Snubber module, snubber apparatus and power conversion apparatus

Patent metadata

Field	Value
Publication number	US-11218070-B2
Application number	US-202016799660-A
Country	US
Kind code	B2
Filing date	Feb 24, 2020
Priority date	Mar 13, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A snubber module is provided, which constitutes a snubber apparatus attachable to a terminal of a semiconductor module. The snubber module includes: a positive-side capacitor, a first diode and a negative-side capacitor sequentially connected between a positive-side snubber terminal and a negative-side snubber terminal, the positive-side snubber terminal connectable to a positive-side terminal of the semiconductor module, and the negative-side snubber terminal connectable to a negative-side terminal of the semiconductor module; a first coupling terminal directly or indirectly connected to one node of either a first node between the positive-side capacitor and the first diode or a second node between the negative-side capacitor and the first diode; and a housing accommodating the positive-side capacitor, the negative-side capacitor and the first diode, and having provided therein the positive-side snubber terminal, the negative-side snubber terminal and the first coupling terminal in a manner enabling external connection.

First claim

What is claimed is:

1. A snubber apparatus attachable to a terminal of a semiconductor module, the snubber apparatus comprising:
at least one first snubber module and at least one second snubber module, each including:
a positive-side capacitor, a first diode and a negative-side capacitor sequentially connected between a positive-side snubber terminal and a negative-side snubber terminal, the positive-side snubber terminal being connectable to a positive-side terminal of the semiconductor module, and the negative-side snubber terminal being connectable to a negative-side terminal of the semiconductor module;
a first coupling terminal directly or indirectly connected to one node of either a first node or a second node, the first node being located between the positive-side capacitor and the first diode, and the second node being located between the negative-side capacitor and the first diode; and
a housing accommodating the positive-side capacitor, the negative-side capacitor and the first diode, and having provided therein the positive-side snubber terminal, the negative-side snubber terminal and the first coupling terminal in a manner enabling external connection, wherein

the at least one second snubber module further includes a second coupling terminal directly or indirectly connected to another node of the first node and the second node that is different from the one node,
the positive-side snubber terminal and the negative-side snubber terminal of each of the at least one first snubber module and the at least one second snubber module are provided on one surface of the respective housing of the at least one first snubber module and the at least one second snubber module, the one surface facing a first direction,
wherein the first coupling terminal and the second coupling terminal each are a coupling terminal, and the at least one first snubber module and the at least one second snubber module each are a snubber module,
wherein
the snubber modules are sequentially connected by connecting nearest of the coupling terminals of snubber modules adjacent one another, and
the coupling terminals being provided on another surface of the respective housing of the snubber modules, the another surface facing a second direction that is different from the first direction.

2. A snubber apparatus attachable to a terminal of a semiconductor module, the snubber apparatus comprising:
at least one first snubber module and at least one second snubber module, each including:
a positive-side capacitor, a first diode and a negative-side capacitor sequentially connected between a positive-side snubber terminal and a negative-side snubber terminal, the positive-side snubber terminal being connectable to a positive-side terminal of the semiconductor module, and the negative-side snubber terminal being connectable to a negative-side terminal of the semiconductor module;
a first coupling terminal directly or indirectly connected to one node of either a first node or a second node, the first node being located between the positive-side capacitor and the first diode, and the second node being located between the negative-side capacitor and the first diode; and
a housing accommodating the positive-side capacitor, the negative-side capacitor and the first diode, and having provided therein the positive-side snubber terminal, the negative-side snubber terminal and the first coupling terminal in a manner enabling external connection,

a plurality of charge paths parallel to one another and each allowing current to flow in a direction from the positive-side terminal to the negative-side terminal; and
a plurality of discharge paths parallel to one another and each allowing current to flow in a direction from the negative-side terminal to the positive-side terminal, and
a wiring inductance of each discharge path is greater than a wiring inductance in each charge path, wherein
the at least one second snubber module further includes a second coupling terminal directly or indirectly connected to another node of the first node and the second node that is different from the one node,
the respective snubber modules are sequentially connected via the first coupling terminal and the second coupling terminal.

3. The snubber apparatus according to claim 2 , wherein at least one of the at least one first snubber module and the at least one second snubber module further includes a second diode provided between the one node and the first coupling terminal and allowing current to flow in a direction from the negative-side terminal to the positive-side terminal.

4. The snubber apparatus according to claim 2 , wherein the at least one first snubber module further includes a second coupling terminal directly or indirectly connected to another node of the first node and the second node that is different from the one node.

5. The snubber apparatus according to claim 4 , wherein at least one of the at least one first snubber module and the at least one second snubber module further includes a third diode provided between the other node and the second coupling terminal and allowing current to flow in a direction from the negative-side terminal to the positive-side terminal.

6. The snubber apparatus according to claim 4 , wherein at least one of the first coupling terminal and the second coupling terminal is pulled out of the housing via an electric wire.

7. The snubber apparatus according to claim 2 , wherein at least one of the at least one first snubber module and the at least one second snubber module further includes a fourth diode provided along a path joining another node and the positive-side snubber terminal or the negative-side snubber terminal with the one node interposed, and allowing current to flow in a direction from the negative-side terminal to the positive-side terminal, the other node being one of the first node and the second node that is different from the one node.

8. A power conversion apparatus comprising:
the semiconductor module; and
the snubber apparatus according to claim 2 .

9. The snubber apparatus according to claim 2 , wherein at least part of the plurality of discharge paths are connected by a loop-shaped wiring bar.

Assignees

• Fuji Electric Co Ltd

Inventors

• Wang Qichen
• Yamada Ryuji

Classifications

• H02M7/5387

  in a bridge configuration · CPC title

• H02M1/34 Primary

  Snubber circuits · CPC title

• H02M7/003 Primary

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

• H02M1/346

  Passive non-dissipative snubbers · CPC title

• H02M1/342

  Active non-dissipative snubbers · CPC title