Applying Coupled Inductors to the Clamped-Resonant Interleaved Boost Converter

This paper investigates the possibility to use coupled inductors in the DC-DC converter topology called Clamped-Resonant Interleaved Boost converter (CRIB). Such topology employs a resonant L-C tank connected between the switch drain terminals to achieve zero-voltage turn-on and turn-off of both switches, as well as zero-current turn-off for the rectifier diodes, independently of the load current. Moreover, no-load operation is demonstrated providing the voltage gain is higher than a minimum value. The converter analysis and proposed design criteria were verified by an experimental prototype rated at 42 - 54 V to 400 V - 300 W, showing a very good efficiency in the whole input voltage range. Performance comparison with the same topology adopting separated input inductors is included as well.