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Insulation-degradation detecting device

A technology of deterioration detection and electrical insulation, applied in the direction of measuring device, electrical device, measuring electricity, etc., can solve problems such as electric shock, and achieve the effect of shortening the duration

Active Publication Date: 2012-02-01
PUES
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when the material of the battery box deteriorates or the insulating properties of the attached material deteriorate, the leakage current flowing from the high-voltage DC power supply to the vehicle body is transmitted to people who come into contact with the vehicle body, and there is a risk of electric shock.

Method used

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Embodiment Construction

[0059] Embodiments of the insulation deterioration detection device of the present invention will be described below with reference to the drawings. First, before describing the structure of an insulation degradation detection device according to an embodiment of the present invention, by figure 1 An overall configuration composed of the insulation deterioration detection device 10 and the high-voltage circuit 15 for an electric vehicle will be described.

[0060] figure 1 The shown high-voltage circuit 15 is composed of a lithium-ion battery, a high-voltage DC power supply 16, a main switch 17, a frequency converter 18, and an AC motor 19. high voltage.

[0061] The measurement circuit 12 is connected to a 12V power supply used in ordinary automobiles including electric automobiles, and outputs an alarm signal when insulation deterioration is detected or when the insulation resistance value is below a predetermined value. Even if the insulation resistance value is detected...

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Abstract

Disclosed is an insulation-degradation detecting device without having a problem of voltage drift capable of quickly returning to a measurable state even when a disturbance voltage is applied. Since current injection to a fixed voltage and current drawing to a fixed voltage are performed, the problem of voltage drift does not occur even when there is an imbalance between injected current and drawn current. Moreover, even when a high disturbance voltage is applied from a side of an insulating capacitor adjacent to a DC power source, current drawing (or current injection) to the fixed voltage is performed during a cycle immediately after the disturbance voltage application, resulting in quick return to the original measurable state.

Description

technical field [0001] The present invention relates to an insulation deterioration detection device that detects insulation deterioration between a vehicle body of an electric vehicle, etc., having, for example, a DC power supply electrically insulated from the vehicle body (hereinafter, sometimes referred to as a high-voltage DC power supply for convenience of explanation) , but there is no limit on how many volts above). Background technique [0002] Generally, in an electric vehicle (or a so-called hybrid vehicle) that uses a high-voltage DC power supply such as a lithium-ion battery or a supercapacitor battery as a driving energy source, in order to prevent electric shock, a high-voltage DC power supply and a body voltage at ground potential are formed. Insulated open plan. However, when the material of the battery box deteriorates or the insulating properties of the attached material deteriorate, the leakage current flowing from the high-voltage DC power supply to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02B60L3/00G01R27/18G01R31/36
CPCB60L3/0023G01R31/1227
Inventor 德田博厚深泽保福田哲夫
Owner PUES
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