Smart Power Adapter Control Circuitry for Graceful Shutdown
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Solution Overview
Problem
Ultra-small form factor electronic devices lack sufficient internal power sources to support normal operation, leading to data loss and ungraceful shutdowns when external power is disconnected, as they cannot transition to low power modes quickly enough due to limited battery capacity.
Innovation Solution
Incorporating control circuitry that receives sensor inputs to anticipate potential power disconnects, allowing the device to transition to low power or pre-shutdown modes before external power is lost, using a combination of external and internal power sources to manage power consumption effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If ultra-small form factor electronic devices use limited internal battery capacity, then device size is reduced, but the device cannot support normal operation when external power is disconnected
Solution Approach 1:
The system performs preliminary actions by detecting potential power disconnect events through sensor inputs (such as cable movement sensors, power quality monitors) before the actual disconnect occurs. This allows the device to proactively transition from normal mode to low power mode or pre-shutdown mode, preserving data and ensuring graceful shutdown. The control circuitry initiates power management actions in advance, rather than reacting after power is lost.
Solution Approach 2:
The power management system dynamically adjusts operational modes based on real-time conditions. The control circuitry continuously monitors sensor inputs and dynamically transitions between normal mode, low power mode, and pre-shutdown mode. This dynamic adaptation allows the device to optimize between performance and power conservation, enabling graceful shutdown behavior even with limited battery capacity.
2Reliability
If the device transitions to low power mode quickly upon power disconnect, then data loss is prevented, but the device requires complex control circuitry and sensors to detect power events
Solution Approach 1:
By detecting potential disconnect events in advance through sensors (cable movement, power quality degradation), the system has sufficient time to initiate data preservation actions and mode transitions without requiring overly complex real-time response mechanisms. The preliminary detection buffer simplifies the control logic needed for reliable data protection.
Solution Approach 2:
The control circuitry implements feedback mechanisms by continuously monitoring sensor inputs (power status, cable integrity signals) and adjusting operational mode accordingly. This feedback loop enables the system to respond appropriately to power events while maintaining manageable complexity through standardized control algorithms that process sensor data and trigger predefined power management actions.
3Power
If the device uses external power source, then normal operation is supported, but the device cannot operate independently when external power is unavailable
Solution Approach 1:
The system prepares for independent operation by detecting potential external power failures in advance and initiating transitions to low power mode that can be sustained by internal battery. This preliminary preparation ensures the device can maintain critical operations independently when external power becomes unavailable, enhancing adaptability without sacrificing normal operation capabilities when external power is present.
Solution Approach 2:
The power management system is designed to universally handle multiple power scenarios: external power only, internal battery only, and transitions between them. The control circuitry and sensor system provide multi-functional capability by detecting various power conditions and appropriately managing operational modes, enabling the device to adapt to different power availability situations and operate independently when necessary.
Data Source
AI summary
Disclosed are electrical systems and electronic devices. An electrical system includes an electronic device. The electronic device is configured to receive external power from an external power source, the external power sufficient to support normal mode operation of the electronic device. The electronic device includes control circuitry programmed to operate in the normal mode while receiving external power, and transition to one of a low power mode and a pre-shutdown mode responsive to sensor inputs. An electronic device includes an internal power source configured to provide internal power sufficient to support low power requirements of the electronic device operating in a low power mode, but not sufficient to support normal power requirements of a normal mode. The electronic device includes control circuitry programmed to transition from the low power mode to a hibernate mode while powered by only the internal power source.