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High voltage cell set system isolation total voltage and insulation resistance detection circuit and detection method thereof

A technology of insulation resistance and detection circuit, applied in the direction of measuring current/voltage, measuring resistance/reactance/impedance, impedance measurement, etc., can solve problems such as insulation resistance error, high-voltage detection interference, and susceptibility to interference, and achieve good accuracy and resistance Strong jamming capability and improved safety

Inactive Publication Date: 2014-09-17
SUNWODA ELECTRONICS
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Problems solved by technology

[0005] In a high-voltage battery pack system, especially a vehicle-mounted battery pack system, when inverters, motor controllers and other equipment are working, they will cause great interference to high-voltage detection
Especially in the insulation resistance detection, the insulation resistance detection signal is extremely weak and is very susceptible to interference
In addition, in the conventional algorithm, a small deviation in AD sampling will cause an error of tens of kiloohms or even hundreds of kiloohms in the insulation resistance.
In some detection systems, low-pass filter, digital average and other methods are used to filter out high-frequency noise, which often cannot achieve good results

Method used

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  • High voltage cell set system isolation total voltage and insulation resistance detection circuit and detection method thereof
  • High voltage cell set system isolation total voltage and insulation resistance detection circuit and detection method thereof
  • High voltage cell set system isolation total voltage and insulation resistance detection circuit and detection method thereof

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Embodiment Construction

[0036] As an independent module in the BMS (battery management system) of electric vehicles, the present invention communicates with the BMS main control module through the CAN bus, detects the insulation performance of the system in real time, and reports to the main control through the CAN bus, once the insulation is damaged , the main control takes corresponding measures in time, and related actions include: cut off the contactor, sound and light alarm, etc.

[0037]The insulation detection module includes the following parts: battery pack positive and negative bus bars (B+, B-), high voltage switch (Kp, Kn), resistor network (R1~R4), signal processing circuit (OP1~OP6), earth or vehicle body . Rp and Rn are the insulation resistance between the positive and negative bus bars and the earth or the car body respectively. It is controlled by an external microcontroller and sampled by AD, and sent to the main control unit through the field bus.

[0038] In this embodiment, th...

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Abstract

The invention discloses a high voltage cell set system isolation total voltage and insulation resistance detection circuit and a detection method thereof. The circuit comprises a voltage division resistor network formed by R1-R4, a high voltage switch network formed by Kp and Kn, and a positive and negative two-path signal processing circuit formed by OP1-OP6, R5-R14 and C1-C2, wherein the OP1 and the OP2 in a signal processing portion form two paths of voltage followers, the OP3, a capacitor C1 and the resistor R5 form a high pass filter, the OP5 and the resistors R7-R10 form a difference amplifier, the OP4, a capacitor C2 and the resistor R6 form a high pass filter, the OP6 and the resistors R11-R14 form a difference amplifier, and the excellent filtering effect is realized through subtracting the high frequency portion from the positive and negative two-path signals. According to the circuit, the high-efficiency signal processing method and a calculation method are employed, problems of overhigh cost, single detection algorithm, poor anti-anti-interference capability, relatively poor calculation precision and incapability in solving various electric leakage situations are solved, and damage to insulation performance of a system in a detection process is avoided.

Description

technical field [0001] The invention relates to a voltage and resistance detection circuit and a detection method thereof, in particular to a high-voltage battery pack system isolation total voltage and insulation resistance detection circuit and a detection method thereof, belonging to the technical field of battery management. Background technique [0002] In electric vehicles and large-scale energy storage battery pack systems, the voltage is often very high, generally several hundred volts, and high-voltage safety protection is an important issue for high-voltage battery pack systems. Under normal conditions, the positive and negative busbars of the battery system and the vehicle body (or the casing of the equipment) have good insulation performance, but during use, due to vibration, device aging, moisture, corrosion and other problems, insulation damage may occur, and leakage may occur. Affect the personal safety of passengers or operators. Therefore, in this kind of h...

Claims

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Application Information

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IPC IPC(8): G01R19/10G01R27/02G01R27/18
Inventor 雷晶晶郑伟伟陈小源
Owner SUNWODA ELECTRONICS
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