Battery Voltage Detection Using Level Shift and ADC Amplification
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Solution Overview
Problem
Existing voltage detection technologies struggle to accurately measure both large changes over long periods and small changes over short periods in battery output voltage due to limitations in the measurement range of analog-to-digital converters (ADCs).
Innovation Solution
A voltage detection device and method using a level shift unit to adjust the voltage level to the median of the ADC's measurement range, combined with an amplification unit to amplify the signal, and a derivation unit to accurately derive the battery voltage, enabling precise detection of both long-term and short-term voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement range of the ADC is set to cover large voltage changes over long periods, then the ability to detect large changes is improved, but the precision for detecting small changes over short periods deteriorates
Solution Approach 1:
The voltage detection process is segmented into multiple stages: a level shift unit first adjusts the voltage range to fit the ADC measurement capability, then an amplification unit enhances the shifted voltage signal. This segmentation allows the system to handle both large voltage changes over long periods and small voltage changes over short periods by processing different voltage characteristics through specialized units rather than requiring a single ADC configuration to handle all cases.
2Device complexity
If the ADC measurement range is fixed, then the device complexity is reduced, but the ability to accurately detect both long-term and short-term voltage changes deteriorates
Solution Approach 1:
The level shift unit acts as an intermediary between the battery voltage source and the ADC, transforming the battery voltage to a level suitable for ADC measurement. This intermediary component enables the fixed-range ADC to accurately measure varying battery voltages by preprocessing the signal to match the ADC's measurement range, thereby maintaining detection accuracy without requiring a complex variable-range ADC.
3Measurement precision
If the voltage signal is directly fed to the ADC without preprocessing, then the device complexity is minimized, but the detection accuracy for both large and small voltage changes deteriorates
Solution Approach 1:
The amplification unit dynamically adjusts the voltage signal amplitude after the level shift unit has positioned the voltage within the ADC measurement range. This dynamic amplification ensures that small voltage changes are magnified to a detectable level while large voltage changes remain within the ADC's measurement capabilities, providing accurate detection across varying voltage conditions without requiring an overly complex signal processing circuit.
Data Source
AI summary
A voltage detection device, measuring a voltage of a battery by using an analog-to-digital converter (ADC). The voltage detection device includes: a level shift unit, shifting a voltage level of a voltage signal output from the battery to a median of a measurement range of the ADC; an amplification unit, amplifying the voltage signal in which the voltage level is shifted by the level shift unit; the ADC, measuring the voltage signal amplified by the amplification unit, and outputting a digital sample signal in accordance with the voltage signal; and a derivation unit, deriving a voltage value of a voltage of the battery based on the sample signal output from the ADC.