Control of Bidirectional Interleaved DC-DC Converter With Single Current Sensor

Abstract

Current sharing control method for bidirectional interleaved DC-DC converter is presented in this paper. An single-current sampling strategy is proposed to measure and reconstruct the difference of average inductor currents from single current sensor. Based on the theoretical analysis, the proposed control method can restrain the interactions from voltage regulation loop and current sharing loop. In addition, the small-signal transfer functions among control signals, output voltage and current imbalances are clearly derived. Finally, a 300-W three-phase bidirectional interleaved DC-DC converter prototype is built, and the control algorithm is implemented in a Field Programmable Gate Array (FPGA) chip. Eventually, the proposed current sharing control method and single current sensor sampling strategy is validated through some simulation and experimental results.