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Insulation resistance detection circuit and detection method

A technology for detecting circuit and insulation resistance, which is applied in the fields of energy and electric vehicles, can solve problems such as inaccurate insulation resistance detection, and achieve the effect of eliminating static errors

Active Publication Date: 2020-04-28
XIAN TELD LINCHR NEW ENERGY TECH CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, provide an insulation resistance detection circuit and detection method, and solve the problem of inaccurate insulation resistance detection in the prior art

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  • Insulation resistance detection circuit and detection method
  • Insulation resistance detection circuit and detection method
  • Insulation resistance detection circuit and detection method

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Embodiment Construction

[0065] The present invention is described in further detail below in conjunction with accompanying drawing:

[0066] see figure 1 and figure 2 , the present invention provides an embodiment of an insulation resistance detection circuit, that is, an embodiment of an insulation resistance detection circuit for sampling impedance of a self-correcting system. The detection circuit includes a measured system ground impedance 1, a grounding relay 2, a sampling circuit Equivalent impedance to sampling reference ground 3, DC+ to sampling reference ground voltage sampling circuit 4, DC+ to sampling reference ground switching component 5, DC- to sampling reference ground switching component 6, and voltage sampling between DC+ and DC- Circuit 7.

[0067] Among them, the ground impedance 1 of the system under test includes positive ground impedance Rx and negative ground impedance Ry in series, one end of the positive ground impedance Rx is connected to DC+, one end of the negative gro...

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Abstract

The invention discloses an insulation impedance detection circuit and a detection method. The detection circuit includes the ground impedance of the measured system, a grounding relay, a sampling circuit equivalent impedance to the sampling reference ground, a DC+ voltage sampling circuit to the sampling reference ground, a DC+ Switching components for sampling reference ground, DC- switching components for sampling reference ground, and voltage sampling circuit between DC+ and DC-; the invention first detects the equivalent impedance of the sampling circuit to ground before the insulation impedance detection; When bringing the equivalent impedance into the detection algorithm, the automatic correction method is used to eliminate the static error caused by the system difference, and the sampling balance resistor is dynamically switched according to the external impedance to solve the problem of the insulation resistance detection when the single-ended ground impedance is infinite. accurate phenomenon.

Description

【Technical field】 [0001] The invention belongs to the technical field of energy and electric vehicles, and relates to an insulation impedance detection circuit and a detection method. 【Background technique】 [0002] With the popularity of electric vehicles, charging safety, especially the safety of DC charging, has become the focus of attention. The national standard has also clearly stipulated that before DC charging of electric vehicles, the charging pile and the vehicle must be tested for insulation resistance before DC charging. If the detected insulation resistance value is less than the specified threshold, charging should be prohibited to prevent ground leakage. personal injury or equipment damage. [0003] The detection parameters of the conventional insulation resistance detection circuit are generally solidified in the algorithm, but because the sampling device has different degrees of static errors when it leaves the factory, static errors will be introduced when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 陈磊袁庆民茹永刚
Owner XIAN TELD LINCHR NEW ENERGY TECH CO LTD
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