Variable Reference Voltage Circuit for Battery Cell Abnormality Detection
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Solution Overview
Problem
Conventional battery monitoring systems fail to accurately detect abnormalities in cell voltage measurement systems, particularly when errors occur in analog digital conversion devices or differential amplifier circuits due to degradation over time, leading to potential overcharging or overdischarging of battery cells.
Innovation Solution
The implementation of a battery monitoring device with a reference voltage generation circuit that generates multiple reference voltages, allowing for the selection of different voltage references and the use of an oscillator to change the reference voltage within a predetermined range, enabling accurate detection of malfunctions in the AD converter and differential amplifier circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference voltage is used for diagnosis, then the device complexity is reduced, but the measurement precision deteriorates because abnormalities in particular voltage ranges cannot be detected
Solution Approach 1:
The patent applies dynamics by making the reference voltage changeable rather than fixed. The reference voltage generation circuit dynamically adjusts the reference voltage value based on detection needs, allowing the system to test different voltage ranges and detect abnormalities that would be invisible with a single fixed reference voltage. This resolves the contradiction by enabling high measurement precision across multiple voltage conditions without permanently increasing device complexity.
Solution Approach 2:
The patent changes the parameter of reference voltage from a fixed value to a variable value. By enabling the reference voltage to take on different values during operation, the system can perform comprehensive diagnostics across various voltage ranges. This parameter change allows detection of AD converter and differential amplifier abnormalities regardless of the voltage range in which they occur, achieving high measurement precision without requiring multiple permanent reference voltage sources.
2Reliability
If the reference voltage is fixed, then the device complexity is reduced, but the reliability deteriorates because abnormalities in particular voltage ranges remain undetected
Solution Approach 1:
The patent makes the reference voltage dynamic rather than fixed, allowing the system to adapt to different detection scenarios. By dynamically adjusting the reference voltage, the system can reliably detect abnormalities across all voltage ranges, significantly improving battery monitoring reliability. The dynamic nature of the reference voltage generation circuit ensures comprehensive coverage without requiring multiple fixed reference voltage sources.
Solution Approach 2:
The reference voltage generation circuit is designed to be universal, capable of providing multiple reference voltage values for different detection purposes. This multi-functionality allows a single circuit to perform comprehensive diagnostics across various voltage ranges, enhancing reliability without proportionally increasing device complexity. The universal reference voltage generation circuit serves multiple diagnostic functions that would otherwise require separate dedicated circuits.
3Measurement precision
If conventional diagnosis methods are used, then the device complexity is low, but the measurement precision deteriorates because specific abnormality states cannot be detected
Solution Approach 1:
The patent changes the detection parameter from a single reference voltage value to multiple variable reference voltage values. This enables the detection system to identify abnormalities in AD converters and differential amplifiers across different voltage ranges. By varying the reference voltage parameter, the system achieves high measurement precision and comprehensive detection capability, resolving the contradiction between simple conventional methods and accurate abnormality detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for the correct detection of abnormality states in the cell voltage measurement system, enhancing the safety and reliability of the battery monitoring system by preventing overcharging or overdischarging, which is critical for maintaining the health and longevity of battery cells.
Implementation Method 1
a voltage detecting apparatus provided with a voltage controlled oscillator and a data output circuit is described. The voltage controlled oscillator works to output a signal with a logical value that is periodically inverted when an input voltage is applied thereto.
Data Source
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AI summary
A battery monitoring device for monitoring a cell group made by connecting a plurality of single battery cells in series includes a reference voltage generation circuit configured to generate a variable reference voltage, a switching circuit configured to select, as a measurement target voltage, any one of a plurality of types of voltages including the cell voltages of the single battery cells in the cell group and the reference voltage, and an AD converter configured to measure the measurement target voltage which is selected by the switching circuit, and output a digital signal according to the measurement result.