Embedded Controller Adapter Wattage Detection and Power Switching
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Solution Overview
Problem
Information handling systems with higher power requirements may be damaged or improperly operate when accidentally coupled with lower wattage power adapters, leading to adapter overcurrent protection conditions, failure to power on, and unexpected shutdowns due to mechanical compatibility issues and power mismatches.
Innovation Solution
An embedded controller in the system detects the wattage of the power adapter and activates a signal to stop powering the system from the adapter, generating a low power warning, including a visual alert, to prevent damage and ensure safe operation by switching to the system's battery power if the adapter wattage is insufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the system accepts any power adapter for compatibility, then ease of operation is improved, but system reliability deteriorates due to power mismatches causing damage or improper operation
Solution Approach 1:
The embedded controller continuously monitors adapter power delivery capability through communication protocols (PSID signal) and compares it against system power requirements. When a mismatch is detected, the system provides feedback by activating warning indicators and adjusting power consumption to match adapter capabilities, thereby maintaining reliable operation while accepting various adapters.
Solution Approach 2:
The system dynamically adjusts its power consumption parameters based on the detected adapter capability. When a lower-wattage adapter is detected, the embedded controller modifies system power settings to operate within the adapter's safe delivery limits, preventing overcurrent conditions while maintaining functionality.
2Reliability
If the system implements strict power adapter verification, then system reliability is improved, but ease of operation deteriorates due to rejection of compatible adapters
Solution Approach 1:
The system performs partial verification by checking adapter identification signals and power delivery capabilities, but accepts adapters that meet minimum thresholds rather than requiring exact matches. This approach verifies sufficient power capability without imposing strict compatibility requirements, maintaining both reliability and ease of operation.
3Ease of operation
If the system allows lower wattage adapters to power on, then ease of operation is improved, but harmful factors increase due to adapter overcurrent protection conditions causing damage or improper operation
Solution Approach 1:
The embedded controller performs preliminary detection of adapter power capability before full system power-on. By identifying lower-wattage adapters in advance and preventing excessive power draw, the system eliminates overcurrent protection conditions and potential damage before they can occur, while still allowing the system to operate on the detected adapter.
Solution Approach 2:
The system prepares protective measures in advance by detecting adapter capabilities during initialization. When a lower-wattage adapter is detected, the embedded controller pre-configures power management settings and activates warning indicators before full operation begins, cushioning against potential harmful effects of power mismatch.
4Reliability
If the system provides real-time power adapter detection and warnings, then system reliability is improved, but device complexity increases due to additional detection circuits and control logic
Solution Approach 1:
The embedded controller performs multiple functions using existing system resources: it detects adapter identification signals, monitors power delivery capability, controls power management, and activates warning indicators all through a single integrated control unit. This multi-functionality reduces the need for separate dedicated circuits for each function.
Solution Approach 2:
The patent combines adapter detection, power monitoring, and system control functions into a single embedded controller architecture. By merging these functions that could have been separate circuits into one integrated unit, the system achieves reliable power verification without proportionally increasing overall device complexity.
Data Source
AI summary
A system, method, and computer-readable medium are disclosed for detecting when a lower power adapter is coupled with an information handling system having higher power requirements. More specifically, in certain embodiments, a circuit (such as an embedded controller (EC)) detects an adapter wattage when an adapter plug-in is detected. If a lower wattage power adapter is detected (e.g., a 45 W power adapter), the embedded controller activates a signal (e.g., an AC_DISABLE signal) to stop powering the information handling system from the adapter. In certain embodiments, the information handling system is powered from a battery associated with the information handling system when the power adapter power capacity does not satisfy the power requirements of the information handling system. In certain embodiments, the circuit substantially simultaneously generates a low power warning. In certain embodiments, the adapter wattage may be detected via an adapter identifier (e.g., power supply identifier (PSID) signal) which is provided via a bus such as a single line bus.