Charging Circuit Segmentation for Fast Battery Charging
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Solution Overview
Problem
Current charging devices are limited by a power supply range of 4.5V, which restricts the reduction of charging time during the constant voltage phase, as the voltage output end is not allowed to exceed this value, hindering the achievement of fast charging.
Innovation Solution
A charging device with a main charging circuit and at least two secondary charging circuits connected in parallel, where the main circuit disconnects from the battery when reaching the voltage required by the internal chip, allowing the secondary circuits to supply power to the battery at increased voltages beyond 4.5V, thereby extending the constant current phase and shortening the charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage output end is limited to not exceed 4.5V to ensure internal chip safety, then the internal chip is protected from overvoltage damage, but the charging time during constant voltage phase cannot be reduced
Solution Approach 1:
The charging device divides the charging circuits into a main charging circuit and at least two secondary charging circuits. The main charging circuit is dedicated to powering the internal chip with controlled voltage, while the secondary charging circuits are dedicated to charging the battery with higher voltages. This segmentation allows simultaneous operation at different voltage levels, resolving the contradiction between chip safety and charging speed.
Solution Approach 2:
The controller acts as an intermediary that manages the switching between main and secondary charging circuits. It monitors the battery charging status and automatically switches from the main charging circuit to the secondary charging circuits when the battery enters constant voltage phase, enabling high-voltage fast charging without compromising internal chip safety.
2Device complexity
If the main charging circuit supplies power to both the internal chip and the battery, then the circuit structure is simple, but the voltage required by the internal chip limits the charging voltage and extends charging time
Solution Approach 1:
The charging device segments the charging function into two independent paths: the main charging circuit for internal chip power supply with voltage limited to 4.5V, and the secondary charging circuits for battery charging that can operate at higher voltages. This functional segmentation eliminates the voltage bottleneck while maintaining reasonable circuit complexity through modular design.
Solution Approach 2:
The system dynamically switches between different charging circuits based on battery status. During constant current phase, the main charging circuit charges the battery; when entering constant voltage phase, the controller switches to secondary charging circuits for high-voltage fast charging. This dynamic switching optimizes charging speed at different stages without compromising overall system simplicity.
Data Source
AI summary
A charging device, a charging method and a terminal, an output end of the main charging circuit and output ends of the at least two secondary charging circuits are connected to a battery of an electronic device, and the output end of the main charging circuit is used for supplying power for an internal chip of the electronic device, disconnecting a connection between the main charging circuit and the battery when a voltage of the output end of the main charging circuit reaches a voltage required by the internal chip, and supplying power for the battery through the output ends of the at least two secondary charging circuits, in this way, charging time is shortened and a purpose of fast charging a battery is achieved.