High current electrical switch and method

• US 7,522,405 B2
• Filed: 05/23/2005
• Issued: 04/21/2009
• Est. Priority Date: 05/23/2005
• Status: Active Grant

• Current Assignee: Perfect Switch, LLC
• Original Assignee: Perfect Switch, LLC
• Inventors: Fogleman, H. Frank
• Primary Examiner(s): Parker; Kenneth A
• Assistant Examiner(s): NGUYEN, JOSEPH H
• Application Number:
  US11/135,232
• Publication Number:
  US 20060261368A1
• Time in Patent Office: 1,429 Days
• Field of Search: 257/202, 257/203, 257/341, 257/107, 257/736, 174/260, 174/252, 218/69, 361/601
• US Class Current: 361/601
• CPC Class Codes: H01L 25/115 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H03K 17/122 in field-effect transistor switches
• CPC Class Codes: H03K 17/6871 the output circuit comprising more than one controlled field-effect transistor

Abstract

A method and system are disclosed for a high current electrical switch. The switch may be suitable for switching, rectifying or blocking direct current in the range of one to a thousand amperes per module or assembly. It does so with such high efficiency that it produces relatively insignificant heat; such that it requires little or no cooling by convection or radiation. The relatively low heat that is generated in the process is conducted away quite effectively by the electric cables connected to the device.

Claims

1. A high current electrical switch, comprising:

a first primary conductor having a first flat surface;

a second primary conductor having a second flat surface;

the first and second surfaces each having substantially the same width;

an array of two or more switching elements electrically connecting the first primary conductor to the second primary conductor and physically sandwiched between the first primary conductor and the second primary conductor and mounted on and extending between the first and second flat surfaces thereof;

the array having substantially the same width as the flat surfaces; and

a printed circuit board permanently fixed substantially around the array of switching elements and mounted at least partially between the primary conductors to form a package;

wherein the printed circuit board includes an opening for receiving the array; and

wherein the electrical switch including the first and second primary conductors has a resistance of less than about 500 micro-ohms.

2. The switch of claim 1, wherein each of the conductors has an effective resistance of less than 20 micro-ohms.

3. The switch of claim 1, wherein the printed circuit board includes a circuit to control the switching elements.

4. The switch of claim 1, wherein the switching elements are MOSFETs.

5. The switch of claim 4, wherein a drain lead of each MOSFET connects directly to the first primary conductor.

6. The switch of claim 4, wherein a source lead of each MOSFET connects directly to the second primary conductor.

7. The switch of claim 4, wherein a gate lead of each MOSFET connects directly to the printed circuit board.

8. The switch of claim 7, wherein a source lead of the MOSFET connects to the second primary conductor via a metal strip.

9. The switch of claim 8, wherein the metal strip includes tabs extending to the source leads of the MOSFET.

10. A high current electrical switch, comprising:

a first primary conductor having a first flat surface;

a second primary conductor having a second flat surface;

the first and second surfaces each having substantially the same width;

an array of at least two switching elements electrically connecting the first primary conductor to the second primary conductor and sandwiched between the first primary conductor and the second primary conductor and mounted on and extending between the first and second flat surfaces thereof;

the array having substantially the same width as the flat surfaces; and

a printed circuit board permanently fixed substantially around the array of switching elements and mounted at least partially between the primary conductors to form a package;

wherein the printed circuit board includes an opening for receiving the array; and

wherein each of the conductors has an effective length to cross-sectional area ratio of less than about 40.

11. The switch of claim 10, wherein each of the conductors has an effective resistance of less than 20 micro-ohms.

12. The switch of claim 10, wherein the printed circuit board includes a circuit to control the switching elements.

13. The switch of claim 10, wherein the switching elements are MOSFETs.

14. The switch of claim 13, wherein a drain lead of each MOSFET connects directly to the first primary conductor.

15. The switch of claim 13, wherein a source lead of each MOSFET connects directly to the second primary conductor.

16. The switch of claim 13, wherein a gate lead of each MOSFET connects directly to the printed circuit board.

17. The switch of claim 16, wherein a source lead of the MOSFET connects to the second primary conductor via a metal strip.

18. The switch of claim 17, wherein the metal strip includes tabs extending to the source leads of the MOSFET.