Patent ID: 11971458
Assignee: SANYO ELECTRIC CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  B  H | IPC B  G

Claim 0:
1. An electrical fault detection device comprising:
a first coupling capacitor including a first terminal directly connected to a first connection point on a current path of a power storage, the power storage being in a state of being insulated from a ground;
a second coupling capacitor including a second terminal directly connected to a second connection point on a current path of the power storage, the second connection point being lower in potential than the first connection point, the second coupling capacitor including a first terminal connected to a second terminal of the first coupling capacitor;
an alternating (AC) current output unit configured to apply a predetermined AC voltage via an impedance element to a third connection point between the second terminal of the first coupling capacitor and the first terminal of the second coupling capacitor;
a voltage measurement unit configured to measure a voltage at the third connection point; and
a determination unit configured to determine whether or not the current is leaked, based on a voltage measured by the voltage measurement unit,
wherein the first connection point is a positive electrode of the power storage,
the second connection point is a negative electrode of the power storage, and
the power storage includes only a plurality of cells connected in series.