DC-DC converter

A DC to DC converter connected to first positive and negative power lines and second positive and negative power lines for transferring a DC voltage between the first positive and negative power lines and the second positive and negative power lines, said DC to DC converter comprising:

• a magnetic circuit having a first primary winding, a second primary winding, a third primary winding, a fourth primary winding, a first secondary winding, and a second secondary winding, said first and second primary windings being magnetically coupled to the first secondary winding, said third and fourth primary windings being magnetically coupled to the second secondary winding, said first and third primary windings being coupled in series to form a first coil member, said second and fourth primary winding being coupled in series to form a second coil member, one end of said first coil member being coupled to the first positive power line;
• a first capacitor coupled between the first negative power line and one end of the second coil member;
• and
• a first switching element coupled between the first negative power line and a connecting point at which the other end of the first coil member and the other end of the second coil member are connected to each other.