Circuit arrangement for monitoring an electrical insulation

摘要

A circuit configuration monitors the electrical insulation of an electrically conductive part in relation to a first pole and a second pole of an electrical power network for example, an electrical drive network in a hybrid vehicle. The circuit configuration is characterized in that between the electrically conductive part and the two poles, a voltage divider having at least two resistors is arranged in each case. A measuring unit is associated with each of the two voltage dividers and provided for measuring a partial voltage, which drops via at least one of the resistors. A switch unit is associated each with the two voltage dividers and is provided for alternately bypassing at least one of the resistors.

主权项

1. A circuit configuration for monitoring electrical insulation of an electrically conductive part relative to a first pole and a second pole of an electrical power network, the circuit configuration comprising:
a first voltage divider connected between the electrically conductive part and the first pole, and a second voltage divider connected between the electrically conductive part and the second pole, said first voltage divider having at least two resistors and said second voltage divider having at least two resistors; a first measuring device coupled to said first voltage divider for measuring a partial voltage that drops across at least one of said at least two resistors of said first voltage divider; a second measuring device coupled to said second voltage divider for measuring a partial voltage that drops across at least one of said at least two resistors of said second voltage divider; a first switch device connected to said first voltage divider, said first switch device having a conduction state in which at least one of said at least two resistors of said first voltage divider is bypassed; and a second switch device connected to said second voltage divider, said second switch device having a conducting state in which at least one of said at least two resistors of said second voltage divider is bypassed.