Laminated film capacitor, film capacitor module, and power conversion system

Patent metadata

Field	Value
Publication number	US-9666365-B2
Application number	US-201514631516-A
Country	US
Kind code	B2
Filing date	Feb 25, 2015
Priority date	Mar 7, 2014
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

A laminated film capacitor that includes a laminated body of first capacitance electrodes and second capacitance electrodes stacked to be opposed to each other with dielectric films interposed therebetween. A first external electrode is electrically connected to the first capacitance electrodes and a second external electrode is electrically connected to the second capacitance electrodes. The laminated film capacitor includes heat dissipators that are connected to the external electrodes, and higher in heat dissipation performance than at least one of the first capacitance electrodes and second capacitance electrodes. The heat dissipators are larger in thickness than at least one of the first capacitance electrodes and second capacitance electrodes.

First claim

What is claimed is:

1. A laminated film capacitor comprising:
a laminated body having stacked first capacitance electrodes and second capacitance electrodes opposed to each other with first dielectric films interposed therebetween;
a first external electrode electrically connected to the first capacitance electrodes;
a second external electrode electrically connected to the second capacitance electrodes; and
a heat dissipator within the laminated body, positioned between at least one of a first pair of opposed, consecutively arranged first electrodes of the first capacitance electrodes and a second pair of opposed, consecutively arranged second electrodes of the second capacitance electrodes, connected to one of the first external electrode and the second external electrode, higher in heat dissipation performance than at least one of the first capacitance electrodes and the second capacitance electrodes, and larger in thickness than at least one of the first capacitance electrodes and the second capacitance electrodes.

2. The laminated film capacitor according to claim 1 , wherein the first capacitance electrodes and the second capacitance electrodes are deposited metal films.

3. The laminated film capacitor according to claim 1 , wherein the heat dissipator is opposed to a second capacitance electrode of the second capacitance electrodes with a second dielectric film interposed therebetween, and connected to the second capacitance electrodes.

4. The laminated film capacitor according to claim 1 , wherein the heat dissipator is opposed to a second capacitance electrode of the second capacitance electrodes with a second dielectric film interposed therebetween, comprises a conductor, and is connected to the first capacitance electrodes.

5. The laminated film capacitor according to claim 1 , wherein the first external electrode and the second external electrode are metallikon electrodes.

6. The laminated film capacitor according to claim 1 , wherein the heat dissipator extends from a center of the laminated film capacitor to the end edge thereof.

7. A film capacitor module comprising:
the laminated film capacitor according to claim 1 ; and
a connection electrode connected to at least one of the first external electrode and the second external electrode.

8. The film capacitor module according to claim 7 , further comprising:
an external circuit connected to the connection electrode.

9. A power conversion system comprising the laminated film capacitor according to claim 1 , the laminated film capacitor being configured as a smoothing capacitor that reduces surge superimposed on a direct-current voltage so as to convert one of direct-current power and alternating-current power to the other.

10. A laminated film capacitor comprising:
a laminated body having stacked first capacitance electrodes and second capacitance electrodes opposed to each other with first dielectric films interposed therebetween;
a first external electrode electrically connected to the first capacitance electrodes;
a second external electrode electrically connected to the second capacitance electrodes; and
a heat dissipator within the laminated body, positioned between at least one of a first pair of opposed, consecutively arranged first electrodes of the first capacitance electrodes and a second pair of opposed, consecutively arranged second electrodes of the second capacitance electrodes, connected to one of the first external electrode and the second external electrode, higher in heat dissipation performance than at least one of the first capacitance electrodes and the second capacitance electrodes, and lower in thermal resistance than at least one of the first capacitance electrodes and the second capacitance electrodes.

11. The laminated film capacitor according to claim 10 , wherein the first capacitance electrodes and the second capacitance electrodes are deposited metal films.

12. The laminated film capacitor according claim 10 , wherein the heat dissipator is opposed to a second capacitance electrode of the second capacitance electrodes with a second dielectric film interposed therebetween, and connected to the second capacitance electrodes.

13. The laminated film capacitor according to claim 10 , wherein the heat dissipator is opposed to a second capacitance electrode of the second capacitance electrodes with a second dielectric film interposed therebetween, comprises a conductor, and is connected to the first capacitance electrodes.

14. The laminated film capacitor according to claim 10 , wherein the first external electrode and the second external electrode are metallikon electrodes.

15. The laminated film capacitor according to claim 10 , wherein the heat dissipator extends from a center of the laminated film capacitor to the end edge thereof.

16. A film capacitor module comprising:
the laminated film capacitor according to claim 10 ; and
a connection electrode connected to at least one of the first external electrode and the second external electrode.

17. The film capacitor module according to claim 16 , further comprising:
an external circuit connected to the connection electrode.

18. A power conversion system comprising:
the laminated film capacitor according claim 10 , the laminated film capacitor being configured as a smoothing capacitor that reduces surge superimposed on a direct-current voltage so as to convert one of direct-current power and alternating-current power to the other.

Assignees

• Murata Manufacturing Co

Inventors

• Nishiyama Shigeki

Classifications

• H01G4/30

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• H01G4/015

  Special provisions for self-healing · CPC title

• H02M7/003

  Constructional details, e.g. physical layout, assembly, wiring or busbar connections · CPC title

• H01G2/08 Primary

  Cooling arrangements; Heating arrangements; Ventilating arrangements · CPC title

• H01G4/12

  Ceramic dielectrics {(H01G4/085 takes precedence)} · CPC title