Electrolytic capacitor with multiple independent anodes

• US 5,930,109 A
• Filed: 11/07/1997
• Issued: 07/27/1999
• Est. Priority Date: 11/07/1997
• Status: Expired due to Term

• Current Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Inventors: Fishler, Matthew G.
• Primary Examiner(s): Kincaid, Kristine
• Assistant Examiner(s): Dinkins, Anthony
• Application Number:
  US08/965,915
• Time in Patent Office: 627 Days
• Field of Search: 361/302, 361/303, 361/301.3, 361/301.4, 361/508, 361/504, 361/511, 361/512, 361/516, 361/517, 361/520, 361/523, 361/522, 361/524, 361/528, 361/530, 361/531, 361/532 , 361/535, 361/537, 361/538, 361/541, 29/25.03, 602/5, 602/4, 602/16, 602/36, 216/6
• US Class Current: 361/508
• CPC Class Codes: H01G 9/04 Electrodes or formation of dielectric layers thereon

Abstract

An electrolytic capacitor having several cathode layers and several anode layers stacked in a single housing. At least some of the anode layers are electrically interconnected in a group electrically isolated from another group of electrically interconnected anodes. Separate electrical connections permit the separate groups to be independently connected to external circuitry.

Claims

1. An electrolytic capacitor comprising:

a housing;

a plurality of charge storing layers within the housing;

each layer including at least a conductive anode layer, and a conductive cathode layer, the anode and cathode layers being electrically separate from each other and overlaying each other;

a first anode of a first one of the charge storing layers being connected to a first electrical feed through on the housing; and

a second anode of a different one of the charge storing layers being connected to a second electrical feed through on the housing electrically separate from the first feed through.

2. The capacitor of claim 1 comprising at least a third anode electrically separate from the first and second anodes and connected to at least a third feed through.

3. The capacitor of claim 1 wherein the cathodes of each charge storing layer are electrically connected to each other.

4. The capacitor of claim 1 wherein the cathodes of at least one of the charge storing layers are electrically isolated from the cathodes of at least another of the charge storing layers.

5. The capacitor of claim 1 wherein the charge storing layers are arranged in at least two distinct groups, each group comprising a plurality of said anodes, and wherein the anodes are interconnected within each group, and isolated from the anodes of the other group.

6. The capacitor of claim 5 wherein each of said groups includes a plurality of cathodes which are interconnected within the group, and isolated from the cathodes of the other group, such that the cathodes of one group may be connected to the anodes of another group outside of the housing, providing a serially connected arrangement.

7. The capacitor of claim 6 wherein the groups are stacked laminarly so that an end cathode of one of said groups is spaced apart from and adjacent to an end cathode from another of said groups by a single separator sheet of insulator material.

8. The capacitor of claim 5 wherein the groups are stacked laminarly so that an end anode of one of said groups is spaced apart from an adjacent end anode from another of said groups.

9. The capacitor of claim 5 wherein there are more anode layers in one of said groups than in another of said groups.

10. The capacitor of claim 7 including a plurality of separator layers, each position between one of said anode layers and an adjacent one of said cathode layers.

11. An electrolytic capacitor comprising:

a housing;

a plurality of charge storing elements within the housing;

at least a first and second of the elements each having an anode connection connected to at least an anode sheet and a separate cathode connection connected to at least a cathode sheet; and

at least one of the anode and cathode connections of the first element being electrically isolated from the corresponding anode and cathode connections, respectively, of the second element, such that the elements are at least partially independent.

12. The capacitor of claim 11 wherein each element includes a plurality of stacked planar conductive layers, and wherein the elements are overlaid in a laminar arrangement.

13. The capacitor of claim 11 wherein the cathode connections of the first and second elements are electrically isolated and the anode connections of the first and second elements are electrically isolated, such that the first and second elements are fully independent.

14. The capacitor of claim 11 including three elements that are at least partially independent.

15. The capacitor of claim 11 wherein each element includes a plurality of anode sheets and a plurality of cathode sheets.

16. The capacitor of claim 11 wherein the second element includes a different number of anode sheets than the first element, such that the second element has a different electrical characteristic from the first element.