Multi-terminal fuse device

• US 6,456,186 B1
• Filed: 04/29/2000
• Issued: 09/24/2002
• Est. Priority Date: 10/27/1999
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Oglesbee, John Wendell
• Primary Examiner(s): Vortman, Anatoly
• Application Number:
  US09/562,265
• Time in Patent Office: 878 Days
• Field of Search: 337/161, 337/162, 337/159, 337/164, 337/180, 337/181, 337/283, 337/284, 337/285, 337/290, 337/293, 337/294, 337/297, 296/23, 361/104, 257/209, 257/529, 257/530, 438/467, 438/600, 438/601
• US Class Current: 337/161
• CPC Class Codes: H01H 85/12 Two or more separate fusible members in parallel
• CPC Class Codes: H01H 85/46 Circuit arrangements not adapted to a particular application of the protective device

Abstract

A fusing device with an adjustable current rating. The fusing device has a common conductive trace, a plurality of individual conductive traces, and a plurality of fusible links. Each fusible link electrically connects the common conductive trace with a corresponding individual conductive trace, and each fusible link has a current rating. The current ratings of the plurality of fusible links are substantially identical to each other or different. Each fusible link can have one or more fusible elements. The fusible elements can be coupled in parallel or in series. Optionally, at least one fusible element can be trimmed through an intermediate terminal. Fusible links can be disposed in a same surface of a substrate or in different surfaces of the substrate.

Claims

1. In combination, a fusing device comprising:

a. a common conductive trace;

b. a plurality of individual conductive traces; and

c. a plurality of fusible llinks, each fusible link electrically connecting the common conductive trace with a corresponding individual conductive trace, and each fusible link having a current rating; and

a connecting device, wherein the connecting device comprises;

a. an output terminal; and

b. a plurality of terminal pins, each terminal pin having a first end and a second end, wherein the first end of each terminal pin is electrically coupled to the output terminal, and the second end of at least one terminal pin is selectively connected to a corresponding second terminal, thereby to provide a current rating between the first terminal and the output terminal.

2. The fusing device of claim 1, wherein the connecting device further comprises a control circuit to selectively connect the second end of at least one terminal pin to a corresponding second terminal.

3. A fusing device comprising:

a. a common conductive trace;

b. a plurality of individual conductive traces; and

c. a plurality of fusible llinks, each fusible link electrically connecting the common conductive trace with a corresponding individual conductive trace, and each fusible link having a current rating;

wherein at least one fusible link comprises a first fuse element, a second fuse element and an intermediate terminal connecting the first fuse element and the second fuse element in series, the first fuse element being electrically coupled to the common conductive trace and the second fuse element being electrically coupled to the individual conductive trace connected to the at least one fusible link.

4. The fusing device of claim 3, wherein the first fuse element has a current rating and the second fuse element has a current rating.

5. The fusing device of claim 4, wherein the current ratings of the first fuse element and the second fuse element are substantially identical to each other.

6. The fusing device of claim 4, wherein the current ratings of the first fuse element and the second fuse element are different.

7. The fusing device of claim 3, wherein the intermediate terminal has a connection point to receive a testing current to trim at least one of the first and second fuse elements.

8. A fusing device comprising:

a. a common conductive trace;

b. a plurality of individual conductive traces;

c. a plurality of fusible links, each fusible link electrically connecting the common conductive trace with a corresponding individual conductive trace, and each fusible link having a current rating;

d. a first terminal electrically coupled to the common conductive trace;

e. a plurality of second terminals each electrically coupled to a corresponding individual conductive trace; and

f. a plurality of control elements, each being electrically coupled to a corresponding second terminal, electrically coupled in common to provide an output;

wherein at least two of the plurality of fusible links have different current ratings.

9. The fusing device of claim 8, wherein each fusible link has a width, and at least two of the plurality of fusible links have different widths.

10. The fusing device of claim 9, wherein the ratio of the current ratings of two neighboring fusible links is a non zero value.

11. The fusing device of claim 10, wherein the ratio of the current ratings of two neighboring fusible links substantially equals to 2 or 0.5.

12. A fusing device comprising:

a. a common conductive trace;

b. a plurality of individual conductive traces;

c. a plurality of fusible links, each fusible link electrically connecting the common conductive trace with a corresponding individual conductive trace, and each fusible link having a current rating;

d. a first terminal electrically coupled to the common conductive trace;

e. a plurality of second terminals each electrically coupled to a corresponding individual conductive trace; and

f. a plurality of control elements, each being electrically coupled to a corresponding second terminal, electrically coupled in common to provide an output;

wherein each control element comprises a transistor having a source, a gate and a train, the gate of each of the plurality of transistors being electrically coupled to a control port for receiving control signals, the source of each of the plurality of transistors being electrically coupled to a corresponding second terminal, and the drains of the plurality of transistors being electrically coupled in common to provide the output.

13. The fusing device of claim 12, wherein the current rating between the first terminal and the output is adjusted by turning on at least one selected transistor or more selected transistors from the control port.

14. A fusing device comprising:

a. a substrate having a first surface and a second surface;

b. at least one fusible link disposed on the first surface of the substrate;

c. at least one fusible link disposed on the second surface of the substrate;

d. a common conductive trace; and

e. a plurality of individual conductive traces;

wherein each fusible link has a current rating and electrically connects the common conductive trace with a corresponding individual conductive traces;

further wherein at least one fusible link comprises a first fuse element, a second fuse element and an intermediate terminal connecting the first fuse element and the second fuse element in series, the first fuse element being electrically coupled to the common conductive trace and the second fuse element being electrically coupled to the individual conductive trace connected to the at least one fusible link.

15. The fusing device of claim 14, wherein the first fuse element has a current rating and the second fuse element has a current rating.

16. The fusing device of claim 15, wherein the current ratings of the first fuse element and the second fuse element are different.

17. The fusing device of claim 15, wherein the current ratings of the first fuse element and the second fuse element are substantially identical to each other.

18. The fusing device of claim 14, wherein the intermediate terminal has a connection point to receive a testing current to trim at least one of the first and second fuse elements.