DC-DC converters

A DC--DC converter comprising:

• a transformer having a primary winding and a tapped secondary winding, wherein said tapped secondary winding has a first terminal, a second terminal, and a tap terminal;
• an output filter comprising a filter inductor and a filter capacitor connected in series, wherein one side of said output filter is connected to the tap terminal of the secondary winding;
• a first unidirectional device and a second unidirectional device connected in series with each other and with opposite polarities, there being a common node between them, said first unidirectional device electrically coupled to the first terminal of the secondary winding, said second unidirectional device electrically coupled to the second terminal of the secondary winding, and said output filter electrically coupled to the common node;
• a first switch connected in series with the primary winding;
• and
• a clamping circuit connected between two of the first, second, and tap terminals of the secondary winding, said clamping circuit comprising a clamping capacitor and a second switch connected in series.