Analysis and Real-Time Implementation of High Power Interleaved DC/DC Converter for EV Applications

In electric vehicle (EV) applications, the interleaved bidirectional dc-dc converter (IBC) can be used in place of a high-power conventional dc-dc converter to improve efficiency and reduce the size. The IBC's performance can be enhanced further with proper analysis and control implementation. In the approach of reducing the size of the IBC, ripple current analysis is an extremely essential aspect to consider when choosing the inductor and filter capacitors. A straightforward and generalized method for minimising the current ripple in an N-phase IBC has been described in this paper. Also, to improve converter performance, an average current mode control (ACMC) has been implemented to regulate the output voltage and minimize the current imbalance problem of the designed IBC, considering the effect of sensors signals sampling delay. The sensors signals ADC sampling delay has been measured experimentally, and the same has been considered for designing the inner loop PI control of ACMC. The real-time implementation of the prototype has been developed for a 5kW power level using the dSPACE Micro-Lab box (DS1202).