Design of Acquisition Front-end and Σ-ΔADC in Battery Management SoC

To guarantee the safety and efficiency of new energy automobiles, the acquisition front-end circuit of battery management IC requires high precision voltage detection. Therefore, using IC design methodology of System to Chip, system-level design and verification are carried out first. Based on new acquisition front-end structure, high-precision multi-channel voltage synchronous detection is achieved, cell voltage detection error is less than 5mV, and accuracy is about 0.15%. Then, Σ-ΔADC modulator is designed, which is the key module of chip-level high-precision acquisition front-end circuit of BMS SoC. After behavioral simulations, circuit and layout design and simulation, the Σ-Δ modulator ENOB reaches 16.58, and SNDR reaches 101.6 dB, which achieves design requirements. The system-level verification of high-precision acquisition front-end circuit and the design of its Σ-ΔADC modulator make preparations for the implementation of high-precision acquisition front-end in BMS SoC.