Disconnecting device for galvanic direct current interruption

Patent metadata

Field	Value
Publication number	US-2017229256-A1
Application number	US-201715494931-A
Country	US
Kind code	A1
Filing date	Apr 24, 2017
Priority date	Oct 24, 2014
Publication date	Aug 10, 2017
Grant date	—

Abstract

A disconnecting device for interrupting a direct current between a direct current source and an electric apparatus, having a current-conducting mechanical switch, a power electronics unit connected thereto, and an energy store which is charged by an arcing voltage generated on the switch by an arc as the switch is being disconnected. A pulse generator that is connected to the energy store triggers at least one semiconductor switch of the power electronics unit in such a way that the power electronics unit short-circuits the switch and the arc is extinguished.

First claim

What is claimed is:

1 . A disconnecting device for a direct circuit interruption between a direct current source and an electrical apparatus, the disconnecting device comprising:
a current-conducting mechanical switch; a power electronics unit connected to the current-conducting mechanical switch; an energy store that is adapted to be charged by an arcing voltage generated on the switch by an arc as the switch is being disconnected; and a pulse generator connected to the energy store, the pulse generator being adapted to trigger at least one semiconductor switch of the power electronics unit such that the power electronics unit short-circuits the switch and the arc is extinguished.

2 . The disconnecting device according to claim 1 , wherein the pulse generator comprises a semiconductor switch that is connected to the energy store and is connected upstream of a voltage tap, and wherein the pulse generator switches to conducting when the charging voltage of the energy store reaches a set or adjustable operating voltage.

3 . The disconnecting device according to claim 1 , wherein, on a control side, the power electronics unit taps a control pulse generated from the charging voltage or from the operating voltage at the voltage tap of the pulse generator.

4 . The disconnecting device according to claim 1 , wherein the pulse generator or a semiconductor switch thereof, blocks an output of a control pulse for the power electronics unit when the switch is disconnected.

5 . The disconnecting device according to claim 1 , wherein the power electronics unit has a first semiconductor switch or an IGBT with a free-wheeling diode, which is connected into a first current path, which is connected to a first switching connection of the mechanical switch, and wherein the power electronics unit has a second semiconductor switch or an IGBT with a free-wheeling diode, which is connected into a second current path to which a second switching connection of the mechanical switch is connected.

6 . The disconnecting device according to claim 1 , wherein the power electronics unit has a driver stage with transistors connected to a complementary output stage, which are connected to the energy store on a collector-emitter side and are connected on a base side to the voltage tap of the pulse generator.

7 . The disconnecting device according to claim 1 , wherein the or each semiconductor switch of the power electronics unit is connected on the collector-base side by a series circuit having a resistor and a diode, which is connected to a protective circuit, which switches off the control pulse of the pulse generator when the collector-emitter voltage of the semiconductor switch of the power electronics unit exceeds a threshold value.

8 . The disconnecting device according to claim 1 , wherein the pulse generator has a capacitor connected to the energy store and, in addition to the semiconductor switch connected upstream of the voltage tap, has a semiconductor circuit, which turns off the control pulse at the voltage tap when due to the charging of the capacitor, the switching voltage of a semiconductor switch of the semiconductor circuit, which is connected to the voltage tap, is reached.

9 . The disconnecting device according to claim 1 , further comprising a power supply connected to the power electronics unit, with at least one semiconductor switch, which is connected to the energy store, and which is activated for charging the energy store and, upon reaching an operating voltage, for subsequently terminating the charging process.

10 . The disconnecting device according to claim 1 , further comprising a rectifier circuit for rectifying the arcing voltage.

Assignees

• Ellenberger & Poensgen

Inventors

• Wilkening Ernst-Dieter
• Koepf Hendrik-Christian
• Boesche Dirk

Classifications

• H01H9/54

  Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere · CPC title

• H01H2009/544

  the static switching means being an insulated gate bipolar transistor, e.g. IGBT, Darlington configuration of FET and bipolar transistor · CPC title

• H01H2009/546

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

• H02H3/20

  responsive to excess voltage · CPC title

• H01H9/542 Primary

  Contacts shunted by static switch means · CPC title