Power Supply Control for USB Hibernation Power Management
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Solution Overview
Problem
Information processing apparatuses, such as laptops, experience unexpected increases in power consumption when external devices like USB storage are connected, even in low power consumption states like Modern Standby, which shortens battery life.
Innovation Solution
The apparatus includes a power supply unit, communication control unit, operating state detection unit, and power supply control unit to detect when the controller enters hibernation and stop power supply to connected external devices, resuming power when necessary, and continuing supply if a rechargeable device is connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is continuously supplied to external devices in low power consumption state, then data communication can be maintained, but power consumption increases unexpectedly
Solution Approach 1:
The power supply control unit periodically supplies power to the connection terminal in a predetermined cycle during hibernation state, instead of continuous power supply. This periodic power supply maintains the ability to detect and communicate with external devices while significantly reducing overall power consumption compared to continuous supply.
Solution Approach 2:
The system dynamically adjusts the power supply state based on the operating state of the controller. When the controller is in hibernation, power supply to external devices is automatically adjusted from continuous to periodic mode. This dynamic adaptation allows the system to maintain communication capability while optimizing power consumption according to actual operational needs.
2Use of energy by moving object
If power supply is stopped to connection terminal in hibernation, then power consumption is reduced, but data communication is interrupted
Solution Approach 1:
Instead of completely stopping power supply, the system implements periodic power supply where power is supplied to the connection terminal in a predetermined cycle during hibernation. This maintains the communication interface active at intervals, allowing data communication to be preserved while still achieving significant power consumption reduction compared to continuous supply.
Solution Approach 2:
The periodic power supply ensures that the useful action of data communication remains continuously available despite the hibernation state. By maintaining power supply at periodic intervals, the system ensures that communication functionality is never completely interrupted, thus preserving data communication availability while reducing power consumption.
3Duration of action of moving object
If power supply is stopped to connection terminal, then battery life is extended, but external device functionality is lost
Solution Approach 1:
The power supply control unit supplies power to the connection terminal in a predetermined cycle during hibernation state. This periodic power supply extends battery life by reducing overall power consumption compared to continuous supply, while still maintaining external device functionality at periodic intervals to ensure devices remain operational when needed.
Solution Approach 2:
The system dynamically adjusts power supply to the connection terminal based on the controller's operating state. During hibernation, power is supplied periodically rather than continuously, which extends battery life while preserving the adaptability and versatility of external device functionality. The dynamic adjustment ensures devices remain functional without requiring continuous power.
Data Source
AI summary
An information processing apparatus includes: a power supply unit that supplies power to a connection terminal for connection to an external device; a communication control unit that performs data communication with an external device connected to the connection terminal; an operating state detection unit that detects a signal indicating that a controller including at least the communication control unit has entered hibernation; and a power supply control unit that stops power supply to the connection terminal when the signal indicating that the controller has entered hibernation is detected by the operating state detection unit.