How does DC bias behavior affect BMS voltage regulation and measurement accuracy?
BMS circuits rely on stable power rails to ensure accurate voltage, current, and temperature sensing. When an inductor enters partial saturation under DC bias, its inductance decreases, causing higher ripple current and degraded transient response in the DC-DC converter. This ripple propagates into ADC reference rails, current-sense amplifiers, and digital control circuits, introducing measurement noise and drift. In battery protection and balancing functions, even small voltage deviations can lead to incorrect state-of-charge or state-of-health estimation. Inductors used in BMS DC-DC converters must therefore maintain predictable inductance across DC bias and temperature to preserve measurement integrity.