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Electric vehicle insulation resistance detection circuit and method

A technology of insulation resistance and detection method, which is applied in the direction of high resistance measurement, measurement of resistance/reactance/impedance, measurement devices, etc., can solve the problem of not meeting the real-time requirements of electric vehicles, being easily affected by external factors, and affecting insulation resistance. Monitor accuracy and speed and other issues to achieve the effect of improving accuracy and response speed, adjusting measurement cycle, and real-time measurement cycle

Active Publication Date: 2021-08-27
YANCHENG INST OF TECH
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Problems solved by technology

This unknown system parameter seriously affects the monitoring accuracy and speed of insulation resistance, which cannot meet the real-time requirements of electric vehicles; and no matter which measurement method is easily affected by external factors

Method used

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  • Electric vehicle insulation resistance detection circuit and method
  • Electric vehicle insulation resistance detection circuit and method
  • Electric vehicle insulation resistance detection circuit and method

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Embodiment Construction

[0128] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "first end" and "second end" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified, rather than indicating or implying that a particular orientation is necessary for referred elements, and thus should not be construed as limiting the invention. In the description of the present invention, it is specially stated: if the component is placed vertically in the circuit diagram, then "the first end of the component" means the upper end, then "the second end of the component" means the lower end; if This component is placed horizontally in the circuit diagram, then "the first end of the component" means the left end, then "the second end of the component" means the right end.

[0129] In the description of the prese...

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Abstract

The invention provides an electric vehicle insulation resistance detection circuit and method, and the method comprises the steps: 1, building a system dynamic model, carrying out the model parameter identification through a nonlinear least square method according to the step response, and calculating an insulation resistance value Rf1 and a system response period; 2, measuring insulation resistance according to a bridge method, performing parameter identification on the model by adopting a neural network, and calculating an insulation resistance value Rf2; and 3, when the difference value between the Rf1 and the Rf2 is smaller than a preset threshold value, taking a smaller insulation resistance value as a measured value Rf. The detection circuit comprises a dynamic model circuit and a bridge circuit. Compared with a traditional method, the detection time is shortened, and the real-time performance of insulation resistance detection is improved.

Description

technical field [0001] The invention relates to the technical field of electric vehicle electronic circuits, in particular to an electric vehicle insulation resistance detection circuit and method. Background technique [0002] The DC system of an EV is connected to many power electronic devices such as motor converters, battery chargers, air conditioners, DC-DC converters. When the electric vehicle is running, the overall connection forms a DC power micro-grid system. Because the voltage of the car circuit is much higher than the safety limit of the human body, when the insulation resistance between the high voltage and the car shell is low, people on the electric car are likely to be in danger of electric shock. The insulation failure of any equipment will affect the safety of the whole system. When the insulation resistance of the system drops below a threshold, the vehicle issues a warning signal. If the situation is serious, the high-voltage system must be cut off an...

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Application Information

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IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 李小凡李慧媛姚金泽何佳昊
Owner YANCHENG INST OF TECH
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