Device and method for estimating the resistance of the ground connection for an electrical apparatus
AssigneeRENAULT s.a.s.
InventorsChristophe Ripoll, Pascal Caumon
Life of this patent
Estimating the term…
Abstract
A device and method for estimating resistance of a ground connection of an electrical apparatus connected to an electrical power network, also connected to ground by an additional resistance, and including at least one impedance disposed at an input of the electrical apparatus, a voltage generator connected to the impedance and connected to ground, a mechanism to measure current flowing to ground, and a calculation mechanism to estimate the resistance of the ground connection as a function of the current flowing to ground. The device and method can for example find application in estimation of resistance of a ground connection of a charger of an electric or hybrid traction motor vehicle.
Claims14
1-13. (canceled)
A device for estimating resistance of a ground connection for an electrical apparatus when the electrical apparatus is connected to a power supply system and is also connected to the ground by an additional resistance, the electrical apparatus including at least one input impedance, the estimating device comprising:
- a voltage generator including means for connecting to the input impedance and means for connecting to the ground connection;
- means for measuring current flowing to the ground through the resistance of the ground connection when the means for connecting to the input impedance and to the ground connection are activated;
- and
- calculating means configured to obtain an order of magnitude for the resistance of the ground connection, as a function of the current flowing to the ground, with respect to a value of the additional resistance.
A method for estimating resistance of a ground connection for an electrical apparatus when the electrical apparatus is connected to a power supply system and is also connected to the ground by an additional resistance, the estimation method comprising:
- generating a current between an input impedance of the electrical apparatus and the resistance of the ground connection;
- and
- measuring current flowing to the ground through the resistance of the ground connection to obtain an order of magnitude for the resistance of the ground connection with respect to a value of the additional resistance.
Dependencies are inferred from the claim text.