Switching device for controlling energy supply of a downstream electric motor

摘要

A switching device includes an energy store and a measuring device connected to a control apparatus. The energy store is connected in series between the supply connection and the power supply. The control apparatus can monitor the energy supply of the switching device in the area between the supply connection and the power supply taking place via the supply connection via the measuring device. If the energy supply monitored by the measuring device falls into a critical range, and using the energy from the energy store: the control apparatus connects the semiconductor switch in an electrically conductive manner and then opens the second switch; and subsequently switches the semiconductor switch to an electrically non-conductive state and then opens the first switch.

主权项

1. A switching device comprising:
a control unit; a power supply connection; a power supply unit; and a first current path connected to a power supply network, including a first electromechanical switch and a parallel circuit of a second electromechanical switch with a semiconductor switch connected in series to the first switch, wherein the control unit is able to emit a switching signal for the first switch, the second switch and the semiconductor switch, wherein the power supply connection is connected to the power supply unit and the control unit obtains via the power supply unit the energy for the switching signals,the switching device comprises an energy store and a measuring device connected to the control unit, wherein the energy store is connected in series between the power supply connection and the power supply unit so that, by way of the energy store, energy supplied via the power supply connection is buffered by the power supply source on the inside of the device, wherein the control unit is able to monitor by way of the measuring device the energy supplied to the switching device via the power supply connection in the region between the power supply connection and the power supply unit, wherein the control unit is configured such that if the energy supply monitored by way of the measuring device falls into a critical range, and using the energy from the energy store, and wherein said control unit is configured to
switch the semiconductor switch to an electrically conductive state and then open the second switch; and subsequently switch the semiconductor switch to an electrically non-conductive state and then open the first switch.