Charging Cable Data Signaling for Faster Secure Fast Charging
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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 to improve data transmission efficiency and security by allowing messages to be sent and received on different data signal lines, enabling active reporting, and reducing handshake time for fast charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only D− data signal line is used for message sending and receiving, then device complexity is reduced, but data transmission efficiency deteriorates
Solution Approach 1:
The patent divides the data transmission function into two independent channels: D+ line for sending messages and D− line for receiving messages. This segmentation allows simultaneous bidirectional communication, eliminating the need to wait for peer end to complete sending before receiving, thereby improving data transmission efficiency while maintaining simple device implementation
Solution Approach 2:
The patent transitions from single-dimensional sequential communication (one line used alternately for sending and receiving) to two-dimensional parallel communication (separate lines for sending and receiving simultaneously). This dimensional change enables full-duplex data transmission over the same physical medium, resolving the contradiction between simplicity and efficiency
2Device complexity
If only active sending by first electronic device is used, then device complexity is reduced, but charging system security deteriorates
Solution Approach 1:
The patent implements active reporting mechanism where the second electronic device (to-be-charged device) can proactively send abnormal status messages to the first electronic device (power supply device) without waiting for polling. This preliminary action on abnormal conditions enables timely response to charging issues, improving system security while maintaining simple protocol structure through event-driven communication
Solution Approach 2:
The patent establishes bidirectional feedback channels: the first electronic device can send charging instructions to the second, and the second can actively report abnormal status back to the first. This feedback mechanism ensures both devices have awareness of system state, enhancing charging system security without significantly increasing protocol complexity
3Device complexity
If conventional handshake protocol is used, then device complexity is reduced, but charging speed deteriorates
Solution Approach 1:
The patent performs capability advertisement in advance during device connection, where each device declares its fast charging capabilities before actual charging begins. This preliminary action eliminates the need for lengthy handshake negotiations during charging initiation, enabling faster entry into fast charging mode while keeping the protocol structure simple through pre-negotiation
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 to set charging of the first electronic device.