Disconnecting device for interrupting a direct current of a current path, and on-board electrical system of a motor vehicle

Patent metadata

Field	Value
Publication number	US-11322319-B2
Application number	US-202017015316-A
Country	US
Kind code	B2
Filing date	Sep 9, 2020
Priority date	Mar 9, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A separating device for interrupting a direct current of a current path, in particular for an on-board electrical system of a motor vehicle. The separating device has a hybrid switch with a current-conducting mechanical contact system and a first semiconductor switch connected to the hybrid switch in parallel and having a switchable resistance cascade with at least one ohmic resistor which is connected to the contact system of the hybrid switch in parallel.

First claim

The invention claimed is:

1. A disconnecting device for interrupting a direct current of a current path, comprising:
a hybrid switch having a current-carrying mechanical contact system and a first semiconductor switch connected in parallel with said current-carrying mechanical contact system; and
a switchable resistance cascade having at least one ohmic resistor, said switchable resistance cascade being connected in parallel with said current-carrying mechanical contact system of said hybrid switch;
said switchable resistance cascade containing at least one second semiconductor switch connected in series with said at least one ohmic resistor;
a third semiconductor switch;
said switchable hybrid switch configured to be short-circuited by means of a series circuit formed by said switchable resistance cascade together with said third semiconductor switch; and
a common controller, each of said first, second and third semiconductor switches being connected to said common controller on a driving side.

2. The disconnecting device according to claim 1 , further comprising an overcurrent protection unit connected upstream of said hybrid switch.

3. The disconnecting device according to claim 2 , wherein said overcurrent protection unit is embodied as a fusible link.

4. The disconnecting device according to claim 1 , wherein said switchable resistance cascade is embodied as a cascading switch-off overvoltage limiter.

5. The disconnecting device according to claim 1 , wherein the disconnecting device is for interrupting the current path of an on-board electrical system of a motor vehicle.

6. An on-board electrical system for a motor vehicle, the on-board electrical system comprising:
a DC circuit having an energy store, a current path, and a disconnecting device according to claim 1 disposed in said current path.

7. A disconnecting device for interrupting a direct current of a current path, comprising:
a hybrid switch having a current-carrying mechanical contact system and a first semiconductor switch connected in parallel with said current-carrying mechanical contact system;
a switchable resistance cascade having at least one ohmic resistor, said switchable resistance cascade being connected in parallel with said current-carrying mechanical contact system of said hybrid switch;
said switchable resistance cascade containing at least one second semiconductor switch connected in series with said at least one ohmic resistor;
a third semiconductor switch; and
said current-carrying mechanical contract system of said hybrid switch configured to be short-circuited by means of a series circuit formed by said switchable resistance cascade together with said third semiconductor switch.

Assignees

• Ellenberger & Poensgen

Inventors

• Boesche Dirk
• Wilkening Ernst-Dieter

Classifications

• H01H33/596

  for interrupting DC · CPC title

• H02H3/025

  Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection · CPC title

• H01H9/541 Primary

  Contacts shunted by semiconductor devices · CPC title

• H01H2009/546

  the static switching means being triggered by the voltage over the mechanical switch contacts · CPC title

• B60R16/02

  electric {constitutive elements} · CPC title