Secure on-board system for charging the battery of a motor vehicle from a power supply network

摘要

A secure system for charging a battery of a motor vehicle from a power supply network, which system is in a vehicle and includes a mechanism measuring frequency of the network, an injection mechanism injecting current pulses into the network, a mechanism measuring voltage between the ground and a neutral of the network, an analog filter filtering the measured voltages at high frequencies, a digital filter filtering the analog-filtered voltages at low frequencies, and a mechanism determining resistance between the ground and the neutral of the network on the basis of the digitally filtered voltages and an amplitude of the current pulses. The digital filter includes a mean value filter which determines a mean value based on N voltage measurements spaced apart by a time interval T+T/N, where T is the period of the network determined by the mechanism measuring the frequency of the network.

主权项

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.