Patent ID: 7154233

Claim:
A SEPIC converter circuit having two input branches, a switch (T 1 ) between the first input branch and the second input branch, a first inductance (L 1 ) in the first input branch on the input side of the connection of the switch (T 1 ), a capacitor (C 1 ) in the first input branch on the output side of the connection of the switch (T 1 ), a second inductance (L 2 ) between the first and the second input branches on the output side of the capacitor (C 1 ), a diode (D 1 ) in the first input branch on the output side of the connection of the second inductance (L 2 ), a second capacitor (C 2 ) between the first and the second input branches, in the case of which the first and the second inductances (L 1 , L 2 ) have a common core (K) with an air gap (S), and the second inductance (L 2 ) for ripple current compensation approximately corresponds to the inductance of a parallel circuit comprising the first and the second inductances (L 1 , L 2 ), characterized in that the air gap (S) is asymmetrical with respect to the winding in the first and the second inductances (L 1 , L 2 ) and lies to a greater extent in the region of the winding of the second inductance (L 2 ).