Battery Charging Circuit With Adjustable Branch Impedance Balancing
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Solution Overview
Problem
The direct parallel connection of batteries with varying sizes and capacities in electronic devices leads to overcurrent risks in batteries with smaller internal resistance, compromising safety and reducing charging efficiency.
Innovation Solution
A charging/discharging circuit with adjustable impedance branches for each battery, controlled by a processing module to balance current ratios based on voltage and current feedback, ensuring no overcurrent while maintaining optimal charging speed and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If batteries with different capacities are directly connected in parallel for charging, then charging speed is improved, but overcurrent risk increases in batteries with smaller internal resistance
Solution Approach 1:
The patent changes the impedance parameter of the first branch dynamically through the first control circuit. By adjusting the impedance of the first branch, the current distribution between batteries is controlled to match their capacity ratio, preventing overcurrent in smaller batteries while maintaining high charging speeds for larger batteries.
Solution Approach 2:
The first control circuit acts as an intermediary element in the first branch, mediating the current flow to the first battery. It regulates the impedance to ensure that the current ratio between parallel-connected batteries of different capacities matches their capacity ratio, thereby eliminating overcurrent risks while preserving charging efficiency.
2Reliability
If charging current is limited based on the battery with smaller internal resistance, then overcurrent risk is eliminated, but charging speed decreases
Solution Approach 1:
The patent applies different impedance characteristics to different branches. The first branch, connected to the larger capacity battery, has adjustable impedance controlled by the first control circuit, while the second branch maintains its natural characteristics. This local differentiation allows each battery to receive appropriate current based on its capacity, maintaining overall charging speed without compromising safety.
3Duration of action of stationary object
If parallel charging is used for multiple batteries, then battery life is extended, but current distribution becomes unbalanced leading to overcurrent risks
Solution Approach 1:
The processing module monitors the current in both branches and uses this feedback to control the first control circuit. Based on the detected current values, the processing module adjusts the impedance of the first branch to maintain the current ratio consistent with the battery capacity ratio, ensuring balanced current distribution and preventing overcurrent conditions.
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
Ensures safe and efficient charging by balancing current distribution across batteries with different capacities, preventing overcurrent and enhancing charging speed and efficiency.
Implementation Method 1
The first control circuit is configured to adjust impedance of the first branch
Data Source
AI summary
A charging/discharging circuit and an electronic device are provided. The circuit includes: a first terminal of a first branch is connected to an electrical energy supply terminal, and a second terminal of the first branch is connected to the first battery; a first terminal of a second branch is connected to the electrical energy supply terminal, and a second terminal of the second branch is connected to the second battery; the first branch includes a first control circuit; the first control circuit is configured to adjust impedance of the first branch; and a controller is configured to: indicate, based on a first current and a second current, the first control circuit to adjust impedance of the first branch, so that a ratio of the first current to the second current is close to the first value.