The invention relates to a method for detecting insulation faults (RF, RF) in a vehicle electrical system (FB) having an HV electrical system branch (HB) and an LV electrical system branch (LB). The LV on-board electrical system branch (LV) has at least one LV potential (1-5) and a second LV potential (L-) which differs therefrom and which corresponds to a ground potential (M) of the on-board electrical system of the vehicle. The HV on-board electrical system branch (HB) has a positive HV potential (HV +) and a negative HV potential (HV-). These HV potentials are electrically isolated from the potential of the LV on-board electrical network branch (LB). An insulation fault (RF, RF) between at least one of the HV potentials (HV +, HV-) and the first LV potential (1-5) is detected by identifying the through current (I, I). This passing current passes through a voltage limiting circuit (SG) connected between a ground potential (M) and a first LV potential (1-5). This circuit connects the first LV potential (1-5) via a plurality of diodes D to a voltage limiting element (V, V), which is connected to the ground potential (GND) of the vehicle electrical system. The invention further relates to a vehicle overvoltage protection circuit (SG) having a plurality of diode half-bridges (HB) which connect the LV potential to the voltage limiting elements (V, V) to the ground potential (GND). The diode half-bridge (HB) guides an overvoltage and leads this overvoltage to a ground potential via a voltage limiting element.
本发明涉及一种用于检测车辆车载电网(FB)中的绝缘故障(RF、RF´)的方法,该车辆车载电网带有HV车载电网分支(HB)和LV车载电网分支(LB)。LV车载电网分支(LV)具有至少一个LV电位(1‑5)和与之不同的第二LV电位(L‑),第二LV电位对应车辆车载电网的接地电位(M)。HV车载电网分支(HB)具有正的HV电位(HV+)和负的HV电位(HV‑)。这些HV电位与LV车载电网分支(LB)的电位电隔离。通过识别通过电流(I、I´)来检测在HV电位(HV+、HV‑)中的至少一个HV电位和第一LV电位(1‑5)之间的绝缘故障(RF、RF´)。这个通过电流经过连接在接地电位(M)和第一LV电位(1‑5)之间的限压电路(SG)。这个电路将第一LV电位(1‑5)通过多个二极管D与限压元件(V、V´)连接起来,限压元件连接到车辆车载电网的接地电位(GND)上。此外还说明了一种车辆过电压保护电路(SG),其具有多个二极管半桥(HB),二极管半桥将LV电位与通往接地电位(GND)的限压元件(V、V´)连接起来。二极管半桥(HB)引导过电压并且将这个过电压通过限压元件导出给接地电位。
METHOD FOR DETECTING AN INSULATION FAULT IN AN ON-BOARD ELECTRICAL SYSTEM OF A VEHICLE, AND VEHICLE
用于检测车辆车载电网中的绝缘故障的方法和车辆过电压保护电路
2023-04-07
Patent
Electronic Resource
Chinese
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