Two-phase coupled inductors which promote improved printed circuit board layout

• US 8,174,348 B2
• Filed: 05/24/2010
• Issued: 05/08/2012
• Est. Priority Date: 12/21/2009
• Status: Active Grant

• Current Assignee: Volterra Semiconductor Corporation (Analog Devices, Inc.)
• Original Assignee: Volterra Semiconductor Corporation (Analog Devices, Inc.)
• Inventors: Ikriannikov, Alexandr
• Primary Examiner(s): Mai, Anh
• Application Number:
  US12/786,316
• Publication Number:
  US 20110148560A1
• Time in Patent Office: 715 Days
• Field of Search: 336/200, 336/223, 336/83, 336/192
• US Class Current: 336/192
• CPC Class Codes: H01F 17/06 with core substantially closed in itself, e.g. toroid
• CPC Class Codes: H01F 27/2847 Sheets; Strips H01F27/2866 takes precedence
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• CPC Class Codes: H02M 3/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H02M 3/1584 with a plurality of power processing stages connected in parallel
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections

Abstract

Two-phase coupled inductors including a magnetic core, at least a first winding, and at least three solder tabs. Power supplies including a printed circuit board, a two-phase coupled inductor affixed to the printed circuit board, and first and second switching circuits affixed to the printed circuit board. Each of the first and second switching circuits are electrically coupled to a respective solder tab of the two-phase coupled inductor affixed to the printed circuit board.

Claims

1. A two-phase coupled inductor, comprising:

a magnetic core including a first side and a second side opposite the first side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by a first leg of the magnetic core;

a first winding wound at least partially around the first leg and through the passageway, a first end of the first winding extending from the first side of the core and forming a first solder tab, a second end of the first winding extending from the second side of the core and forming a second solder tab; and

a second winding wound at least partially around the first leg and through the passageway, a first end of the second winding extending from the second side of the core and forming a third solder tab, a second end of the second winding extending from the first side of the core and forming a fourth solder tab;

the first, second, third, and fourth solder tabs being separated from each other along a width of the magnetic core;

wherein an electric current flowing through the first winding from the first solder tab to the second solder tab induces an electric current in the second winding flowing from the third solder tab to the fourth solder tab.

2. The two-phase coupled inductor of claim 1, the first, second, third, and fourth solder tabs being at least partially laterally adjacent to each other along the width of the magnetic core.

3. The two-phase coupled inductor of claim 1, the third solder tab being disposed between the second and fourth solder tabs along the width of the magnetic core.

4. The two-phase coupled inductor of claim 1, the fourth solder tab being disposed between the second and third solder tabs along the width of the magnetic core.

5. A two-phase coupled inductor, comprising:

a magnetic core including a first side and a second side opposite the first side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by a first leg of the magnetic core; and

a first winding forming at least two turns around the first leg and wound through the passageway, a first end of the first winding extending from the first side of the core and forming a first solder tab along a bottom surface of the coupled inductor, a second end of the first winding extending from the second side of the core and forming a second solder tab along the bottom surface of the coupled inductor, and an intermediate portion of the first winding between the first and second ends of the first winding forming a third solder tab along the bottom surface of the coupled inductor;

the first, second, and third solder tabs being separated from each other along a width of the magnetic core;

wherein an electric current flowing through the first winding from the first solder tab to the third solder tab induces an electric current in the first winding flowing from the second solder tab to the third solder tab.

6. A two-phase coupled inductor, comprising:

a magnetic core including a first side opposite a second side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by a first leg of the magnetic core;

a first winding wound at least partially around the first leg and through the passageway, a first end of the first winding extending from the first side of the core and forming a first solder tab, a second end of the first winding extending from the second side of the core and forming a second solder tab; and

a second winding wound at least partially around the first leg and through the passageway, a first end of the second winding extending from the first side of the core and forming a third solder tab, a second end of the second winding extending from the second side of the core and forming a fourth solder tab;

wherein the first winding crosses the second winding within the passageway.

7. A two-phase coupled inductor, comprising:

a magnetic core including a first side opposite a second side, a third side opposite a fourth side, and a fifth side opposite a sixth side, the fifth side connecting the first side to the third side and forming an obtuse angle with the first side and an obtuse angle with the third side, the sixth side connecting the second side to the fourth side and forming an obtuse angle with the second side and an obtuse angle with the fourth side, the magnetic core forming a passageway extending through the core from the fifth side to the sixth side, the passageway partially defined by a first leg of the magnetic core;

a first winding wound at least partially around the first leg and through the passageway, a first end of the first winding extending from the fifth side of the core and forming a first solder tab, a second end of the first winding extending from the sixth side of the core and forming a second solder tab; and

a second winding wound at least partially around the first leg and through the passageway, a first end of the second winding extending from the fifth side of the core and forming a third solder tab, a second end of the second winding extending from the sixth side of the core and forming a fourth solder tab.

