Monitoring isolation in at least one High Voltage (HV) system present in an Electric Vehicle (EV) by calculating a leakage ratio as Vpack/Vi, wherein Vpack is the voltage of a vehicle battery and Vi is input voltage to a differential amplifier. A leakage resistance is determined using the calculated leakage ratio, and the leakage current as Vpack/leakage resistance. At least one action is performed if the leakage current has crossed pre-defined thresholds. The system comprises a series resistor chain having two high value resistances and two low value resistances, a power supply 602, a differential amplifier 603, an ADC (Analog to Digital Converter) 604, an isolator 605, and a controller 606. The high value resistances are connected to the positive and negative terminals of a battery 601. The low value resistances are connected across inverting and non-inverting inputs of the differential amplifier and a junction of the low value resistances is connected to chassis of the EV. The differential amplifier monitors voltage difference between the inverting and non-inverting inputs. The ADC 604 converts the voltage difference into digital form and the isolator isolates digital data from output of the ADC.


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    Title :

    Systems and methods for monitoring isolation in high voltage systems



    Publication date :

    2018-05-23


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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



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