Charging Mode Switching Circuit for Mobile Terminals
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Solution Overview
Problem
Conventional mobile terminal charging circuits support only low charging currents due to the limited capabilities of the MICRO USB interface, resulting in slow charging speeds and increased frequency of charging needs.
Innovation Solution
A circuit and method for switching charging modes are introduced, which include a switch circuit, a switching assembly, and controllers to detect and connect with quick-charging adapters, allowing for faster charging by switching between conventional and quick-charging modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional charging circuit with MICRO USB interface is used, then the device structure remains simple, but the charging current is limited to less than 3 amperes resulting in slow charging speed
Solution Approach 1:
The charging circuit is divided into multiple independent charging circuits (first charging circuit, second charging circuit, third charging circuit) that can operate separately or in combination. Each charging circuit has its own switching control, allowing the system to select appropriate charging paths based on power requirements without redesigning the entire charging system.
Solution Approach 2:
The patent implements dynamic switching between different charging circuits based on real-time power requirements. The switching assembly receives control signals to dynamically connect or disconnect charging circuits, enabling the system to adapt charging current from conventional levels (less than 3A) to quick-charging levels (3A or more) as needed.
2Productivity
If multiple charging circuits are added to support quick charging, then charging speed improves, but the device complexity increases
Solution Approach 1:
The switching assembly serves multiple functions: it controls connection/disconnection of charging circuits, selects active charging paths, and coordinates between different charging circuits. This multi-functional component reduces the need for separate control mechanisms for each charging circuit, thereby managing complexity while enabling multiple charging modes.
Solution Approach 2:
The switching assembly acts as an intermediary between the power supply system and the battery, intelligently routing power through appropriate charging circuits. It receives control signals from the processor and translates them into physical connection changes, simplifying the overall control architecture while enabling complex charging behaviors.
3Adaptability or versatility
If a switching assembly with multiple terminals is implemented, then charging mode flexibility improves, but the device complexity increases
Solution Approach 1:
Different terminals of the switching assembly are assigned specific functions: the first terminal connects to the first charging circuit, the second terminal to the second charging circuit, and the third terminal to the battery. This localized functional assignment allows each terminal to be optimized for its specific purpose while maintaining overall system simplicity through clear separation of responsibilities.
Data Source
AI summary
A circuit and method for switching a charging mode are provided. The circuit for switching a charging mode, is coupled to a cell and externally coupled to a quick-charging adapter, and includes: a switch circuit, configured to connect the charging terminal and the cell terminal if a connection instruction is received from the first controlled terminal, such that the quick-charging adapter charges the cell via the switch circuit; a switching assembly, configured to receive a switching instruction from the controlled terminal; a first controller, configured to: receive a charging instruction, receive a quick-charging instruction at the first data terminal via the data interface terminal, and send the connection instruction from the third controlling terminal if the charging instruction and the quick-charging instruction are received; and a second controller, configured to send the charging instruction to the first controller if an insertion of the quick-charging adapter is detected.