High voltage loop relay adhesion diagnosis circuit and diagnosis method

A high-voltage circuit and diagnostic circuit technology, which is applied in circuit breaker testing, instrumentation, and electrical measurement, can solve problems such as relay adhesion that cannot be clearly judged by diagnostic technology

Active Publication Date: 2019-01-04
HAIMA AUTOMOBILE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-voltage circuit relay adhesion diagnosis circui...

Method used

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  • High voltage loop relay adhesion diagnosis circuit and diagnosis method
  • High voltage loop relay adhesion diagnosis circuit and diagnosis method
  • High voltage loop relay adhesion diagnosis circuit and diagnosis method

Examples

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Embodiment

[0052] figure 1 It is a schematic structural diagram of the high voltage loop relay adhesion diagnosis circuit 100 in the embodiment of the present invention. The high-voltage circuit relay adhesion diagnosis circuit 100 in this embodiment can be used to perform adhesion diagnosis on various on-off control relays of the high-voltage circuit L0 (such as the starting circuit) of an electric vehicle, for example.

[0053] figure 2 It is a schematic diagram of the high-voltage circuit L0 of the electric vehicle and the connected load M0. see figure 2 , the high-voltage circuit L0 includes a battery pack B1, a main positive relay Re_p connected to the positive pole of the battery pack B1, a pre-charging circuit L10 connected in parallel to the main positive relay Re_p, and a main negative relay Re_n connected to the negative pole of the battery pack B1; The pre-charging circuit L10 includes a pre-charging relay Re_pre and a pre-charging resistance R_pre connected in series; on...

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Abstract

The invention relates to the circuit detection field. In the prior art, a diagnostic technology can not be used to clearly determine which relay is adhesive. The invention aims at solving the above problem and provides a high voltage loop relay adhesion diagnosis circuit and a diagnosis method. The diagnosis circuit of the high voltage loop relay adhesion diagnosis circuit comprises a first voltage detection branch, a second voltage detection branch, a third voltage detection branch, a fourth branch and a fifth branch. The fourth branch is connected between a U_pl potential point and a whole vehicle grounding position GND. The fourth branch comprises a switch device SW_pg and an insurance device F_pg which are connected in series. The fifth branch is connected between the U_pl potential point and the module group grounding position GND_Mn of a whole vehicle. The fifth branch comprises a switch device SW_pm and an insurance device F_pm which are connected in series. The diagnosis circuit also comprises a signal detection unit. The signal detection unit is used for detecting the electric signal of the fifth branch. By using the diagnosis circuit and the diagnosis method of the invention, whether relay adhesion exists and/or which relay is adhesive can be clearly diagnosed and acquired.

Description

technical field [0001] The invention relates to the field of circuit detection, in particular to a high-voltage circuit relay adhesion diagnosis circuit and a diagnosis method. Background technique [0002] In electric vehicles, the relay is used to control the opening and closing of the high-voltage circuit. In order to ensure the safety of the high-voltage circuit, it is necessary to detect whether the relay is stuck before closing the relay. The technology used here is relay diagnostic technology. [0003] However, there is at least one defect in the existing diagnostic technology: it is impossible to clearly determine which relay is stuck; when diagnosing the main and negative relay sticking, it is necessary to close the pre-charging relay, which will lead to disconnection during the diagnosis process. The risk of the external high-voltage circuit; the circuit design is complex, and the requirements for the switching devices on the branch are strict. Contents of the in...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/3275
Inventor 刘勇张俊蒋锋刘珂王明林
Owner HAIMA AUTOMOBILE CO LTD
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