Multi-Battery Charging Circuit With Dynamic Impedance Balancing
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Solution Overview
Problem
In existing multi-battery parallel charging solutions, the impedance of charging branches is fixed, leading to unequal charging currents and preventing simultaneous full charging of batteries, resulting in suboptimal application efficiency.
Innovation Solution
A charging/discharging circuit with a processing module and control circuits that adjust impedance in each branch to balance currents, ensuring that both batteries are charged simultaneously by dynamically controlling impedance based on current and voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed impedance is used in charging branches, then circuit complexity is reduced, but charging current balance deteriorates
Solution Approach 1:
The patent implements dynamic impedance adjustment in charging branches through control circuits that continuously monitor battery states and modify branch impedance in real-time. This allows the system to adapt charging currents to match battery requirements, resolving the contradiction between simple fixed-impedance circuits and the need for precise current balance.
Solution Approach 2:
The patent changes the impedance parameter of charging branches based on battery state-of-charge, capacity, and voltage levels. By dynamically adjusting impedance values rather than using fixed values, the system achieves precise charging current balance while maintaining manageable circuit complexity through standardized adjustment mechanisms.
2Manufacturing precision
If dynamic impedance adjustment is implemented, then charging current balance is improved, but device complexity increases
Solution Approach 1:
The patent divides the charging system into independent charging branches, each with its own control circuit that adjusts impedance locally. This segmentation allows dynamic adjustment without requiring complex system-wide control, reducing overall device complexity while maintaining precise current balance through distributed intelligence.
Solution Approach 2:
The patent implements feedback control where control circuits continuously monitor battery voltage, current, and state-of-charge, then adjust branch impedance accordingly. This closed-loop feedback mechanism achieves precise charging current balance automatically, reducing the need for complex manual intervention or overly sophisticated control systems.
3Productivity
If parallel charging is used without current balancing, then charging speed is improved, but battery application efficiency deteriorates
Solution Approach 1:
The patent maintains high charging speeds through parallel charging while dynamically adjusting branch impedances to ensure all batteries reach full charge simultaneously. This dynamic adjustment prevents the efficiency loss that occurs when some batteries are overcharged while others remain undercharged, thus maintaining both high productivity and reliability.
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 balances the charging speeds of multiple batteries, allowing them to be fully charged simultaneously and improving application efficiency by minimizing power consumption and optimizing power distribution.
Implementation Method 1
the second branch includes a first control circuit, and the first control circuit is configured to adjust impedance of the second branch
Data Source
AI summary
A charging/discharging circuit and an electronic device. A first end of a first branch is connected to a voltage supply end, a second end thereof is connected to a first battery, and a voltage provided by the voltage supply end charges the first battery through the first branch; a first end of a second branch is connected to the voltage supply end, a second end thereof is connected to a second battery, and the voltage provided by the voltage supply end charges the second battery through the second branch; the second branch includes a first control circuit that is configured to adjust impedance of the second branch; and a processing module is configured to obtain a first current of the first branch and a second current of the second branch, and indicate, based on the first and second currents, the first control circuit to adjust impedance of the second branch.