Capacitor device

Patent metadata

Field	Value
Publication number	US-10978253-B2
Application number	US-201816485322-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Mar 14, 2017
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A capacitor circuit (capacitor device 20, 30, 34, 50 ) in which a plurality of capacitors ( 41 to 45 ) are connected to each other is included, one or two or more capacitors (overvoltage short-circuiting capacitors 40, 40 a, 40 b, 40 c, 40 d ) in the capacitor circuit have a dielectric breakdown voltage made lower than that of another capacitor, and the one or two or more capacitors having the lower dielectric breakdown voltage are subjected to dielectric breakdown due to application of an overvoltage earlier than the other capacitor so that the capacitor circuit is short-circuited. As a result, the safety of the capacitor device and a device connected thereto can be enhanced.

First claim

The invention claimed is:

1. A capacitor device comprising: a capacitor circuit in which a plurality of capacitors are connected to each other, wherein
one or two or more capacitors in the capacitor circuit have a dielectric breakdown voltage made lower than that of another capacitor, and wherein the one or two or more capacitors having the lower dielectric breakdown voltage are subjected to dielectric breakdown due to application of an overvoltage earlier than the other capacitor so that the capacitor circuit is short-circuited.

2. The capacitor device according to claim 1 , wherein the one or two or more capacitors each comprise an overvoltage short-circuiting function part.

3. The capacitor device according to claim 1 , wherein capacitor groups each including a plurality of the capacitors connected in parallel are formed in the capacitor circuit, and wherein each of the capacitor groups includes at least one of the capacitors having the lower dielectric breakdown voltage.

4. The capacitor device according to claim 1 , wherein the one or two or more capacitors each comprise, in a portion of a separator interposed between electrode foils, a low insulating part having a low insulating function for the electrode foils.

5. The capacitor device according to claim 1 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

6. The capacitor device according to claim 2 , wherein capacitor groups each including a plurality of the capacitors connected in parallel are formed in the capacitor circuit, and wherein each of the capacitor groups includes at least one of the capacitors having the lower dielectric breakdown voltage.

7. The capacitor device according to claim 2 , wherein the one or two or more capacitors each comprise, in a portion of a separator interposed between electrode foils, a low insulating part having a low insulating function for the electrode foils.

8. The capacitor device according to claim 3 , wherein the one or two or more capacitors each comprise, in a portion of a separator interposed between electrode foils, a low insulating part having a low insulating function for the electrode foils.

9. The capacitor device according to claim 6 , wherein the one or two or more capacitors each comprise, in a portion of a separator interposed between electrode foils, a low insulating part having a low insulating function for the electrode foils.

10. The capacitor device according to claim 2 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

11. The capacitor device according to claim 3 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

12. The capacitor device according to claim 4 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

13. The capacitor device according to claim 6 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

14. The capacitor device according to claim 7 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

15. The capacitor device according to claim 8 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

16. The capacitor device according to claim 9 , wherein the capacitor circuit comprises a protective housing or protective housings at least around the one or two or more capacitors.

Assignees

• Nippon Chemicon

Inventors

• Shimizu Makoto
• Onda Kenichi

Classifications

• H01G2/14 Primary

  Protection against electric or thermal overload (by cooling H01G2/08) · CPC title

• H01G9/0003 Primary

  Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films (H01G9/12 takes precedence) · CPC title

• H01G9/151

  with wound foil electrodes · CPC title

• H01G9/26

  Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices with each other · CPC title

• H01G2/16

  with fusing elements · CPC title