Battery Management Unit Detects Removal in Off-State Systems
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Solution Overview
Problem
Existing information handling systems lack effective methods to detect battery removal while in an off state, which can lead to security risks and potential intrusions, as well as diagnostic challenges upon power-on.
Innovation Solution
The system employs a battery management unit (BMU) with a voltage regulator to detect voltage state transitions at the system present pin, creating a voltage indicator that is stored and read by a microcontroller to initiate preset actions, such as displaying warnings, increasing security measures, and authenticating the battery, thereby protecting the system's security and data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the information handling system is in an off state with no power, then power consumption is minimized, but the system cannot detect battery removal events
Solution Approach 1:
The power management is segmented into two independent parts: a main system that remains off to conserve power, and a dedicated detection circuit that remains active to monitor battery status. The detection circuit includes a voltage regulator and microcontroller that can operate independently from the main system, allowing battery removal detection without requiring the entire system to be powered on.
Solution Approach 2:
The detection circuit performs preliminary monitoring of the battery connection status even when the main system is off. By continuously monitoring the system present pin voltage state and detecting transitions, the system is prepared to identify battery removal events before the main system needs to operate, enabling immediate response when power is restored.
2Reliability
If a detection circuit remains powered to monitor battery status, then battery removal detection is enabled, but power consumption increases
Solution Approach 1:
The detection circuit operates in a periodic manner rather than continuously. The microcontroller enters low-power sleep modes between detection cycles, activating only when voltage transitions occur or at scheduled intervals. This periodic operation maintains detection capability while significantly reducing average power consumption compared to continuous monitoring.
Solution Approach 2:
The detection circuit is designed to be self-powered through the battery's voltage regulator, which provides power to the detection components without requiring additional power from the main system. The circuit monitors its own power source's health and can detect when the battery is removed or replaced, enabling autonomous operation with minimal external power requirements.
3Measurement precision
If the system monitors voltage transitions continuously, then detection accuracy is improved, but processing load increases
Solution Approach 1:
The complex processing of continuous voltage monitoring is extracted and performed only when necessary. Instead of continuously analyzing voltage levels, the system extracts and processes only the critical event - the voltage transition that indicates battery removal. This event-driven approach maintains high detection accuracy while minimizing processing complexity by ignoring periods when no events occur.
Solution Approach 2:
A voltage regulator acts as an intermediary between the battery and the detection circuit, conditioning the voltage signal and providing a stable reference for detection. The regulator's output voltage state serves as a simplified indicator that the microcontroller can easily interpret, reducing the complexity of voltage analysis while maintaining accurate detection of battery connection status changes.
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 solution effectively detects battery removal and recoupling, enhancing security and diagnostic capabilities, ensuring the system's integrity and user safety by implementing customized security processes and authenticating battery authenticity.
Implementation Method 1
detect voltage state transitions at a system present pin of the BMU
Data Source
AI summary
An information handling system may include a processor; a battery to supply power to the information handling system, the battery comprising a voltage regulator to power a battery management unit (BMU) on the battery and set a system present pin of the BMU to a high voltage; the BMU to: detect a voltage indicator indicating a change in voltage state at a system present pin of the BMU that is externally connectable to a ground or voltage source at the information handling system, the voltage indicator indicative of an electrical coupling of the battery to the information handling system while the information handling system is in an off state; and register the voltage indicator within a battery register of the BMU; and a microcontroller, upon powering on of the information handling system, to read the voltage indicator at the battery register and determine that the battery has been coupled to the information handling system.