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A high voltage direct current insulation monitoring device and electric vehicle

An insulation monitoring device, a high-voltage DC technology, applied in the measurement device, measuring electrical variables, testing dielectric strength and other directions, can solve the problems of vehicle impedance network interference, inability to achieve dynamic monitoring, low monitoring accuracy, etc., to achieve anti-interference ability Strong, real-time monitoring, good compatibility

Active Publication Date: 2017-01-04
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the more mature technical solutions for high-voltage DC insulation monitoring of electric vehicles are only suitable for static monitoring. Although the solution is simple and low in cost, it cannot achieve dynamic monitoring, making its monitoring accuracy low and vulnerable to False alarms due to vehicle impedance network interference

Method used

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  • A high voltage direct current insulation monitoring device and electric vehicle
  • A high voltage direct current insulation monitoring device and electric vehicle
  • A high voltage direct current insulation monitoring device and electric vehicle

Examples

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Embodiment 1

[0043] Such as figure 1 As shown, this embodiment provides a high-voltage DC insulation monitoring device for real-time monitoring of the value of the insulation resistance Rs of the DC bus of the high-voltage DC system to the reference ground, which includes: two current limiting resistors Ri1 and Ri2, and a sampling resistor Rm , a matching resistor Rp, a signal generating unit, a control unit and a power supply unit; the control unit includes an instruction subunit, a sampling subunit and a calculation subunit.

[0044] Wherein, the two current-limiting resistors Ri1 and Ri2 have the same structure, and are connected in series between the positive and negative poles of the DC bus; one end of the sampling resistor Rm is connected to the series node of the two current-limiting resistors Ri1 and Ri2, and the other end Connected to the sampling sub-unit of the control unit; one end of the matching resistor Rp is connected to the series node of two current limiting resistors Ri1...

Embodiment 2

[0064] Such as image 3 As shown, this embodiment provides a high-voltage DC insulation monitoring device applied to electric vehicles, which is used to monitor the value of the insulation resistance Rs between the power battery (ie, battery pack) and the electric chassis in the high-voltage DC system of the electric vehicle in real time, The high voltage DC insulation monitoring device includes: two current limiting resistors Ri1 and Ri2, sampling resistor Rm, matching resistor Rp, signal generating unit, sampling processing unit, high voltage sampling unit, control unit, flyback DCDC converter and power supply unit ; each of the current-limiting resistors includes a plurality of sub-resistances connected in series; the control unit includes an instruction subunit, a sampling subunit and a calculation subunit.

[0065] Wherein, the two current-limiting resistors Ri1 and Ri2 have the same structure, and are connected in series between the positive and negative poles of the power...

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Abstract

The invention provides a high-voltage DC insulation monitoring device for monitoring the insulation resistance value of a high-voltage DC bus to a reference ground in real time. The device comprises two current-limiting resistors, a sampling resistor, a coupling resistor, a signal generation unit, a control unit and a power source unit, wherein the ontrol unit comprises an instruction subunit, a sampling subunit and a calculating subunit; the instruction subunit is used for outputting a control instruction to the signal generation unit; the signal generation unit is used for outputting a low-frequency measuring signal after receiving the control instruction; the low-frequency measuring signal respectively, after traveling through the coupling resistor, an insulation resistor and the two current-limiting resistors, returns to the signal generation unit through a sampling resistor flow; the sampling subunit is used for performing analog-to-digital conversion on the voltage signal of the sampling resistor; and the calculating subunit is used for calculating a conversion result to obtain the insulation resistance value. Correspondingly provided is an electric automobile. The high-voltage DC insulation monitoring device can dynamically monitor the insulation performance of the electric automobile in real time.

Description

technical field [0001] The invention relates to the technical field of insulation monitoring of a high-voltage direct current system, in particular to a high-voltage direct current insulation monitoring device and an electric vehicle including the high-voltage direct current insulation monitoring device. Background technique [0002] With the global auto industry facing the huge challenges of financial crisis, energy crisis and environmental protection, it has formed a broad international consensus to develop electric vehicles, realize the electrification of vehicle energy and power systems, and promote the strategic transformation of the traditional auto industry. At present, my country has introduced many policies to support and guide the rapid development of the electric vehicle industry, so as to accelerate the improvement of the competitiveness of the domestic electric vehicle industry and shorten its maturity period. [0003] Electric vehicles are complex mechatronics ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R27/14
Inventor 杨涛
Owner 奇瑞新能源汽车股份有限公司
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