An EMI Immune Daisy Chain Interface for Battery Management System Communication

Battery management systems (BMS) in electric vehicles (EVs) require robust communication interfaces for accurate monitoring and control of lithium-ion battery cells. This paper proposes an EMI-immune daisy chain interface circuit, utilizing either a capacitor or a transformer as an isolator. The system includes a transmitter an active receiver, and a wake-up receiver, achieving a successful transmission under 39-dBm EMI injection. Simulation results demonstrate a CMTI of 100kV/$\mu$ s and low power consumption.