Battery management systems 1 Reference Designs Collateral Automotive HighVoltage and Isolation Leakage Measurements Ref Design Leakage Current Measurement Ref Design for determining Insulation Resistance ID: 1044342
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1. Precision Amplifiers for Battery management systems1Reference Designs / CollateralAutomotive High-Voltage and Isolation Leakage Measurements Ref. DesignLeakage Current Measurement Ref. Design for determining Insulation Resistance Collateral Subsystem: 48V battery current measurement Subsystem: Isolation leakage measurementsHV BatterySelect OPAMP or Difference amplifier / INA depending on error budgetOPAx388-Q1TI Confidential - NDA RestrictionsReference Designs / CollateralBattery current measurements (48V systems) – OPAx388-Q1Very high precision for reducing error when measuring lower end of current range with small shunts.High gain bandwidth to measure mA to kA range.Very low 1/f noise to increase measurement resolution. Isolation current measurements – OPA320-Q1, INA333-Q1, INA148-Q1High precision and low gain error with integrated matched resistors to reduce total error, account for shifting chassis GND and reduce BOM cost.Key amplifier wpecs and hero partsReference Designs / CollateralDeviceSupply Range Vos (mV) (max)Vos Drift (typ) (uV/ºC)GBW (MHz)Slew Rate(V/µs)Voltage Noise (typ) (nV/)IBias (typ) (pA)OPAx388-Q1Texas Instruments2.5V – 5.5V.005.005105730AD8628Analog Devices2.7V – 5.5V.005.0022.512230MCP6V91Microchip2.V – 5.5V.009.017109.5112DeviceSupply Range Vos (mV) (max)Vos Drift (typ) (uV/ºC)GBW (MHz)Slew Rate(V/µs)IBias (typ) (pA)OPAx388-Q1Texas Instruments2.5V – 5.5V.005.005105730AD8628Analog Devices2.7V – 5.5V.005.0022.512230MCP6V91Microchip2.V – 5.5V.009.017109.5112Key spec competitor analysisSystems engineer – Kartik SinhaMarketing engineer – Jacob Fattakhov PRAMPS automotive contactsLeading Spec
2. LAMPs in HEV/EV – BMS2Reference Designs / CollateralHero partsFunctionKey LAMP requirementDevices Precision Low side current sense to maintain battery SoCHigh precision OPAMP with high dynamic range to measure lower currents with very small shuntsOPA607-Q1, OPA388-Q1Budget consciousTLV9062/4-Q1, TLV9352-Q1Battery voltage measurementLow measurement error w external resistor dividerOPA365-Q1, TLVx197-Q1Budget conscious w external resistor dividerTLV9002/4-Q1, TLV9352-Q1High common mode Difference amplifier with integrated matched resistorsINA148-Q1OC & OV fault detect with comparators Low offset, fast response, precision integrated referenceTLV9022-Q1, LM2903B-Q1,TLV4011-Q1, TLV6703-Q1Current/Voltage SenseDiscovery Questions:Precision requirements for current measurements? When high, when low?Is Isolation leakage measurement done in this system?Correlation between battery bus voltage measurement error and system efficiency?FunctionKey LAMP requirementDevices Buffer OPAMP for NTCBudget conscious TLV9002/4-Q1, LM290xLV-Q1, LM2904B-Q1High precisionOPA333-Q1Thermocouple, 3-wire RTD front endLow power instrumentation amplifierINA333-Q1Thermal switch (COMP)Low power, low offset, integrated hysteresisTLV7041-Q1, TL331B-Q1, LM2903B-Q1Temperature Sense