Non-inverting buck–boost converter with interleaved technique for fuel-cell system

This study presents a non-inverting buck–boost converter with an interleaved technique for fuel-cell systems. The converter transforms the fuel-cell energy into an electric current for efficiently running electric mobility systems. Two non-inverting buck–boost converters are integrated with an interleaved operation. Thus, a switch and a diode can be omitted, reducing cost. The interleaved operation reduces both the current ripple at the output and the current stress of the diodes. The operating principles and steady-state analysis are discussed in detail. An 800 W prototype circuit of the proposed converter that converts an input source (fuel-cell battery 24–45 V) into an output voltage (28 V) is built to verify performance. The synchronous rectifier technique is adopted to increase efficiency. Power loss and efficiency are also discussed.