Reversible Charging Circuit for Short-Circuit-Safe Wearable Devices
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Solution Overview
Problem
Current charging methods for portable electronic devices, such as Bluetooth earphones and smart glasses, can lead to short circuits and potential fires due to reversed connections of charging interfaces, which reduces the service life and poses safety hazards.
Innovation Solution
An electronic system with a charging circuit and switching circuit that allows charging without distinguishing between positive and negative terminals, and enables communication without disassembly, using transistors and resistors to manage terminal connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional charging interfaces are used without terminal identification, then charging can be performed, but reversed connection causes short circuit and safety hazards
Solution Approach 1:
The patent inverts the traditional charging interface design by making both terminals universally chargeable without requiring identification of positive and negative terminals. The charging circuit is designed to adapt to either terminal being connected to either pole, effectively reversing the conventional approach where specific terminals must match specific poles.
Solution Approach 2:
The patent changes the electrical parameters of the charging circuit by using controllable switches (transistors) to dynamically adjust the connection state between charging terminals and battery terminals. This allows the circuit to adapt its configuration based on which terminal is connected, preventing short circuits while maintaining charging functionality.
2Reliability
If charging circuit is designed with terminal identification, then safety is improved, but device complexity increases
Solution Approach 1:
The charging circuit performs self-identification and self-protection by automatically detecting which terminal is connected and configuring the appropriate switches to prevent short circuits. The circuit serves itself by using the connection state to control the switch configuration, eliminating the need for external identification mechanisms.
Solution Approach 2:
The patent introduces controllable switches (transistors) as intermediary elements between the charging terminals and the battery. These switches act as mediators that can be dynamically controlled to either connect or disconnect specific pathways, preventing direct short circuits while allowing charging current to flow through the appropriate path.
3Reliability
If separate charging and communication interfaces are used, then function reliability is maintained, but device portability is reduced
Solution Approach 1:
The patent makes the charging interface universal by enabling it to perform both charging and communication functions. The same physical terminals used for charging can also be used for data communication, eliminating the need for separate dedicated communication ports and reducing overall device complexity.
Solution Approach 2:
The patent introduces dynamic switching capability to the interface, allowing it to change its function based on the connection state and control signals. The controllable switches enable the interface to dynamically transition between charging mode and communication mode, providing multi-functionality without requiring multiple static interfaces.
Data Source
AI summary
Provided are an electronic system and a method for controlling the same. The electronic system includes an electronic device at least including: a charging circuit having a first input terminal, a second input terminal, and a first output terminal, and including a first transistor, a second transistor, a third transistor, and a fourth transistor; a switching circuit including an input terminal connected to the first output terminal and an output terminal connected to a power supply of the electronic device and configured to connect or disconnect a connection path between the first output terminal and the power supply; and a communication device, which, in a communication mode, is connected to the first and second input terminals to communicate with the electronic device through the first and second input terminals. The implementation of the present disclosure is at least conducive to prolonging the service life of the electronic device.