Automotive onboard electrical system and how the automotive onboard electrical system works

摘要

The present invention relates to an automotive onboard electrical system (1), wherein the onboard electrical system comprises a primary power supply network (2); And a secondary power supply network 3 electrically connected to the primary power supply network 2 through the DC / DC converter 10, wherein the primary power supply network 2 and the secondary power supply network 3 are DC / Connected to each other through the blocking diode 11 of the DC converter 10, the blocking diode 11 has its own forward direction from the primary power supply network 2 to the secondary power supply network 3, and the secondary power supply The network 3 is assigned with an insulation monitoring device 17 for detecting insulation defects, including measurement resistors. According to the invention, for the bridge of the blocking diode 11, an additional resistor 18 is connected in parallel with the blocking diode, whereby the primary power supply network 2 and the secondary power supply by the insulation monitoring device 17 Co-insulation defects in the network 3 can be detected.