Embedded Controller Lid Detection Prevents Power Supply Reset Damage
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Solution Overview
Problem
Information handling systems face unexpected initialization of components when the power supply is reset during maintenance, potentially leading to damage due to unintended component activation.
Innovation Solution
An embedded controller (EC) in the information handling system determines if the power supply reset was caused by removal for maintenance and if the lid is closed, causing components to remain in an inoperable state until the lid is opened, thereby preventing accidental initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the power supply is reset during maintenance, then the system can be serviced, but components may unexpectedly initialize and cause damage
Solution Approach 1:
The EC detects the lid closure state before allowing normal system initialization after power reset. By checking the lid position sensor signal prior to component activation, the system preliminarily determines whether to permit initialization, preventing accidental component activation during maintenance while enabling normal operation when the lid is properly closed.
Solution Approach 2:
The EC acts as an intermediary between the power supply reset event and the component initialization process. It intercepts the initialization signal from the PCH, evaluates the lid position condition, and selectively blocks or permits the transition to operable state, thereby mediating between power restoration and safe component activation.
2Reliability
If the EC checks lid position to prevent initialization, then component safety is improved, but system complexity increases
Solution Approach 1:
The EC utilizes existing system resources - the lid position sensor already present in the information handling system - to determine whether initialization should be permitted. The sensor signal is already available to the EC for other functions, and this patent repurposes it for safety determination, avoiding the need for additional dedicated sensors or complex external monitoring systems.
3Reliability
If components remain in inoperable state during maintenance, then damage is prevented, but system productivity decreases
Solution Approach 1:
The system dynamically adjusts its initialization behavior based on real-time lid position detection. When the lid is open (maintenance mode), the EC blocks initialization signals, keeping components inoperable. When the lid is closed (normal operation mode), the EC permits initialization. This dynamic response allows the system to adapt its operational state to the current usage context, balancing protection and productivity.
Data Source
AI summary
In one embodiment, a method for preventing an operable state in a plurality of components of an information handling system in response to a reset of a power supply includes: receiving, by an embedded controller of the information handling system, power from the power supply after the reset of the power supply; causing a platform controller hub of the information handling system to receive the power from the power supply; receiving a signal from the platform controller hub indicating that the plurality of components should be placed in the operable state from an inoperable state; determining that the reset of the power supply was caused by the power supply being previously removed from the information handling system; determining that a position of a lid of the information handling system is in a closed position; and causing the plurality of components to remain in the inoperable state.