate gate pulses for the proposed Converter. The performance of the proposed topology was observed by simulation in MATLAB-Simulink software tool. The analysis of closed loop operation using PI Controller was also carried out during the work. The simulation results showed the measurement of output voltage, output current, inductor ripple current for both buck and boost modes of operation of the proposed converter for a resistive load. For the input voltage of 120V DC, the current drawn was 1.98A with a step-down voltage of 48 V DC during buck mode of operation. For the input voltage of 48V DC, the current drawn was 0.834A with a step-up voltage of 120V DC during boost mode of operation. The simulation results showed that the efficiency of converter in boost mode and buck mode were 92.6% and 93.1% respectively. The performance of the converter was analysed and the results were discussed.

Keywords: Bidirectional DC-DC Converter (BDC), Zero Voltage Switching (ZVS), Coupled Inductor, MATLAB-Simulink, Pulse Width Modulation (PWM), PI Controller.

| DOI: 10.17148/IJIREEICE.2021.9707