Single-Wire Fast Charging Handshake 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 utilizing a single-wire channel for communication, which reduces channel requirements, avoids occupying D+/D- channels, and enables compatibility with other charging protocols, allowing for simultaneous fast charging and USB2.0 data transmission by sending and receiving signals to determine supported charging protocols.
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 independent channels: the single-wire channel (using CC pin) is dedicated to charging protocol negotiation, while the D+/D- channels remain available for USB2.0 data transmission. This segmentation allows both fast charging and data transmission to occur simultaneously without channel conflict.
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 mediator for fast charging handshake and negotiation, the D+/D- channels are freed from charging communication duties and can be exclusively used for data transmission, resolving the channel conflict.
2Adaptability or versatility
If multiple charging protocols are supported, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent makes the single-wire channel (CC pin) universal for all fast charging protocol negotiations. Whether it's PD, SCP, or other fast charging protocols, they all use the same single-wire CC channel for communication. This multi-functional design allows the system to support multiple charging standards without adding separate communication channels for each protocol.
Data Source
Figure 1~2A
Figure 2B~3
Figure 4A~4B
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.