Single-Wire Fast Charging Protocol for USB2.0 Data Compatibility
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Solution Overview
Problem
Existing fast charging protocols based on D+/D− channel communication are not compatible with USB2.0 data transmission, affecting user experience by occupying necessary channels and limiting simultaneous fast charging and data transfer capabilities.
Innovation Solution
A charging method and apparatus utilizing a single-wire channel for communication, allowing for the reduction of required channels and enabling compatibility with other charging protocols, thereby facilitating simultaneous fast charging and USB2.0 data transmission through a target charging protocol based on single-wire channel communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast charging protocols based on D+/D− channel communication are used, then charging speed is improved, but USB2.0 data transmission capability is lost
Solution Approach 1:
The patent segments the communication function into two separate channels: the single-wire channel (using CC pin) is dedicated to charging protocol communication, while the D+/D− channels are reserved for USB2.0 data transmission. This segmentation allows both fast charging and data transmission to occur simultaneously without interference, resolving the contradiction between charging speed and data transmission capability.
Solution Approach 2:
The patent introduces the CC (Configuration) channel as an intermediary for charging protocol communication. By using the CC pin as a dedicated single-wire communication channel, the system enables fast charging negotiation without occupying the D+/D− data channels, thus preserving USB2.0 data transmission capability while achieving fast charging.
2Productivity
If D+/D− channels are occupied for charging communication, then charging efficiency is improved, but channel availability for other functions is reduced
Solution Approach 1:
The patent makes the CC channel multi-functional by using it for both USB Type-C connection identification and fast charging protocol communication. This universal usage of the CC channel eliminates the need to dedicate separate channels for charging communication, freeing up D+/D− channels for their original data transmission function while maintaining fast charging capability.
3Adaptability or versatility
If multiple charging protocols are supported, then compatibility is improved, but communication channel requirements increase
Solution Approach 1:
The patent creates a simplified copy of communication functionality using only the single-wire CC channel. By implementing a complete charging protocol communication system over a single wire rather than requiring multiple channels, the patent enables support for multiple charging protocols (such as QC, FP, SCP) without increasing channel requirements, as all protocol negotiations occur over the same single-wire interface.
Data Source
AI summary
A charging method applied to a power supply device is provided. The charging method includes: sending a first signal to a device to be charged through a single-wire channel in response to determining that a power supply device is connected with the device to be charged, the first signal being configured to represent a target charging protocol supported by the power supply device; receiving a second signal sent by the device to be charged through the single-wire channel, the second signal being a signal that the device to be charged responds to the first signal when it is determined to support the target charging protocol; and determining that the device to be charged supports the target charging protocol in response to receiving the second signal, and charging the device to be charged based on the target charging protocol.