Switching device for electrically coupling a DC link capacitance of a DC intermediate circuit with a DC voltage source

摘要

The invention relates to a method for electrically coupling a DC link capacitance (15) of a DC intermediate circuit (17) of an electrically driven motor vehicle to a DC voltage source (1) of the electrically driven motor vehicle, wherein the DC voltage source (1) is connected to the DC intermediate circuit (17) by means of a switching unit (17). 18) which is controlled by means of a switching signal of a control unit (13), and is electrically coupled by means of a parallel to the switching unit (18) precharging unit (19), wherein by means of a to the switching unit (18) connected to the comparison unit (8) has an electrical potential difference between the DC voltage source (1) and the DC intermediate circuit (17) is detected, and at a detected potential difference greater than a comparison potential difference, an establishment of an electrically coupled state by the switching unit (18) is blocked.