USB-PD DRP Port State Fixation During Power Off
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Solution Overview
Problem
Existing electronic devices compatible with USB-PD do not allow users to select or maintain their desired power state during power off, limiting user control over power supply and reception.
Innovation Solution
An electronic device with circuitry that accepts user input to switch between power supply and reception states and fixes the selected state during power off, using a USB-PD compliant configuration with a DRP port and cc terminal management to ensure the device remains in the user's desired state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electronic device automatically determines power state without user input, then the operation is simplified, but the user cannot maintain their desired power state during power off
Solution Approach 1:
The device performs preliminary action by storing the user's selected power state (source or sink) in memory before power off occurs. This ensures that when the device is powered on again, it can restore the previously selected state, maintaining user preference across power cycles.
Solution Approach 2:
The device implements feedback by detecting the current power state, comparing it with the user's selection, and automatically adjusting or restoring the state accordingly. This closed-loop mechanism ensures the device maintains the desired state while allowing user control.
2Adaptability or versatility
If the device allows user selection of power state, then user control is improved, but the device complexity increases due to state management requirements
Solution Approach 1:
The device segments the power state management into distinct components: a selection unit for user input, a storage unit for saving state preferences, and a restoration unit for recovering states after power off. This modular approach reduces overall complexity by dividing the management function into manageable, independent modules.
Solution Approach 2:
The device performs self-service by automatically managing the power state transitions and restorations without requiring external intervention. The system autonomously detects power off events, retrieves stored preferences, and restores appropriate states, reducing the burden on users while maintaining adaptability.
3Productivity
If the device restores power state after power on, then functionality is improved, but additional processing time is required during startup
Solution Approach 1:
The device performs preliminary action by pre-storing power state preferences in non-volatile memory before power off. This allows the restoration process during startup to be faster, as the data is already prepared and does not require complex real-time determination, thus minimizing startup time loss.
4Stability of the object's composition
If the device maintains selected state during power off, then user preference is preserved, but the system requires additional memory and control logic
Solution Approach 1:
The device extracts only the essential power state information (source or sink selection) from the full system state and stores it separately in dedicated memory. This selective extraction approach maintains stability of the power state while minimizing the additional memory and control logic required, as only critical state data is preserved rather than the entire system state.
Data Source
AI summary
An electronic device electrically connectable to an external device includes: circuitry configured to: accept, from a user, a selection of one of: a first state that enables the electronic device to supply electric power to the external device; and a second state that enables the electronic device to receive electric power from the external device; and switch a state of the electronic device to the selected one of the first state and the second state and fix the selected one of the first state and the second state as the state of the electronic device in response to power off of the electronic device.