System and method for secure charging of a motor vehicle battery

摘要

A system and method for secure charging of a motor vehicle battery including the steps of secure charging of the battery of a motor vehicle from a network estimating the resistance between the earth and the neutral of the network, including at least one injection of pulses of current into the network, measurements of voltage between the earth and the neutral of the network in response to each pulse, and a determination of the earth resistance from the measured voltages. Each injection of current pulses into the network includes the injection of a first positive pulse followed by a second negative pulse, the first and the second pulses having an equal intensity in terms of absolute value and being separated by a sufficiently short interval for a stray capacitor coupled to the network to be further charged during the second pulse.

主权项

1. A secure system for charging of a battery of a motor vehicle from a supply network, the system being installed in the motor vehicle and comprising:
means for injecting current pulses into the supply network; and means for measuring a voltage between a ground and a neutral of the supply network, wherein the pulse injection means are configured so that each injection of current pulses into the supply network comprises the injection of a positive first pulse followed by a negative second pulse, the first and second pulses having an equal strength in absolute value and being separated by an interval which is sufficiently short for a parasitic capacitance coupled to the supply network to be still charged during the second pulse, and the system comprises means of determining the ground resistance on the basis of the amplitude of the current pulses and voltages measured for the first pulse and the second pulse of each pulse injection.