USB ID Line Power Negotiation for Fast Charging
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Solution Overview
Problem
The increasing power requirements of modern devices lead to longer charging times when using standard USB connections, as the limited power provided by USB ports cannot efficiently meet the demands of higher-capacity batteries, necessitating a solution to enhance power negotiation and delivery between devices.
Innovation Solution
The use of the identification (ID) line in USB cables enables inter-device communication, allowing devices to negotiate and adjust power characteristics, such as voltage and current levels, without interfering with existing data lines, enabling efficient power management and reduced charging times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If standard USB connections are used to charge devices, then power delivery is limited, but charging time increases
Solution Approach 1:
The patent implements dynamic power negotiation between devices using the ID line for communication. Devices can dynamically adjust voltage and current levels based on their power requirements and the capabilities of the power source, transitioning from static power delivery to adaptive power management that optimizes charging speed without exceeding safety limits
Solution Approach 2:
The system changes power delivery parameters (voltage and current) dynamically during the charging process. By modifying these parameters through negotiation protocols over the ID line, the system can deliver higher power levels when needed while maintaining compatibility and safety, thereby reducing charging time without compromising device protection
2Power
If power requirements of USB devices are increased, then device performance improves, but charge time increases
Solution Approach 1:
The patent establishes a feedback mechanism where devices communicate their power requirements and charging status through the ID line. The power delivery device receives feedback about the connected device's needs and adjusts power output accordingly, creating a closed-loop system that optimizes charging speed based on real-time conditions rather than using fixed power levels
Solution Approach 2:
The system dynamically adapts power delivery to match actual device requirements. Instead of providing fixed power levels, the system continuously adjusts voltage and current based on negotiated parameters, allowing high-power devices to charge faster while maintaining compatibility with lower-power devices, thus resolving the contradiction between power requirements and charging time
3Adaptability or versatility
If existing data lines (D+, D−) are used for communication, then data transfer is enabled, but power negotiation capability is limited
Solution Approach 1:
The patent makes the ID line a multi-functional component that serves both as an identification signal carrier and as a communication channel for power negotiation. By repurposing the ID line for bidirectional communication about power characteristics, the system achieves universal functionality without adding separate dedicated communication wires, thus improving adaptability while controlling complexity
Solution Approach 2:
The ID line acts as an intermediary communication channel between the power delivery device and the powered device. Instead of requiring complex multi-line communication interfaces, the system uses the ID line as a mediator to transmit power negotiation data, simplifying the overall interface while enabling sophisticated power management through the existing connector
Data Source
AI summary
In one example a method includes communicating, by a first device, with a second device via an identification (ID) line of a universal serial bus (USB) cable. A first connector of the USB cable may be attached to a USB connector of the first device. A second connector of the USB cable may be attached to a USB connector of the second device. The USB connector of the first device may include a bus voltage (VBUS) connector configured to mate with a VBUS line of the USB cable, a positive data (D+) connector configured to mate with a D+ line of the USB cable, a negative data (D−) connector configured to mate with a D− line of the USB cable, the ID connector configured to mate with a ID line of the USB cable, and a ground (GND) connector configured to mate with a GND line of the USB cable.