Method for detecting an insulation fault of an electrical system
The method and control device with an insulation monitor and pre-charging circuit in high-voltage systems of electric vehicles provide precise fault localization by measuring voltage values during different circuit phases, addressing the challenge of unreliable fault detection and reducing safety risks.
WO2026124723A1PCT designated stage Publication Date: 2026-06-18SCHAEFFLER TECHNOLOGIES AG & CO KG
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SCHAEFFLER TECHNOLOGIES AG & CO KG
- Filing Date
- 2025-11-21
- Publication Date
- 2026-06-18
Smart Images
Figure DE2025101100_18062026_PF_FP_ABST
Abstract
The system comprises a battery (HV-BATT), a load connection, a first high-voltage supply path (HV+) having a first switchable disconnecting device (SW1), a second high-voltage supply path (HV-) having a second switchable disconnecting device (SW2), a positive battery-side insulation, a negative battery-side insulation, a positive load-side insulation, a negative load-side insulation, and an insulation monitoring device (20). On the basis of voltage values provided by the insulation monitoring device (20), it is detected whether there is a positive insulation fault or a negative insulation fault. If a positive insulation fault is detected, a verification switching phase is set in such a way that the first disconnecting device (SW1) and the second disconnecting device (SW2) are in an open state and the pre-charging disconnecting device (SW_PRE) is in a closed state, and if a negative insulation fault is detected, the verification switching phase is set in such a way that the first disconnecting device (SW1) is in a closed state and the second disconnecting device (SW2) and the pre-charging disconnecting device (SW_PRE) are in an open state.
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