Patent ID: 9599650
Date: 2017-03-21
CPC Classifications: B60L,G01R,H02J,Y02T,Y04S

Claim:
1. A secure system for charging a battery of a motor vehicle from a power supply network, the system being on board the motor vehicle and comprising: means for measuring frequency of the power supply network; means for injecting current pulses into the power supply network; means for measuring voltage between ground and a neutral of the power supply network; an analog filter for filtering the measured voltages at high frequencies; a digital filter for filtering the analog-filtered voltages at low frequencies; and means for determining resistance between the ground and the neutral of the power supply network on the basis of the digitally filtered voltages and an amplitude of the current pulses; wherein the digital filter comprises a mean value filter determining a mean value on the basis of N voltage measurements spaced apart by a time interval T+T/N, with N being a number of voltage measurements and T being the period of the power supply network determined by the means for measuring the frequency of the power supply network.