Hibernate Mode via Hall Sensor for Quick Boot
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Solution Overview
Problem
Existing mobile device battery management systems fail to extend usage time per battery charge effectively during idle periods, as they either dim the display or reduce hard drive power, but not sufficiently to maintain device functionality for extended periods of non-use.
Innovation Solution
Implementing a hibernate mode that powers down the processor and PMIC while maintaining low power to a hall sensor and boot control circuit, allowing for quick boot-up when the device is reopened, thereby reducing power consumption during extended idle times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the device enters a deep power-down state to extend battery life, then usage time per charge is improved, but the boot-up time increases
Solution Approach 1:
The system segments power management into distinct modes (suspend, hibernate, halt) with different power consumption levels. The hall sensor and boot control circuit are kept in a separate low-power segment that remains active or quickly activatable, while main components are powered down. This segmentation allows the device to achieve deep power savings without requiring full system reboot.
Solution Approach 2:
The boot control circuit performs preliminary preparation by remaining in a low-power ready state or being quickly activatable, so that when power is needed, the boot sequence can start immediately without waiting for circuit initialization. This preliminary positioning of the boot circuit resolves the contradiction by preparing the system in advance for quick activation.
2Speed
If the device maintains full power to all components, then boot-up speed is improved, but battery consumption increases
Solution Approach 1:
Different power states are applied to different components based on their functional requirements. The hall sensor operates in a low-power state sufficient for its sensing function, while the boot control circuit is kept ready or quickly activatable. This local differentiation of power quality allows fast boot capability in critical components while saving battery in non-critical components.
Solution Approach 2:
Instead of maintaining full power to all components, the system applies partial power action only to essential components (hall sensor, boot control circuit) that enable quick boot-up. This partial action approach achieves sufficient boot speed while dramatically reducing overall battery consumption compared to full-power operation of all components.
3Duration of action of moving object
If the device dims the display or reduces hard drive power, then battery life is extended, but device functionality is reduced
Solution Approach 1:
The invention extracts the essential boot-enabling functions (hall sensor for cover detection, boot control circuit for power sequencing) from the main system and maintains them in a separate low-power state. This extraction allows the device to enter a deep power-down state that extends battery life while preserving the capability to quickly restore full functionality when needed, without the compromise of having functionality reduced during idle periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly extends the device's usage time per battery charge by reducing power usage during idle periods without increasing the time to awaken the device, allowing it to remain functional for twice as long as devices without this mode under similar conditions.
Implementation Method 1
the cover sensor may include a hall sensor that may detect closing of the cover and in response send an interrupt signal to a processor on the device
Data Source
AI summary
A control circuit configured to conserve battery in a mobile device is described. The control circuit upon receiving an input signal from an input sensor sends a suspend signal to the power management integrated circuit (PMIC), which may turn off power in the rest of device and keep the processor and PMIC powered on, thereby transitioning the mobile device into a suspend mode. After a predetermined period of time, the mobile device saves all processes running on the processor and registry content of the memory in a non-volatile memory on the device and shuts off the PMIC and the processor to transition into a hibernate mode. The input sensor and control circuit which receive power directly from the battery management can turn on the PMIC and the processor upon receiving an awake signal from the input sensor, thereby transitioning the device back to an awake mode.