Charging Cable Messaging Using D+/D− Duplex Signaling
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Solution Overview
Problem
Existing fast charging protocols, such as USB PD and D+/D− channel communication, face limitations in data transmission efficiency and security, particularly in scenarios involving different port types and high charging powers.
Innovation Solution
A charging cable-based data transmission method that utilizes a third electronic device with both a positive and negative data signal line, allowing for duplex transmission and active message sending and receiving, thereby improving data transmission efficiency and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only a single data signal line (D−) is used for communication in existing fast charging protocols, then device complexity is reduced, but data transmission efficiency deteriorates due to inability to perform duplex transmission
Solution Approach 1:
The patent segments the data transmission function by assigning different communication directions to different signal lines: the D− line handles one direction while the D+ line handles the other direction, enabling simultaneous bidirectional communication without requiring a completely new cable structure
Solution Approach 2:
The existing D+ and D− signal lines, originally designed for single-direction communication in charging protocols, are made multi-functional by enabling each line to handle both sending and receiving operations, thus achieving duplex transmission using the same physical infrastructure
2Reliability
If only one electronic device actively sends messages while the other passively responds, then device complexity is minimized, but security deteriorates in abnormal scenarios where active reporting is needed
Solution Approach 1:
The communication mode is made dynamic by allowing either device to switch between active sending and passive receiving roles based on operational needs. The system can adaptively change which device initiates communication, enabling both normal charging operations and abnormal situation reporting without fixed role assignments
Solution Approach 2:
The patent implements feedback mechanisms where the second electronic device can actively send status information back to the first device, particularly in abnormal scenarios. This feedback loop enables the system to respond to charging status changes, faults, or unexpected conditions, improving overall system reliability and security
3Productivity
If waiting for peer end to complete message sending before transmitting is implemented, then device complexity is reduced, but data transmission efficiency deteriorates due to idle waiting time
Solution Approach 1:
The patent achieves continuous useful action by enabling both devices to transmit messages simultaneously on their respective dedicated signal lines. This eliminates idle waiting time where one device would otherwise be dormant, as both devices can continuously send and receive information in parallel without interfering with each other's transmission
Data Source
AI summary
This application discloses a charging cable-based data transmission method and an electronic device. A first electronic device is connected to a second electronic device through a third electronic device, and the third electronic device includes a first data signal line and a second data signal line. When the method is applied to the first electronic device, the first electronic device may detect a connection to the second electronic device; send a first message through a first pin, where the first pin is connected to the first data signal line; and receive a second message through a second pin, where the second pin is connected to the second data signal line, and the first message and the second message are used for charging setting of the first electronic device.