ISOLATED POWER CONVERTER

• US 20080224812A1
• Filed: 03/14/2007
• Published: 09/18/2008
• Est. Priority Date: 03/14/2007
• Status: Active Grant

• Current Assignee: Flextronics International USA Incorporated (Flex, Ltd.)
• Original Assignee: ColdWatt, Inc. (Flex, Ltd.)
• Inventors: Chandrasekaran, Sriram
• Granted Patent: US 7,468,649 B2
• Time in Patent Office: Days
• US Class Current: 336/212
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 27/40 Structural association with built-in electric component, e.g. fuse
• CPC Class Codes: H01F 3/14 Constrictions; Gaps, e.g. air-gaps in magnetic shunt paths H01F3/12
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

There is provided an isolated power converter. More particularly, in one embodiment, there is provided a power converter including a first magnetic core having a primary winding and a secondary winding around the first magnetic core. The power converter also includes a second magnetic core having a first leg, a second leg coupled to the first leg, and a third leg coupled to the first and second legs, wherein a part of the third leg is equidistant from the first leg and the second leg. The power converter also has a first winding encircling the first leg, a first end of the first winding coupled to the secondary winding, a second winding encircling the second leg, a first end of the second winding coupled to the secondary winding, and a third winding encircling the third leg, a first end of the third winding coupled to a second end of the first wining and to a second end of the second winding.

Claims

1. A power converter comprising:

a first magnetic core having a primary winding and a secondary winding around the first magnetic core;

a second magnetic core comprising;

a first leg;

a second leg coupled to the first leg; and

a third leg coupled to the first and second legs, wherein a part of the third leg is equidistant from the first leg and the second leg;

a first winding encircling the first leg, a first end of the first winding coupled to the secondary winding;

a second winding encircling the second leg, a first end of the second winding coupled to the secondary winding; and

a third winding encircling the third leg, a first end of the third winding coupled to a second end of the first winding and to a second end of the second winding.

2. The power converter of claim 1, comprising a capacitor coupled to a second end of the third winding.

3. The power converter of claim 1, wherein the second magnetic core comprises a fourth leg coupled to the first and second legs, wherein the part of the third leg is equidistant from the first, second, and fourth legs.

4. The power converter of claim 3, comprising a fourth winding encircling the fourth leg, wherein a first end of the fourth winding is coupled to the secondary winding and a second end of the fourth winding coupled to the third winding.

5. The power converter of claim 1, wherein the power converter comprises an AC/DC converter.

6. The power converter of claim 1, comprising an AC source coupled to the primary winding.

7. The power converter of claim 6, wherein the AC source is configured to generate a quasi-square wave AC on the primary winding.

8. The power converter of claim 6, wherein the AC source comprises a full bridge converter.

9. The power converter of claim 6, wherein the AC source is configured to generate two AC signals out-of-phase from each other.

10. The power converter of claim 1, comprising:

a first rectification component coupled to the first end of the first winding; and

a second rectification component coupled to the first end of second winding.

11. The power converter of claim 10, wherein the first rectification component comprises a MOSFET switch.

12-20. -20. (canceled)