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Insulation detection circuit

A technology for detecting circuit and insulation resistance, which is applied in the direction of measuring electrical variables, testing dielectric strength, and testing electrical devices in transportation, etc. The effect of speed and accuracy, fast measurement speed and simple circuit

Pending Publication Date: 2017-11-07
OPTIMUM BATTERY CO LTD
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Problems solved by technology

[0003] The existing insulation detection schemes are generally unbalanced bridge method and low-frequency injection method, but the error of unbalanced bridge method is relatively large, while the low-frequency injection method has complex circuits, slow measurement speed, large amount of calculation, and relatively high cost

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Embodiment Construction

[0015] In order to make the objectives, technical solutions, and beneficial technical effects of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present invention, not for limiting the present invention.

[0016] When an element is considered to be "connected" to another element, it may be directly connected to the other element or an intermediate element may be present at the same time. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present inven...

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PUM

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Abstract

An insulation detection circuit, comprising a battery pack, a first insulation resistance, a second insulation resistance, a voltage generator, a resistor network and a micro-control unit; the positive end of the battery pack is connected to the first end of the first insulation resistance, and the battery pack The negative end of the first insulation resistance is connected to the first end of the second insulation resistance; the second end of the first insulation resistance is connected to the second end of the second insulation resistance, the second end of the first insulation resistance is connected to the second end of the second insulation resistance The point where the two ends are connected is the first connection point, and the first connection point is connected to the electric vehicle body; one end of the voltage generator is connected to the first connection point, and the other end is connected to the resistor network, and the voltage generator generates the first voltage and The second voltage, the direction of the first voltage and the second voltage are opposite; the resistance network is also respectively connected to the first end of the first insulation resistance and the first end of the second insulation resistance, and the resistance network is further connected to the micro control unit.

Description

【Technical Field】 [0001] The invention relates to the technical field of electric vehicles, in particular to an insulation detection circuit. 【Background technique】 [0002] At present, the rapid development of new energy electric vehicles can solve the problems of oil and gas non-renewable energy and environmental pollution. However, with the increasing endurance of new energy electric vehicles, the voltage and capacity of the battery packs on electric vehicles are also getting higher and higher. At present, the battery pack voltage of electric vehicles reaches more than 300V, which far exceeds the safety voltage of the human body and involves personal safety. Therefore, the insulation leakage detection between the battery pack and the electric vehicle body is a key safety issue. [0003] The existing insulation detection schemes are generally the unbalanced bridge method and the low frequency injection method, but the unbalanced bridge method has a large error, and the low frequ...

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Application Information

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IPC IPC(8): G01R31/12G01R27/02
CPCG01R31/12G01R27/025G01R31/006
Inventor 汪永祥陈贵华饶睦敏李瑶
Owner OPTIMUM BATTERY CO LTD
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