Method and device for detecting short circuit
AssigneeSiemens Aktiengesellschaft
InventorsHeike Barlag, Johannes Reinschke
Life of this patent
Estimating the term…
Abstract
In a charge cable which can be connected to an electric charging device to charge a battery of an electric vehicle, a method for detecting a short-circuit selects a first voltage value for a test voltage. By applying this test voltage to the charge cable, testing is carried out to determine whether there is a short-circuit , a fault signal is output; if there is a no short-circuit, the test voltage is increased incrementally up to a maximum voltage value. The increased test voltage is used to test whether there is a short-circuit in the charge cable or in the contact connected to the charge cable.
Claims10
1-9. (canceled)
A method for detecting a short circuit in a charging cable which can be connected to an electrical charging device to charge a battery of an electric vehicle, comprising:
- choosing a first voltage value as a test voltage;
- applying the test voltage to the charging cable in testing whether the charging cable or a contact connected to the charging cable is short circuited;
- outputting a fault signal upon detection of a short circuit;
- increasing the test voltage in steps up to a maximum voltage value when no short circuit is detected during said applying and using respective step increases of the test voltage in testing whether the charging cable or the contact connected to the charging cable is short circuited;
- and
- determining whether the charging cable or the contact connected to the charging cable is short circuited by
- charging a capacitor with the test voltage;
- applying the test voltage which is present on the capacitor to the charging cable;
- monitoring the voltage which is present on the charging cable for a predetermined period of time;
- detecting the short circuit when a voltage change which occurs during the period of time exceeds a predetermined threshold value;
- and
- detecting that there is no short circuit when the voltage change which occurs during the period of time does not exceed the predetermined threshold value.
An apparatus for detecting a short circuit in a charging cable which can be connected to an electrical charging device to charge a battery of an electric vehicle, comprising:
- a capacitor;
- and
- at least one processor programmed to control a method of
- choosing a first voltage value as a test voltage;
- applying the test voltage to the charging cable in testing whether the charging cable or a contact connected to the charging cable is short circuited;
- outputting a fault signal upon detection of a short circuit;
- increasing the test voltage in steps up to a maximum voltage value when no short circuit is detected while applying the test voltage, in testing whether the charging cable or the contact connected to the charging cable is short circuited;
- and
- determining whether the charging cable or the contact connected to the charging cable is short circuited by
- charging the capacitor with the test voltage;
- applying the test voltage which is present on the capacitor to the charging cable;
- monitoring the voltage which is present on the charging cable for a predetermined period of time;
- detecting the short circuit when a voltage change which occurs during the period of time exceeds a predetermined threshold value;
- and
- detecting that there is no short circuit when the voltage change which occurs during the period of time does not exceed the predetermined threshold value.
Dependencies are inferred from the claim text.