Multi-Battery Power Circuit With Series Charge and Parallel Discharge
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Solution Overview
Problem
Small-sized electronic devices with multiple batteries of different capacities face inefficiencies in charging, leading to wasted battery capacity due to unequal charging currents and voltages, which are not optimally managed by existing technologies.
Innovation Solution
A power supply circuit and method that connects batteries in series during charging to equalize charging currents based on capacity ratios and in parallel during discharge to match system voltage, using switches and circuits to manage charging and discharging efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If batteries with different capacities are charged simultaneously using conventional parallel charging, then charging simplicity is maintained, but battery capacity resources are wasted due to unequal charging currents
Solution Approach 1:
The charging circuit is segmented into multiple independent charging paths, each equipped with its own charging control circuit. This allows each battery to receive customized charging current according to its capacity, avoiding the waste of battery capacity resources while maintaining charging efficiency
Solution Approach 2:
The charging circuit dynamically adjusts the charging current for each battery based on its capacity. The charging control circuit automatically configures the charging path and current parameters, transforming the static parallel charging into a dynamic adaptive charging system that optimizes battery capacity utilization
2Loss of substance
If series charging is used for batteries with different capacities, then battery capacity resources are better utilized, but charging speed decreases due to current limitations
Solution Approach 1:
The charging circuit dynamically switches between series and parallel configurations based on real-time battery status and capacity requirements. During initial charging, batteries are connected in series to optimize capacity utilization; when batteries are nearly full, the circuit switches to parallel configuration to accelerate charging speed
Solution Approach 2:
The charging circuit changes the electrical connection parameters (series/parallel configuration) and current parameters dynamically during the charging process. This allows the system to optimize both battery capacity utilization and charging speed at different stages of the charging cycle
3Loss of substance
If multiple independent charging circuits are used for each battery, then battery capacity resources are optimized, but device complexity increases
Solution Approach 1:
The charging control circuit is designed as a multi-functional universal controller that can manage multiple batteries simultaneously. It integrates functions of path configuration, current regulation, and charging termination judgment into a single control unit, reducing overall system complexity while achieving optimized battery capacity utilization
Solution Approach 2:
Multiple charging control functions are merged into an integrated charging control circuit that automatically manages the charging of all batteries. The circuit combines path switching, current regulation, and charging termination control into a unified system, simplifying the overall architecture while maintaining optimized charging performance
Data Source
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AI summary
This application discloses a multi-battery power supply, a charging/discharging method, and an electronic device. To charge two batteries, the two batteries are connected in series, so that two batteries with different capacities can be fully charged at the same time. When two batteries supply power to the outside, the two batteries are connected in parallel to avoid efficiency loss caused by power conversion. The power supply circuit includes a first circuit, a second circuit, a first switch, a second switch, a first battery, and a second battery. When the first switch is off, a first controlled terminal of the second switch is electrically connected to a second controlled terminal of the second switch, the first controlled terminal of the second switch is electrically disconnected from a third controlled terminal of the second switch, and when the first circuit is on, the first circuit and the second circuit are configured to supply power to two batteries. When the first switch is on, the first controlled terminal of the second switch is electrically disconnected from the second controlled terminal of the second switch, the first controlled terminal of the second switch is electrically connected to the third controlled terminal of the second switch, and when the first circuit is off, both the batteries supply power to the outside through the second circuit.