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Fault detection method for detecting leakage paths between power sources and chassis

A fault detection and chassis technology, applied in the direction of measuring electricity, electrical devices, measuring electrical variables, etc., can solve the problem of detection node short circuit cannot be detected

Active Publication Date: 2014-11-12
MAXIM INTEGRATED PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a short circuit across the sense node of the Wheatstone bridge may not detect

Method used

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  • Fault detection method for detecting leakage paths between power sources and chassis
  • Fault detection method for detecting leakage paths between power sources and chassis
  • Fault detection method for detecting leakage paths between power sources and chassis

Examples

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Embodiment Construction

[0020] figure 1 is a schematic diagram of a high voltage DC electrical system employing the exemplary fault detection system 100 . For example, the system 100 may be employed in an electric vehicle 102 (driven by an electric motor 104 and powered by a battery or battery pack 106 ), such as a golf cart or an automobile. System 100 may also be employed in gasoline-electric hybrid or other types of hybrid electric devices or machines. These systems typically operate at higher voltages, such as 100 to 1000 volts or higher. As shown, a detection module 108 , described in more detail below, is connected to the positive terminal of the battery 106 through a first switch 110 and a first resistor 112 . The detection module 108 is also connected to the negative terminal of the battery 106 through a second switch 116 and a second resistor 118 . As optionally shown, the first switch 110 and the second switch 116 may be combined as a single pole double throw type switch or relay 113 . ...

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Abstract

A method of detecting a ground fault condition between a direct current power system and the chassis ground of an electric or hybrid-electric vehicle is provided. The method includes sequentially opening and closing a first switch connected between a positive node of the direct current power system and the chassis ground of the vehicle and a second switch connected between a negative node of direct current power system and the chassis ground. The sequential opening and closing of the first and second switches charges and discharges an inherent capacitance present between the metal components of the direct current power system and the chassis. First and second currents are created as the inherent capacitance is charged and discharged. Measurements of the created first and second currents are then used to determine whether a ground fault condition exists between the direct current power system and the vehicle chassis ground.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 61 / 152,905, filed February 16, 2009, entitled "Fault Detection Method for Detecting Leakage Paths Between Power Sources and Chassis," the specification of which is adopted by References are included here. technical field [0003] The following disclosure relates to electrical fault detection systems and methods for high voltage DC systems. Background technique [0004] A number of factors, including rising energy prices, environmental concerns and the development of new battery technologies, have fueled interest in electric vehicles. "Plug-in" electric vehicles rely solely on battery-powered electric motors to propel the vehicle. "Hybrid" vehicles use a combination of electric drive motors and gasoline or diesel fueled engines to achieve higher mileage. [0005] Plug-in and hybrid vehicles typically use high-voltage DC drives powered by large batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R19/00G01M17/00
CPCG01R31/007B60L3/0069G01R31/025B60L3/0023G01R31/52
Inventor M·普拉亘斯B·弗里兹
Owner MAXIM INTEGRATED PROD INC
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