Battery Charging Circuit Using Voltage-Section Capacity Integration
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Solution Overview
Problem
Existing battery charge capacity measurement methods require additional components like Coulomb counters, hindering size and cost reduction in electronic devices, and fail to accurately account for varying battery capacity characteristics without complex calculations.
Innovation Solution
A circuit device with a charging circuit, voltage measurement circuit, storage unit, and control circuit that uses weighting coefficients stored in voltage sections to integrate battery capacity, eliminating the need for Coulomb counters and enabling accurate charge capacity determination through integration processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Coulomb counter is disposed between the charging circuit and the battery to obtain charge capacity, then the charge capacity measurement accuracy is improved, but the device size and cost increase
Solution Approach 1:
The patent extracts the charge capacity measurement function from a separate Coulomb counter component and integrates it into the existing control circuit of the charging device. The control circuit uses its existing ADC to read battery voltage and applies a weighting coefficient integration algorithm to calculate charge capacity, thereby eliminating the need for an additional Coulomb counter component while maintaining measurement accuracy
Solution Approach 2:
The patent replaces the hardware-based Coulomb counter with a software-based calculation method. Instead of using a dedicated measurement device, the system uses the control circuit to perform voltage sampling and integrate weighting coefficients through computational algorithms, substituting a physical measurement component with a digital processing approach
2Measurement precision
If time measurement and current value measurement are performed for each voltage section to calculate charge capacity, then the charge capacity is obtained, but the processing load increases
Solution Approach 1:
The patent pre-calculates and stores weighting coefficients for different battery voltage sections in a lookup table within the control circuit. During charging, instead of performing complex real-time calculations, the system simply reads the pre-computed weighting coefficient corresponding to the current voltage section and accumulates it, significantly reducing the processing load while maintaining accurate charge capacity calculation
Solution Approach 2:
The patent transforms the charge capacity calculation from a continuous function of time and current into a discrete summation of voltage-section-based weighting coefficients. By changing the calculation parameter from (time × current) to (weighting coefficient accumulation based on voltage sections), the system simplifies the computational complexity and reduces processing requirements
Data Source
AI summary
A circuit device includes a charging circuit configured to charge a battery, a voltage measurement circuit configured to measure a battery voltage of the battery, a storage unit configured to store weighting coefficients for a battery capacity in respective voltage sections of a plurality of voltage sections, and a control circuit configured to perform integration processing on the weighting coefficients based on a measurement result of the battery voltage by the voltage measurement circuit, and obtain a charge capacity of the battery charged by the charging circuit based on a result of the integration processing.