Detection of a protective conductor failure by means of an active shield
AssigneeDr. Ing. h.c. F. Porsche Aktiengesellschaft
InventorsStefan Götz, Steve Zander
Life of this patent
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Abstract
Method for detecting a protective conductor failure inside a cable including a plurality of conductors, in which at least one conductor has a shield and this shield is respectively connected to a potential at a first end and at a second end of the cable, wherein, in order to drive its potential to a predefined potential value, the shield is actively electrically supplied at at least one end of the cable. In this case, the cable may be a charging cable which is connected, by the first end, to a charging pole and is connected, by the second end, to a battery configured to be installed in an electric vehicle, and the shield is actively supplied at the first end of the cable which is connected to the charging pole.
Claims23
A method for detecting a protective conductor failure inside a cable comprising a plurality of conductors, in which the cable comprises a first end and a second end, and in which at least one conductor has a shield and this shield is connected to a potential by a potential connection at at least one end of the cable, wherein the method comprises:
- actively electrically supplying to the potential connection of the at least one conductor an electrical supply current from a current source in order to drive a shield potential of the shield to a predefined potential value, and
- detecting a failure of the protective conductor when an electrical variable occurring during the actively electrically supplying exceeds at least one limit value, the electrical variable being the electrical supply current that drives the shield potential of the shield measured at a circuit location upstream of the shield between the current source and the potential connection.
A system for detecting a protective conductor failure inside a cable comprising a plurality of conductors, in which the cable comprises a first end and a second end, and in which at least one conductor has a shield and this shield is connected to a potential at at least one end of the cable, the system comprising:
- at least one electrical module which is designed to actively supply the shield at at least one potential connection with an electrical supply current from a current source;
- and
- a detection unit configured to detect a protective conductor failure if an electrical variable occurring during active supply exceeds at least one limit value, the electrical variable being the electrical supply current that drives the shield potential of the shield measured at a circuit location upstream of the shield between the current source and the potential connection.
A method for detecting a protective conductor failure inside a cable comprising a plurality of conductors, in which the cable comprises a first end and a second end, and in which at least one conductor has a shield and this shield is connected to a potential by a potential connection at at least one end of the cable, wherein the method comprises:
- actively electrically supplying at the potential connection of the at least one conductor the potential in order to drive a shield potential of the shield to a predefined potential value, and
- detecting a failure of the protective conductor when an electrical variable occurring during the actively electrically supplying exceeds at least one limit value, the electrical variable being an electrical current that drives the shield potential of the shield measured at a circuit location upstream of the potential connection, the at least one limit value being a current integral threshold, such that if an integral of an instantaneous supplied current exceeds a predefined absolute value, a fault is detected, and a charging operation is switched off.
Dependencies are inferred from the claim text.