Charging Mode Switch Circuit for Mobile Terminals
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Solution Overview
Problem
Conventional mobile terminals require frequent charging due to increased usage, with the MICRO USB interface only supporting charging currents less than 3 amperes, resulting in slow charging speeds.
Innovation Solution
A circuit and method for switching charging modes are introduced, incorporating a switch circuit and controllers to connect the mobile terminal with either a conventional or quick-charging adapter, allowing for higher charging currents by establishing the appropriate electrical connections based on adapter detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional MICRO USB interface and single charging circuit are used, then device compatibility is maintained, but charging speed is slow and charging time is excessive
Solution Approach 1:
The charging system is segmented into multiple independent charging circuits (first charging circuit and second charging circuit) that can operate separately or simultaneously. The switch circuit divides the charging path into different routes, allowing the device to select between conventional charging (through first charging circuit) and quick charging (through second charging circuit), thereby increasing charging speed without compromising compatibility
Solution Approach 2:
The charging system dynamically switches between different charging modes based on detected adapter type. The switch circuit responds to control signals that determine whether to connect the charging interface to the first charging circuit or second charging circuit, enabling adaptive charging speed adjustment - slow charging for conventional adapters, fast charging for quick-charging adapters
2Power
If a single charging circuit supporting less than 3 amperes is used, then circuit simplicity is maintained, but charging current is insufficient for fast charging requirements
Solution Approach 1:
The charging system is segmented into multiple independent charging circuits (first charging circuit and second charging circuit) that can operate separately or simultaneously. The switch circuit divides the charging path into different routes, allowing the device to select between conventional charging (through first charging circuit) and quick charging (through second charging circuit), thereby increasing charging speed without compromising compatibility
Solution Approach 2:
The charging interface and switch circuit are designed to support multiple functions - they can handle both conventional charging currents (less than 3 amperes) and quick charging currents (higher than 3 amperes) through the same physical interface. The switch circuit and controllers work together to provide universal compatibility with different adapter types while enabling high-power charging when needed
Data Source
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Figure 4
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, includes: a switch circuit (4), configured to connect the charging terminal and the cell terminal if a connection instruction is received from the first controlled terminal (403), such that the quick-charging adapter charges the cell; a switching module (3), configured to receive a switching instruction from the controlled terminal; a first controller (1), 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 (2), configured to send the charging instruction to the first controller (1) if an insertion of the quick-charging adapter is detected.