Stacked gas filled surge arrester

Patent metadata

Field	Value
Publication number	US-9356441-B2
Application number	US-201214346305-A
Country	US
Kind code	B2
Filing date	Sep 17, 2012
Priority date	Sep 23, 2011
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

A surge arrester comprising stacked arrester units is provided that is that is easy to assemble. For that, a surge arrester comprises stacked arrester units, a capacitor, and a resilient element, where the resilient element electrically and mechanically connects the capacitor with a node of the arrester stack.

First claim

The invention claimed is:

1. A surge arrester (SAR), comprising
a first terminal (T 1 ), a first node (N 1 ) and a second terminal (T 2 ),
an input arrester unit (AU 0 ) and a first arrester unit (AU 1 ), a first capacitor (CA 1 ), and a first resilient element (RE 1 ),
a first connection element (CE 1 ), a second connection element (CE 2 ) for connecting the surge arrester with an external circuit and a circuit board (CB) having a first side, where
the first node (N 1 ) is arranged between the first terminal (T 1 ) and the second terminal (T 2 ),
the input arrester unit (AU 0 ) is electrically connected between the first terminal (T 1 ) and the first node (N 1 ),
the first arrester unit (AU 1 ) is electrically connected between the first node (N 1 ) and the second terminal (N 2 ),
the first capacitor (CA 1 ) is electrically connected between the first terminal (T 1 ) and the first node (N 1 ),
the first resilient element (RE 1 ) establishes a mechanical and an electrical connection between the first capacitor (CA 1 ) and the first node (N 1 ), where
the arrester units (AU 0 , AU 1 ) are arranged between the connection elements (CE 1 , CE 2 ),
the connection elements (CE 1 , CE 2 ) are electrically connected to the first (T 1 ) and second (T 2 ) terminal respectively,
the circuit board (CB) is arranged between the connection elements (CE 1 , CE 2 ),
the first capacitor (CA 1 ) is arranged on the first side of the circuit board (CB),
the first resilient element (RE 1 ) is a metal clip (CL) mechanically connecting the circuit board (CB) with the first node (N 1 ).

2. The surge arrester of claim 1 , comprising
the input arrester unit (AU 0 ), n arrester units (AU 1 , SAU 2 , . . . ), n capacitors (CA 1 , CA 2 , . . . ), n Nodes (N 1 , N 2 , . . . ) and n resilient elements (RE 1 , RE 2 , . . . ), where
in the n-th stage the n-th resilient element (REn) establishes a mechanical and electrical connection between the n-th capacitor (CAn) and the n-th node (Nn), and
n=2, 3, 4, 5, or more.

3. The surge arrester of claim 2 , where
each arrester unit (AU 0 , AU 1 , . . . ) comprises a gas filled surge arrester,
each resilient element (RE 1 , RE 2 , . . . ) comprises a U-shaped distal end (U) for a mechanical connection between the circuit board (CB) and the respective node (N 1 , N 2 , . . . ), and a lever (LE) for exerting a force onto the respective node (N 1 , N 2 , . . . ).

4. The surge arrester of claim 3 , comprising a fuse (FU) being arranged on the first side of the circuit board (CB) and being electrically connected between the first terminal (TE) and the capacitors (CA 1 , CA 2 , . . . ).

5. The surge arrester of claim 3 , comprising a conductor being arranged on the first side of the circuit board (CB) and being electrically connected between the first terminal (TE) and the capacitors (CA 1 , CA 2 , . . . ).

6. The surge arrester of claim 5 , where the capacitors (CA 1 , CA 2 , . . . ) are SMD-capacitors.

7. The surge arrester of claim 6 , where
each capacitor (CA 1 , CA 2 , . . . ) has a capacity between 50 and 150 pF and
each stacked arrester unit has an arc voltage between 10 and 30 V.

8. The surge arrester of claim 1 , further comprising
electrodes (EL) between the arrester units (AU 0 , AU 1 , . . . ), where
the electrodes (EL) have a flat side (FS) for contacting the resilient element (RE 1 ).

9. The surge arrester of claim 1 , where
the first terminal and second terminal are braze welded to the respective arrester units, and
the connection elements are braze weldable to an external circuit board.

10. A method for manufacturing the surge arrester (SAR) of claim 1 , comprising the steps
providing a stack of arrester units (AU 0 , AU 1 ), the stack comprising a node (N 1 ) between the arrester units (AU 0 , AU 1 ),
providing a capacitor (CA 1 ) on a circuit board (CB),
electrically and mechanically connecting the circuit board (CB) with the node (N 1 ) via a resilient element (RE 1 ).

Assignees

• Epcos Ag

Inventors

• Bobert Peter
• Werner Frank

Classifications

• H01T4/06 Primary

  Mounting arrangements for a plurality of overvoltage arresters · CPC title

• H02H9/005 Primary

  avoiding undesired transient conditions · CPC title

• H01T4/20

  Arrangements for improving potential distribution · CPC title