Clamp Meter Circuit for Dynamic Battery Internal Resistance
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Solution Overview
Problem
Current methods for measuring battery internal resistance are complicated and do not account for the dynamic changes in resistance due to varying load conditions and composition changes over time.
Innovation Solution
A clamp meter system with integrated circuits and sensors to measure battery current and voltage under different load conditions, calculating internal resistance by subtracting and dividing digital signals to provide an accurate resistance value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional methods are used to measure battery internal resistance, then the measurement can be performed, but the measurement process is very complicated
Solution Approach 1:
The clamp meter is enhanced with multiple measurement functions including voltage measurement, current measurement, and internal resistance measurement. The system uses a single device to perform all these functions through integrated measurement circuits and processing units, eliminating the need for separate specialized instruments and simplifying the overall measurement process.
Solution Approach 2:
The system introduces auxiliary measurement circuits and processing units as intermediaries to automatically calculate internal resistance. Instead of requiring direct complex measurements, the system uses voltage measurements, current measurements, and power measurements as intermediate steps, then computes the internal resistance through automated processing, greatly simplifying the user's task.
2Measurement precision
If battery internal resistance is measured under varying load conditions, then the dynamic changes in resistance can be captured, but the measurement and calculation process becomes more complex
Solution Approach 1:
The system performs multiple measurements at different time points under varying load conditions. By conducting voltage measurements, current measurements, and power measurements at different moments, the system captures the dynamic behavior of battery internal resistance. The processing unit then analyzes these periodic measurements to determine accurate resistance values that reflect real operating conditions.
Solution Approach 2:
The system continuously monitors voltage, current, and power parameters and uses this feedback information to calculate internal resistance dynamically. The processing unit receives real-time measurement data and automatically adjusts calculations based on the varying load conditions, providing continuously updated resistance values that accurately reflect the battery's state under different operating conditions.
Data Source
AI summary
A clamp meter system with a battery-internal-resistance-measuring function includes a first processing unit, an analog-to-digital converting circuit, a current-measuring circuit, a direct-current current sensor, a voltage-attenuating network and a voltage probe set. The first processing unit uses the analog-to-digital converting circuit, the current-measuring circuit, the direct-current current sensor, the voltage-attenuating network and the voltage probe set to measure a battery current and a battery total voltage of a plurality of batteries to obtain a second digital current signal and a second digital voltage signal. A first digital voltage signal subtracts the second digital voltage signal to obtain a voltage difference. The second digital current signal subtracts a first digital current signal to obtain a current difference. The voltage difference is divided by the current difference to obtain an overall internal resistance value of the batteries.