CR snubber element

Patent metadata

Field	Value
Publication number	US-11303201-B2
Application number	US-202017023710-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Jun 15, 2018
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

A CR snubber element includes a first resistance part, a first capacitance part, a second resistance part, and a second capacitance part. The first capacitance part is connected in series to the first resistance part. The second resistance part is connected in series to the first resistance part and the first capacitance part and the second capacitance part is connected in parallel to the second resistance part. The CR snubber element is configured such that the second resistance part is disconnected when the first capacitance part is short-circuited.

First claim

The invention claimed is:

1. A CR snubber element comprising:
a first resistance part;
a first capacitance part connected in series to the first resistance part;
a second resistance part connected in series to the first resistance part and the first capacitance part; and
a second capacitance part connected in parallel to the second resistance part,
wherein the second resistance part is configured to be disconnected when the first capacitance part is short-circuited due to a surge voltage generated by an electronic component coupled to the CR snubber element.

2. The CR snubber element according to claim 1 , wherein the second resistance part is configured by a thin film resistor.

3. The CR snubber element according to claim 1 , wherein the second capacitance part comprises a capacitance substantially identical to a capacitance of the first capacitance part.

4. The CR snubber element according to claim 1 , wherein the second resistance part comprises a resistance value that is smaller than a resistance value of the first resistance part.

5. The CR snubber element according to claim 1 , wherein the second resistance part comprises a value of a fusing current that is smaller than a value of a fusing current of the first resistance part.

6. The CR snubber element according to claim 1 ,
wherein the first resistance part is configured by a semiconductor substrate having a first main surface, and
wherein the first capacitance part is configured by the semiconductor substrate facing an internal electrode that is disposed on a side of a first dielectric layer disposed on the first main surface of the semiconductor substrate.

7. The CR snubber element according to claim 6 , wherein the second capacitance part is configured by the internal electrode facing an external electrode that is disposed on a side of a second dielectric layer opposite to the internal electrode and across the second dielectric layer that is disposed on a side of the internal electrode opposite to the first dielectric layer.

8. The CR snubber element according to claim 7 , wherein the second resistance part is disposed on the second dielectric layer, is connected to the external electrode, and is connected to the internal electrode with a connection conductive part disposed to penetrate the second dielectric layer interposed between the second resistance part and the internal electrode.

9. The CR snubber element according to claim 1 ,
wherein the first resistance part is configured by a semiconductor substrate having a first main surface and a second main surface that opposes the first main surface, and
wherein the first capacitance part is configured by the semiconductor substrate facing a first external electrode located on a side of a first dielectric layer disposed on the second main surface of the semiconductor substrate.

10. The CR snubber element according to claim 9 , wherein the second capacitance part is configured by an internal electrode that is disposed on the first main surface of the semiconductor substrate, with the internal electrode facing a second external electrode located on a side of a second dielectric layer opposite to the internal electrode across the second dielectric layer located on a side of the internal electrode opposite to the semiconductor substrate.

11. The CR snubber element according to claim 10 , wherein the second resistance part is located on a side of the second external electrode of the second dielectric layer, is connected to the second external electrode, and is connected to the internal electrode with a connection conductive part disposed to penetrate the second dielectric layer interposed between the second resistance part and the internal electrode.

12. The CR snubber element according to claim 1 ,
wherein the first resistance part is configured by a semiconductor substrate having a first main surface and a second main surface that opposes the first main surface, and
wherein the first capacitance part is configured by the semiconductor substrate facing a first external electrode located on a side of a first dielectric layer disposed on the first main surface of the semiconductor substrate.

13. The CR snubber element according to claim 12 , wherein the second capacitance part is configured by an internal electrode located on a side of the second main surface of the semiconductor substrate, with the internal electrode facing a second external electrode that is disposed on a side of a second dielectric layer disposed on the internal electrode opposite to the semiconductor substrate.

14. The CR snubber element according to claim 13 , wherein the second resistance part is disposed on a side of the second external electrode of the second dielectric layer, is connected to the second external electrode, and is connected to the internal electrode with a connection conductive part disposed to penetrate the second dielectric layer interposed between the second resistance part and the internal electrode.

15. A CR snubber element comprising:
a semiconductor substrate having a first main surface that configures a first resistance part;
a first dielectric layer disposed on the first main surface of the semiconductor substrate with an internal electrode disposed thereon that configures a first capacitance part connected in series to the first resistance part; and
an external electrode that is disposed on a side of a second dielectric layer opposite to the internal electrode and across the second dielectric layer so as to configure a second capacitance part that is connected in parallel to a second resistance part that is connected in series to the first resistance part and the first capacitance part,
wherein the second resistance part is configured to disconnect when the first capacitance part is short-circuited.

16. The CR snubber element according to claim 15 , wherein the second resistance part is disposed on the second dielectric layer, is connected to the external electrode, and is connected to the internal electrode with a connection conductor extending through the second dielectric layer that is interposed between the second resistance part and the internal electrode.

17. The CR snubber element according to claim 15 , wherein the second resistance part is configured by a thin film resistor.

18. The CR snubber element according to claim 15 , wherein the second capacitance part comprises a capacitance substantially identical to a capacitance of the first capacitance part.

19. The CR snubber element according to claim 15 , wherein the second resistance part comprises a resistance value that is smaller than a resistance value of the first resistance part.

20. The CR snubber element according to claim 15 , wherein the second resistance part comprises a value of a fusing current that is smaller than a value of a fusing current of the first resistance part.

Assignees

• Murata Manufacturing Co

Inventors

• Ashimine Tomoyuki
• Nakagawa Hiroshi
• Murase Yasuhiro

Classifications

• H10D84/206

  of combinations of capacitors and resistors · CPC title

• H10D1/716

  having vertical extensions · CPC title

• H10D1/47 Primary

  Resistors having no potential barriers · CPC title

• H10D88/101

  comprising components on opposite major surfaces of semiconductor substrates · CPC title

• H02M1/348

  Passive dissipative snubbers · CPC title