Insulation resistance detecting device for high-voltage circuit

Abstract

The invention belongs to the technical field of circuit diagnosis, and particularly relates to an insulation resistance detecting device for a high-voltage circuit. The detecting device comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, a second switch, an induction band and a diagnosis circuit. The diagnosis circuit comprises a diagnosis signal generating circuit, a diagnosis signal receiving circuit and a monitoring unit. The induction band is wound on a high-voltage line, so that the electric leakage condition of a positive electrode or a negative electrode of the high-voltage line and the short circuit condition of the high-voltage line are detected quantificationally, in the electric leakage detecting process, electric leakage information can be sent out to a control system or a display system of an electric vehicle through a CAN line, and thus a prompting function or a warning function can be achieved. According to the electric leakage detecting device and a detecting method thereof, a non-contact detecting method is adopted, and the detected high-voltage line cannot be affected.

Description

technical field [0001] The invention belongs to the technical field of circuit diagnosis, and in particular relates to a high-voltage circuit insulation resistance detection device. Background technique [0002] The DC voltage of the existing electric vehicle storage battery reaches more than 300V. If a leakage occurs, it may cause damage to electrical appliances, spontaneous combustion of electric vehicles, or even burns or injuries to the human body; how to detect the leakage of high-voltage lines in time is a problem that must be solved in the promotion of electric vehicles. [0003] There are two existing detection methods for detecting the insulation resistance of high-voltage circuits, namely the AC method and the non-insulated DC method. The AC method detects the leakage resistance by applying a signal to the vehicle body target, and uses capacitors and transformers to insulate the vehicle body from the DC current. For example, the patent application number 200680025...

AI Technical Summary

Problems solved by technology

If leakage occurs, it may cause damage to electrical appliances, spontaneous combustion of electric vehicles, or even burns or injuries to the human body; how to detect the leakage of high-voltage lines in time is a problem that must be solved in the promotion of electric vehicles

[0003] There are two existing detection methods for detecting the insulation resistance of high-voltage circuits, namely the AC method and the non-insulated DC method. The AC method detects the leakage resistance by applying a signal to the vehicle body target, and uses capacitors and transformers to insulate the vehicle body from the DC current. For example, the patent application number 200680025396.9 provides a method for detecting leakage using an AC signal; the non-insulated direct current method does not use capacitors and transformers, but applies leakage resistance to direct current to measure leakage conditions, such as the patent application number 200510073896.7 provides a method for measuring leakage resistance, but the disadvantage of these two existing leakage detection methods is that the detection circuit is connected with the detection object, which will have an impact on the detection object

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