8. A two-phase coupled inductor, comprising:

a magnetic core including a first side opposite a second side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by first and second opposing surfaces, the magnetic core including a first leg connecting the first and second surfaces within the passageway;

a first winding wound at least partially around the first leg, a first end of the first winding extending from the first side of the core and forming a first solder tab, a second end of the first winding extending from the first side of the core and forming a second solder tab; and

a second winding wound at least partially around the first leg, a first end of the second winding extending from the second side of the core and forming a third solder tab, a second end of the second winding extending from the second side of the core and forming a fourth solder tab.

9. The two-phase coupled inductor of claim 8, the first winding extending through the passageway from the first side to the second side of the core, the second winding extending through the passageway from the second side to the first side of the core.

10. A power supply, comprising:

a printed circuit board;

a two-phase coupled inductor affixed to the printed circuit board, the two-phase coupled inductor including;

a magnetic core including a first side and a second side opposite the first side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by a first leg of the magnetic core;

a first winding wound at least partially around the first leg and through the passageway, a first end of the first winding extending from the first side of the core and forming a first solder tab, a second end of the first winding extending from the second side of the core and forming a second solder tab, and

a second winding wound at least partially around the first leg and through the passageway, a first end of the second winding extending from the second side of the core and forming a third solder tab, a second end of the second winding extending from the first side of the core and forming a fourth solder tab,

the first, second, third, and fourth solder tabs being separated from each other along the width of the magnetic core,

wherein an electric current flowing through the first winding from the first solder tab to the second solder tab induces an electric current flowing through the second winding from the third solder tab to the fourth solder tab;

a first switching circuit affixed to the printed circuit board and electrically coupled to the first solder tab, the first switching circuit configured to switch the first solder tab between at least two different voltage levels;

a second switching circuit affixed to the printed circuit board and electrically coupled to the third solder tab, the second switching circuit configured to switch the third solder tab between at least two different voltage levels; and

a conductive trace affixed to the printed circuit and electrically coupling together the second and fourth solder tabs.

11. The power supply of claim 10, the first and second switching circuits being disposed along the second side of the magnetic core.

12. The power supply of claim 11, each of the first and second switching circuits configured to switch at a frequency of at least 20 kilohertz, and the magnetic core being formed of a material selected from the group consisting of a ferrite material and a powdered iron material.

13. The power supply of claim 10, the fourth solder tab being disposed between the second and third solder tabs along the width of the magnetic core.

14. The power supply of claim 13, the conductive trace electrically coupled to an output node of the power supply.

15. A power supply, comprising:

a printed circuit board;

a two-phase coupled inductor affixed to the printed circuit board, the two-phase coupled inductor including;

a magnetic core including a first side and a second side opposite the first side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by a first leg of the magnetic core, and

a first winding forming at least two turns and wound around the first leg and through the passageway, a first end of the first winding extending from the first side of the core and forming a first solder tab along a bottom surface of the coupled inductor, a second end of the first winding extending from the second side of the core and forming a second solder tab along the bottom surface of the coupled inductor, and an intermediate portion of the first winding between the first and second ends of the first winding forming a third solder tab along the bottom surface of the coupled inductor,

the first, second, and third solder tabs being separated from each other along a width of the magnetic core,

wherein an electric current flowing through the first winding from the first solder tab to the third solder tab induces an electric current in the first winding flowing from the second solder tab to the third solder tab;

a first switching circuit affixed to the printed circuit board and electrically coupled to the first solder tab, the first switching circuit configured to switch the first solder tab between at least two different voltage levels;

a second switching circuit affixed to the printed circuit board and electrically coupled to the second solder tab, the second switching circuit configured to switch the second solder tab between at least two different voltage levels; and

a conductive trace affixed to the printed circuit and electrically coupled to the third tab and extending from the first side of the magnetic core.

16. The power supply of claim 15, each of the first and second switching circuits being disposed along the second side of the magnetic core.

17. The power supply of claim 16, each of the first and second switching circuits configured to switch at a frequency of at least 20 kilohertz, and the magnetic core being formed of a material selected from the group consisting of a ferrite material and a powdered iron material.

