USB PD Signal-Level Control for Faster Imaging Device Startup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional imaging devices experience increased startup times due to power negotiation processes when using power accessories compatible with the USB PD standard, leading to inefficient power supply and prolonged device activation.
Innovation Solution
An electronic device and method that includes a communication unit to request power at a first voltage level based on the signal level of the communication line, setting the signal level to a second level when not requesting power, and maintaining the signal level after power-off to optimize power supply and reduce startup time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power negotiation is performed according to USB PD standard between power accessory and imaging device, then appropriate voltage can be supplied to the imaging device, but startup time is increased
Solution Approach 1:
The power accessory performs voltage supply preparation in advance by detecting the connection of the imaging device and proactively negotiating and establishing the appropriate voltage level before the imaging device requests power. This preliminary action eliminates the waiting time during startup while ensuring the correct voltage is supplied.
Solution Approach 2:
The system preemptively prevents the startup time delay by implementing a mechanism where the power accessory anticipates the imaging device's power needs and establishes the power supply parameters before the device actually needs them, counteracting the inherent negotiation delay of USB PD standard.
2Power
If power accessory supplies high power for multi-functionality, then power consumption requirements are met, but compatibility with conventional low power devices becomes problematic
Solution Approach 1:
The power accessory dynamically adjusts its power output based on the specific needs of the connected imaging device. By detecting device characteristics and power requirements, the system optimizes voltage and current supply in real-time, enabling high power delivery when needed while maintaining compatibility with low power devices through adaptive power management.
Solution Approach 2:
The system changes power supply parameters (voltage and current levels) based on the connected device's requirements. The power accessory can switch between different power delivery modes and parameter sets to match the specific imaging device attached, ensuring optimal performance for high-power multi-functional devices while maintaining safe operation for conventional low-power devices.
Data Source
AI summary
An electronic device includes a communication unit configured to perform communication via a communication line. At startup, if the communication line's signal level is at a first level, the communication unit requests power at a first voltage from a predetermined power-supplying accessory. If the signal level is at a second level, the unit does not request power at the first voltage. A setting unit is provided to set the communication line's signal level to the second level after the accessory has been requested to supply power at the first voltage. Additionally, a control unit maintains the signal level of the communication line after the electronic device powers off, ensuring that the signal level remains consistent even when the device is turned off.