| Abstract |
This paper deals with a single phase current-fed full bridge converter with full bridge rectifier. An additional buck converter is used for the clamp circuit. In this way, the clamp voltage can be controlled to an arbitrary value. By a detailed analysis in closed form equations the operating behavior of the dc-dc converter over the full power range can be described. From this analysis three operating modes are identified: discontinuous operating mode (DCM), continuous operating mode (CCM) and buck mode (BM). A boost behavior is received, when operating the converter in DCM and CCM. Operating the converter in BM leads to a buck behavior. Based on the analysis, the impact of the transformer’s winding ratio, its leakage inductance and dimension of input inductor on the converter’s efficiency is emphasized. Out of this, a design procedure is proposed to maximize the converter’s efficiency. Experimental results, taken from a 1:2kW prototype, are shown and compared to the analytical results. |
