Apparatus for detecting fault of power relay of inverter
AssigneeLsis Co., Ltd.
InventorJu-Beom Son
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Abstract
An apparatus for detecting a fault in a power relay of an inverter is disclosed. The apparatus for detecting a fault in a power relay includes: a voltage sensor configured to measure a voltage of a DC link; a current sensor configured to measure an output current applied to an inverter stage; a storage unit configured to store resistance of an initial charge resistor, a time constant of a capacitor, and a reference voltage measured when voltage drop of the DC link does not occur; and a controller configured to determine, when the voltage drop of the DC link occurs, the presence or absence of a fault in the power relay based on a difference between the reference voltage and a voltage measured after lapse of a period corresponding to the time constant.
Claims11
An apparatus for detecting a fault in a power relay of an inverter, the apparatus comprising:
- a voltage sensor configured to measure a voltage of a DC link;
- a current sensor configured to measure an output current to an inverter stage;
- a storage unit configured to store a resistance of an initial charge resistor, a time constant of a capacitor, and a reference voltage measured when no voltage drop occurs at the DC link;
- and
- a controller configured to determine, when the voltage drop occurs at the DC link, whether there is the fault in the power relay based on a difference between the reference voltage and a voltage measured after a period of time corresponding to the time constant has elapsed,
- wherein the controller compares the difference between the voltages with a voltage drop determined by the output current and the resistance, thereby determining whether there is the fault in the power relay.
Dependencies are inferred from the claim text.