The invention relates to the technical field of
voltage acquisition, in particular to a battery string
voltage acquisition
system with a calibration
system and a
voltage acquisition method. Which comprises a multi-path voltage input end, a voltage
signal adjusting end, a voltage follower, an analog-to-
digital converter, a main control center and a communication circuit, and is characterized in that the voltage
signal adjusting end comprises a dynamic voltage division network, consists of a
digital potentiometer and a high-voltage
operational amplifier, and dynamically adjusts the voltage division ratio to suppress common-mode voltage; the main control center is integrated with a multi-channel synchronous sampling calibration module and generates a global synchronous
signal through the main MCU to control the ADC to perform synchronous acquisition; a temperature compensation module is arranged between the voltage follower and the ADC, and a digital temperature sensor is adopted to correct the
gain drift of the
operational amplifier in real time; the voltage division ratio of the dynamic voltage division network is dynamically adjusted according to the real-time common-mode voltage and a preset safety threshold value. According to the scheme, dynamic
partial pressure adjustment, multi-channel self-calibration, nonlinear temperature compensation and a rapid
protection mechanism can be integrated.