Patent ID: 11906599
Assignee: SANYO ELECTRIC CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC G  B  H | IPC B  G  H

Claim 0:
1. An earth leakage detecting device comprising:
a coupling capacitor including a first end that is connected to a current path of a power storage, the power storage being connected to a load and insulated from a ground;
a voltage output unit that generates a periodic voltage that changes periodically, the voltage output unit applying the periodic voltage to a second end of the coupling capacitor via an impedance element;
a voltage measurer that measures a voltage at a connection point between the coupling capacitor and the impedance element; and
an earth leakage determiner that makes determination whether or not an earth leakage has occurred based on the voltage measured by the voltage measurer between the current path of the power storage and the ground, wherein
the voltage output unit is provided with (i) a preparation period in which the voltage output unit constantly outputs a potential between a high-side potential and a low-side potential of the periodic voltage, and (ii) a measurement period in which the voltage output unit outputs the periodic voltage, the preparation period being prior to the measurement period,
the earth leakage determiner sets a voltage measured in the preparation period to a reference potential, and
the earth leakage determiner uses at least one of a first peak value or a second peak value in the determination made by the power storage, the first peak value being indicated by a difference between an upper peak value of a voltage waveform measured in the measurement period and the reference potential, the second peak value being indicated by a difference between the reference potential and a lower peak value of the voltage waveform measured in the measurement period.