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Electric vehicle power battery insulation resistor monitoring device based on amplitude-phase detection principle

A technology of insulation resistance and electric vehicles, which is applied in the direction of high resistance measurement, measuring devices, measuring resistance/reactance/impedance, etc., and can solve problems such as damage detection systems and battery packs, reduced system reliability, and unsatisfactory application effects , to achieve the effect of reducing damage and improving the detection accuracy of the system

Pending Publication Date: 2018-02-23
UNIV OF SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that frequent high-voltage charging and discharging will definitely damage the detection system and battery pack, thereby reducing the reliability of the system
[0005] Therefore, the actual application effect of the above detection scheme is not ideal.

Method used

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  • Electric vehicle power battery insulation resistor monitoring device based on amplitude-phase detection principle
  • Electric vehicle power battery insulation resistor monitoring device based on amplitude-phase detection principle
  • Electric vehicle power battery insulation resistor monitoring device based on amplitude-phase detection principle

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] An electric vehicle power battery insulation resistance monitoring device based on the principle of amplitude and phase detection of the present invention has a structure such as figure 1 As shown, it includes: a sine wave generation circuit 1 , a feedback signal sampling circuit 2 , a sinusoidal AC signal amplitude detection circuit 3 , a feedback signal amplitude detection circuit 4 , and a phase difference measurement circuit 5 .

[0046] The sine wave generating circuit is used to generate a sine signal as a signal source of the system, and inject the generated sine signal into the chassis of the vehicle through the injection circuit.

[0047] Specifically, the sine wave generating circuit is used for generating sine signals, and is composed of an amplifier circuit, a positive feedback circuit, a frequency selection network, and an a...

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Abstract

The invention discloses an electric vehicle power battery insulation resistor monitoring device based on an amplitude-phase detection principle. The electric vehicle power battery insulation resistormonitoring device comprises a sinusoidal wave generating circuit, a feedback signal sampling circuit, a sinusoidal alternating current signal amplitude detection circuit, a feedback signal amplitude detection circuit and a phase difference measuring circuit, wherein the sinusoidal wave generating circuit is used for generating sinusoidal alternating current signals to serve as a signal source of the system; the feedback signal sampling circuit is used for feeding signals back to a sampling system; the sinusoidal alternating current signal amplitude detection circuit is used for detecting the sinusoidal alternating current signal amplitude; the feedback signal amplitude detection circuit is used for detecting the feedback signal amplitude; the phase difference measuring circuit is used fordetecting the phase difference between the feedback signals and the sinusoidal alternating current signals. After a control unit obtains the measurement signals, insulation resistance is calculated through an insulation resistor calculation formula. The electric vehicle power battery insulation resistor monitoring device can conduct detection in real time, the influence of stray capacitance on a detection result is removed, and the detection precision of the system is improved.

Description

technical field [0001] The invention relates to the technical field of monitoring the insulation resistance of a power battery, in particular to a monitoring device for the insulation resistance of a power battery of an electric vehicle based on the principle of amplitude and phase detection. Background technique [0002] In order to meet the power demand of electric vehicles, the battery pack voltage of electric vehicles is basically above hundreds of volts. Therefore, in order to ensure the personal safety of the passengers and the reliable operation of the system, it is necessary to monitor the insulation resistance of the positive and negative electrodes of the battery pack to the ground in real time. [0003] Patent No. 201210425994.2 discloses a DC insulation monitor, which is a measurement scheme combining a Hall current sensor and a bridge. The Hall current sensor is used to detect the leakage current of the DC bus to ground, and the access resistance is switched to ...

Claims

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Application Information

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IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 陈宗海田佳强张旭于晓玮李锡云
Owner UNIV OF SCI & TECH OF CHINA
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