Surge snubber design for high power-density DC-DC converters in HVDC power distribution systems

Abstract

Abstract-In an isolated DC-DC converter utilized in the HVDC power distribution system, a large surge voltage occurs across the secondary-side diodes due to the transformer's leakage inductance, and then the diodes with a large withstand voltage are required. However, those diodes cause a lot of power loss. In this paper, a simple surge snubber with prominent surge suppression capability is examined, and the surge-voltage evaluation through the analysis using the high-frequency equivalent circuits, which is followed by the experimental confirmation. Furthermore, the the optimum design of its surgesnubber capacitor is presented.

Control characteristics improvement of full-bridge DC-DC converter with snubber capacitor

“…In order to control the output voltage, the output voltage variation has been experimentally confirmed by the influence of leakage inductance so far [10]. Here, the effect of the leakage inductance on the control characteristics improvement is investigated.…”

“…Therefore, the maximum value of I D0 utilizes as the initial value. In this case, the output voltage becomes as follows in approximately; (10) Figure. 6 shows the output voltage characteristics against the duty ratio.…”