18. A power supply, comprising:

a printed circuit board;

a two-phase coupled inductor affixed to the printed circuit board, the two-phase coupled inductor including;

a magnetic core including a first side opposite a second side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by a first leg of the magnetic core,

a first winding wound at least partially around the first leg and through the passageway, a first end of the first winding extending from the first side of the core and forming a first solder tab, a second end of the first winding extending from the second side of the core and forming a second solder tab, and

a second winding wound at least partially around the first leg and through the passageway, a first end of the second winding extending from the first side of the core and forming a third solder tab, a second end of the second winding extending from the second side of the core and forming a fourth solder tab,

wherein the first winding crosses the second winding within the passageway;

a first switching circuit affixed to the printed circuit board and electrically coupled to the first solder tab, the first switching circuit configured to switch the first solder tab between at least two different voltage levels;

a second switching circuit affixed to the printed circuit board and electrically coupled to the third solder tab, the second switching circuit configured to switch the third solder tab between at least two different voltage levels; and

a conductive trace affixed to the printed circuit and electrically coupling together the second and fourth solder tabs.

19. The power supply of claim 18 each of the first and second switching circuits being disposed along the first side of the magnetic core.

20. The power supply of claim 19, each of the first and second switching circuits configured to switch at a frequency of at least 20 kilohertz, and the magnetic core being formed of a material selected from the group consisting of a ferrite material and a powdered iron material.

21. A power supply, comprising:

a printed circuit board;

a two-phase coupled inductor affixed to the printed circuit board, the two-phase coupled inductor comprising;

a magnetic core including a first side opposite a second side, a third side opposite a fourth side, and a fifth side opposite a sixth side, the fifth side connecting first side to the third side and forming an obtuse angle with the first side and an obtuse angle with the third side, the sixth side connecting the second side to the fourth side and forming an obtuse angle with the second side and an obtuse angle with the fourth side, the magnetic core forming a passageway extending through the core from the fifth side to the sixth side, the passageway partially defined by a first leg of the magnetic core,

a first winding wound at least partially around the first leg and through the passageway, a first end of the first winding extending from the fifth side of the core and forming a first solder tab, a second end of the first winding extending from the sixth side of the core and forming a second solder tab, and

a second winding wound at least partially around the first leg and through the passageway, a first end of the second winding extending from the fifth side of the core and forming a third solder tab, a second end of the second winding extending from the sixth side of the core and forming a fourth solder tab;

a first switching circuit affixed to the printed circuit board and electrically coupled to the second solder tab, the first switching circuit configured to switch the second solder tab between at least two different voltage levels;

a second switching circuit affixed to the printed circuit board and electrically coupled to the third solder tab, the second switching circuit configured to switch the third solder tab between at least two different voltage levels; and

a conductive trace affixed to the printed circuit and electrically coupling together the first and fourth solder tabs.

22. The power supply of claim 21, the first switching circuit being disposed along the first side of the magnetic core, and the second switching circuit being disposed along the fifth side of the magnetic core.

23. The power supply of claim 22, each of the first and second switching circuits configured to switch at a frequency of at least 20 kilohertz, and the magnetic core being formed of a material selected from the group consisting of a ferrite material and a powdered iron material.

24. A power supply, comprising:

a printed circuit board;

a two-phase coupled inductor affixed to the printed circuit board, the two-phase coupled inductor comprising;

a magnetic core having a first side opposite a second side, the magnetic core forming a passageway extending through the core from the first side to the second side, the passageway partially defined by first and second opposing surfaces, the magnetic core including a first leg connecting the first and second surfaces within the passageway;

a first winding wound at least partially around the first leg, a first end of the first winding extending from the first side of the core and forming a first solder tab, a second end of the first winding extending from the first side of the core and forming a second solder tab, and

a second winding wound at least partially around the first leg, a first end of the second winding extending from the second side of the core and forming a third solder tab, a second end of the second winding extending from the second side of the core and forming a fourth solder tab;

a first switching circuit affixed to the printed circuit board and electrically coupled to the first solder tab, the first switching circuit configured to switch the first solder tab between at least two different voltage levels;

a second switching circuit affixed to the printed circuit board and electrically coupled to the third solder tab, the second switching circuit configured to switch the third solder tab between at least two different voltage levels; and

a conductive trace affixed to the printed circuit and electrically coupling together the second and fourth solder tabs.

25. The power supply of claim 24, each of the first and second switching circuits being disposed along a third side of the magnetic core.

26. The power supply of claim 25, each of the first and second switching circuits configured to switch at a frequency of at least 20 kilohertz, and the magnetic core being formed of a material selected from the group consisting of a ferrite material and a powdered iron material.