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Device and method for estimating touch currents and protecting electrical installations from such touch currents

A technology for touching current and electrical devices, which can be applied to electrical devices, battery circuit devices, and electrical devices in testing and transportation, etc., and can solve problems such as increasing leakage current that cannot be considered.

Inactive Publication Date: 2016-11-16
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Current limiting solutions have the disadvantage that increases in leakage current cannot be accounted for
The leakage current limiting system may therefore not keep the touch current on the chassis below 3.5mA

Method used

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  • Device and method for estimating touch currents and protecting electrical installations from such touch currents
  • Device and method for estimating touch currents and protecting electrical installations from such touch currents
  • Device and method for estimating touch currents and protecting electrical installations from such touch currents

Examples

Experimental program
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Embodiment Construction

[0030] figure 1 The principle of the generation of leakage currents in an electric vehicle to which a non-galvanically isolated battery charger is connected is shown.

[0031] It should be noted, however, that this principle applies to any type of device, any type of battery charger, or obviously other types of motor vehicles (with electric and hybrid drive systems) where touch currents can flow through the device when an individual touches the body of the vehicle. Appears after the connection.

[0032] In this figure, reference numeral 1 designates the vehicle as a whole and reference numeral 2 designates an electrically conductive structure of the vehicle, which in this case is the body of the vehicle.

[0033] As shown, in this case the electric motor vehicle 1 is equipped with a charger 3 and furthermore contains a battery and a set of electric drive systems not shown in this figure.

[0034] Naturally, the vehicle 1 can also be fitted with numerous additional components...

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PUM

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Abstract

The invention relates to the protection of an electrical device (3) against touch currents, said device (3) being intended to be connected between a power source and on-board equipment of a motor vehicle (1). It implements a circuit (9) for detecting leakage currents and for estimating touch currents, a circuit for measuring frame currents ( 14) and means (11) for controlling the operation of the device (3) depending on the estimated level of touch current and the measured level of frame current. The invention may be used to protect against leakage currents during recharging of hybrid or electrically driven motor vehicles.

Description

technical field [0001] The present invention relates to the protection of electrical devices from leakage currents, and more particularly to the protection of battery chargers of electric vehicles from leakage currents that occur when the charger is connected to the electricity distribution network. Background technique [0002] The chargers used in some electric motor vehicles are not isolated. Each element of the charger has a common-mode capacitance with respect to the chassis. During connection to the power distribution network, voltages applied to these various components will cause earth leakage currents through these capacitances. [0003] When these ground leakage currents occur, they can create differential protection against residual currents that can interrupt the charging process. [0004] If a user touches the body of an electric vehicle during charging, if there is a ground defect of the vehicle, the ground leakage current becomes a current known as a "touch"...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L3/00G01R31/00
CPCB60L3/00G01R31/006H02H3/16G01R31/52H02J7/00
Inventor O·普罗伊科斯C·里波尔
Owner RENAULT SA