Method and apparatus for mounting printed circuit board components

• US 6,498,708 B2
• Filed: 05/27/1999
• Issued: 12/24/2002
• Est. Priority Date: 05/27/1999
• Status: Expired due to Term

• Current Assignee: ASCO Power Technologies LP (Schneider Electric SE)
• Original Assignee: Emerson Electric Company
• Inventors: Wilson, Glenn, Cole, Bryan, Schilloff, Walter, Bigelow, Scot
• Primary Examiner(s): Sircus, Brian
• Assistant Examiner(s): RIOS CUEVAS, ROBERTO JOSE
• Application Number:
  US09/321,324
• Publication Number:
  US 20020001161A1
• Time in Patent Office: 1,307 Days
• Field of Search: 361/58, 361/760, 361/761, 361/777, 361/743, 361/719, 361/720, 361/748, 174/260, 174/262, 174/263, 174/52.4, 174/250, 174/255, 174/261, 174/264, 174/265, 174/266, 174/267
• US Class Current: 361/58
• CPC Class Codes: H05K 1/0254 High voltage adaptations; Electrical insulation details; Overvoltage or electrostatic discharge protection electrostatic discharge protection for electric apparatus in general H05K9/0067, H05K9/0079; Arrangements for regulating voltages or for using plural voltages
• CPC Class Codes: H05K 1/18 Printed circuits structurally associated with non-printed electric components H05K1/0201, H05K1/023, H05K1/0243, and H05K1/16 take precedence
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 2201/09072 Hole or recess under component or special relationship between hole and component
• CPC Class Codes: H05K 2201/10022 Non-printed resistor

Abstract

A method and apparatus for mounting heat generating components on a printed circuit board. Components mounted on the printed circuit board that generate heat may alter the properties of the printed circuit board and allow the printed circuit board to conduct current. To stop the flow of current in the printed circuit board, a slot may be used between the mounting points of the component. The slot prevents current from flowing within the printed circuit board.

Claims

1. A printed circuit board assembly, which comprises:

a) a mounting board, said mounting board having a top surface and a bottom surface;

b) said mounting board having at least two mounting points for receiving an electrical component; and

c) said mounting board having a slot between said at least two mounting points, said slot extending from the top surface of said mounting board to the bottom surface of said mounting board and having a length greater than a width of said electrical component and a width less than a length of said electrical component, said slot preventing current from passing through said mounting board between each of said at least two mounting points due to a heat-induced change of the properties of the mounting board.

2. The printed circuit board assembly of claim 1, further comprising of an electrical component, said electrical component attached to said at least two mounting points of said mounting board.

3. The printed circuit board assembly of claim 2, wherein said electrical component is a through-hole component.

4. The printed circuit board assembly of claim 2, wherein said electrical component is a surface mounted component.

5. The printed circuit board assembly of claim 2, wherein said electrical component is a Metal Oxide Varistor.

6. The printed circuit board assembly of claim 1, wherein said non-conductive slot is at least 0.25 inch wide.

7. The printed circuit board assembly of claim 1, wherein said non-conductive slot is rectangular in shape.

8. The printed circuit board assembly of claim 1, wherein said non-conductive slot is elliptical in shape.

9. The printed circuit board assembly of claim 1 wherein said slot extends at least 0.25 inches on either side of said mounting component.

10. A printed circuit board assembly, which comprises:

a) a mounting board, said mounting board having a top surface and a bottom surface;

b) an electrical component that radiates heat to the top surface of said mounting board;

c) a means for attaching said electrical component to said mounting board at least two mounting points; and

d) a means for preventing current from passing through said mounting board between each of said mounting points due to a heat-induced change of the electrical properties of the mounting board.

11. The printed circuit board assembly of claim 10, wherein said electrical component is a Metal Oxide Varistor.

12. The printed circuit board assembly of claim 10, wherein said electrical component is a surface mounted component.

13. The printed circuit board assembly of claim 10, wherein said electrical component is a through-hole component.

14. A printed circuit board comprising:

at least two mounting points for connecting an electrical component to the circuit board; and

a slot between the mounting points having a length greater than the width of the electrical component and a width less than the length of the electrical component, the slot preventing current from passing between the mounting points through the printed circuit board due to a heat-induced change of the electrical properties of the printed circuit board.

15. The printed circuit board of claim 14, wherein the electrical component is a through-hole component.

16. The printed circuit board of claim 14, wherein the electrical component is a surface mounted component.

17. The printed circuit board of claim 14, wherein the electrical component is a metal oxide varistor.

18. The printed circuit board of claim 14, wherein the slot is at least 0.25 inch wide.

19. The printed circuit board of claim 14, wherein the slot extends at least 0.25 inch past the electrical component on either side.

20. The printed circuit board of claim 14, wherein the slot is rectangular in shape.

21. The printed circuit board of claim 14 wherein the slot is elliptical in shape.

22. A method of preventing current flow between two mounting points on a printed circuit board due to heating of a printed circuit board, the method comprising providing a slot between the mounting points, the slot having a length greater than a width of an electrical component to be attached to the mounting points and a width less than the length of the electrical component.

23. The method of claim 22 wherein the slot has a width of at least 0.25 inch.

24. The method of claim 22 wherein the slot has a length that extends at least 0.25 inch past the electrical component on either side.

25. The method of claim 22 wherein the slot is rectangular in shape.

26. The method of claim 22 wherein the slot is elliptical in shape.