Air core coupled inductors

• US 10,020,109 B1
• Filed: 03/17/2014
• Issued: 07/10/2018
• Est. Priority Date: 02/28/2011
• Status: Active Grant

• Current Assignee: Volterra Semiconductor LLC (Analog Devices, Inc.)
• Original Assignee: Volterra Semiconductor LLC (Analog Devices, Inc.)
• Inventors: Ikriannikov, Alexandr
• Primary Examiner(s): Lian, Mangtin
• Assistant Examiner(s): Barnes, Malcolm
• Application Number:
  US14/215,969
• Time in Patent Office: 1,576 Days
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H02M 1/15 using active elements
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: H02M 3/1586 switched with a phase shift, i.e. interleaved

Abstract

A switching power converter includes a first and second switching device, an air core coupled inductor, and a controller. The air core coupled inductor includes a first winding electrically coupled to the first switching device and a second winding electrically coupled to the second switching device. The first and second windings are magnetically coupled. The controller is operable to cause the first and second switching devices to repeatedly switch between their conductive and non-conductive states at a frequency of at least 100 kilohertz to cause current through the first and second windings to repeatedly cycle, thereby providing power to an output port. The switching power converter may have a topology including, but not limited to, a buck converter topology, a boost converter topology, and a buck-boost converter topology.

Claims

1. An air core coupled inductor, comprising first and second wires each having respective opposing ends, the first and second wires at least partially joined together and wound around a straight axis extending in a first direction to form a loop having an outer edge as seen when the air core coupled inductor is viewed in the first direction, the first and second wires forming at least first and second offset cross sectional areas where the first and second wires are not joined together and are spaced apart, the first wire forming the outer edge of the loop in the first offset cross sectional area as seen when the air core coupled inductor is viewed in the first direction, the second wire forming the outer edge of the loop in the second offset cross sectional area as seen when the air core coupled inductor is viewed in the first direction, the first and second offset cross sectional areas being non-overlapping as seen when the air core coupled inductor is viewed in the first direction.

2. The air core coupled inductor of claim 1, the first and second wires collectively forming at least two loops.

3. The air core coupled inductor of claim 1, the first and second offset cross sectional areas being collectively less than a common cross sectional area enclosed by the loop and outside of the first and second offset cross sectional areas, as seen when the air core coupled inductor is viewed in the first direction.