The average switch model of a new double-input DC/DC boost converter for hybrid fuel-cell vehicles

A refined model of a new conversion structure for the bi-directional interfacing of two dc voltage sources with a higher voltage dc-link is presented, where only three controllable power electronic switches are needed and where the only limit is that the sum of the two dc voltages must be lower or equal than the motor drive dc-link voltage. The developed model, which has been based on the averaged switch modeling theory, allows the evaluation of the conduction power losses, while preserving the converter dynamic behavior. The analytical development and some test results, that confirm the validity of the proposed approach, are shown.