US 12,072,393 B2
Leakage detection device and power system for vehicle
Masato Nakayama, Hyogo (JP); and Taisuke Hamada, Hyogo (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/621,177
Filed by SANYO Electric Co., Ltd., Osaka (JP)
PCT Filed Jun. 15, 2020, PCT No. PCT/JP2020/023448
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2020/262084, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-121505 (JP), filed on Jun. 28, 2019.
Prior Publication US 2022/0357408 A1, Nov. 10, 2022
Int. Cl. G01R 31/52 (2020.01); B60L 3/00 (2019.01)
CPC G01R 31/52 (2020.01) [B60L 3/0046 (2013.01); B60L 3/0069 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A leakage detection device comprising:
in a state of being insulated from a ground, a coupling capacitor including a first end connected to a current path of a power storage unit connected to a load;
a voltage output unit configured to generate a periodic voltage that periodically changes to apply the periodic voltage to a second end of the coupling capacitor via an impedance element;
a voltage measurement unit configured to measure a voltage at a node between the coupling capacitor and the impedance element; and
a leakage determination unit configured to determine whether or not a leakage has occurred between a current path of the power storage unit and the ground based on a peak-to-peak value between an upper peak value and a lower peak value of a voltage waveform of the voltage measured by the voltage measurement unit,
wherein the leakage determination unit estimates at least one of an upper peak value and a lower peak value at a certain time, and calculates the peak-to-peak value between the upper peak value and the lower peak value with virtually aligned time axis.