SWITCHING CONVERTER CIRCUIT WITH AN INTEGRATED TRANSFORMER
A switching converter circuit has an integrated transformer, wherein the transformer has a double loop magnetic structure with an E I core geometry, wherein the primary and secondary windings are placed side by side on the center leg of the E-part of the core, wherein the air gap is placed at the far end of the primary winding between the free end of the center leg and the I-part of the core.
1 . A switching converter circuit, comprising:
an integrated transformer,
wherein the transformer includes a double loop magnetic structure having an E I core geometry, a primary winding, a secondary winding, a center leg, a core, an air gap, an E-part, and an I-part,
wherein the primary and secondary windings are arranged side by side on the center leg of the E-part of the core,
wherein the air gap is arranged at a far end of the primary winding between a free end of the center leg and the I-part of the core.
2 . A switching converter circuit, comprising:
a double loop core including a magnetic material, and further including a first single loop and a second single loop, the loops including magnetic material, combined to form a frame-like structure sharing one center leg common to both of the loops, only one air gap being positioned between a free end of the center leg and the frame-like structure;
a primary winding; and
a secondary winding,
wherein the primary and secondary windings are coupled by a winding of the primary and secondary windings on the center leg.
3 . The circuit of claim 2 , wherein the primary winding is wound on the center leg in a section close to the air gap.
4 . The circuit of claim 3 , wherein the secondary winding is wound on the center leg in a section at a far end from the air gap.
5 . The circuit of claim 4 , wherein the primary winding is wound on the center leg between the air gap and the secondary winding.
6 . The circuit of claim 1 , wherein the center leg has a round cross-sectional contour.
7 . The circuit of claim 2 , wherein the center leg has a round cross-sectional contour.
8 . The circuit of claim 1 , wherein the center leg has a rectangular or a quadratic cross-sectional contour.
9 . The circuit of claim 2 , wherein the center leg has a rectangular or a quadratic cross-sectional contour.
10 . The circuit of claim 1 , wherein the core includes a ferritic material.
11 . The circuit of claim 1 , wherein the core is made of a ferritic material.
12 . The circuit of claim 2 , wherein the core includes a ferritic material.
13 . The circuit of claim 2 , wherein the core is made of a ferritic material.
14 . The circuit of claim 1 , wherein the core is made of a laminated metal sheet arrangement.
15 . The circuit of claim 1 , wherein a diameter or geometrical outline dimension of the center leg of the core is larger than a width of the air gap.
16 . The circuit of claim 15 , wherein the diameter or geometrical outline dimension of the center leg of the core is larger than five times the width of the air gap.
17 . The circuit of claim 1 , wherein a length of the center leg is larger than a width of the air gap.
18 . The converter of claim 17 , wherein the length of the center leg is larger than five times the width of the air gap.