Incremental ADC Bias Current Control for Battery Management
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Solution Overview
Problem
Systems using incremental delta-sigma analog-to-digital converters, such as battery management systems, face low energy consumption efficiency due to the constant use of a bias current during oversampling periods.
Innovation Solution
The system divides the oversampling period into segments based on cumulative weight, reducing the bias current in periods where the cumulative weight is smaller, with the bias current generator providing a higher amount at the start of the period and progressively lower amounts as the cumulative weight decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bias current having a given level is used during the oversampling period in the incremental ADC, then the conversion accuracy and stability are maintained, but the energy consumption increases
Solution Approach 1:
The bias current is changed from a static constant value to a dynamic time-varying value. The bias current generator applies a first bias current level during the first period (from start timing to preset timing) and a second bias current level (lower than the first) during the second period (subsequent to the first period). This dynamic adjustment maintains conversion accuracy during the critical accumulation phase while reducing energy consumption during later phases.
Solution Approach 2:
The oversampling period is divided into distinct time periods with different bias current levels. The bias current generator periodically switches between the first bias current (higher level) during the first period and the second bias current (lower level) during the second period. This periodic action allows the system to maintain performance during critical phases while reducing power consumption during less critical phases.
2Stability of the object's composition
If a bias current having a given level is continuously provided during the oversampling period, then the accumulation process is stable, but the consumption of bias current increases
Solution Approach 1:
The oversampling period is segmented into a first period and a second period. The bias current generator provides different bias current levels in these segments: a first bias current level during the first period and a second bias current level (lower than the first) during the second period. This segmentation allows the system to maintain accumulation stability during the critical first period while reducing energy loss during the second period.
Solution Approach 2:
The bias current parameter is changed over time within the oversampling period. The bias current generator adjusts the bias current from a higher level (first bias current) during the first period to a lower level (second bias current) during the second period. This parameter change optimizes the balance between accumulation stability and energy consumption by applying higher current only when necessary.
Data Source
AI summary
Disclosed are a system and a battery management integration circuit using an incremental analog-to-digital converter (ADC), which can reduce the consumption of the amount of a bias current. The system includes an incremental ADC configured to perform accumulation on an analog signal during an oversampling period and a bias current generator configured to provide a bias current for the accumulation of the incremental ADC. The bias current generator provides a first amount of the bias current in a first period defined from start timing of oversampling to preset timing during the oversampling period, and provides a second amount of the bias current, smaller than the first amount of the bias current, in a second period subsequent to the first period.