Method for detecting an insulation fault in a vehicle electrical system

The integration of a voltage limiting circuit in the low-voltage branch of vehicle electrical systems ensures reliable detection of insulation faults by generating a current flow above a defined breakdown voltage, addressing the challenge of undetected high-impedance faults and preventing hazardous high-voltage exposure in low-voltage components.

DE102020206953B4Active Publication Date: 2026-05-28SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Application Number
DE102020206953
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-06-03
Publication Date
2026-05-28
Estimated Expiration
2040-06-03

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Abstract

A method for detecting an insulation fault in a vehicle electrical system comprising a high-voltage (HV) branch (HB) designed for operating voltages above 60 volts and a low-voltage (LV) branch (LB) designed for a low voltage of less than 60 V, wherein the LV branch (LB) has a positive supply potential (L+) and a negative supply potential (L-) corresponding to a ground potential (M) of the vehicle electrical system, and the HV branch (HB) has a positive HV potential (+) and a negative HV potential (-) that are galvanically isolated from the potentials of the LV branch (LB), wherein an insulation fault (RF) between at least one of the HV potentials (-, +) and a positive LV potential (L+, G+) is detected by detecting a current flow (I) through a voltage limiting circuit (SG) connected between the ground potential (M) and is connected to the positive LV potential (L+, G+).
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Citation Information

Patent Citations

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