Insulation detection method based on low frequency impulse signal injection

A low-frequency pulse and detection method technology, applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of inaccurate detection, lower insulation performance of the whole vehicle, and inability to locate insulation fault points, etc., to achieve reduction effect of influence

Inactive Publication Date: 2013-05-01
JIANGSU ALFA BUS
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Problems solved by technology

[0014] In order to overcome the deficiencies of the prior art above, the present invention provides an insulation detection method based on low-frequency pulse signal injection, aiming at reducing the AC interference signal brought by the detection method to the electrical system, and avoiding the reduction caused by other detection methods. The insulation performance of the whole vehicle cannot locate the insulation fault point, the structure is complex, the circuit accuracy is high, and the leakage of positive and negative electrodes cannot be accurately detected at the same time.

Method used

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  • Insulation detection method based on low frequency impulse signal injection
  • Insulation detection method based on low frequency impulse signal injection

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Embodiment Construction

[0020] We believe that the positive and negative poles of the system under test have a fixed insulation resistance to the ground. The total positive and negative ends of the whole vehicle battery pack are tested using a circuit example of this method respectively. The total positive and negative ends of the battery pack use capacitors. C1 is isolated from the detection system. Such as figure 1 As shown, this measurement method is connected to the overall positive terminal HV+ of the vehicle battery pack and ground; the CPU injects the pulse signal fIRPLUSE into the detection circuit through the port IROSC, and makes the capacitor C2 generate a low frequency through the oscillation circuit composed of R1, C1 / R2, and C2. AC signal, the signal is input to the IRSENS port of the CPU via a follower circuit composed of an operational amplifier and a resistor as a feedback signal. The waveform diagram of the injection signal and the feedback signal is as follows figure 2 Shown.

[002...

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Abstract

The invention discloses an insulation detection method based on low frequency impulse signal injection. Low frequency impulse signal injection is adopted to detect an insulating performance of a whole vehicle, and a capacitor is adopted to separate a high-voltage current from a detection circuit and separate a direct-current system of the whole vehicle from a low frequency impulse signal, so that an alternating current interference signal brought for an electrical system through high frequency signal injection is reduced, and the defects of reducing the insulating performance of the whole vehicle, incapability in locating an insulation fault point, complex structure, inaccuracy in detection when a positive pole and a negative pole are leaked simultaneously, which are caused by other detection methods, are avoided.

Description

Technical field [0001] The invention relates to the field of electric vehicles, in particular to an insulation monitoring method for electric vehicles. Background technique [0002] Today, when the dual factors of energy shortage and environmental degradation are becoming more and more significant, the development of new energy vehicles with power batteries as the main power is booming. [0003] Compared with conventional cars that use fuel or natural gas as a power source and rarely have high voltage and insulation problems, in order to meet the powerful power required by traction cars, due to the battery itself, the current power battery is connected in series with multiple cells. Meet this demand of automobiles. However, the use of multi-cell series connection will greatly increase the volume of the battery, and the contact area with the body will be greatly increased. The insulation between the body and the battery will be very important, and the electric vehicle uses the powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 杨重山
Owner JIANGSU ALFA BUS
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