Battery Voltage Calibration via Intermediary Power Reference
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Solution Overview
Problem
Battery management systems face challenges in accurately measuring battery voltage due to variations in power voltage of the analog-to-digital converter (ADC), especially during reset events, leading to system shutdown difficulties.
Innovation Solution
A battery management system that includes a micro computer unit with an ADC, a voltage generation unit, a voltage measuring unit, and an error calibration unit, which generates a power voltage, measures its variation, and calibrates the battery voltage using a reference power voltage to ensure accurate measurement and shutdown determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ADC directly measures battery voltage using the battery voltage as power source, then the measurement system is simple, but the measurement precision deteriorates when power voltage varies
Solution Approach 1:
A separate voltage generation unit is introduced as an intermediary to provide a stable reference power voltage to the ADC. This unit generates power voltage from the battery voltage through a regulated process, decoupling the ADC's power supply from direct battery voltage fluctuations. The intermediary stabilizes the measurement reference, allowing accurate battery voltage measurement even when battery voltage varies.
2Reliability
If the system shuts down during reset events to prevent damage, then the reliability improves, but the productivity deteriorates due to repetitive reset operations
Solution Approach 1:
An error calibration unit implements feedback by continuously monitoring the power voltage and comparing it against reference values. When voltage variation exceeds thresholds, the system generates error signals that trigger protective shutdown. This feedback mechanism enables intelligent decision-making, distinguishing between transient resets and genuine faults, thereby reducing unnecessary shutdowns while maintaining reliability.
Solution Approach 2:
The system performs preliminary voltage calibration and error detection before critical failures occur. By pre-establishing reference power voltage levels and setting voltage variation thresholds, the system prepares protective measures in advance, allowing it to respond appropriately to reset events without unnecessary shutdowns.
3Measurement precision
If the voltage generation unit continuously operates to provide stable power, then the measurement precision improves, but the energy consumption increases
Solution Approach 1:
The voltage generation unit operates periodically rather than continuously. It activates during critical measurement phases when high precision is needed and enters low-power states during stable operation periods. This periodic operation maintains measurement accuracy when required while significantly reducing overall energy consumption.
Data Source
AI summary
A battery management system and a battery pack. The battery management system includes a micro computer unit including an analog-to-digital converter (ADC) to measure a battery voltage, a voltage generation unit to generate a power voltage of the ADC by using the battery voltage, a voltage measuring unit to measure the power voltage, and an error calibration unit to measure a variation of the power voltage, measured by the voltage measuring unit, by using a reference power voltage, and calibrate the battery voltage, measured by the ADC, by using the measured variation.