The invention provides a new energy automobile insulation detection circuit, method and system and a new energy automobile, and belongs to the technical field of new energy automobiles. A series of large resistors (such as Momega-level resistors) for measurement are simultaneously connected to a vehicle body through the positive bus and the negative bus, voltages of a group of the positive bus and the negative bus to the vehicle body are respectively measured, and then one small resistor (such as the Momega-level resistors) is short-circuited to obtain a new group of voltages of the positive bus and the negative bus to the vehicle body. The insulation resistance is calculated according to the relationship between the two groups of voltages and resistors; due to the fact that the change of the resistance value between the positive electrode bus and the negative electrode bus is small, the change of the caused partial pressure value is small, the charging and discharging time of the Y capacitor is not long, insulation detection is more timely and stable, and false alarms or the situation that the requirements of laws and regulations are not met are avoided.

    本发明提供了新能源汽车绝缘检测电路、方法、系统及新能源汽车,属于新能源汽车技术领域;在正极母线和负极母线同时对车身地并入一系列测量用的大电阻(例如MΩ级),分别测量出一组正极母线和负极母线对车身地的电压,再将其中一颗小电阻(例如KΩ级)短接,获得新一组正极母线和负极母线对车身地的电压,通过两组电压和电阻的关系计算出绝缘电阻;由于正极母线和负极母线间电阻值变化较小,引起的分压值变化也较小,不会造成较长的Y电容充放电时间,使得绝缘检测更加适时和稳定,避免了误报或不满足法规的要求。


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    Title :

    New energy automobile insulation detection circuit, method and system and new energy automobile


    Additional title:

    新能源汽车绝缘检测电路、方法、系统及新能源汽车


    Contributors:
    YAO FENG (author) / WANG YING (author) / SHU HUI (author) / CHEN SHIGANG (author) / WANG XIAOHUI (author)

    Publication date :

    2022-11-04


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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