USB PD Power Negotiation for Connected Option Unit Supply
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Solution Overview
Problem
Existing electronic devices may fail to supply sufficient power to connected power consuming devices due to inadequate power negotiation protocols, particularly when additional power consuming units are attached, leading to insufficient power allocation.
Innovation Solution
The electronic device includes a controller that acquires the power requirements of connected power consuming devices and negotiates for additional power based on these conditions, ensuring adequate power supply through a USB PD standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the printer requests only the power needed for itself during power negotiation, then the power negotiation is simple and quick, but power required for connected option units cannot be supplied
Solution Approach 1:
The controller acquires power supply conditions from connected option units before initiating the power negotiation with the power supply device. This preliminary acquisition of power requirements ensures that when power is requested during negotiation, the full power needs including option units are already accounted for, resolving the contradiction between simple negotiation and comprehensive power supply.
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors power supply conditions from option units and adjusts the power negotiation accordingly. The power supply device receives feedback about actual power consumption patterns, allowing dynamic adjustment of power allocation to meet both the printer's and option units' power requirements.
2Power
If the printer receives second power after power negotiation, then the power supply standard is maintained, but power for connected option units may still not be supplied
Solution Approach 1:
The controller acquires power supply conditions from option units before the power negotiation concludes. By performing this acquisition in advance, the system ensures that the second power requested during negotiation already includes the power needed for option units, eliminating the reliability issue where option units might not receive sufficient power even after negotiation.
Solution Approach 2:
The controller acts as an intermediary between the power supply device and the option units. It mediates the power allocation by acquiring power conditions from option units and incorporating these requirements into the power negotiation, ensuring that power is allocated reliably to both the printer and connected devices.
3Power
If the controller acquires power supply conditions before power negotiation, then power for option units can be supplied, but the control process becomes more complex
Solution Approach 1:
The controller performs the power condition acquisition as a preliminary step before power negotiation. This structured approach, while adding some control complexity, ensures accurate power allocation by having all power requirements identified before the negotiation begins, resolving the contradiction between accurate power allocation and control simplicity.
Data Source
AI summary
An electronic device is configured to receive supply of power from a power supply device. The electronic device includes: a controller; and a connection interface configured to be connected to a power consuming device. The controller is configured to receive supply of first power from the power supply device in accordance with a standard related to supply of power through a communication cable, and then perform power negotiation for requesting the power supply device to supply second power different from the first power. Before requesting the power supply device to supply the second power in the power negotiation, the controller is configured to acquire a supply condition of power required by the power consuming device connected to the connection interface, and determine the second power based on the acquired supply condition.