Power Save Mode Control Circuitry for Whiteboard
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Solution Overview
Problem
Existing power supply control devices for electronic devices, such as electronic whiteboards, fail to maintain a power save mode when a user intentionally sets it, as motion sensors may detect the user who initiated the transition, causing the device to revert to normal mode even if the user has left.
Innovation Solution
A power supply system with circuitry that controls mode transitions based on user input and sensor detection, allowing the power save mode to be maintained until a predetermined time has passed or a second condition is met, preventing premature release due to ongoing user presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If motion sensor is used to detect user presence for automatic mode switching, then the device can automatically wake up when user approaches, but the device cannot maintain power save mode when user intentionally sets it and then leaves
Solution Approach 1:
The system performs preliminary action by recording the user operation that requests power save mode transition before the mode switching occurs. This recorded operation is then used as a reference to determine whether to release the power save mode later, preventing the sensor detection from overriding the user's intentional power save request.
Solution Approach 2:
The control circuit acts as an intermediary between the motion sensor and the power supply mode. It introduces a decision-making layer that compares sensor detection results with recorded user operations, determining whether to actually switch modes based on both inputs rather than directly responding to sensor signals.
2Loss of energy
If power save mode is activated based on user operation, then energy consumption is reduced, but the mode may be prematurely cancelled when sensor detects user presence
Solution Approach 1:
The system records the user's power save request operation in advance, creating a reference that protects the power save mode from being prematurely cancelled. This preliminary recording ensures that subsequent sensor detections during the power save period do not automatically override the user's energy-saving intention.
3Speed
If sensor detection is prioritized for mode release, then the device responds quickly to new users, but it prevents user-initiated power save mode from being maintained
Solution Approach 1:
The control circuit serves as an intermediary that balances sensor detection responses with user operation history. It determines mode release by considering both the current sensor detection result and the recorded user operation, allowing the system to respond quickly to genuine new users while maintaining power save mode when it was intentionally requested.
Data Source
AI summary
A power supply system includes circuitry that controls transition of an operation mode of the information processing apparatus from a first mode to a second mode in response to reception of user operation for transitioning to the second mode, the second mode being a mode in which electric power supplied to the information processing apparatus is less than that of the first mode, determines whether to release the second mode based on a detection result of a sensor that detects presence of a human, to output a first determination result, determines whether a first condition relating to the user operation is satisfied, to output a second determination result, and determines, based on the second determination result indicating that the first condition is satisfied, whether to allow releasing of the second mode based on the first determination result indicating that no human is detected.