Dual-Battery Charging Circuit With Independent Voltage Conversion
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Solution Overview
Problem
Dual-battery or multi-battery serial charging is limited by inconsistent battery capacities, leading to reduced charging speed and duration in electronic devices like foldable devices, where batteries on different boards have varying capacities and power consumption.
Innovation Solution
A charging circuit with separate voltage conversion circuits for each battery, allowing different current outputs based on battery parameters, ensuring overlapping working states to charge batteries simultaneously with distinct currents, thereby addressing capacity discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If serial charging is used for dual-battery or multi-battery electronic devices, then charging performance is improved, but charging speed is limited by the small-capacity battery when battery capacities are inconsistent
Solution Approach 1:
The charging circuit is segmented into multiple independent voltage conversion circuits, each responsible for charging one battery. This allows each battery to receive independently controlled charging current, eliminating the bottleneck caused by serial charging where the smallest battery limits the charging speed of all batteries.
Solution Approach 2:
The charging circuit dynamically adjusts the charging current for each battery based on its capacity and charging state. The controller can allocate more current to larger-capacity batteries and less to smaller ones, optimizing overall charging performance while preventing overheating or overcharging of any individual battery.
2Speed
If separate voltage conversion circuits are used for each battery, then charging speed is improved, but device complexity increases
Solution Approach 1:
Multiple voltage conversion circuits share common components such as the input power supply interface, control unit, and protection mechanisms. This multi-functional design allows the system to achieve independent charging capabilities for multiple batteries while avoiding the need to duplicate all circuit components, thereby reducing overall complexity.
Solution Approach 2:
The patent merges the control functions of multiple voltage conversion circuits into a single controller that can manage all charging operations. This centralized control approach simplifies the system architecture by eliminating the need for separate control units for each voltage conversion circuit, reducing component count and system complexity.
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 approach enables simultaneous and efficient charging of batteries with different capacities, enhancing overall charging speed and duration in dual-battery or multi-battery electronic devices.
Implementation Method 1
a first voltage conversion circuit TC1, configured to convert an input voltage into a first output voltage Vbat1
Implementation Method 2
a second voltage conversion circuit TC2, configured to convert the input voltage into a second output voltage Vbat2
Data Source
AI summary
An input end of the first voltage conversion circuit and an input end of the second voltage conversion circuit are coupled to a power supply end; an output end of the first voltage conversion circuit is configured to be coupled to a positive electrode of a first battery, a negative electrode of the first battery is coupled to a positive electrode of a second battery, and a negative electrode of the second battery is coupled to a ground; and an output end of the second voltage conversion circuit is configured to be coupled to the positive electrode of the second battery. A first voltage conversion ratio of the first voltage conversion circuit is different from a second voltage conversion ratio of the second voltage conversion circuit, and a working state of the first voltage conversion circuit and a working state of the second voltage conversion circuit overlaps.